Propulsion device for ship

Abstract

The present invention provides a propulsion device for a ship, the propulsion device including: a shaft unit including a first shaft having a contra-rotating propeller disposed therein and including a hollow portion and a second shaft disposed in the hollow portion; a driving unit for rotating the shaft unit; and a buffer unit provided in the shaft unit to buffer axial vibration of the shaft unit.

Description

Marine propulsion system

[0001] The present invention relates to a propulsion device for a ship.

[0002] Environmental issues are a major global concern. Accordingly, ship-related technologies are also being developed with environmental considerations in mind. Conventional ships are powered by internal combustion engines that burn fossil fuels. Internal combustion engines generate power by burning fossil fuels. Consequently, the combustion of fossil fuels has resulted in the generation of large quantities of greenhouse gases as well as air pollutants.

[0003] Accordingly, ship propulsion systems utilizing electric motors, rather than internal combustion engines, are being developed. The propulsion system's rotational shaft can be directly connected to the motor's rotor. The motor's rotor is designed to move axially within a predetermined range to ensure smooth rotation. Consequently, there has been a problem with the axial vibration of the rotational shaft during the process of generating thrust through the rotation of the propeller.

[0004] Meanwhile, with the advancement of ship propulsion systems, various propeller structures and technologies are being studied to provide efficient propulsion. Among these, the contra-rotating propeller (CRP) system is a method for improving fuel efficiency and propulsion power.

[0005] The contra-rotating propeller system generates thrust by rotating two propellers in opposite directions, providing higher propulsive efficiency than a single propeller system, which can reduce fuel consumption.

[0006] The counter-rotating propeller system maximizes propulsion efficiency by counteracting the rotational flows generated when the propellers rotate. Since the rotational motion generated by one propeller is counteracted by the other, the result is improved forward propulsion of the vessel.

[0007] This type of counter-rotating propeller system is advantageous for ships requiring high-speed operation or large cargo ships, and is also being applied to passenger ships because it can reduce noise and vibration compared to existing ship propulsion systems.

[0008] However, the counter-rotating propeller system is structurally complex, requiring independent control of the two propellers and each rotational axis. In particular, proper power transmission and precise control of the rotational motion between the propeller and the propulsion shaft are essential, and various studies are currently underway in this regard.

[0009] In order to solve at least some of the above problems, the present invention provides a propulsion device capable of reducing vibration of a shaft portion of a ship propulsion device in the axial direction.

[0010] In addition, a ship propulsion device and a method for installing a ship propulsion device are provided, which can increase cargo loading space in a ship by reducing the overall length of a shaft system for generating propulsion force in the ship propulsion device.

[0011] In addition, a thrust support section surrounds a first drive shaft section and a second drive shaft section, and simultaneously supports thrust generated from a front propeller section and a rear propeller section, thereby reducing the overall length of a shaft system for generating propulsion force in a ship propulsion device, thereby providing a ship propulsion device capable of increasing cargo loading space in the ship.

[0012] In addition, the drive housing is formed as a single unit and accommodates a first drive body part and a second drive body part, thereby simplifying the structure of the drive body that transmits power to the front propeller part and the rear propeller part, reducing the overall size of the drive body, and reducing the length of the entire shaft system that transmits power, thereby providing a ship propulsion device.

[0013] In addition, the present invention provides a ship propulsion device and a ship including the same, which can increase cargo loading space in a ship by reducing the overall length of a shaft system for generating propulsion force in the propulsion device by having a second shaft pass through the first drive unit and connected to the second drive unit.

[0014] In addition, a ship propulsion device is provided that includes a drive shaft support device that can prevent damage to the bearing unit during installation of the bearing unit and stably position the bearing unit.

[0015] In addition, the present invention provides a bearing device and a method for installing the same, which are provided in a ship propulsion device, and which can be stably installed in a preset position on a shaft connected to a ship propeller by adjusting the width of the overlapping area with the bearing body by transmitting an external force to a snap portion connected to the bearing body.

[0016] The purpose of the present invention is not limited to the purposes mentioned above, and other purposes not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0017] According to one embodiment of the present invention for achieving the above object, a propulsion device for a ship may include a shaft portion including a first shaft having a hollow portion and a second shaft disposed in the hollow portion, in which a counter-rotating propeller is arranged; a driving portion for rotating the shaft portion; and a buffer portion provided in the shaft portion for buffering axial vibration of the shaft portion.

[0018] In addition, the buffer unit may include a second shaft protrusion provided on the second shaft; a first shaft protrusion provided on the first shaft and arranged to surround the second shaft protrusion; and a housing arranged to surround the first shaft protrusion.

[0019] In addition, the buffer portion further includes oil that flows by axial movement of the shaft portion, and the oil can flow in a direction opposite to the axial movement direction of the shaft portion.

[0020] In addition, the buffer portion includes a first spacer arranged along the outer circumference of the second shaft protrusion; and a second spacer arranged along the outer circumference of the first shaft protrusion; wherein the first spacer and the inner circumference of the first shaft protrusion are spaced apart from each other, and the second spacer and the inner circumference of the housing can be spaced apart from each other.

[0021] In addition, it may include a first friction pad disposed on one side and the other side of the second shaft protrusion; and a second friction pad disposed on one side and the other side of the first shaft protrusion.

[0022] In addition, a plurality of grooves through which oil flows are arranged on the surfaces of the first friction pad and the second friction pad, and the plurality of grooves can be arranged radially along the surface of the first friction pad or the second friction pad.

[0023] According to another embodiment of the present invention for achieving the above object, a propulsion device for a ship comprises: a propeller unit including a counter-rotating propeller; a shaft unit forming a rotational center axis of the counter-rotating propeller; a drive unit generating power; and a thrust support unit connected to the propeller unit and the drive unit and transmitting thrust generated from the propeller unit to a hull; wherein one end of the shaft unit can be disposed inside the thrust support unit.

[0024] Additionally, the driving unit can generate power by means of an electric motor.

[0025] Additionally, the counter-rotating propeller may include a front propeller; and a rear propeller disposed relatively rearward of the front propeller and capable of rotating in the opposite direction to the front propeller.

[0026] Additionally, the shaft portion may include a first shaft forming a rotation axis of the front propeller; and a second shaft forming a rotation axis of the rear propeller.

[0027] In addition, the thrust support unit may include a connecting shaft unit connecting the shaft unit and the driving unit; a supporting housing unit that surrounds the shaft unit and the connecting shaft unit and is disposed on the hull; and a supporting unit that surrounds the shaft unit and is disposed inside the supporting housing unit and supports a load in the axial direction of the shaft unit.

[0028] In addition, the support unit may be provided in multiple numbers and may be spaced apart from each other along the longitudinal central axis of the shaft portion and the connecting shaft portion.

[0029] Additionally, the support unit may be formed in a ring shape.

[0030] In addition, the driving unit may include a first driving body that generates a rotational force in a first direction; and a second driving body that generates a rotational force in a second direction opposite to the first direction.

[0031] In addition, the driving unit may further include a driving housing unit that accommodates the first driving body and the second driving body together.

[0032] In addition, the driving unit includes a first driving housing that accommodates the first driving body; and

[0033] It may include a second driving housing that is spaced apart from the first driving housing and accommodates the second driving body.

[0034] According to another embodiment of the present invention for achieving the above object, a method for installing a propulsion device for a ship includes the steps of: inserting one side of a propeller section having a counter-rotating propeller into a hull; connecting a thrust support section for transmitting thrust generated from the propeller section to the hull; and connecting a driving section for generating power to the thrust support section; wherein one end of the propeller section inserted into the hull can be arranged inside the thrust support section.

[0035] In addition, the method may further include a step of supporting a preset section of the propeller section inside the hull.

[0036] In addition, the step of supporting the thrust support member may be further included.

[0037] In addition, the step of connecting the thrust support unit to the propeller unit may include the steps of: arranging a support unit on the propeller unit; connecting a connecting shaft unit to the propeller unit along the rotational center axis of the propeller unit; and arranging one end of the propeller unit and the connecting shaft unit with a support housing unit and placing it on the hull.

[0038] Additionally, the step of connecting the thrust support member to the propeller member may further include a step of adjusting the height of the thrust support member.

[0039] According to another embodiment of the present invention for achieving the above object, a propulsion device for a ship may include: a front propeller section having a front propeller having a first shaft as a rotation axis; a rear propeller section having a rear propeller having a second shaft as a rotation axis and positioned rearward of the front propeller; a first drive shaft section transmitting power to the first shaft; a second drive shaft section transmitting power to the second shaft so as to rotate in an opposite direction to the first shaft; and a drive section generating power; and a thrust support section surrounding the first drive shaft section and the second drive shaft section, and simultaneously supporting thrust generated from the front propeller section and the rear propeller section and transmitting the thrust to a hull.

[0040] In addition, the thrust support unit may include a support housing unit that surrounds the first drive shaft unit and the second drive shaft unit and is disposed on the hull; and a support unit that is disposed on the inside of the support housing unit so as to be in contact with the first drive shaft unit and the second drive shaft unit and supports an axial load of the first drive shaft unit and the second drive shaft unit.

[0041] In addition, a plurality of the support units are provided, and the plurality of the support units can be spaced apart from each other along the longitudinal central axis of the first drive shaft portion and the second drive shaft portion.

[0042] Additionally, the support unit may include a plurality of support unit bodies that can be fastened to each other.

[0043] In addition, the driving unit may include a first driving housing that accommodates the first driving shaft unit; and a second driving housing that is spaced apart from the first driving housing and accommodates the second driving shaft unit.

[0044] Additionally, the thrust support member may be arranged between the first drive housing and the second drive housing.

[0045] Additionally, the second drive shaft portion can be connected to the second shaft by passing through the first drive housing.

[0046] Additionally, one side of the thrust support member can be fixed to the hull.

[0047] Additionally, one end of the first drive shaft portion facing the second drive housing and a preset area of ​​the second drive shaft portion may be placed inside the thrust support portion.

[0048] Additionally, the driving unit can generate power by means of an electric motor.

[0049] According to another embodiment of the present invention for achieving the above object, a propulsion device for a ship comprises: a front propeller section having a front propeller having a first shaft as a rotation axis; a rear propeller section having a rear propeller having a second shaft as a rotation axis and positioned rearward of the front propeller; and a drive section including a first drive body section transmitting power to the first shaft; a second drive body section transmitting power to the second shaft; and a drive housing having a hollow interior and positioned and fixed to a hull; wherein the drive housing is formed as a single unit and can accommodate the first drive body section and the second drive body section.

[0050] In addition, the first driving body part may include a first driving shaft part that transmits power to the first shaft, and the second driving body part may include a second driving shaft part that transmits power to the second shaft.

[0051] In addition, the first driving body part may include a first driving body that generates a rotational force in a first direction and is connected to the first driving shaft part; and the second driving body part may include a second driving body that generates a rotational force in a second direction opposite to the first direction and is connected to the second driving shaft part.

[0052] In addition, the first drive shaft portion may include a first connecting member connected to the first shaft; and a first drive shaft connecting the first connecting member and the first drive body.

[0053] Additionally, in the second paragraph, the second drive shaft portion may include a second connecting member connected to the second shaft; and a second drive shaft connecting the second connecting member and the second drive body.

[0054] In addition, the invention may further include a thrust support unit coupled to at least one of the first drive body unit and the second drive body unit, and supporting thrust generated from the front propeller unit and the rear propeller unit and transmitting the thrust to the hull.

[0055] Additionally, the thrust support unit may be arranged between the second driving body unit and the driving housing.

[0056] In addition, the thrust support member is provided in multiple numbers and can be connected to the first driving body part and the second driving body part, respectively.

[0057] Additionally, the driving unit can generate power by means of an electric motor.

[0058] According to another embodiment of the present invention for achieving the above purpose, a ship may include a ship propulsion device.

[0059] According to another embodiment of the present invention for achieving the above object, a propulsion device for a ship comprises: a front propeller section having a front propeller having a first shaft as a rotation axis; a rear propeller section having a rear propeller having a second shaft as a rotation axis and positioned rearward of the front propeller; a first drive section for rotating the front propeller section; and a second drive section for rotating the rear propeller section; wherein the second shaft can pass through the first drive section and be connected to the second drive section.

[0060] Additionally, the first driving unit and the second driving unit can generate power in the form of an electric motor.

[0061] In addition, the first driving unit may include a first driving body that generates power; and a first driving shaft unit that is connected to the first shaft and is rotatable by receiving power from the first driving body.

[0062] In addition, the first driving unit may further include a first driving housing that accommodates the first driving body and the first driving shaft unit and is disposed on the hull.

[0063] In addition, the first drive shaft portion may include a first connecting member connected to the first shaft; and a first drive shaft connecting the first connecting member and the first drive body.

[0064] In addition, a first extension portion is formed to extend radially from one end of the first drive shaft facing the first connecting member based on the rotational center axis of the first drive shaft, and the first extension portion and the first connecting member can be combined by making surface contact.

[0065] In addition, the second driving unit may include a second driving body that generates power; and a second driving shaft unit that is connected to the second shaft and is rotatable by receiving power from the second driving body.

[0066] In addition, the second drive shaft portion may include a second connecting member connected to the second shaft; and a second drive shaft connecting the second connecting member and the second drive body.

[0067] In addition, the second connecting member is hollow on the inside and is open on both sides based on the longitudinal central axis, and the second shaft and the second driving shaft can be inserted therein.

[0068] In addition, a second extension portion is formed to extend radially from one end of the second drive shaft facing the second connecting member based on the rotational center axis of the second drive shaft, and the second extension portion and the second connecting member can be combined while making surface contact.

[0069] Additionally, the first driving unit may include a first thrust support unit that supports thrust generated from the front propeller unit and transmits it to the second shaft.

[0070] Additionally, the second driving unit may include a second thrust support unit that supports the thrust generated from the rear propeller unit and transmits it to the hull.

[0071] In addition, it may include an axis support member disposed on the outer surface of the first shaft and disposed between the hull into which the first shaft is inserted and the first shaft.

[0072] In addition, the above-mentioned shaft support members are provided in multiple numbers and can be spaced apart from each other at a preset interval on the second shaft.

[0073] According to another embodiment of the present invention for achieving the above purpose, a vessel may include a hull; and a propulsion device installed on the hull.

[0074] According to another embodiment of the present invention for achieving the above object, a ship propulsion device includes a second shaft connected to a rear propeller, a hub of a front propeller into which the second shaft is inserted and connected to a first shaft, and a drive shaft support device installed in a gap between the second shaft and the hub, wherein the drive shaft support device may include a bearing unit coupled to the second shaft, a first bearing fixing part arranged between the bearing unit and the hub, and a second bearing fixing part arranged between the first bearing fixing part and the hub.

[0075] Additionally, the outer surface of the first bearing fixing part and the inner surface of the second bearing fixing part can be formed in a shape corresponding to each other.

[0076] Additionally, the first bearing fixing portion may include a first tapered portion having a constant inner diameter in the insertion direction and an enlarged outer diameter.

[0077] Additionally, the second bearing fixing portion may include a second tapered portion and a third tapered portion that are inclined in different directions in cross section.

[0078] Additionally, the second bearing fixing portion may be tapered so that the inner diameter thereof increases in the insertion direction in correspondence with the first bearing fixing portion.

[0079] Additionally, the second bearing fixing portion may be tapered so that its outer diameter is reduced in the insertion direction in correspondence with the inner surface of the hub.

[0080] Additionally, the inner surface of the first bearing fixing part can be in contact with the outer surface of the outer ring of the bearing, and the outer surface of the first bearing fixing part can be in contact with the inner surface of the second bearing fixing part.

[0081] Additionally, when the second bearing fixing part is installed, the second bearing fixing part can be guided along a path by the first bearing fixing part.

[0082] Additionally, the first bearing fixing part can be pressed by the second bearing fixing part to axially fix the bearing unit.

[0083] Additionally, the second bearing fixing portion may include an extension formed to extend radially from the rear end.

[0084] According to another embodiment of the present invention for achieving the above object, a bearing device provided in a ship propulsion device includes a bearing body having a shaft hole portion through which a shaft connected to a ship propeller can pass and supporting rotation of the shaft; and a snap portion connected to the bearing body and overlapping with the shaft hole portion; wherein the snap portion is formed of a material capable of elastic deformation, receives an external force to adjust the width of an overlapping area with the shaft hole portion, and can pressurize the shaft.

[0085] In addition, the snap part may include a snap body formed to extend and have a radius of curvature preset to surround the outer surface of the shaft passing through the shaft hole part; and a connecting part connecting the snap body and the bearing body.

[0086] In addition, the method may further include a movable part that is fastenable to the snap part and transmits power to the snap part to change the area of ​​overlap between the snap part and the shaft hole part.

[0087] In addition, the movable part includes a first movable body extending in the longitudinal direction and having a hollow interior; and a second movable body sharing a longitudinal central axis with the first movable body and insertable into the interior of the first movable body; and the first movable body and the second movable body can rotate relative to each other about the longitudinal central axis.

[0088] In addition, the snap body may have one side rotatably connected to the bearing body, and the other side opposite to the one side may be connected to the connecting portion.

[0089] Additionally, the connecting portion may have elastic restoring force in the direction from the bearing body toward the snap body.

[0090] In addition, the connecting portion is positionally fixed to the bearing body, and the snap body is formed of a material capable of elastic deformation and can be placed on the bearing body while surrounding the connecting portion.

[0091] According to another embodiment of the present invention for achieving the above object, a method for installing a bearing device provided in a ship propulsion device may further include a step of applying an external force to a snap portion connected to a bearing body having a shaft hole portion through which a shaft connected to a ship propeller can pass, thereby expanding an inner area of ​​the snap portion that can overlap with the shaft hole portion; a step of passing the shaft through the shaft hole portion and placing the bearing body and the snap portion on the shaft; and a step of removing the external force applied to the snap portion to reduce the inner area of ​​the snap portion.

[0092] Additionally, in the step of expanding the inner area of ​​the snap portion, the movable portion is fastened to the snap portion and an external force can be applied to the snap portion.

[0093] Additionally, in the step of reducing the inner area of ​​the snap portion, the movable portion can be separated from the snap portion.

[0094] The ship propulsion device according to the present invention can attenuate axial vibration of a rotating shaft.

[0095] The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the description below.

[0096] Figure 1 is a conceptual drawing of a ship to which a ship propulsion device according to the present invention is applied.

[0097] Figure 2 is a conceptual drawing illustrating a ship propulsion device according to the present invention.

[0098] Figure 3 is a perspective view showing a buffer part of a ship propulsion device according to the present invention.

[0099] Figure 4 is an exploded view of the buffer part of Figure 3.

[0100] Figure 5 is an exploded view of the buffer section based on the I-I' cross-section of Figure 3.

[0101] Figure 6 is a drawing illustrating a friction pad applied to a buffer portion according to the present invention.

[0102] Figure 7 is a drawing showing the neutral state of the shaft section of a ship propulsion device.

[0103] Figure 8 is a drawing showing the axial movement of the second shaft of a ship propulsion device.

[0104] Figure 9 is a drawing showing the axial movement of the first shaft of the ship propulsion device according to the present invention.

[0105] FIG. 10 is a schematic drawing of a vessel including a vessel propulsion device according to embodiments of the present invention.

[0106] Figure 11 is an enlarged view of part A of Figure 10.

[0107] Fig. 12 is an enlarged view of the thrust support member according to the present invention in Fig. 11.

[0108] FIGS. 13a to 13d are drawings illustrating a process of installing a thrust support member to a hull according to one embodiment of the present invention.

[0109] Figure 14 is a flowchart illustrating a method for installing a ship propulsion device according to one embodiment of the present invention.

[0110] Figure 15 is a flowchart illustrating the steps of connecting the thrust support member to the propeller member.

[0111] FIG. 16 is a drawing illustrating a propulsion device for a ship according to another embodiment of the present invention.

[0112] Figure 17 is an enlarged drawing of a thrust support unit of a ship propulsion device according to another embodiment of the present invention.

[0113] Figure 18 is an enlarged view of part A of Figure 10.

[0114] Figures 19 to 21 are drawings illustrating a process of installing a thrust support member according to one embodiment of the present invention.

[0115] Figure 22 is an enlarged view of part A of Figure 10.

[0116] Figure 23 is an enlarged view of part C of Figure 22.

[0117] FIG. 24 is a partial view of a ship propulsion device according to another embodiment of the present invention corresponding to FIG. 23.

[0118] FIG. 25 is a partial view of a ship propulsion device according to another embodiment of the present invention corresponding to FIG. 23.

[0119] Fig. 26 is an enlarged view of part A of Fig. 10 to which a propulsion device according to the present invention is applied.

[0120] Fig. 27 is a drawing showing another embodiment of the second connecting member in Fig. 26.

[0121] FIG. 28 is an enlarged view of part A of FIG. 10 to which a propulsion device according to another embodiment of the present invention is applied.

[0122] Fig. 29 is a drawing showing another embodiment of the second connecting member in Fig. 28.

[0123] Figure 30 is a conceptual drawing illustrating a ship propulsion device according to the present invention.

[0124] Figure 31 is an enlarged cross-sectional view of part D of Figure 30.

[0125] Fig. 32 is a cross-sectional view showing a part of the drive shaft support device of Fig. 30.

[0126] FIG. 33 is a cross-sectional view illustrating a portion of a drive shaft support device according to another embodiment of the present invention.

[0127] Figures 34 to 37 are cross-sectional views illustrating a step-by-step installation process of a drive shaft support device according to the present invention.

[0128] Figure 38 is an enlarged view of part A of Figure 10.

[0129] Figure 39 is a perspective view illustrating a bearing device according to the present invention.

[0130] Figure 40 is a drawing showing a state in which the bearing body, snap part, and movable part according to the present invention are separated.

[0131] Figure 41 is a partially enlarged drawing of an area where a snap part and a movable part are combined according to the present invention.

[0132] Figure 42 is a plan view showing a bearing body and a snap part adjusted on the bearing body according to the present invention.

[0133] Figures 43 and 44 are drawings showing a state in which an external force is transmitted by a movable part according to the present invention and a snap part is adjusted on a bearing body.

[0134] Figure 45 is a flowchart sequentially illustrating a method of installing a bearing device according to embodiments of the present invention.

[0135] Figure 46 is a drawing showing a state in which the bearing body, snap part, and movable part are separated according to another embodiment of the present invention.

[0136] Figure 47 is a partially enlarged view of an area where a snap part and a movable part are combined according to another embodiment of the present invention.

[0137] FIG. 48 is a plan view showing a bearing body and a snap part adjusted on the bearing body according to another embodiment of the present invention.

[0138] Figures 49 and 50 are drawings showing a state in which a snap part is adjusted on a bearing body by receiving an external force from a movable part according to another embodiment of the present invention.

[0139] FIG. 51 is a plan view showing a bearing body and a snap part adjusted on the bearing body according to another embodiment of the present invention.

[0140] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0141] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" includes any combination of multiple related items described herein or any one of multiple related items described herein.

[0142] The terms "~bu, ~part, ~section, etc." may be used to describe various components, but these components should not be limited by these terms. These terms may refer not only to physically / visibly distinct components, but also to the function or composition of a part even if the distinction / division is not clearly defined.

[0143] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0144] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0145] Although the terms first and second may be used to describe various components, these components are not limited in order, size, location, or importance by the terms first and second, etc., and are named only for the purpose of distinguishing one component from another.

[0146] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in more detail.

[0147]

[0148] First, a ship propulsion device according to the first embodiment of the present invention will be described in detail.

[0149]

[0150] Fig. 1 is a conceptual drawing of a ship to which a propulsion device according to the present invention is applied, and Fig. 2 is a conceptual drawing of a propulsion device according to the present invention.

[0151] A propulsion device according to the present invention will be described with reference to FIGS. 1 and 2.

[0152] The propulsion device (100) is arranged at the stern of the ship. The ship propulsion device (100) generates thrust through the rotation of the propeller, and the thrust enables the ship to move. The propulsion device (100) may be a counter-rotating propulsion device using a counter-rotating propeller. The counter-rotating propulsion device can improve propulsion efficiency by minimizing the loss of rotational energy through the superposition of wakes formed by the front and rear propellers that rotate in opposite directions.

[0153] The propulsion device (100) may include a driving unit (1100), a shaft unit (1200), and a propeller (1300).

[0154] The driving unit (1100) generates power for propulsion and may include a stator (1110) and a rotor (1120).

[0155] In the present invention, the driving unit (1100) generates power by means of an electric motor, but is not limited thereto, and various modifications such as an internal combustion engine or an engine are possible within the technical concept of being able to transmit power to the shaft unit (1200).

[0156] Below, a detailed description will be given on the assumption that the driving unit (1100) is an electric motor, specifically a counter-rotating motor.

[0157] Either the stator (1110) or the rotor (1120) may include a permanent magnet, and the other of the stator (1110) or the rotor (1120) may include a coil.

[0158] The driving unit (1100) according to the present invention may include two rotors (1120) and two stators (1110). That is, the driving unit (1100) may be a counter-rotating motor in which the rotation directions of the two rotors (1120) are different from each other.

[0159] The driving unit (1100) may include a first stator (1111) and a first rotor (1121). When current is supplied to the driving unit (1100), the first rotor (1121) may rotate through electromagnetic interaction between the first stator (1111) and the first rotor (1121).

[0160] The driving unit (1100) may include a second stator (1112) and a second rotor (1122). When current is supplied to the driving unit (1100), the second rotor (1122) may rotate due to the electromagnetic interaction between the second stator (1112) and the second rotor (1122). In this case, the rotational directions of the first rotor (1121) and the second rotor (1122) may be opposite to each other.

[0161] The shaft portion (1200) can be coupled with the driving portion (1100). The shaft portion (1200) can be coupled with the rotor (1120) of the driving portion (1100). That is, the shaft portion (1200) can rotate by the rotation of the rotor (1120).

[0162] The shaft portion (1200) may include a first shaft (1210) and a second shaft (1220). The first shaft (1210) corresponds to an outer shaft and may have a hollow interior. That is, the first shaft (1210) may have a structure with a hollow center.

[0163] A second shaft (1220) can be placed in the hollow of the first shaft (1210). That is, the second shaft (1220) corresponds to an inner shaft, and can be inserted into the hollow of the first shaft (1210) and rotate relative to the first shaft (1210).

[0164] Therefore, oil may be placed between the second shaft (1220) and the first shaft (1210) to ensure smooth rotation of the second shaft (1220).

[0165] The first shaft (1210) can be coupled with the first rotor (1121). Therefore, the first shaft (1210) can rotate through the rotation of the first rotor (1121). The second shaft (1220) can be coupled with the second rotor (1122).

[0166] Therefore, the second shaft (1220) can rotate through the rotation of the second rotor (1122). Since the first rotor (1121) and the second rotor (1122) rotate in opposite directions, the first shaft (1210) and the second shaft (1220) can also rotate in opposite directions.

[0167] A front propeller (1310) may be arranged on one side of the first shaft (1210). A rear propeller (1320) may be arranged on one side of the second shaft (1220), which is arranged relatively rearward (left in FIG. 2) of the front propeller (1310).

[0168] The front propeller (1310) and the rear propeller (1320) can be arranged in the forward and backward directions relative to each other. The front propeller (1310) and the rear propeller (1320) can be arranged on the first shaft (1210) and the second shaft (1220), respectively, and can rotate in opposite directions.

[0169] FIG. 3 is a perspective view showing a buffer part of a propulsion device according to the present invention, FIG. 4 is a drawing showing an exploded view of the buffer part, FIG. 5 is a drawing showing an exploded view of the buffer part based on the I-I' cross-section of FIG. 3, and FIG. 6 is a drawing showing a friction pad applied to the buffer part according to the present invention.

[0170] A buffer unit (1400) is arranged in the propulsion device (100). The shaft unit (1200) of the propulsion device (100) can move within a predetermined range along the longitudinal direction. Specifically, in order to prevent the rotor (1120) from being damaged by contact with a structure such as a case of the drive unit (1100) or a frame within the drive unit (1100) when the rotor (1120) rotates, the rotor (1120) is arranged so as to be able to move within a predetermined range in the direction of the rotation axis of the rotor (1120).

[0171] That is, there is a certain range of play between the case of the rotor (1120) and the driving unit (1100) that allows the rotor (1120) to move in the axial direction of the rotor (1120). The rotor (1120) is coupled to the shaft unit (1200), and the shaft unit (1200) is coupled to the propeller (1300).

[0172] When the propeller (1300) rotates, thrust is generated in the axial direction of the shaft portion (1200), so a force is applied to the shaft portion (1200) and the rotor (1120) in the axial direction of the shaft portion (1200).

[0173] If the axial movement of the shaft portion (1200) and the rotor (1120) is excessive, damage to the propulsion device, such as breakage between the case of the rotor (1120) and the drive portion (1100), may occur.

[0174] Accordingly, in the propulsion device (100) according to the present invention, a buffer unit (1400) is arranged to limit the axial movement of the shaft unit (1200) and reduce shock and vibration due to the axial movement of the shaft unit (1200).

[0175] The buffer portion (1400) may include a portion of the shaft portion (1200). The buffer portion (1400) may include a second shaft protrusion (1410) disposed on a second shaft (1220), a first shaft protrusion (1420) disposed on a first shaft (1210), and a housing (1450) disposed on the outermost portion of the buffer portion (1400).

[0176] Additionally, the buffer unit (1400) may include a spacer (1430) and a friction pad (1440).

[0177] The second shaft protrusion (1410) may be arranged on the second shaft (1220). The second shaft protrusion (1410) may be arranged along the outer circumference of the second shaft (1220). When viewed in the axial direction of the second shaft (1220), the second shaft protrusion (1410) may have a circular structure.

[0178] That is, the second shaft protrusion (1410) may have a structure that protrudes radially outwardly along the outer surface of the second shaft (1220), and may have a shape close to a cylinder or a disk.

[0179] The second shaft protrusion (1410) may be formed integrally with the second shaft (1220). However, alternatively, the second shaft protrusion (1410) may be provided separately from the second shaft (1220) and coupled to the second shaft (1220).

[0180] That is, the second shaft protrusion (1410) is configured to be firmly connected to the second shaft (1220) and rotate together with the second shaft (1220).

[0181] The first shaft protrusion (1420) may be arranged on the first shaft (1210). The first shaft protrusion (1420) may be a part of the first shaft (1210). The first shaft protrusion (1420) may have a structure that protrudes radially outwardly from the first shaft (1210) along the outer circumferential surface of the first shaft (1210).

[0182] The shape of the first shaft protrusion (1420) may be approximately the same as that of the second shaft protrusion (1410) disposed on the second shaft (1220). In addition, the first shaft protrusion (1420) has a hollow interior, and thus, the second shaft protrusion (1410) may be disposed on the inside of the first shaft protrusion (1420).

[0183] The first shaft (1210) may be composed of two axes. That is, the first shaft (1210) may have a structure in which the 1-1 shaft (1211) and the 1-2 shaft (1212) are coupled. A part of the first shaft protrusion (1420) may be a part of the 1-1 shaft (1211), and another part of the first shaft protrusion (1420) may be a part of the 1-2 shaft (1212).

[0184] The first-first shaft (1211) includes a hollow portion, and the first-second shaft (1212) also includes a hollow portion. A second shaft (1220) is arranged in the hollow portions of the first-first shaft (1211) and the first-second shaft (1212).

[0185] Accordingly, the rotation shaft can be assembled by coupling the second shaft (1220) to the first-first shaft (1211), coupling the first-second shaft (1212) to the second shaft (1220), or vice versa.

[0186] The first-first shaft (1211) and the first-second shaft (1212) can be connected through a fastening member (1213) such as a bolt. Referring to FIG. 5, the fastening member (1213) can connect the first-first shaft (1211) and the first-second shaft (1212) by penetrating the second outer surface (1422) of the first shaft protrusion (1420).

[0187] The first shaft (1210) and the second shaft (1220) may be spaced apart from each other. The outer surface of the second shaft (1220) and the inner surface of the first shaft (1210) may be spaced apart from each other. In addition, the second shaft protrusion (1410) and the first shaft protrusion (1420) may be spaced apart from each other.

[0188] That is, a separation space is formed between the first shaft (1210) and the second shaft (1220), and oil can be placed in the separation space. In addition, a separation space is also formed between the first shaft protrusion (1420) and the second shaft protrusion (1410), and oil is also placed in the separation space between the first shaft protrusion (1420) and the second shaft protrusion (1410).

[0189] The oil can reduce friction between the first shaft (1210) and the second shaft (1220), and can also reduce friction between the outer surface of the second shaft protrusion (1410) and the inner surface of the first shaft protrusion (1420).

[0190] The housing (1450) forms the exterior of the buffer portion (1400). The housing (1450) is positioned on the outside of the first shaft protrusion (1420). The housing (1450) can be coupled with the hull to support the shaft portion (1200).

[0191] The inner structure of the housing (1450) may roughly correspond to the outer structure of the first shaft protrusion (1420). The inner surface of the housing (1450) and the outer surface of the first shaft protrusion (1420) may be spaced apart from each other.

[0192] That is, a separation space can be formed between the housing (1450) and the first shaft protrusion (1420), and oil can be placed in the separation space. As the first shaft (1210) rotates, the first shaft protrusion (1420) also rotates, and the oil placed between the housing (1450) and the first shaft protrusion (1420) can reduce friction between the housing (1450) and the first shaft protrusion (1420).

[0193] A spacer (1430) may be arranged on the outer surface of the second shaft protrusion (1410). The spacer (1430) arranged on the outer surface of the second shaft protrusion (1410) may be referred to as a first spacer (1431).

[0194] The first spacer (1431) may have a structure surrounding the outer surface of the second shaft protrusion (1410). The first spacer (1431) may be coupled to the outer surface of the second shaft protrusion (1410). The first spacer (1431) may have a structure in which a thin plate is wound in a ring shape.

[0195] In this case, the material of the first spacer (1431) may be metal. However, the first spacer (1431) may be composed of epoxy or acrylic tape. The first spacer (1431) may be formed by applying epoxy to the outer surface of the second shaft protrusion (1410).

[0196] Additionally, the first spacer (1431) can be formed by wrapping an acrylic tape around the second shaft protrusion (1410). It is preferable that the first spacer (1431) be formed of a material that is resistant to oil.

[0197] The first spacer (1431) may have a thickness. The thickness of the first spacer (1431) may be referred to as the first thickness. The first thickness is smaller than the distance between the outer surface of the second shaft protrusion (1410) and the inner surface of the first shaft protrusion (1420).

[0198] The first thickness can be varied as needed. That is, the thickness of the oil layer disposed between the first spacer (1431) and the first shaft protrusion (1420) can be varied depending on the first thickness. That is, the thickness of the oil layer can be adjusted by adjusting the first thickness.

[0199] A spacer (1430) may be arranged on the outer surface of the first shaft protrusion (1420). The spacer (1430) arranged on the outer surface of the first shaft protrusion (1420) may be referred to as a second spacer (1432).

[0200] The second spacer (1432) may have a structure surrounding the outer surface of the first shaft protrusion (1420). The second spacer (1432) may be coupled to the outer surface of the first shaft protrusion (1420). The second spacer (1432) may have a structure in which a thin plate is wound in a ring shape.

[0201] In this case, the material of the second spacer (1432) may be metal. However, the second spacer (1432) may be composed of epoxy or acrylic tape. The second spacer (1432) may be formed by applying epoxy to the outer surface of the second shaft protrusion (1410).

[0202] Additionally, the second spacer (1432) can be formed by winding an acrylic tape around the second shaft protrusion. It is preferable that the second spacer (1432) be formed of a material that is resistant to oil.

[0203] The second spacer (1432) may have a thickness. The thickness of the second spacer (1432) may be referred to as a second thickness. The second thickness is smaller than the distance between the outer surface of the second shaft protrusion (1410) and the inner surface of the first shaft protrusion (1420).

[0204] The second thickness may vary as needed. The distance between the inner surface of the second spacer (1432) and the housing (1450) may vary depending on the second thickness. That is, the thickness of the oil layer of the oil disposed between the second spacer (1432) and the housing (1450) may vary depending on the second thickness. That is, the thickness of the oil layer may be adjusted by adjusting the second thickness.

[0205] A friction pad (1440) may be arranged on the second shaft protrusion (1410). The friction pad (1440) may be arranged on the outer surface of the second shaft protrusion. A plurality of friction pads (1440) may be arranged on the second shaft protrusion (1410).

[0206] A plurality of friction pads (1440) may be respectively disposed on the first outer surface (1411) of the second shaft protrusion (1410) and the second outer surface (1412) disposed opposite the first outer surface (1411). The friction pad (1440) disposed on the second shaft protrusion (1410) may be referred to as a first friction pad (1441).

[0207] The first friction pad (1441) is disposed on the second shaft protrusion (1410) and can support the axial load of the second shaft (1220). That is, when the second shaft (1220) moves axially within the first shaft (1210), the first friction pad (1441) can support the axial load of the second shaft (1220) by contacting the inner surface of the first shaft protrusion (1420) of the first shaft (1210).

[0208] The first friction pad (1441) may have a ring structure. That is, the first friction pad (1441) may include a hollow portion. A portion of the second shaft (1220) may be positioned to penetrate the hollow portion of the first friction pad (1441).

[0209] The first friction pad (1441) can be coupled to the outer surface of the second shaft protrusion (1410). One side of the first friction pad (1441) can be arranged to contact the outer surface of the second shaft protrusion (1410).

[0210] A groove (1445) may be arranged on the other side of the first friction pad (1441). The groove (1445) may be a groove extending along the radial direction of the first friction pad (1441). A plurality of grooves (1445) may be arranged. A plurality of grooves (1445) may be arranged radially on the other side of the first friction pad (1441).

[0211] A friction pad (1440) may be disposed on the first shaft protrusion (1420). The friction pad (1440) may be disposed on the outer surface of the first shaft protrusion (1420). The friction pads (1440) disposed on the first shaft protrusion (1420) may be disposed in plurality. The plurality of friction pads (1440) may be disposed on the first outer surface (1421) of the first shaft protrusion (1420) and the second outer surface (1422) disposed on the opposite side of the first outer surface (1421). The friction pad (1440) disposed on the first shaft protrusion (1420) may be referred to as a second friction pad (1442).

[0212] The second friction pad (1442) is arranged on the first shaft protrusion (1420) and can support the axial load of the first shaft (1210). That is, when the first shaft (1210) moves in the axial direction, the second friction pad (1442) can contact the inner surface of the housing (1450) and support the axial load of the first shaft (1210).

[0213] The second friction pad (1442) may have a ring structure. That is, the second friction pad (1442) may include a hollow portion. A portion of the first shaft (1210) may be disposed to penetrate the hollow portion of the second friction pad (1442).

[0214] The second friction pad (1442) can be coupled to the outer surface of the first shaft protrusion (1420). One side of the second friction pad (1442) can be positioned in contact with the outer surface of the first shaft protrusion (1420).

[0215] The other side of the second friction pad (1442) may have a groove (1445) arranged thereon. The groove (1445) may be a groove extending along the radial direction of the second friction pad (1442). A plurality of grooves (1445) may be arranged. A plurality of grooves (1445) may be arranged radially on the other side of the second friction pad (1442).

[0216] FIG. 7 illustrates a neutral state of a shaft portion of a propulsion device according to the present invention, FIG. 8 illustrates axial movement of a second shaft of a propulsion device according to the present invention, and FIG. 9 illustrates axial movement of a first shaft of a propulsion device according to the present invention.

[0217] The operation and effect of the buffer unit (1400) according to the present invention will be described with reference to FIGS. 7 to 9.

[0218] Referring to Fig. 7, the second shaft (1220) placed within the first shaft (1210) in a neutral state is spaced apart from the first shaft (1210). That is, a space is formed between the second shaft (1220) and the first shaft (1210).

[0219] Oil may be placed in the gap between the second shaft (1220) and the first shaft (1210). The oil may reduce friction acting between the second shaft (1220) and the first shaft (1210).

[0220] The first separation distance between the outer surface of the second shaft protrusion (1410) of the second shaft (1220) and the inner surface of the first shaft protrusion (1420) of the first shaft (1210) can be changed by the first spacer (1431). That is, if the first thickness of the first spacer (1431) becomes thicker, the first separation distance can become smaller. Conversely, if the first thickness of the first spacer (1431) becomes thinner, the first separation distance can become larger.

[0221] Referring to FIG. 8, the second shaft (1220) can move axially within the first shaft. In this case, the range of movement of the second shaft (1220) can be limited to the range of the gap between the first shaft protrusion (1420) and the second shaft protrusion (1410). That is, the axial movement of the second shaft (1220) can be limited by the first shaft protrusion (1420) of the first shaft (1210).

[0222] Based on Fig. 8, oil disposed between the second shaft protrusion (1410) and the first shaft protrusion (1420) can flow in the opposite direction to the movement direction of the second shaft (1220).

[0223] Specifically, when the second shaft (1220) moves in the first direction, a portion of the oil disposed in the gap between the second shaft protrusion (1410) and the first shaft protrusion (1420) can flow in the second direction. That is, the oil can flow in the second direction through the gap formed between the first spacer (1431) and the inner surface of the first shaft protrusion (1420).

[0224] With reference to FIG. 8, when the second shaft (1220) moves in the second direction, some of the oil placed in the space between the second shaft protrusion (1410) and the first shaft protrusion (1420) can flow in the first direction.

[0225] That is, the oil can flow in the first direction through the separation space formed between the first spacer (1431) and the inner surface of the first shaft protrusion (1420).

[0226] Since the oil has viscosity, it can act as a resistance to the axial movement of the second shaft (1220). That is, axial vibration that may occur as the second shaft (1220) moves axially within the first shaft (1210) due to the viscosity of the oil can be damped by the oil.

[0227] The first spacer (1431) can adjust the first separation distance between the outer surface of the second shaft protrusion (1410) and the inner surface of the first shaft protrusion (1420). Specifically, when the first thickness of the first spacer (1431) is increased, the first separation distance is reduced, and the flow speed of the oil according to the axial movement of the second shaft (1220) is also reduced, so that a damping effect similar to an increase in the viscosity of the oil can be obtained.

[0228] Conversely, if the first thickness of the first spacer (1431) is made thin, the first separation distance increases, and the flow speed of the oil according to the axial movement of the second shaft (1220) also increases, so that a damping effect similar to lowering the viscosity of the oil can be obtained.

[0229] The first friction pad (1441) is arranged on one side and the other side of the second shaft protrusion (1410). When the second shaft (1220) moves in the first direction or the second direction within the first shaft (1210), the first friction pad (1441) can contact the inner surface of the first shaft protrusion (1420) to distribute the load.

[0230] When the first friction pad (1441) comes into contact with the inner surface of the first shaft protrusion (1420), oil can flow through the groove (1445) formed in the first friction pad (1441).

[0231] Accordingly, through the oil flowing through the home portion (1445), vibration due to axial movement of the second shaft (1220) can be reduced, and friction between the first friction pad (1441) and the inner surface of the first shaft protrusion (1420) due to rotation of the second shaft (1220) can also be reduced.

[0232] Referring to FIG. 9, the first shaft (1210) can move axially within the housing (1450). In this case, the range of movement of the first shaft (1210) can be limited to the range of the gap between the housing (1450) and the first shaft protrusion (1420). That is, the axial movement of the first shaft (1210) can be limited by the housing.

[0233] Based on FIG. 9, oil disposed between the first shaft protrusion (1420) and the housing (1450) can flow in the opposite direction to the movement direction of the first shaft (1210).

[0234] When the first shaft (1210) moves in the first direction, a portion of the oil disposed in the space between the first shaft protrusion (1420) and the housing (1450) can flow in the second direction. That is, the oil can flow in the second direction through the space formed between the second spacer (1432) and the housing (1450).

[0235] With reference to FIG. 9, when the first shaft (1210) moves in the second direction, a portion of the oil disposed in the space between the first shaft protrusion (1420) and the housing (1450) can flow in the first direction. That is, the oil can flow in the first direction through the space formed between the second spacer (1432) and the housing (1450).

[0236] Since the oil has viscosity, it can act as a resistance to the axial movement of the first shaft (1210). That is, the axial vibration that may occur as the first shaft (1210) moves axially within the housing (1450) due to the viscosity of the oil can be damped by the oil.

[0237] The second spacer (1432) can adjust the second separation distance between the outer surface of the first shaft protrusion (1420) and the inner surface of the housing (1450). Specifically, when the second thickness of the second spacer (1432) is increased, the second separation distance is reduced, and the flow speed of the oil according to the axial movement of the second shaft is also reduced, so that a damping effect similar to an increase in the viscosity of the oil can be obtained.

[0238] Conversely, if the second thickness of the second spacer (1432) is made thin, the second separation distance increases, and the flow velocity of the oil according to the axial movement of the second shaft (1220) also increases, so that a damping effect similar to lowering the viscosity of the oil can be obtained.

[0239] The second friction pad (1442) is arranged on one side and the other side of the first shaft protrusion (1420). When the second shaft (1220) moves in the first direction or the second direction within the first shaft (1210), the second friction pad (1442) can contact the inner surface of the first shaft protrusion (1420) to distribute the load.

[0240] When the second friction pad (1442) comes into contact with the inner surface of the first shaft protrusion (1420), oil can flow through the groove (1445) formed in the second friction pad (1442). Therefore, through the oil flowing through the groove (1445), vibration caused by axial movement of the first shaft (1210) can be reduced, and friction between the second friction pad (1442) and the inner surface of the housing (1450) caused by rotation of the first shaft (1210) can also be reduced.

[0241] Hereinafter, a ship propulsion device according to a second embodiment of the present invention will be described in detail.

[0242]

[0243] FIG. 10 is a schematic drawing of a vessel including a ship propulsion device according to embodiments of the present invention. FIG. 11 is an enlarged drawing of portion A of FIG. 1. FIG. 12 is an enlarged drawing of the thrust support unit according to the present invention in FIG. 11. FIGS. 13a to 13d are drawings illustrating the process of installing the thrust support unit according to the present invention on the hull.

[0244] Referring to FIGS. 10 to 12, a propulsion device for a ship according to the present invention (hereinafter referred to as a "propulsion device (200)") generates propulsion force for a ship (1) on the sea and may be located at the stern of a hull (SB). The propulsion device (200) may include a propeller unit (2100), a driving unit (2200), and a thrust support unit (2300).

[0245] Referring to FIG. 10, the propeller unit (2100) according to the present invention can rotate and generate rotational force by receiving power from the driving unit (2200) described later. The ship (1) can move on the sea by the rotational force generated from the propeller unit (2100).

[0246] The propeller section (2100) may include a counter-rotating propeller (2110) and a shaft section (2150). The counter-rotating propeller (2110) may be rotatable in opposite directions and may include a front propeller (2111) and a rear propeller (2115).

[0247] The front propeller (2111) and the rear propeller (2115) share a rotational center axis (AX1) and can be positioned on the rotational center axis. The front propeller (2111) can be positioned relatively forward (right side in Fig. 11) compared to the rear propeller (2115).

[0248] The front propeller (2111) is coupled to a shaft portion (2150) to be described later, specifically, a first shaft (2151), and can rotate together as the first shaft (2151) rotates. The rear propeller (2115) is positioned relatively rearward of the front propeller (2111) and can rotate in the opposite direction to the front propeller (2111).

[0249] The rear propeller (2115) is coupled to a shaft portion (2150), specifically, a second shaft (2155), and can rotate together as the second shaft (2155) rotates.

[0250] Referring to FIGS. 11 and 12, a shaft portion (2150) is connected to a counter-rotating propeller (2110) and may form a rotational center axis (AX1) of the counter-rotating propeller (2110). The shaft portion (2150) may include a first shaft (2151) and a second shaft (2155).

[0251] The first shaft (2151) forms the rotation axis of the front propeller (2111) and can be coupled to the front propeller (2111) which is positioned relatively forward.

[0252] The second shaft (2155) forms the rotation axis of the rear propeller (2115) and can be coupled to the rear propeller (2115) which is positioned relatively rearward compared to the front propeller (2111). The second shaft (2155) can be inserted into the thrust support member (2300) by penetrating the first shaft (2151).

[0253] Referring to FIGS. 11 and 12, the first shaft (2151) and the second shaft (2155) may have a longitudinal central axis (or rotational central axis) (AX1). The first shaft (2151) may be hollow internally, and the second shaft (2155) may be positioned inside the first shaft (2151). As a result, the first shaft (2151) and the second shaft (2155) may have an overlapping structure along the longitudinal central axis.

[0254] One end of the shaft portion (2150), specifically, each end of the first shaft (2151) and the second shaft (2155), may be placed inside the thrust support portion (2300) to be described later. That is, one end (left side in FIG. 11) of the first shaft (2151) and the second shaft (2155) may be connected to the front propeller (2111) and the rear propeller (2115), respectively, and the other end (right side in FIG. 11) opposite thereto may be connected to the thrust support portion (2300).

[0255] Specifically, one end (right end as shown in FIG. 11) formed on the other side of the first shaft (2151) and the second shaft (2155) can be placed inside the thrust support member (2300).

[0256] Referring to FIG. 11 and FIG. 12, a first extension (2152) may be formed to extend radially from a rotational center axis (AX1) at one end of a first shaft (2151) disposed inside a thrust support member (2300).

[0257] In addition, a second extension (2156) may be formed to extend radially from the rotation center axis (AX1) at one end of the second shaft (2155) disposed inside the first shaft (2151), specifically, the second shaft (2155) disposed inside the thrust support member (2300).

[0258] Referring to FIGS. 11 and 12, the first expansion portion (2152) and the second expansion portion (2156) formed on the first shaft (2151) and the second shaft (2155), respectively, can be arranged to be in contact with each other in the direction of the rotational center axis of the shaft portion (2150) and the support unit (2350) disposed inside the thrust support portion (2300) described later, specifically the support housing portion (2330).

[0259] This allows the support unit (2350) to support a load in the direction of the rotational center axis of the first shaft (2151) and the second shaft (2155).

[0260] In addition, since the first extension (2152) and the second extension (2156) formed on the first shaft (2151) and the second shaft (2155) are arranged inside the thrust support unit (2300), a separate coupling member is not required to connect the first shaft (2151), the second shaft (2155) and the thrust support unit (2300), and thus, an increase in the length of the shaft system due to such a coupling member can be prevented.

[0261] Referring to Fig. 11, the driving unit (2200) according to the present invention generates power for propulsion and can be connected to the thrust support unit (2300). In the present invention, the driving unit (2200) can generate power in the form of an electric motor.

[0262] However, it is not limited to this, and various modifications such as internal combustion engines and engines are possible within the technical concept of being able to transmit rotational power to the thrust support unit (2300) and shaft unit (2150).

[0263] Referring to FIG. 11, the driving unit (2200) may include a driving housing unit (2210), a first driving body (2230), and a second driving body (2250). The driving housing unit (2210) accommodates the first driving body (2230) and the second driving body (2250), and the driving unit (2200) according to the present invention can generate multiple rotational forces in a single device.

[0264] That is, a first driving body (2230) and a second driving body (2250) that share a rotational center axis and can rotate independently of each other can be rotatably arranged in the driving housing portion (2210). The driving housing portion (2210) can be positionally fixed to the hull (SB).

[0265] Referring to Fig. 11, the first driving body (2230) is connected to the thrust support unit (2300) and can receive power to generate power, specifically, rotational force. The rotational force generated in the first driving body (2230) can be transmitted to the first shaft (2151) through the thrust support unit (2300).

[0266] The first driving body (2230) is accommodated in the driving housing (2210) and may include a stator (drawing symbol not specified) and a rotor (drawing symbol not specified). The rotor rotates relative to the stator and may generate rotational power.

[0267] The second driving body (2250) is connected to the driving housing (2210) and the thrust support member (2300), and can receive power to generate power, specifically, rotational force. The rotational force generated in the second driving body (2250) can be transmitted to the second shaft (2155) through the thrust support member (2300).

[0268] The second driving body (2250) is accommodated in the driving housing (2210) and may include a stator (drawing symbol not specified) and a rotor (drawing symbol not specified). The rotor rotates relative to the stator and may generate rotational power.

[0269] The first driving body (2230) can generate a rotational force in a first direction, and the second driving body (2250) can generate a rotational force in a second direction opposite to the first direction, which is the rotational direction of the first driving body (2230).

[0270] Referring to FIGS. 11 and 12, the thrust support unit (2300) according to the present invention corresponds to the buffer unit (1400) in the propulsion device (100) according to the first embodiment, is connected to the propeller unit (2100) and the drive unit (2200), and can transmit the thrust generated from the propeller unit (2100) to the hull (SB).

[0271] Referring to FIG. 11 and FIG. 12, the thrust support member (2300) may include a connecting shaft member (2310), a support housing member (2330), and a support unit (2350).

[0272] The connecting shaft portion (2310) connects the shaft portion (2150) and the driving portion (2200), and one area along the rotational center axis (or longitudinal center axis) may be located inside the support housing portion (2330), and the other area may be located outside the support housing portion (2330).

[0273] The above-mentioned one region of the connecting shaft portion (2310) can be coupled with the shaft portion (2150), specifically, the end of the first shaft (2151) and the second shaft (2155), and the other region opposite thereto can be coupled with the first driving body (2230) and the second driving body (2250).

[0274] Accordingly, the rotational force generated from the driving unit (2200) can be transmitted to the shaft unit (2150), and the shaft unit (2150), specifically the first shaft (2151), can rotate the front propeller (2111) in a first direction, and the second shaft (2155) can rotate the rear propeller (2115) in a second direction opposite to the first direction.

[0275] Referring to FIGS. 11 and 12, the connecting shaft portion (2310) may include a first connecting shaft (2311) and a second connecting shaft (2315). The first connecting shaft (2311) connects the first shaft (2151) and the driving portion (2200), and may include a first connecting shaft body (2311a) and a first connecting member (2311b).

[0276] The first connecting shaft body (2311a) is connected to the first shaft (2151), and the first connecting member (2311b) can connect the first connecting shaft body (2311a) and the driving unit (2200).

[0277] The first connecting shaft body (2311a) is formed in a hollow tubular shape inside, surrounds the second connecting shaft body (2315a), and can be connected to the first shaft (2151) placed inside the thrust support member (2300), specifically, the first extension (2152) formed to extend radially from one end of the first shaft (2151).

[0278] As a result, the first connecting shaft body (2311a) and the first shaft (2151) can surround the second connecting shaft body (2315a) and the second shaft (2155) and accommodate the second connecting shaft body (2315a) and the second shaft (2155) inside.

[0279] Referring to FIGS. 11 and 12, the first connecting member (2311b) is formed in a hollow tubular shape, and the first connecting shaft body (2311a) can be inserted into the first connecting member (2311b). One side of the first connecting member (2311b) facing the driving unit (2200) can have an expansion area (drawing symbol not set) in the radial direction from the rotational center axis, and the expansion area formed in the first connecting member (2311b) can be coupled with the first driving body (2230).

[0280] One side of the first driving body (2230) facing the first connecting member (2311b) may also have an extension area (drawing symbol not set) in the radial direction from the rotation center axis, similar to the first connecting member (2311b).

[0281] However, it is not limited to this, and the first connecting member (2311b) may be formed in a tubular shape with both sides open and the inside hollow, and in this case, various modifications are possible, such as the opposing ends of the first connecting shaft body (2311a) and the first driving body (2230) being inserted into the first connecting member (2311b).

[0282] The second connecting shaft (2315) connects the second shaft (2155) and the driving unit (2200), and may include a second connecting shaft body (2315a) and a second connecting member (2315b).

[0283] The second connecting shaft body (2315a) is connected to the second shaft (2155), and the second connecting member (2315b) can connect the second connecting shaft body (2315a) and the driving unit (2200).

[0284] The second connecting shaft body (2315a) can be coupled to a second shaft (2155) disposed inside the thrust support member (2300), specifically, a second extension (2156) formed to extend radially from one end of the second shaft (2155).

[0285] The second connecting shaft body (2315a) and the second connecting member (2315b) can be accommodated inside the first connecting shaft body (2311a) and the first connecting member (2311b).

[0286] Referring to FIG. 11 and FIG. 12, the second connecting member (2315b) is formed in a hollow tubular shape, and is opened on both sides with respect to the longitudinal central axis (AX1), into which the second connecting shaft body (2315a) can be inserted.

[0287] In addition, one end of the second driving body (2250) can be inserted into the second connecting member (2315b). However, this is not limited to this, and various modifications are possible, such as the second connecting member (2315b) being inserted into one end of the second driving body (2250).

[0288] However, it is not limited to this, and various modifications are possible, such as forming an expansion area in the radial direction based on the rotation center axis at one end of the second connecting member (2315b) facing the second connecting shaft body (2315a), like the first connecting member (2311b), and forming an expansion area in the second connecting shaft body (2315a) and joining the two.

[0289] Referring to FIG. 11 and FIG. 12, the support housing portion (2330) surrounds the shaft portion (2150) and the connecting shaft portion (2310) and is placed on the hull (SB), so that one side (the lower side based on FIG. 12) can be positionally fixed on the hull (SB).

[0290] Specifically, the support housing part (2330) can be placed on the hull (SB) and surrounds the area where the first shaft (2151) and the first connecting shaft body (2311a) are connected and the area where the second shaft (2155) and the second connecting shaft body (2315a) are connected.

[0291] Referring to Fig. 12, the support housing part (2330) may include a housing body part (2331) and a height adjustment part (2335). The housing body part (2331) has a hollow interior and may surround a shaft part (2150) and a connecting shaft part (2310). The housing body part (2331) may include a plurality of detachable housing bodies.

[0292] Specifically, the housing body part (2331) may include a first housing body (2332) that surrounds one side (lower side as shown in FIG. 12) of the shaft part (2150) and the connecting shaft part (2310), and a second housing body (2333) that surrounds the other side (upper side as shown in FIG. 12) opposite to the one side.

[0293] Although not shown in the drawing, the first housing body (2332) and the second housing body (2333) can be fastened using a fastening member such as a bolt.

[0294] Referring to FIGS. 11 and 12, a bearing unit (BU) may be arranged in the first housing body (2332) and the second housing body (2333). The bearing unit (BU) may be arranged on an installation groove (drawing symbol not set) formed on each surface of the first housing body (2332) and the second housing body (2333), which are arranged to face each other.

[0295] Due to the bearing unit (BU), the rotation of the shaft portion (2150) disposed inside the first housing body (2332) and the second housing body (2333), specifically the first shaft (2151), and the connecting shaft portion (2310), specifically the first connecting shaft body (2311a) provided on the first connecting shaft (2311) can be stably supported.

[0296] Referring to FIG. 11 and FIG. 12, the height adjustment unit (2335) is positioned between the hull (SB) and the housing body (2331), specifically, the first housing body (2332), and can be connected to the first housing body.

[0297] The height of the housing body (2331) can be adjusted by adjusting the height of the height adjustment unit (2335) according to the present invention.

[0298] By installing the propulsion device (200) according to the present invention and considering the height of the rotation center axis (AX1) of the shaft portion (2150) and the connecting shaft portion (2310), the height of the housing body portion (2331) in which the connection area of ​​the shaft portion (2150) and the connecting shaft portion (2310) is accommodated can be adjusted through the height adjustment portion (2335).

[0299] As an optional embodiment, the height adjustment unit (2335) can adjust the overall height by tightening or loosening a fastening member such as a bolt.

[0300] As the height adjustment unit (2335) adjusts the height of the housing body (2331), the shaft system of the propulsion device (200) can be stably aligned.

[0301] Referring to FIG. 11 and FIG. 12, the support unit (2350) according to the present invention is disposed inside the support housing portion (2330) and surrounds the shaft portion (2150), and can support the load in the axial direction of the shaft portion (2150).

[0302] Referring to FIG. 12, a plurality of support units (2350) are provided and can be spaced apart along the longitudinal central axis (or rotational central axis (AX1)) of the shaft portion (2150) and the connecting shaft portion (2310).

[0303] The support unit (2350) is formed in a ring shape and can be arranged to surround the shaft portion (2150), specifically the first shaft (2151) or the second shaft (2155), and can be arranged to surround the connecting shaft portion (2310), specifically the first connecting shaft body (2311a) or the second connecting shaft body (2315a).

[0304] The support unit (2350) may include a plurality of support unit (2350) bodies (drawing symbol not set) that can be fastened to each other.

[0305] Accordingly, as shown in FIGS. 13c and 13d, the support unit (2350) body that wraps around one side (lower side based on FIG. 13c) of the shaft portion (2150) can be installed first, and then the support unit (2350) body that wraps around the other side (upper side based on FIG. 13d) of the shaft portion (2150) can be coupled.

[0306] Any one of the plurality of support units (2350) may be an outer shaft support unit (2351) that supports the axial load of the first connecting shaft body (2311a), the first shaft (2151) forming the rotation axis of the front propeller (2111).

[0307] Additionally, another one of the plurality of support units (2350) may be an inner shaft support unit (2355) that supports the axial load of the second connecting shaft body (2315a), the second shaft (2155) forming the rotation axis of the rear propeller (2115).

[0308] Referring to FIG. 12, the external support unit (2351) can be arranged between the first extension (2152) formed at one end of the first shaft (2151) and the inner wall of the housing main body (2331), and can be arranged between the inner wall of the housing main body (2331) facing the extension area formed at one end of the first connecting shaft main body (2311a) connected to the first shaft (2151).

[0309] Due to this, the external support unit (2351) can support the load in the axial direction of the area where the first shaft (2151) and the first connecting shaft body (2311a) are connected inside the thrust support unit (2300), can stably transmit the propulsion force generated by the propulsion device (200) to the hull (SB), and has the effect of reducing and absorbing vibration and shock generated in the process of transmitting the propulsion force.

[0310] Referring to FIG. 12, the inner support unit (2355) can be arranged between the second expansion portion (2156) formed at one end of the second shaft (2155) and the first expansion portion (2152), and can be arranged between the inner wall of the expansion portion of the first connection shaft body (2311a) facing the expansion portion formed at one end of the second connection shaft body (2315a) connected to the second shaft (2155).

[0311] Due to this, the inner shaft support unit (2355) can support the load in the axial direction of the area where the second shaft (2155) and the second connecting shaft body (2315a) are connected inside the thrust support unit (2300), can stably transmit the propulsion force generated by the propulsion device (200) to the hull (SB), and has the effect of reducing and absorbing vibration and shock generated in the process of transmitting the propulsion force.

[0312] A method for installing a ship propulsion device according to the present invention as described above is described.

[0313] Fig. 14 is a flowchart illustrating a method for installing a ship propulsion device according to the present invention. Fig. 15 is a flowchart illustrating a step of connecting a thrust support member to a propeller member.

[0314] The method for installing a ship propulsion device (200) according to the present invention may include a step (S2100) of inserting one side of a propeller part (2100) into a hull (SB), a step (S2200) of supporting a preset section of the propeller part (2100), a step (S2300) of connecting a thrust support part (2300) to the propeller part (2100), a step (S2400) of supporting the thrust support part (2300), and a step (S2500) of connecting a driving part (2200) to the thrust support part (2300).

[0315] Referring to FIG. 13a, in the step (S2100) of inserting one side of the propeller part (2100) into the hull (SB), one side of the propeller part (2100) can be inserted through a passage (drawing symbol not set) formed in the hull (SB).

[0316] Specifically, the second shaft (2155) coupled with the rear propeller (2115) can be inserted through a passage formed at the stern of the ship (1) while being positioned inside the first shaft (2151) coupled with the front propeller (2111).

[0317] Next, a preset section of the propeller part (2100) inserted into the support member (SU), specifically the first shaft (2151), can be supported. This can prevent the rotational center axis of the propeller part (2100) from shaking or changing position.

[0318] Referring to FIGS. 13a to 13d, the step (S2300) of connecting the thrust support member (2300) to the propeller member (2100) may include the step (S2310) of arranging the support unit (2350) to the propeller member (2100), the step (S2330) of connecting the connecting shaft member (2310) to the propeller member (2100), the step (S2350) of wrapping the propeller member (2100) and the connecting shaft member (2310) with the support housing member (2330) and arranging them on the hull (SB), and the step (S2370) of adjusting the height of the thrust support member (2300).

[0319] Referring to FIG. 13a, in the step (S2310) of placing the support unit (2350) on the propeller unit (2100), the support unit (2350), specifically the inner shaft support unit (2355), can be placed between the first extension (2152) formed on the first shaft (2151) and the second extension (2156) formed on the second shaft (2155) while supporting a portion of the shaft unit (2150), specifically the first shaft (2151), with the support member (SU).

[0320] Referring to FIG. 13b, in the step (S2350) of connecting the connecting shaft portion (2310) to the propeller portion (2100), first, the second connecting shaft body (2315a) is connected to the second shaft (2155), and the inner shaft support unit (2355) can be placed on the second connecting shaft body (2315a) so as to face the expansion area formed on the second connecting shaft body (2315a).

[0321] Next, the second shaft (2155) and the second connecting shaft body (2315a) can be wrapped around each other, and the first connecting shaft body (2311a) can be connected to the first extension (2152) formed on the first shaft (2151). At this time, by arranging a support member (SU) in one area of ​​the second connecting shaft body (2315a), the thrust support member (2300) can be supported (S2400), and the rotational center axis of the shaft system of the propulsion device (200) can be prevented from changing.

[0322] Referring to FIG. 13c and FIG. 13d, in the step (S2350) of wrapping the propeller part (2100) and the connecting shaft part (2310) with the support housing part (2330) and arranging them on the hull (SB), first, the first housing body (2332) and the height adjustment part (2335) can be arranged to wrap the shaft part (2150), the connecting shaft part (2310), and the support unit (2350) from one side (the lower side based on FIG. 13c).

[0323] Next, the second housing body (2333) can be placed to surround the shaft portion (2150), the connecting shaft portion (2310), and the support unit (2350) on the other side (upper side based on Fig. 13c). The first housing body (2332) and the second housing body (2333) can be fastened using a fastening member such as a bolt.

[0324] In the step (S2370) of adjusting the height of the thrust support member (2300), by operating the height adjustment member (2335), the height of the thrust housing member surrounding the shaft member (2150) and the connecting shaft member (2310) can be adjusted, and the position of the rotation center axis (AX1) of the shaft system of the propulsion device (200) can be precisely adjusted.

[0325] Referring to FIG. 13d, after the arrangement of the thrust housing part is completed, the first connecting member (2311b) and the second connecting member (2315b) can be connected to the connecting shaft part (2310), specifically, the first connecting shaft body (2311a) and the second connecting shaft body (2315a), respectively.

[0326] After the first connecting member (2311b) and the second connecting member (2315b) are connected, the driving unit (2200) can be connected to the thrust support unit (2300) as illustrated in FIG. 11. Specifically, the first driving body (2230) that generates the rotational force of the first shaft (2151) can be connected to the first connecting member (2311b), and the second driving body (2250) that generates the rotational force of the second shaft (2155) can be connected to the second connecting member (2315b).

[0327] Since one end of the shaft portion (2150) of the propulsion device (200) according to the present invention is arranged inside the thrust support portion (2300), a separate member for connecting the shaft portion (2150) to the outside of the thrust support portion (2300) is not required, thereby reducing the shaft length of the propulsion device (200).

[0328] That is, since the first extension (2152) and the second extension (2156) formed on the first shaft (2151) and the second shaft (2155) are arranged inside the thrust support member (2300), a separate coupling member is not required to connect the first shaft (2151), the second shaft (2155) and the thrust support member (2300), and thus, an increase in the length of the shaft system due to such a coupling member can be prevented.

[0329] Additionally, by reducing the length of the axle, there is the effect of securing additional cargo loading space.

[0330] In addition, since the load in the axial direction of the first shaft (2151) and the first connecting shaft body (2311a) forming the outer axis inside the thrust support unit (2300) and the second shaft (2155) and the second connecting shaft body (2315a) forming the inner axis can be supported simultaneously, there is no need to install a separate thrust support structure at the front and rear of the driving unit (2200), so that the shaft length can be reduced and there is an effect of securing a cargo loading space.

[0331]

[0332] Hereinafter, the configuration and effects of a ship propulsion device according to a modified example of the second embodiment of the present invention will be described. Fig. 16 is a drawing illustrating a ship propulsion device according to a modified example of the second embodiment of the present invention.

[0333] Referring to FIG. 16, a propulsion device (200`) according to a modified example of the second embodiment of the present invention may include a propeller unit (2100), a driving unit (2200`), and a thrust support unit (2300`).

[0334] Since the configuration of the driving unit (2200`) of the propulsion device (200`) is different from that of the driving unit (2200) according to the present invention, this will be described in detail.

[0335] Referring to FIG. 16, the driving unit (2200`) may include a first driving housing (2210`A) that accommodates a first driving body (2230`), a second driving housing (2210`B) that is spaced apart from the first driving housing (2210`A) and accommodates a second driving body (2250`), a first driving body (2230`), and a second driving body (2250`).

[0336] The first drive housing (2210`A) and the second drive housing (2210`B) can be spaced apart from each other by a preset interval, and the second drive shaft (2251`) forming the rotational center axis of the second drive body (2250`) placed in the second drive housing (2210`B) can pass through the first drive housing (2210`A) and be connected to the second connecting member (2315b) provided in the thrust support member (2300).

[0337] As an optional embodiment, a separate shaft may be arranged inside the first drive shaft (2231`) provided in the first drive body (2230`) arranged in the first drive housing (2210`A) to connect the second connecting member (2315b) provided in the thrust support member (2300) and the second drive shaft (2251`).

[0338] The propulsion device (200`) according to a modified example of the second embodiment of the present invention is, compared to the propulsion device (200) described above, the power transmitted to the first shaft (2151) forming the rotation axis of the front propeller (2111) and the second shaft (2155) forming the rotation axis of the rear propeller (2115) is generated in the first drive housing (2210`A) and the second drive housing (2210`B), respectively, and therefore, the configuration, operating principle, and effect of the propeller unit (2100) and the thrust support unit (2300) are the same as those of the propeller unit (2100) and the thrust support unit (2300) of the propulsion device (200) according to the second embodiment of the present invention, and therefore, a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0339]

[0340] Hereinafter, the configuration and effects of a ship propulsion device according to another modified example of the second embodiment of the present invention will be described.

[0341] Figure 17 is an enlarged drawing of a thrust support unit of a ship propulsion device according to another modified example of the second embodiment of the present invention.

[0342] Referring to FIG. 17, a ship propulsion device according to another modified example of the second embodiment of the present invention may include a thrust support unit (2300``).

[0343] Referring to Fig. 17, the shaft portion (2150``) is formed as a single axis, and the connecting shaft portion (2310``) connected to the shaft portion (2150``) is also formed as a single axis and can be connected to the shaft portion (2150``).

[0344] Referring to Fig. 17, an extension portion (2151``) is formed to extend radially from the end of a shaft portion (2150``) disposed inside a thrust support portion (2300``), and an extension area can also be formed at the end of a connecting shaft portion (2310``) connected to the shaft portion (2150``) to correspond to the extension portion (2151``).

[0345] A support unit (2350``) can be placed in the internal space surrounded by the thrust support member (2300``), specifically the first housing body (2332``) and the second housing body (2333``).

[0346] The support unit (2350``) can be placed between the inner wall of the housing main body (2331``) and the expansion portion (2150``) and between the expansion area formed in the connecting shaft portion (2310``) and the inner wall of the housing main body (2331``).

[0347] That is, due to the support unit (2350``), the axial load generated by the power transmitted from the driving unit to the shaft unit (2150``) through the connecting shaft unit (2310``) can be stably supported, and there is an effect of absorbing vibration and shock generated in the process.

[0348] A propulsion device according to another modified example of the second embodiment of the present invention may be provided with a separate reversing unit (not shown in the drawing) so that the rotational force of the front propeller can be converted to the opposite direction in the rear propeller as the counter-rotating propeller is connected to a shaft portion (2150``) formed as a single axis.

[0349] In another modified example of the second embodiment of the present invention, a propulsion device has a support unit (2350``) that can support the load in the axial direction of the shaft portion (2150``) and the connecting shaft portion (2310``) inside the thrust support portion (2300``), so that there is no need to install a separate thrust support structure at the front or rear of the driving portion, thereby reducing the shaft length and securing cargo loading space.

[0350] In addition, since one end of the shaft portion (2150``) is placed inside the thrust support portion (2300``), a separate fastening structure such as a coupling member for connecting the shaft portion (2150``) to the outside of the thrust support portion (2300``) is not required, thereby having the effect of reducing the shaft length.

[0351]

[0352] Hereinafter, a ship propulsion device according to a third embodiment of the present invention will be described in detail.

[0353]

[0354] Fig. 18 is an enlarged view of part A of Fig. 10. Figs. 19 to 21 are drawings illustrating a process of installing a thrust support member according to the present invention.

[0355] Referring to FIG. 10 and FIG. 18, a propulsion device for a ship according to the present invention (hereinafter referred to as a 'propulsion device (300)') generates propulsion force for a ship (1) on the sea, and can be located at the stern of a hull (SB).

[0356] The propulsion device (300) may include a front propeller section (3100), a rear propeller section (3200), a driving section (3300), and a thrust support section (3400). The ship (1) receives power from the driving section (3300) and can move on the sea by the rotational force generated from the front propeller section (3100) and the rear propeller section (3200).

[0357] Referring to FIG. 18, the front propeller unit (3100) is rotatable by receiving power from a driving unit (3300) to be described later, specifically, a first driving body (3330a), and may include a first shaft (3110) and a front propeller (3130) having the first shaft (3110) as a rotation axis (AX1).

[0358] The front propeller section (3100) can rotate in the opposite direction to the rear propeller section (3200) to be described later. The first shaft (3110) forms the rotation axis of the front propeller (3130) and can be coupled to the front propeller (3130) which is positioned relatively forward of the rear propeller (3230).

[0359] The first shaft (3110) can be connected to a driving unit (3300) to be described later, specifically, a first driving shaft unit (3350a).

[0360] When the first drive shaft part (3350a) rotates due to the power generated from the first drive body (3330a), the first shaft (3110) can rotate together with the rotation of the first drive shaft part (3350a).

[0361] The first shaft (3110) shares a rotational center axis (AX1) with the second shaft (3210) and can rotate independently of each other. That is, the first shaft (3110) can rotate in a direction opposite to the rotational direction of the second shaft (3210).

[0362] The first shaft (3110) is formed to extend along a longitudinal central axis (AX1) and may be hollow internally. Accordingly, the second shaft (3210) may be inserted into the interior of the first shaft (3110) while sharing the central axis (AX1).

[0363] The front propeller (3130) is connected to the first shaft (3110) and can rotate together as the first shaft (3110) rotates.

[0364] The front propeller (3130) shares a rotational center axis (AX1) with the rear propeller (3230), and can be spaced apart from the rotational center axis. The front propeller (3130) is positioned relatively forward (to the right in FIG. 18) relative to the rear propeller (3230), and can rotate in the opposite direction to the rear propeller (3230).

[0365] Referring to FIG. 18, the rear propeller section (3200) can rotate in the opposite direction to the front propeller section (3100), and may include a second shaft (3210) and a rear propeller (3230).

[0366] The second shaft (3210) forms a rotation axis (AX1) of the rear propeller (3230) that is positioned relatively rearward of the front propeller (3130), and can be connected to the drive unit (3300), specifically, the second drive shaft unit (3350b).

[0367] When the second drive shaft part (3350b) rotates due to the power generated from the second drive body (3330b), the second shaft (3210) can rotate together with the rotation of the second drive shaft part (3350b).

[0368] The second shaft (3210) can pass through the first shaft (3110) and be coupled to the second drive shaft portion (3350b).

[0369] Referring to FIG. 18, the first shaft (3110) and the second shaft (3210) may share a longitudinal central axis (or rotational central axis) (AX1).

[0370] The first shaft (3110) is hollow on the inside, and the second shaft (3210) can be arranged inside the first shaft (3110). As a result, the first shaft (3110) and the second shaft (3210) can have an overlapping structure along the longitudinal central axis (AX1).

[0371] Referring to FIG. 18, a driving unit (3300) according to the present invention transmits power to a first shaft (3110) coupled with a front propeller (3130) and a second shaft (3210) coupled with a rear propeller (3230), and may include a first driving housing (3310a), a first driving body (3330a), a first driving shaft portion (3350a), a second driving housing (3310b), a second driving body (3330b), and a second driving shaft portion (3350b).

[0372] Referring to FIG. 18, the driving unit (3300) according to the present invention generates power for propulsion and can be connected to the front propeller unit (3100) and the rear propeller unit (3200).

[0373] In the present invention, the driving unit (3300) can generate power using an electric motor.

[0374] However, it is not limited to this, and various modifications such as internal combustion engines and engines are possible within the technical concept of being able to transmit rotational power to the first shaft (3110) provided in the front propeller section (3100) and the second shaft (3210) provided in the rear propeller section (3200).

[0375] Referring to FIG. 18, the first drive housing (3310a) has a hollow interior and accommodates a first drive shaft (3355a), so that the first drive shaft (3355a) can rotate along a rotation axis (AX1) inside the first drive housing (3310a).

[0376] Referring to Fig. 18, one side (lower side based on Fig. 18) of the first drive housing (3310a) can be fixed to the hull (SB).

[0377] The first drive housing (3310a) is spaced apart from the second drive housing (3310b) to be described later, and a thrust support member (3400) can be placed between the first drive housing (3310a) and the second drive housing (3310b).

[0378] Referring to FIG. 18, the first driving body (3330a) generates a rotational force in the first direction and can be connected to the first driving shaft portion (3350a).

[0379] The first driving body (3330a) can receive power from an external source and generate rotational force within the first driving housing (3310a). The rotational force generated in the first driving body (3330a) can be transmitted to the first shaft (3110) through the first driving shaft portion (3350a).

[0380] The first driving body (3330a) is accommodated in the first driving housing (3310a) and may include a stator (3330a2) and a rotor (3330a1). The rotor (3330a1) rotates relative to the stator (3330a2) and may generate rotational power.

[0381] Referring to FIG. 18 and FIG. 21, the first drive shaft portion (3350a) is rotatable by receiving power generated from the first drive body (3330a), and can transmit the power to the first shaft (3110).

[0382] The first drive shaft portion (3350a) may include a first connecting member (3351a) and a first drive shaft (3355a).

[0383] The first connecting member (3351a) is connected to the first shaft (3110), and the first driving shaft (3355a) connects the first connecting member (3351a) and the first driving body (3330a), and can receive power from the first driving body (3330a) to rotate the first connecting member (3351a) and the first shaft (3110).

[0384] One end (right end in Fig. 18) of the first drive shaft (3355a) facing the second drive housing (3310b) may be arranged inside the thrust support member (3400) to be described later. The first drive shaft member (3350a) arranged inside the thrust support member (3400), specifically, one end of the first drive shaft (3355a), may have a first extension member (3356a) extending radially with respect to the rotation axis (AX1).

[0385] The first expansion portion (3356a) can be in contact with a plurality of support units (3431, 3435) to be described later, and a plurality of support units (3431, 3435) can be arranged on both sides (left and right sides based on FIG. 18) of the first expansion portion (3356a).

[0386] The first drive shaft (3355a) is hollow on the inside, and thus the second drive shaft portion (3350b) to be described later, specifically the second connecting member (3351b) and the second drive shaft (3355b), can pass through the first drive shaft (3355a) and be coupled to the first shaft (3110).

[0387] Referring to FIG. 18, the second driving body (3330b) generates a rotational force in a second direction opposite to the first direction, which is the rotational direction of the first driving body (3330a), and can be connected to the second driving shaft portion (3350b).

[0388] The second driving body (3330b) can receive power from an external source and generate rotational force within the second driving housing (3310b). The rotational force generated in the second driving body (3330b) can be transmitted to the second shaft (3210) through the second driving shaft portion (3350b).

[0389] The second driving body (3330b) is accommodated in the second driving housing (3310b) and may include a stator (3330b2) and a rotor (3330b1). The rotor (3330b1) rotates relative to the stator (3330b2) and may generate rotational power.

[0390] Referring to FIG. 18 and FIG. 21, the second drive shaft portion (3350b) is rotatable by receiving power generated from the second drive body (3330b), and can transmit the power to the second shaft (3210).

[0391] The second drive shaft portion (3350b) may include a second connecting member (3351b) and a second drive shaft (3355b).

[0392] The second connecting member (3351b) is connected to the second shaft (3210), and the second driving shaft (3355b) connects the second connecting member (3351b) and the second driving body (3330b), and can receive power from the second driving body (3330b) to rotate the second connecting member (3351b) and the second shaft (3210).

[0393] A preset section on the second drive shaft (3355b) facing the first drive housing (3310a) may be arranged inside the thrust support member (3400). The second drive shaft member (3350b) arranged inside the thrust support member (3400), specifically, the second drive shaft (3355b), may have a second extension member (3356b) formed to extend radially with respect to the rotation axis (AX1).

[0394] The second drive shaft (3355b) may include a second-first drive shaft (3355b1) and a second-second drive shaft (3355b2). The second-first drive shaft (3355b1) passes through the first drive shaft (3355a) and is connected to the second connecting member (3351b), and the second-second drive shaft (3355b2) connects the second drive body (3330b) and the second-first drive shaft (3355b1).

[0395] In the present invention, the 2-1 drive shaft (3355b1) is formed separately from the 2-2 drive shaft (3355b2), and is connected to the second connecting member (3351b) by penetrating the 1st drive shaft (3355a), but is not limited thereto and may be formed integrally with the 2-2 drive shaft (3355b2).

[0396] As an optional embodiment, the 2-1 drive shaft (3355b1) is provided in the first drive shaft portion (3350a) and can be arranged on the inside of the first drive shaft (3355a).

[0397] In the present invention, it is assumed that the 2-1 drive shaft (3355b1) is provided in the 2nd drive shaft section (3350b) and is connected to the 2-2 drive shaft (3355b2) to form the 2nd drive shaft (3355b).

[0398] On the inner side of the thrust support member (3400), one end (right end based on FIG. 18) of a 2-1 drive shaft (3355b1) and one end (left end based on FIG. 18) of a 2-2 drive shaft (3355b2) that are connected to face each other can be arranged, and a 2-1 extension (3356b1) and a 2-2 extension (3356b2) can be formed to extend radially from each end based on the rotation axis (AX1).

[0399] The 2-1 expansion part (3356b1) and the 2-2 expansion part (3356b2) can be connected to form the 2nd expansion part (3356b).

[0400] The second expansion portion (3356b) can be in contact with a plurality of support units (3431, 3435) to be described later, and a plurality of support units (3431, 3435) can be arranged on both sides (left and right sides based on FIG. 18) of the second expansion portion (3356b).

[0401] The second connecting member (3351b) may be formed in a tubular shape with openings on both sides and a hollow interior. A second shaft (3210) may be inserted into one side of the second connecting member (3351b), and a second drive shaft (3355b) may be inserted into the other side.

[0402] In the present invention, the second drive shaft (3355b) is inserted into the second connecting member (3351b), but this is not limited to this, and various modifications are possible, such as the second connecting member (3351b) being inserted into the second drive shaft (3355b).

[0403] Referring to FIG. 18 and FIG. 21, the thrust support member (3400) according to the present invention corresponds to the buffer member (31400) in the propulsion device (3100) according to the first embodiment, surrounds the first drive shaft member (3350a) and the second drive shaft member (3350b), and can simultaneously support the thrust generated from the front propeller member (3100) and the rear propeller member (3200) and transmit it to the hull (SB).

[0404] Specifically, one end of the first drive shaft (3355a) and a preset section of the second drive shaft (3355b) can be arranged inside the thrust support member (3400).

[0405] Referring to Fig. 18, the thrust support member (3400) can be positioned between the first drive housing (3310a) and the second drive housing (3310b). One side (lower side based on Fig. 18) of the thrust support member (3400) can be fixed to the hull (SB).

[0406] Accordingly, the power generated from the first driving body (3330a) and the second driving body (3330b) is transmitted to the first shaft (3110), the second shaft (3210), and the front propeller (3130) and the rear propeller (3230) through the first driving shaft portion (3350a) and the second driving shaft portion (3350b), and when the propulsive force is generated, it is transmitted to the hull (SB) and has the effect of supporting the load in the axial direction.

[0407] Referring to FIG. 18 and FIG. 21, the thrust support member (3400) may include a support housing member (3410), a support unit (3430), and a rotation support member (3450).

[0408] The support housing part (3410) is arranged on the hull (SB) and surrounds the first drive shaft part (3350a) and the second drive shaft part (3350b), and may include a first housing body (3411) and a second housing body (3415).

[0409] The support housing part (3410) is placed between the first drive housing (3310a) and the second drive housing (3310b), and one side (the lower side as shown in FIG. 18) can be fixed to the hull (SB).

[0410] The support housing part (3410) can be arranged on the hull (SB) to surround one end of the first drive shaft (3355a) facing the second drive housing (3310b) and a section set in advance on the second drive shaft (3355b), specifically, an area where the 2-1 drive shaft (3355b1) and the 2-1 drive shaft (3355b1) are connected.

[0411] Referring to FIGS. 19 to 21, the support housing portion (3410) has a hollow interior and can surround the first drive shaft (3355a) and the second drive shaft (3355b). The support housing portion (3410) can include a plurality of detachable housing bodies (3411, 3415).

[0412] Specifically, the support housing part (3410) may include a first housing body (3411) that surrounds one side (lower side as of FIG. 19) of the first drive shaft (3355a) and the second drive shaft (3355b), and a second housing body (3415) that surrounds the other side (upper side as of FIG. 19) opposite to the one side.

[0413] Although not shown in the drawing, the first housing body (3411) and the second housing body (3415) can be fastened using a fastening member such as a bolt.

[0414] Although not shown in the drawing, a bearing unit may be arranged in the first housing body (3411) and the second housing body (3415). The bearing unit may be arranged on an installation groove (drawing symbol not set) formed on each surface of the first housing body (3411) and the second housing body (3415) that are arranged facing each other.

[0415] There is an effect that the rotation of the first drive shaft (3355a) arranged inside the first housing body (3411) and the second housing body (3415) can be stably supported due to the bearing unit.

[0416] Referring to FIGS. 18 to 21, the support unit (3430) according to the present invention is arranged on the inside of the support housing portion (3410) so as to be in contact with the first drive shaft portion (3350a) and the second drive shaft portion (3350b), and can support the load in the axial direction of the first drive shaft portion (3350a) and the second drive shaft portion (3350b).

[0417] Specifically, the support unit (3430) shares a longitudinal central axis with the first drive shaft (3355a) and the second drive shaft (3355b), and can be arranged on the outside of the first drive shaft (3355a) and the second drive shaft (3355b).

[0418] The support unit (3430) can be arranged to surround one end of the first drive shaft (3355a) placed inside the support housing portion (3410).

[0419] The support unit (3430) can be arranged to surround a preset section of the second drive shaft (3355b) arranged inside the support housing portion (3410).

[0420] Referring to FIG. 18 and FIG. 21, a plurality of support units (3430) according to the present invention are provided, and can be spaced apart from each other along the longitudinal central axis (AX1) of the first drive shaft (3355a) provided in the first drive shaft portion (3350a) and the second drive shaft (3355b) provided in the second drive shaft portion (3350b).

[0421] The support unit (3430) may include a plurality of support unit (3430) bodies (drawing symbols not set) that can be fastened to each other. Referring to FIG. 19, in the process of installing the thrust support unit (3400), some of the plurality of support unit (3430) bodies may be installed on the support housing unit (3410), specifically, the first housing body (3411).

[0422] Referring to FIG. 20, before the second housing body (3415) is coupled to the first housing body (3411), the remaining bodies of the plurality of support units (3430) may be placed on the first drive shaft (3355a) and the second drive shaft (3355b), and then the second housing body (3415) may be placed.

[0423] The support unit (3430) includes a plurality of support unit (3430) bodies that are separable from each other, and since the plurality of support unit (3430) bodies can be fastened to each other, the support unit (3430) body having a shape in which one side is opened can be removed from the support housing part (3410) even without removing the first drive shaft (3355a) and the second drive shaft in the axial direction, thereby providing the effect of easy maintenance and repair. The support unit (3430) according to the present invention may be formed in a ring shape.

[0424] Referring to FIG. 21, the support unit (3430) according to the present invention may include a first support pad (3431) and a second support pad (3435) spaced apart from each other along the longitudinal central axis of the first drive shaft (3355a) and the second drive shaft (3355b).

[0425] The first support pad (3431) can simultaneously contact the first drive shaft (3355a) and the second drive shaft (3355b) and support a load in the direction of the rotation center axis (AX1) of the front propeller section (3100) and the rear propeller section (3200).

[0426] Referring to FIG. 21, the first support pad (3431) may be disposed between a first extension (3356a) that extends radially from one end of a first drive shaft (3355a) disposed inside a thrust support member (3400) based on a rotation center axis (AX1), and a second extension (3356b, 3356b1) that extends radially from a preset section of a second drive shaft (3355b) based on a rotation center axis (AX2).

[0427] That is, since the first support pad (3431) can contact the first extension (3356a) and the second extension (3356b) from the front and rear (left and right based on FIG. 21), respectively, it has the effect of simultaneously supporting the thrust (or axial load) of the first shaft (3110), which is the rotation axis of the front propeller (3130), and the second shaft (3210), which is the rotation axis of the rear propeller (3230).

[0428] Due to this, the first drive housing (3310a) and the second drive housing (3310b) have a preset gap, and a plurality of support members for supporting the axial load of the first shaft (3110) and the second shaft (3210) are not required, so the overall length of the shaft system of the propulsion device (300) can be reduced.

[0429] In addition, as the overall shaft length of the propulsion device (300) is reduced, there is an effect of securing additional cargo loading space.

[0430] Referring to FIG. 21, the second support pad (3435) according to the present invention is arranged between the first drive shaft (3355a) and the inner wall of the support housing part (3410), and between the second drive shaft (3355b) and the inner wall of the support housing part (3410), and can support a load in the direction of the rotation center axis (AX1) of the front propeller part (3100) and the rear propeller part (3200).

[0431] Referring to FIG. 21, the second support pad (3435) may be disposed between a first extension portion (3356a) that extends radially from one end of a first drive shaft (3355a) disposed inside a thrust support portion (3400) based on a rotation center axis (AX1) and an inner wall of a support housing portion (3410) facing the first extension portion (3356a).

[0432] In addition, the second support pad (3435) can be arranged between the second extension portion (3356b, 3356b2) that extends radially from the rotation center axis (AX2) in a preset section of the second drive shaft (3355b) and the inner wall of the support housing portion (3410) facing the second extension portion (3356b).

[0433] That is, the second support pad (3435) is in contact with the inner wall of the support housing part (3410) that is fixed to the first extension part (3356a) and the hull (SB) from the front and rear (left and right based on FIG. 21), and the inner wall of the support housing part (3410) that is fixed to the second extension part (3356b) and the hull (SB), thereby having the effect of simultaneously supporting the thrust (or axial load) of the first shaft (3110), which is the rotational axis of the front propeller (3130), and the second shaft (3210), which is the rotational axis of the rear propeller (3230).

[0434] Referring to FIG. 19 and FIG. 21, the rotation support member (3450) according to the present invention is disposed between the first drive shaft (3355a) and the second drive shaft (3355b), and specifically, can be disposed between the inner surface of the first drive shaft (3355a) and the outer surface of the second drive shaft (3355b).

[0435] The first drive shaft (3355a) and the second drive shaft (3355b) share a rotational center axis (AX1) and rotate in opposite directions. Since the rotation support member (3450) is arranged between the first drive shaft (3355a) and the second drive shaft (3355b), there is an effect of stably supporting the rotation of the first drive shaft (3355a) and the second drive shaft (3355b).

[0436] The propulsion device (300) according to the present invention has the effect of reducing the shaft length by simultaneously supporting the axial load of the first drive shaft (3355a) that transmits power to the first shaft (3110) and the second drive shaft (3355b) that transmits power to the second shaft (3210) by the thrust support member (3400) arranged between the first drive housing (3310a) and the second drive housing (3310b).

[0437] In addition, since each end of the first drive shaft (3355a) and the second drive shaft (3355b) is arranged inside the thrust support member (3400), a separate member for connecting the first drive shaft (3355a) and the second drive shaft (3355b) from the outside of the thrust support member (3400) is not required, so that the shaft length of the propulsion device (300) can be reduced.

[0438] In addition, since the support unit (3430) includes a plurality of detachable support unit (3430) bodies, there is an effect that the support unit (3430) can be maintained and repaired without removing the first shaft (3110), the first drive shaft (3355a), the second shaft (3210), and the second drive shaft (3355b) that form a rotation axis along the rotation center axis (AX1).

[0439] In addition, there is an effect of securing additional cargo loading space due to the reduced shaft length caused by simultaneously supporting the axial loads of the first shaft (3110) and the second shaft (3210) on a single thrust support member (3400).

[0440] Hereinafter, a ship propulsion device according to the fourth embodiment of the present invention will be described in detail.

[0441]

[0442] FIG. 10 is a schematic drawing of a vessel including a ship propulsion device according to embodiments of the present invention. FIG. 22 is an enlarged view of portion A of FIG. 10. FIG. 23 is an enlarged view of portion C of FIG. 22.

[0443] Referring to FIG. 10 and FIG. 22, a propulsion device for a ship according to the present invention (hereinafter referred to as a 'propulsion device (400)') generates propulsion force for a ship (1) on the sea, and can be located at the stern of a hull (SB).

[0444] The propulsion device (400) may include a front propeller section (4100), a rear propeller section (4200), a driving section (4300), and a rotation support section (4500).

[0445] A ship (1) can move on the sea by receiving power from a driving unit (4300) and by the rotational force generated from the front propeller unit (4100) and the rear propeller unit (4200).

[0446] Referring to FIG. 22, the front propeller unit (4100) is rotatable by receiving power from a driving unit (4300) to be described later, specifically, a first driving body unit (4330), and may include a first shaft (4110) and a front propeller (4130) having the first shaft (4110) as a rotation axis.

[0447] The front propeller section (4100) can rotate in the opposite direction to the rear propeller section (4200) to be described later. The first shaft (4110) forms the rotation axis of the front propeller (4130) and can be coupled to the front propeller (4130) which is positioned relatively forward (on the right side as shown in FIG. 22) compared to the rear propeller (4230).

[0448] The first shaft (4110) can be connected to a driving unit (4300) to be described later, specifically, a first driving shaft unit (4333).

[0449] When the first drive shaft part (4333) rotates due to the power generated from the first drive body (4331), the first shaft (4110) can rotate together with the rotation of the first drive shaft part (4333).

[0450] The first shaft (4110) shares a rotational center axis with the second shaft (4210) and can rotate independently of each other. That is, the first shaft (4110) can rotate in a direction opposite to the rotational direction of the second shaft (4210).

[0451] The first shaft (4110) is formed to extend along a longitudinal central axis and may be hollow internally. Accordingly, the second shaft (4210) may be inserted and positioned within the first shaft (4110) while sharing the central axis.

[0452] The front propeller (4130) is connected to the first shaft (4110) and can rotate in conjunction with the rotation of the first shaft (4110) as the first shaft (4110) rotates.

[0453] The front propeller (4130) shares a central axis of rotation with the rear propeller (4230) and can be spaced apart from the central axis of rotation.

[0454] In this specification, the first shaft (4110) and the second shaft (4210) that form the rotational center axes of the front propeller (4130) and the rear propeller (4230) are connected to the driving unit (4300) to be described later, and can rotate in opposite directions by receiving power generated from the driving unit (4300).

[0455] The front propeller (4130) is positioned relatively forward (to the right in Fig. 22) compared to the rear propeller (4230) and can rotate in the opposite direction to the rear propeller (4230).

[0456] Referring to FIG. 22, the rear propeller section (4200) can rotate in the opposite direction to the front propeller section (4100), and may include a second shaft (4210) and a rear propeller (4230).

[0457] The second shaft (4210) forms a rotation axis of the rear propeller (4230) which is positioned relatively rearward of the front propeller (4130), and can be connected to the driving unit (4300), specifically, the second driving body unit (4350).

[0458] The second shaft (4210) can be connected to the driving unit (4300), specifically, the second driving shaft unit (4353). When the second driving shaft unit (4353) rotates due to power generated from the second driving body (4351), the second shaft (4210) can rotate together with the rotation of the second driving shaft unit (4353).

[0459] When the second drive shaft part (4353) rotates due to the power generated from the second drive body part (4350), the second shaft (4210) can rotate together with the rotation of the second drive shaft part (4353).

[0460] The second shaft (4210) may be coupled to the second drive shaft portion (4353) by passing through the first shaft (4110). Referring to FIG. 22, the first shaft (4110) and the second shaft (4210) may share a longitudinal central axis (or rotational central axis).

[0461] The first shaft (4110) is hollow on the inside, and the second shaft (4210) can be arranged inside the first shaft (4110). As a result, the first shaft (4110) and the second shaft (4210) can have a structure in which they overlap in a preset section along the longitudinal central axis.

[0462] The rear propeller (4230) is connected to the second shaft (4210) and can rotate in conjunction with the rotation of the second shaft (4210) as the second shaft (4210) rotates.

[0463] The rear propeller (4230) shares a central axis of rotation with the front propeller (4130) and can be spaced apart from the central axis of rotation.

[0464] The first shaft (4110) and the second shaft (4210), which form the rotational center axes of the front propeller (4130) and the rear propeller (4230), are connected to a driving unit (4300) to be described later, and can rotate in opposite directions by receiving power generated from the driving unit (4300).

[0465] Referring to FIG. 22, a driving unit (4300) according to the present invention transmits power to a first shaft (4110) coupled with a front propeller (4130) and a second shaft (4210) coupled with a rear propeller (4230), and may include a driving housing (4310), a first driving body (4330), and a second driving body (4350).

[0466] Referring to Fig. 22, the driving unit (4300) generates power for propulsion and can be connected to the front propeller unit (4100) and the rear propeller unit (4200). In the present invention, the driving unit (4300) can generate power in the form of an electric motor.

[0467] However, it is not limited to this, and various modifications such as internal combustion engines and engines are possible within the technical concept of being able to transmit rotational power to the first shaft (4110) provided in the front propeller section (4100) and the second shaft (4210) provided in the rear propeller section (4200).

[0468] Referring to FIG. 22 and FIG. 23, the drive housing (4310) according to the present invention has a hollow interior and is positionally fixed to the hull, and can be formed as a single unit.

[0469] Referring to FIGS. 22 and 23, the drive housing (4310) can be fixed to the hull (SB) on one side (the lower side based on FIG. 23). Specifically, the drive housing (4310) can be inserted into and fixed in position in an installation groove (SBGR) formed in the shape of a groove and having a depth preset in the hull.

[0470] The drive housing (4310) according to the present invention is formed as a single unit, and can accommodate a first drive body part (4330) and a second drive body part (4350) in the internal space of the drive housing (4310).

[0471] That is, inside the drive housing (4310), a first drive body part (4330), specifically a first drive body (4331), and a second drive body part (4350), specifically a second drive body (4351), can be arranged together.

[0472] The first driving body (4331) and the second driving body (4351) can be spaced apart from each other based on the central axis of the rotational power generated from the driving unit (4300).

[0473] In this specification, the 'center axis of rotational power' means the 'drive shaft' of the drive unit (4300), and may be formed identically to the center axis of rotation of the first drive shaft unit (4333) that receives power from the first drive body unit (4330), specifically the first drive body (4331), rotates and is connected to the first shaft (4110), and the center axis of rotation of the second drive shaft unit (4353) that receives power from the second drive body unit (4350), specifically the second drive body (4351), rotates and is connected to the second shaft (4210).

[0474] Since the drive housing (4310) is formed as a single unit, there is an effect of simplifying the structure of the drive unit (4300) compared to a case where a plurality of drive housings are provided, and one of the plurality of drive housings accommodates the first drive main body (4330) and the other drive housing accommodates the second drive main body (4350).

[0475] In addition, since the drive housing (4310) is formed as a single unit, the central axis of the rotational power of the drive unit (4300), i.e., the overall length of the drive shaft, can be reduced. As the length of the central axis of the rotational power is reduced, there is an effect of securing free space inside the hull.

[0476] Although not shown in the drawing, a partition may be provided between the first driving body (4331) and the second driving body (4351) along the longitudinal direction of the driving shaft (left-right direction based on FIG. 23).

[0477] The bulkhead can divide the internal space of the drive housing (4310) where the first drive body (4331) and the second drive body (4351) are located into a plurality of regions along the longitudinal direction of the drive shaft (left-right direction based on FIG. 23).

[0478] As the partition wall divides the internal space of the drive housing (4310) into multiple areas, there is an effect of preventing heat generated during operation of the first drive body (4331) and the second drive body (4351) from being transmitted to each other.

[0479] In addition, there is an effect that can prevent the first driving body (4331) and the second driving body (4351) from interfering with each other and causing damage to the driving unit (4300) as they are driven.

[0480] Although not shown in the drawing, a thrust support member (not shown in the drawing) corresponding to the buffer member (1400) in the propulsion device (100) according to the first embodiment may be arranged on the outside of the drive housing (4310).

[0481] The thrust support unit is coupled to at least one of the first drive body unit (4330) and the second drive body unit (4350), and can support the thrust generated from the front propeller unit (4100) and the rear propeller unit (4200) and transmit it to the hull (SB).

[0482] As an optional embodiment, the thrust support member surrounds the second drive shaft member (4353), specifically the second drive shaft (4355), and can support the thrust generated from the rear propeller member (4200) and transmit it to the hull (SB).

[0483] Although not shown in the drawing, the thrust support member surrounds the first drive shaft section (4333), specifically the first drive shaft (4335), and supports the thrust generated from the forward propeller section (4100) and can transmit it to the hull (SB).

[0484] As an optional embodiment, a thrust support member that surrounds the first drive shaft (4335) and supports the thrust generated from the front propeller section (4100) may be positioned on the outside of the drive housing (4310). However, this is not limited to this, and various modifications are possible, such as being positioned and fixed within the drive housing (4310).

[0485] Referring to FIG. 22 and FIG. 23, inside the drive housing (4310), a first drive shaft (4335) and a second drive shaft (4355) can rotate along the drive shaft.

[0486] Referring to Fig. 23, the first driving body part (4330) transmits power to the first shaft (4110) and may include a first driving body (4331) and a first driving shaft part (4333). The first driving body (4331) generates rotational force in the first direction and may be connected to the first driving shaft part (4333).

[0487] The first driving body (4331) can receive power from an external source and generate rotational force within the driving housing (4310). The rotational force generated in the first driving body (4331) can be transmitted to the first shaft (4110) through the first driving shaft portion (4333).

[0488] The first driving body (4331) can be accommodated in the driving housing (4310) and can be rotatably arranged inside the driving housing (4310). The first driving body (4331) can include a stator (4331b) and a rotor (4331a). The rotor (4331a) can rotate relative to the stator (4331b) and generate rotational power.

[0489] Referring to FIG. 22 and FIG. 23, the first drive shaft portion (4333) is rotatable by receiving power generated from the first drive body (4331), and can transmit the power to the first shaft (4110).

[0490] Referring to FIG. 23, the first drive shaft portion (4333) may include a first connecting member (4334) and a first driving shaft (4335). The first connecting member (4334) is connected to the first shaft (4110), and the first driving shaft (4335) connects the first connecting member (4334) and the first driving body (4331), and may receive power from the first driving body (4331) to rotate the first connecting member (4334) and the first shaft (4110).

[0491] As an optional embodiment, one end (right end as shown in FIG. 22) of the first drive shaft (4335) located inside the drive housing (4310) is connected to a thrust support member (not shown in the drawing) and may be placed inside the thrust support member.

[0492] The first drive shaft (4335) is hollow on the inside, and thus, the second drive shaft portion (4353) to be described later, specifically, the second connecting member (4354) and the second drive shaft (4355) can pass through the first drive shaft (4335) and be coupled to the first shaft (4110). The first drive body (4331) can be rotatably arranged on the inside of a drive housing (4310) that is formed as a single unit together with the second drive body (4351).

[0493] The first connecting member (4334) may have a first-first contact portion (drawing symbol not specified) extending radially based on the longitudinal central axis of the first connecting member (4334).

[0494] On one side of the first drive shaft (4335) facing the first contact portion formed on the first connecting member (4334), a first-second contact portion (drawing symbol not set) may be formed extending in a radial direction based on the longitudinal central axis of the first drive shaft (4335).

[0495] The first contact portion and the first contact portion can be in radial contact with the drive shaft. Since the first contact portion and the first contact portion are joined by separate fastening members, there is an effect in which the first contact portion can be connected to the first shaft (4110) while the drive shaft is maintained.

[0496] Referring to FIG. 22, the second driving body (4351) generates a rotational force in a second direction opposite to the first direction, which is the rotational direction of the first driving body (4331), and can be connected to the second driving shaft portion (4353).

[0497] Referring to FIG. 23, the second driving body (4351) can be accommodated in the driving housing (4310) and can be rotatably positioned inside the driving housing (4310).

[0498] The second driving body (4351) can receive power from the outside and generate rotational force within the driving housing (4310).

[0499] The rotational force generated from the second driving body (4351) can be transmitted to the second shaft (4210) through the second driving shaft portion (4353), specifically, the second connecting member (4354) and the second driving shaft (4355).

[0500] The second driving body (4351) is housed in a driving housing (4310) formed as a single unit together with the first driving body (4331), and may include a stator (4351b) and a rotor (4351a). The rotor (4351a) rotates relative to the stator (4351b), and can generate rotational power.

[0501] Referring to FIG. 22 and FIG. 23, the second drive shaft portion (4353) is rotatable by receiving power generated from the second drive body (4351), and can transmit the power to the second shaft (4210). The second drive shaft portion (4353) may include a second connecting member (4354) and a second drive shaft (4355).

[0502] The second connecting member (4354) is connected to the second shaft (4210), and the second driving shaft (4355) connects the second connecting member (4354) and the second driving body (4351), and receives power from the second driving body (4351) to rotate the second connecting member (4354) and the second shaft (4210).

[0503] Referring to Fig. 22, the second connecting member (4354) is hollow on the inside and is open on both sides with respect to the longitudinal central axis, into which a second shaft (4210) can be inserted. Specifically, the second connecting member (4354) can be formed in a tubular shape with a hollow inside.

[0504] A second shaft (4210) can be inserted into one side (left side as shown in FIG. 22) of the second connecting member (4354), and a second driving shaft (4355) can be inserted into the other side (right side as shown in FIG. 22).

[0505] In the present invention, the second drive shaft (4355) is inserted into the second connecting member (4354), but this is not limited to this, and various modifications are possible, such as the second connecting member (4354) being inserted into the second drive shaft (4355).

[0506] Referring to FIG. 22 and FIG. 23, the rotation support member (4500) according to the present invention supports the rotation of the first drive shaft (4335) and the second drive shaft (4355), and can be arranged to surround the first drive shaft (4335) or the second drive shaft (4355).

[0507] The rotation support member (4500) according to the present invention can support a load in the radial direction based on the rotation center axis of the first drive shaft (4335) and the second drive shaft (4355). The rotation support member (4500) may be a journal bearing.

[0508] However, it is not limited to this, and within the technical concept of being able to support a load in the radial direction based on the rotational center axis of the first drive shaft (4335) and the second drive shaft (4355), the rotation support member (4500) can be formed into various modifications, such as being formed with a ball or roller bearing.

[0509] Referring to FIG. 22 and FIG. 23, the rotation support unit (4500) may include a first rotation support unit (4510) and a second rotation support unit (4550).

[0510] The first rotation support unit (4510) is positioned between the first drive shaft portion (4333), specifically the first drive shaft (4335), and the drive housing (4310), and can be fixed in position to the drive housing (4310).

[0511] This has the effect of allowing the first drive shaft (4335) to rotate stably inside the drive housing (4310).

[0512] Referring to FIG. 22 and FIG. 23, the second rotation support unit (4550) can be placed between the first drive shaft portion (4333), specifically the first drive shaft (4335), and the second drive shaft portion (4353), specifically the second drive shaft (4355).

[0513] The second rotation support unit (4550) shares a central axis with the first drive shaft (4335) and the second drive shaft (4355), and can be in contact with the inner surface of the first drive shaft (4335) and the outer surface of the second drive shaft (4355).

[0514] Since the second rotation support unit (4550) is arranged between the first drive shaft (4335) and the second drive shaft (4355), the rotational center axes of the first drive shaft (4335) and the second drive shaft (4355) can be maintained, and the first drive shaft (4335) and the second drive shaft (4355) can rotate stably.

[0515] Referring to FIGS. 22 and 23, a plurality of second rotation support units (4550) are provided, and can be spaced apart along the longitudinal direction of the drive shaft (left-right direction based on FIG. 23). The plurality of second rotation support units (4550) share a central axis and can be placed between the first drive shaft (4335) and the second drive shaft (4355).

[0516] Since a plurality of second rotation support units (4550) are spaced apart along the longitudinal direction of the drive shaft, there is an effect of stably supporting a load in the radial direction based on the rotation center axis of the first drive shaft (4335) and the second drive shaft (4355).

[0517]

[0518] Hereinafter, the configuration and effect of a propulsion device according to a modified example of the fourth embodiment of the present invention will be described.

[0519] Referring to FIG. 10 and FIG. 24, a propulsion device according to a modified example of the fourth embodiment of the present invention may include a front propeller section, a rear propeller section, a driving section (4300), a thrust support section (4400`), and a rotation support section (4500).

[0520] The propulsion device according to a modified example of the fourth embodiment of the present invention has a difference in the thrust support unit (4400`) compared to the propulsion device (400) according to the present invention, so the following description will focus on the thrust support unit (4400`).

[0521] Referring to FIG. 24, the thrust support unit (4400`) is coupled to the second driving body unit (4350) and may be positioned between the second driving body unit (4350) and the driving housing (4310). The thrust support unit (4400`) may include a thrust support housing (4410`) and a thrust support body (4450`).

[0522] Referring to Fig. 24, the thrust support housing (4410`) can be positionally fixed to the drive housing (4310) by penetrating the internal space and the external space of the drive housing (4310). The thrust support body (4450`) is arranged inside the thrust support housing (4410`) and can be connected to the second drive shaft portion (4353), specifically, the second drive shaft (4355).

[0523] Referring to FIG. 24, the thrust support body (4450`) can support the load in the axial direction of the second drive shaft (4355), and has the effect of supporting the thrust generated from the rear propeller section connected to the second drive shaft (4355) and transmitting it to the hull (SB).

[0524] Referring to FIG. 24, the thrust support member (4400`) can be spaced apart from the hull (SB) and positioned and fixed to the drive housing (4310).

[0525] As a result, compared to the case where the thrust support member (4400`) is installed on the outside of the drive housing (4310), the space occupied by the propulsion device is reduced in supporting the load in the direction of the drive shaft, and there is an effect of improving the space utilization, such as loading cargo inside the ship (1).

[0526] As an optional embodiment, the thrust support member (4400`) may be arranged between the first drive body member (4330), specifically the first drive shaft (4335) provided in the first drive shaft member (4333), and the drive housing (4310).

[0527] As a result, compared to the case where the thrust support member (4400`) is installed on the outside of the drive housing (4310), the space occupied by the propulsion device is reduced in supporting the load in the direction of the drive shaft, and there is an effect of improving the space utilization, such as loading cargo inside the ship (1).

[0528] The propulsion device according to a modified example of the fourth embodiment of the present invention has the same configuration and effect as the front propeller unit (4100), the rear propeller unit (4200), the drive unit (4300), and the rotation support unit (4500) of the propulsion device (400) according to one embodiment of the present invention, except that the thrust support unit (4400`) is arranged between the second drive shaft (4355) provided in the second drive main body unit (4350), specifically the second drive shaft unit (4353), and the drive housing (4310). Therefore, a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0529]

[0530] Hereinafter, the configuration, operating principle, and effect of a propulsion device according to another modified example of the fourth embodiment of the present invention will be described.

[0531] Referring to FIG. 10 and FIG. 25, a propulsion device according to another modified example of the fourth embodiment of the present invention may include a front propeller section, a rear propeller section, a driving section (4300), a thrust support section (4400``), and a rotation support section (4500).

[0532] The propulsion device according to another modified example of the fourth embodiment of the present invention has a difference in the thrust support unit (4400``) compared to the propulsion device according to the modified example described above, so the following description will focus on the thrust support unit (4400``).

[0533] Referring to Fig. 25, a plurality of thrust support members (4400``) may be provided. In this specification, the plurality of thrust support members (4400``) are defined as a first thrust support member (4410``) and a second thrust support member (4450``).

[0534] The first thrust support unit (4410``) is coupled to the second driving body unit (4350) and can be positioned between the second driving body unit (4350) and the driving housing (4310). The first thrust support unit (4410``) can include a first thrust support housing (4411``) and a first thrust support body (4415``).

[0535] Referring to FIG. 25, the first thrust support housing (4411``) can penetrate the internal space and external space of the drive housing (4310) and be positionally fixed to the drive housing (4310).

[0536] The first thrust support body (4415``) is arranged inside the first thrust support housing (4411``) and can be connected to the second drive shaft unit (4353), specifically, the second drive shaft (4355).

[0537] Referring to FIG. 25, the first thrust support body (4415``) can support the load in the axial direction of the second drive shaft (4355), and has the effect of supporting the thrust generated from the rear propeller section connected to the second drive shaft (4355) and transmitting it to the hull (SB).

[0538] Referring to FIG. 25, the first thrust support member (4410``) can be spaced apart from the hull (SB) and positioned and fixed to the drive housing (4310).

[0539] As a result, compared to the case where the first thrust support member (4410``) is installed outside the drive housing (4310), the space occupied by the propulsion device is reduced in supporting the load in the direction of the drive shaft, and there is an effect of improving space utilization such as loading cargo on the ship.

[0540] Referring to FIG. 25, the second thrust support member (4450``) is connected to the first driving body member (4330), and can be specifically connected to the first driving shaft (4335) provided in the first driving shaft member (4333).

[0541] The second thrust support member (4450``) may include a second thrust support housing (4451``) and a second thrust support body (4455``).

[0542] The second thrust support housing (4451``) can be positioned and fixed inside the drive housing (4310) to surround one end (right end based on FIG. 25) of the first drive shaft (4335).

[0543] This has the effect of supporting the thrust generated from the front propeller section and the rear propeller section together with the first thrust support section (4410``) and transmitting it to the hull (SB).

[0544] The second thrust support body (4455``) is arranged inside the second thrust support housing (4451``) and can be connected to the first drive shaft part (4333), specifically, the first drive shaft (4335).

[0545] Referring to FIG. 25, the second thrust support body (4455``) can support the load in the axial direction of the first drive shaft (4335), and has the effect of supporting the thrust generated from the forward propeller section connected to the first drive shaft (4335) and transmitting it to the hull (SB).

[0546] Referring to FIG. 25, the second thrust support member (4450``) can be spaced apart from the hull (SB) and positioned and fixed inside the drive housing (4310).

[0547] As a result, compared to the case where the second thrust support member (4450``) is installed outside the drive housing (4310), the space occupied by the propulsion device is reduced in supporting the load in the direction of the drive shaft, and space utilization such as loading ship cargo can be improved.

[0548] Referring to FIG. 25, an extension portion (4336) may be formed to extend in the radial direction at one end (the front end based on FIG. 25) of the first drive shaft portion (4333), specifically, the first drive shaft (4335).

[0549] The extension portion (4336) can be in contact with the second thrust support body (4455``) arranged inside the second thrust support housing (4451``). As a result, the second thrust support portion (4450``), specifically the second thrust support body (4455``), has the effect of stably supporting the axial load of the first drive shaft (4335) on both sides of the extension portion (4336).

[0550] A propulsion device according to another modified example of the fourth embodiment of the present invention has a plurality of thrust support members (4400``) and is connected to the first driving body member (4330) and the second driving body member (4350), respectively, and has the same configuration and effect as the propulsion device according to the modified example of the fourth embodiment of the present invention, including the front propeller member, the rear propeller member, the driving member (4300), and the rotation support member (4500), so a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0551] The propulsion device for a ship according to embodiments of the present invention has a first drive body part and a second drive body part that respectively transmit power to a front propeller part and a rear propeller part that rotate in opposite directions to generate propulsive force, and are accommodated in a drive housing formed as a single unit, thereby simplifying the structure of the drive body, reducing the overall size of the drive body, and reducing the length of the entire shaft that transmits power.

[0552] In addition, since the overall size of the driving unit and the length of the entire shaft transmitting power are reduced, the space occupied by the propulsion device is reduced compared to when the thrust support unit is installed outside the driving housing, thereby supporting the load in the direction of the driving shaft, and this has the effect of improving space utilization, such as loading ship cargo.

[0553] Hereinafter, a ship propulsion device according to the fifth embodiment of the present invention will be described in detail.

[0554]

[0555] Fig. 10 is a schematic drawing of a vessel including a propulsion device according to embodiments of the present invention. Fig. 26 is an enlarged view of part A of Fig. 10 to which a propulsion device according to the present invention is applied.

[0556] Referring to FIG. 10 and FIG. 26, a propulsion device (500) according to the present invention generates propulsion force for a ship (1) on the sea, and can be located at the stern of the hull (SB).

[0557] Referring to FIG. 26, the propulsion device (500) may include a front propeller section (5100), a rear propeller section (5200), a first driving section (5310), a second driving section (5350), and a shaft support member (5400).

[0558] A ship (1) can move on the sea by means of a front propeller unit (5100) and a rear propeller unit (5200) that receive power from a first driving unit (5310) and a second driving unit (5350) and rotate in opposite directions.

[0559] Referring to FIG. 26, the front propeller (5130) is rotatable by receiving power from the first driving unit (5310) to be described later, and may include a first shaft (5110) and a front propeller (5130).

[0560] The front propeller (5130) has a first shaft (5110) as a rotation axis (AX1) and can rotate together as the first shaft (5110) rotates.

[0561] The front propeller section (5100) can rotate in the opposite direction to the rear propeller section (5200) to be described later. The first shaft (5110) forms the rotation axis of the front propeller (5130) and can be coupled to the front propeller (5130) which is positioned relatively forward of the rear propeller (5230).

[0562] The first shaft (5110) is inserted and installed into an insertion hole (drawing symbol not set) formed in the hull, and can be inserted into a hollow shaft support member (5400) and enter the interior of the hull.

[0563] The first shaft (5110) can be connected to the first driving unit (5310), specifically, the first driving shaft (5317). When the first driving shaft unit (5315) rotates due to power generated from the first driving body (5313), the first shaft (5110) can rotate together with the rotation of the first driving shaft unit (5315).

[0564] The first shaft (5110) shares a rotational center axis (AX1) with the second shaft (5210), and can rotate independently of each other. That is, the first shaft (5110) receives power from the first driving unit (5310), and the second shaft (5210) receives power from the second driving unit (5350), and can rotate respectively.

[0565] At this time, the first shaft (5110) can rotate in the opposite direction to the rotation direction of the second shaft (5210).

[0566] The first shaft (5110) is formed to extend along a longitudinal central axis (AX1) and may be hollow internally. Accordingly, a second shaft (5210), which forms a rotational axis of a rear propeller (5230) within the first shaft (5110), may be inserted while sharing the central axis (AX1).

[0567] The front propeller (5130) is connected to the first shaft (5110) and can rotate together with the rotation of the first shaft (5110). The front propeller (5130) shares a rotational center axis (AX1) with the rear propeller (5230) and can be spaced apart from the rotational center axis.

[0568] The front propeller (5130) is positioned relatively forward (to the right in Fig. 26) compared to the rear propeller (5230) and can rotate in the opposite direction to the rear propeller (5230).

[0569] Referring to FIG. 26, the rear propeller unit (5200) according to the present invention is rotatable in the opposite direction to the front propeller unit (5100), and may include a second shaft (5210) and a rear propeller (5230).

[0570] The second shaft (5210) forms a rotation axis (AX1) of the rear propeller (5230) which is positioned relatively rearward of the front propeller (5130) and can be connected to the second drive shaft portion (5355).

[0571] When the second drive shaft part (5355) rotates due to the power generated from the second drive body (5353), the second shaft (5210) can rotate together with the rotation of the second drive shaft part (5355).

[0572] Referring to FIG. 26, the second shaft (5210) can pass through the first shaft (5110) and be coupled to the second drive unit (5350), specifically, the second drive shaft unit (5355).

[0573] Referring to FIG. 26, the second shaft (5210) can be connected to the second drive unit (5350) by passing through the first drive unit (5310) that transmits power to the first shaft (5110).

[0574] Due to this, there is no need for a separate coupling member connecting the first shaft (5110) and the second drive unit (5350), specifically the second drive shaft unit (5355), to the first drive unit (5310), so that the shaft length of the propulsion device (500) for the ship (1) can be reduced, and the overall structure can be simplified.

[0575] At this time, the second shaft (5210) can be coupled with the second connecting member (5356a) provided in the second driving unit (5350), specifically the second driving shaft unit (5355).

[0576] Referring to FIG. 26, the first shaft (5110) and the second shaft (5210) may share a longitudinal central axis (or rotational central axis) (AX1).

[0577] The first shaft (5110) is hollow on the inside, and the second shaft (5210) can be arranged inside the first shaft (5110). As a result, the first shaft (5110) and the second shaft (5210) can have an overlapping structure along the longitudinal central axis (AX1).

[0578] Referring to Fig. 26, the first driving unit (5310) according to the present invention generates power for propulsion and can be connected to the front propeller unit (5100). In the present invention, the first driving unit (5310) can generate power in the form of an electric motor.

[0579] However, it is not limited to this, and various modifications such as internal combustion engines and engines are possible within the technical concept of being able to transmit rotational power to the first shaft (5110) provided in the front propeller section (5100).

[0580] The first driving unit (5310) may include a first driving housing (5311), a first driving body (5313), a first driving shaft unit (5315), and a first thrust support unit (5319).

[0581] Referring to Fig. 26, the first drive housing (5311) accommodates the first drive body (5313) and the first drive shaft portion (5315), and can be placed on the ship body. The first drive housing (5311) has a hollow interior, and the first drive shaft (5317) can rotate along the rotation axis (AX1) inside the first drive housing (5311).

[0582] The first drive housing (5311) can be fixed to the hull (SB) on one side (the lower side as shown in FIG. 26). The first drive housing (5311) is spaced apart from the second drive housing (5351), and a first thrust support member (5319) can be placed between the first drive housing (5311) and the second drive housing (5351).

[0583] Referring to FIG. 26, the first driving body (5313) generates a rotational force in the first direction and can be connected to the first driving shaft portion (5315).

[0584] The first driving body (5313) can receive power from an external source and generate rotational force within the first driving housing (5311). The rotational force generated in the first driving body (5313) can be transmitted to the first shaft (5110) through the first driving shaft portion (5315).

[0585] The first driving body (5313) is accommodated in the first driving housing (5311) and may include a stator (53131a) and a rotor (5313b). The rotor rotates relative to the stator and may generate rotational power.

[0586] Referring to FIG. 26, the first drive shaft portion (5315) is rotatable by receiving power generated from the first drive body (5313), and can transmit the power to the first shaft (5110).

[0587] The first drive shaft portion (5315) may include a first connecting member (5316) and a first driving shaft (5317). The first connecting member (5316) is connected to the first shaft (5110), and the first driving shaft (5317) connects the first connecting member (5316) and the first driving body (5313), and may receive power from the first driving body (5313) to rotate the first connecting member (5316) and the first shaft (5110).

[0588] Referring to FIG. 26, the first connecting member (5316) can be connected by wrapping around one end (the right end based on FIG. 27) of the first shaft (5110), and an extension area can be formed in the radial direction of the one end of the first connecting member (5316) facing the first drive shaft (5317) based on the rotation axis (AX1).

[0589] The expansion region formed in the first connecting member (5316) can be combined with the first expansion portion (5318) formed in the first drive shaft (5317) by making surface contact. Accordingly, the rotation of the first drive shaft (5317) can be transmitted to the first shaft (5110) through the first connecting member (5316).

[0590] That is, the first connecting member (5316) is connected to the first shaft (5110), and the first driving shaft (5317) connects the first connecting member (5316) and the first driving body (5313), and receives power from the first driving body (5313) to rotate the first connecting member (5316) and the first shaft (5110).

[0591] Referring to Fig. 26, one end (right end based on Fig. 26) of the first drive shaft (5317) facing the second drive housing (5351) can be placed inside the first thrust support member (5319).

[0592] The first thrust support member (5319) supports the thrust generated from the front propeller member (5100) and transmits it to the rear propeller member (5200), specifically, the second shaft (5210), and can be connected to the first drive housing (5311).

[0593] From another perspective, the first thrust support unit (5319) can also be seen as transmitting the thrust generated from the forward propeller unit (5100) to the hull (SB).

[0594] Referring to FIG. 26, the first thrust support member (5319) is disposed between the first drive member (5310) and the second drive member (5350), and can be specifically connected to the first drive housing (5311) and disposed apart from the hull.

[0595] A support unit (5319a) is arranged in the first thrust support member (5319), and power generated in the first driving body (5313) is transmitted to the front propeller member (5100) due to the support unit (5319a), and when propulsive force is generated based on the rotation center axis (AX1), there is an effect of stably supporting the axial load.

[0596] Although not shown in the drawing, a bearing unit that supports the rotation of the second shaft (5210) and the first drive shaft (5317) may be arranged on the first thrust support member (5319).

[0597] The first drive shaft (5317) is hollow on the inside, and thus the second shaft (5210), which is coupled to the rear propeller (5230) to be described later, can pass through the first drive shaft (5317) and be coupled to the second drive shaft portion (5355).

[0598] Referring to Fig. 26, the second driving unit (5350) according to the present invention generates power for propulsion and can be connected to the rear propeller unit (5200). In the present invention, the second driving unit (5350) can generate power in the form of an electric motor.

[0599] However, it is not limited to this, and various modifications such as internal combustion engines and engines are possible within the technical concept of being able to transmit rotational power to the second shaft (5210) provided in the rear propeller section (5200).

[0600] The second driving unit (5350) may include a second driving housing (5351), a second driving body (5353), a second driving shaft unit (5355), and a first thrust support unit (5359).

[0601] Referring to Fig. 26, the second drive housing (5351) accommodates the second drive body (5353) and the first drive shaft portion (5355), and can be placed on the hull (SB). The second drive housing (5351) has a hollow interior, and the second drive shaft (5357) can rotate along the rotation axis (AX1) inside the second drive housing (5351).

[0602] The second drive housing (5351) can be fixed to the hull (SB) on one side (the lower side as shown in FIG. 26). The second drive housing (5351) is spaced apart from the first drive housing (5311), and a first thrust support member (5319) can be placed between the first drive housing (5311) and the second drive housing (5351).

[0603] Referring to FIG. 26, the second driving body (5353) generates a rotational force in a second direction opposite to the first direction, which is the rotational direction of the first driving body (5313), and can be connected to the second driving shaft portion (5355).

[0604] The second driving body (5353) generates a rotational force in a second direction opposite to the first direction, which is the rotational direction of the first driving body (5313), and can be connected to the second driving shaft portion (5355).

[0605] The second driving body (5353) can receive power from an external source and generate rotational force within the second driving housing (5351). The rotational force generated in the second driving body (5353) can be transmitted to the second shaft (5210) through the second driving shaft portion (5355).

[0606] The second driving body (5353) is accommodated in the second driving housing (5351) and may include a stator (5353a) and a rotor (5353b). The rotor (5353b) rotates relative to the stator (5353a) and may generate rotational power.

[0607] Referring to FIG. 26, the second drive shaft portion (5355) is rotatable by receiving power generated from the second drive body (5353), and can transmit power to the second shaft (5210).

[0608] The second drive shaft portion (5355) may include a second connecting member (5356a) and a second drive shaft (5357).

[0609] Referring to FIG. 26, the second connecting member (5356a) is connected to the second shaft (5210), and the second driving shaft (5357) connects the second connecting member (5356a) and the second driving body (5353), and receives power from the second driving body (5353) to rotate the second connecting member (5356a) and the second shaft (5210).

[0610] Referring to FIG. 26, the second connecting member (5356a) according to the present invention can surround the second shaft (5210) and be connected to the second shaft (5210). The second shaft (5210) can be inserted and connected to one side of the second connecting member (5356a), and the opposite side thereof can be connected to the second drive shaft (5357).

[0611] One end of the second connecting member (5356a) facing the second drive shaft (5357) may be formed with an extension region extending radially with respect to the rotational center axis (AX1). One end of the second drive shaft (5357) facing this may be formed with a second extension portion (5358) extending radially with respect to the rotational center axis (AX1).

[0612] The second extension portion (5358) of the second drive shaft (5357) and the expansion area of ​​the second connecting member (5356a) can be connected by making surface contact. Specifically, the second extension portion (5358) and the expansion area of ​​the second connecting member (5356a) can be connected by a fastening member such as a bolt, and the power generated in the second drive body (5353) can be transmitted to the second shaft (5210) through the second drive shaft (5357) and the second connecting member (5356a).

[0613] Referring to FIG. 26, a second shaft (5210) connected to a second connecting member (5356a) according to the present invention can transmit power to a rear propeller (5230) by passing through the first driving unit (5310).

[0614] Referring to Fig. 26, the second thrust support member (5359) is positioned on the outside of the second drive housing (5351), and one side (the lower side based on Fig. 26) can be fixed to the hull (SB).

[0615] The other end of the second drive shaft portion (5355) connected to the second shaft (5210) may be exposed to the outside of the second drive housing (5351) and may be connected to the second thrust support portion (5359). At least one support unit (5359a) may be arranged on the second thrust support portion (5359).

[0616] The support unit (5359a) can support the load in the axial direction of the second drive shaft portion (5355), specifically, the second drive shaft (5357). That is, the propulsive force generated from the second connecting member (5356a), the second shaft (5210), and the rear propeller (5230) connected to the second drive shaft (5357) can be effectively transmitted to the hull (SB).

[0617] In addition, the support unit (5359a) can effectively absorb and reduce vibration or shock applied in the direction of the rotation axis (AX1) as propulsion force is generated.

[0618] Referring to FIG. 26, a bearing unit (BU) may be arranged on the outside of the first drive housing (5311) to support the rotation of the first drive shaft portion (5315), specifically, the first drive shaft (5317). The bearing unit (BU) may be arranged between the first drive housing (5311) and the front propeller (5130).

[0619] Although not shown in the drawing, various modifications are possible, such as a bearing unit being arranged inside the first thrust support member (5319) to support the rotation of the first drive shaft (5317) and the second shaft (5210).

[0620] Referring to Fig. 26, a bearing unit (BU) may be arranged on the outside of the second drive housing (5351) to support the rotation of the second drive shaft portion (5355), specifically the second drive shaft (5357). A plurality of bearing units (BU) may be provided, and may be arranged on both the front and rear sides of the second drive housing (5351).

[0621] Referring to Fig. 26, the second thrust support member (5359) supports the thrust generated from the rear propeller member (5200) and transmits it to the hull (SB), and one side (the lower surface based on Fig. 26) can be fixed to the hull (SB).

[0622] A second drive shaft portion (5355), specifically one end of a second drive shaft (5357), can be inserted into the second thrust support portion (5359), and a support unit (5359a) can be arranged. The support unit (5359a) is connected to the second drive shaft (5357), and has the effect of stably supporting an axial load applied along the rotation axis (AX1) as the second drive portion (5350) generates power.

[0623] That is, when the power generated from the second driving unit (5350) is transmitted to the second shaft (5210) and the rear propeller (5230) due to the support unit (5359a), there is an effect of effectively absorbing and reducing vibration and shock generated when an axial load is applied in the direction of the rotation axis (AX1).

[0624] Fig. 27 is a drawing showing a modified example of the second connecting member in Fig. 26.

[0625] Referring to Fig. 27, compared to Fig. 26, a modified example of the second connecting member is illustrated. The second connecting member (5356b) is hollow on the inside and is open on both sides based on the longitudinal central axis (AX1), and a second shaft (5210) and a second drive shaft (5357) can be inserted on both sides.

[0626] Referring to Fig. 27, a second shaft (5210) may be inserted into one side (left side in Fig. 27) of the second connecting member (5356b) facing the rear propeller (5230), and a second drive shaft (5357) may be inserted into the opposite side (right side in Fig. 27).

[0627] However, it is not limited to this, and various modifications are possible, such as one side (left side as shown in FIG. 27) of the second connecting member (5356b) facing the rear propeller (5230) being inserted into the second shaft (5210), and the other side (right side as shown in FIG. 27) opposite thereto being inserted into the second drive shaft (5357).

[0628] Referring to Fig. 27, except that the second connecting member (5356b) is open on both sides and hollow on the inside, the configurations of the remaining front propeller part (5100), rear propeller part (5200), first driving part (5310), and shaft support member (5400) are the same, so detailed descriptions are omitted to the extent that they overlap.

[0629]

[0630] Hereinafter, a propulsion device according to a modified example of the fifth embodiment of the present invention will be described.

[0631] Fig. 28 is an enlarged view of part A of Fig. 10 to which a propulsion device according to a modified example of the fifth embodiment of the present invention is applied. Fig. 29 is a view illustrating a modified example of the second connecting member in Fig. 28.

[0632] Referring to FIG. 10, FIG. 28, and FIG. 29, the propulsion device (500`) may include a front propeller section (5100), a rear propeller section (5200), a first driving section (5310), a second driving section (5350), and a shaft support member (5400).

[0633] The propulsion device (500`) according to a modified example of the fifth embodiment of the present invention has a difference in the shaft support member (5400) compared to the propulsion device (500) according to the present invention, so only the differences in this regard will be described in detail.

[0634] Referring to FIG. 28, the shaft support member is arranged on the outer surface of the first shaft (5110), is arranged between the hull (SB) into which the first shaft (5110) is inserted, and the first shaft (5110), and can support the loads of the first shaft and the second shaft.

[0635] Specifically, the first shaft (5110) is inserted into an insertion hole (drawing symbol not set) formed in the hull (SB) and is inserted into a hollow shaft support member (5400), and can enter the interior of the hull (SB).

[0636] Referring to FIGS. 26 and 27, a ship in which a propulsion device (500) according to the present invention is installed has a relatively close distance between the insertion hole through which the first shaft (5110) is inserted into the hull (SB) and the bulkhead (BH) within the hull (SB0), so that the first shaft (5110) can be inserted into the bulkhead (BH) through the insertion hole with a single shaft support member (5400).

[0637] In contrast, Fig. 28 shows that the distance between the insertion hole into which the first shaft (5110) is inserted into the hull (SB) and the bulkhead (BH) inside the hull (SB) is relatively far, so that a plurality of shaft support members (5400) are provided, and a plurality of shaft support members (5400A, 5400B) can be inserted and installed in the insertion hole and the bulkhead (BH), respectively.

[0638] This has the effect of stably guiding the insertion path of the first shaft (5110), which is formed relatively long, preventing seawater, foreign substances, etc. from flowing between the first shaft (5110) and the hull (SB), and stably supporting the rotation of the front propeller section (5100) and the rear propeller section (5200).

[0639] Referring to FIG. 28, a propulsion device (500`) according to a modified example of the fifth embodiment of the present invention is provided with a plurality of shaft support members, and as the plurality of shaft support members (5400A, 5400B) are spaced apart from each other, the lengths of the first shaft (5110) and the second shaft (5210) can be relatively longer than those of the propulsion device (500) according to the present invention.

[0640] As the lengths of the first shaft (5110) and the second shaft (5210) increase, a taper section (5211) in which the diameter linearly decreases can be formed in a preset section of the second shaft (5210) to improve the fastening force between the second shaft (5210) and the second drive shaft portion (5355) and to ensure stable rotational movement.

[0641] A propulsion device (500`) according to a modified example of the fifth embodiment of the present invention has a plurality of shaft support members (5400), and the shaft length including the first shaft (5110) and the second shaft (5210) in which a tapered section (5211) is formed is extended overall, and therefore the remaining configuration is the same as that of the propulsion device (500) according to the present invention, and therefore, a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0642] Specifically, the second connecting member (5356a) of the propulsion device (500`) illustrated in FIG. 28 is identical to the second connecting member (5356a) of the propulsion device (500) illustrated in FIG. 26, and the second connecting member (5356b) of the propulsion device (500`) illustrated in FIG. 29 is identical to the second connecting member (5356b) of the propulsion device (500) illustrated in FIG. 27, so detailed descriptions thereof will be omitted as described above.

[0643] The propulsion device according to embodiments of the present invention has the effect of increasing the cargo loading space in the ship by reducing the overall length of the shaft system for generating propulsive force in the propulsion device, since the second shaft forming the rotation axis of the rear propeller is connected to the second drive unit by passing through the first drive unit.

[0644] In addition, since the second shaft is directly connected to the second drive unit, a separate coupling member provided in the first drive unit and for connecting the second drive unit and the second shaft is not required, which has the effect of reducing the overall length of the shaft system.

[0645] Additionally, as the overall length of the shaft system is reduced, the cargo loading space can be increased accordingly.

[0646]

[0647] Hereinafter, a ship propulsion device according to the sixth embodiment of the present invention will be described in detail.

[0648] FIG. 10 is a schematic drawing of a vessel including a vessel propulsion device according to embodiments of the present invention. FIG. 30 is a conceptual drawing of a vessel propulsion device (600) according to the present invention.

[0649] Referring to FIG. 10 and FIG. 30, a ship propulsion device (600) according to the present invention may include a front propeller (6100), a rear propeller (6200), a drive shaft support device (6300), a second shaft (6430), a first shaft (6420), and a drive unit (6600).

[0650] In the following description, the driving unit (6600) side is defined as the front, and the rear propeller (6200) side is defined as the rear, in comparison to the bow and stern of the ship.

[0651] A ship propulsion device (600) according to the present invention is a device that is installed at the aft (T) of a hull (SB) and converts power generated from a driving unit (6600) into rotational force in different directions in a shaft portion (6400) to generate propulsive force while a double-reversing propeller rotates in opposite directions. Here, the aft (T) of the hull (SB) may refer to a portion that protrudes in a streamlined manner toward the rear from the hull (SB) to support the shaft portion (6400) on which the double-reversing propeller is installed, i.e., a stern boss.

[0652] The driving unit (6600) may be installed inside the hull (SB) and may be connected to the front end of the driving shaft (6410) to generate power, for example, an engine, a motor, a turbine, etc., so as to generate thrust of a double-rotating propeller through the shaft portion (6400). Alternatively, the driving unit (6600) may include a power generation unit, a fuel cell, or an energy storage system (ESS).

[0653] The front propeller (6100) and the rear propeller (6200) are two counter-rotating propellers arranged one after the other with the same rotation axis in the direction of travel of the hull (SB), and their diameters are the same or one of the diameters is larger than that of the rear propeller (6200), and the blade tips of the front propeller (6100) are bent rearward so that the end of the front propeller (6100) wraps around the rear propeller (6200), thereby optimizing the blade shape of the propellers and improving efficiency. Alternatively, the diameter of the rear propeller (6200) is larger than that of the front propeller (6100), so that the turning cone generated by the front propeller (6100) can be fully utilized.

[0654] Additionally, the front propeller (6100) may be formed as a fixed pitch propeller (FPP) in which the propeller blades are fixed to a hub (6110) connected to a first shaft (6420), and the rear propeller (6200) may be formed as a controllable pitch propeller (CPP) in which the propeller blades are connected to a second shaft (6430) and the pitch angle (inclination of the propeller blades) can be adjusted.

[0655] These front propellers (6100) and rear propellers (6200) are connected to the first shaft (6420) and the second shaft (6430), respectively, and rotate in opposite directions, so that fuel is not wasted due to the rotational force generated in the wake of the front propeller (6100), and the rotational force flowing out from the front propeller (6100) can be recovered by the rear propeller (6200) rotating in the opposite direction to the front propeller (6100) and converted into propulsive force (straight-forward force).

[0656] The second shaft (6430) can extend from the rear propeller (6200) to the drive shaft (6410) of the drive unit (6600), and the hub (6210) of the rear propeller (6200) is coupled to the rear end and the drive shaft (6410) is coupled to the front end, thereby transmitting driving force to the rear propeller (6200).

[0657] The first shaft (6420) has a hollow shape into which the second shaft (6430) can be inserted, and can extend from the front propeller (6100) to a reverse rotation device (not shown) that transmits the power of the drive shaft (6410) to the first shaft (6420), and the hub (6110) of the front propeller (6100) is coupled to the rear end and the reverse rotation device is connected to the front end, so that the driving power can be transmitted to the front propeller (6100). However, the idea of ​​the present invention is not limited thereto, and it goes without saying that power can be directly transmitted to the first shaft (6420) by a separate driving unit or driving device without having a reverse rotation device.

[0658] In other words, a forward propeller (6100) is provided on the first shaft (6420) and is rotated in the forward direction by a driving unit (6600). In order for the first shaft (6420) and the second shaft (6430) to be provided with the same rotation axis, the first shaft (6420) is hollow, and the second shaft (6430) is provided inside the first shaft (6420), and the forward propeller (6100) is connected to the rear of the first shaft (6420) by a hub (6110). Here, a gap (G) may be formed inside the hub (6110) and between the hub and the second shaft (6430).

[0659] The second shaft (6430) may be spaced apart from the first shaft (6420) or the hub (6110) by a gap (G) at a predetermined distance and may be supported by a drive shaft support device (6300) to be described later and installed in the gap (G). In addition, the first shaft (6420) may be supported by a first shaft bearing part (not shown) installed between the first shaft and the hull (SB).

[0660] Meanwhile, the drive shaft support device (6300) can be placed in a space provided between the hub (6110) of the front propeller (6100) and the second shaft (6430).

[0661] The drive shaft support device (6300) may be installed between the hub (6110) and the second shaft (6430) and may act as an intermediary to enable the hub (6110) and the second shaft (6430) to support each other. In addition, the drive shaft support device (6300) may rotatably support the front propeller (6100) that is arranged concentrically with the second shaft (6430).

[0662] So far, the general configuration of the double-rotating propeller of the ship propulsion device (600) has been described. Below, the hub (6110) and the drive shaft support device (6300) of the front propeller (6100) will be described in detail.

[0663] Fig. 31 is an enlarged cross-sectional view of part D of Fig. 30, and Fig. 32 is a cross-sectional view showing a part of the drive shaft support device (6300) of Fig. 30.

[0664] Referring to FIGS. 30 to 32, the front portion of the hub (6110) according to the present invention is coupled with a first shaft (6420) so that the rotation of the first shaft (6420) can be transmitted to the rotation of the propeller blades. The outer circumferential surface of the hub (6110) may be provided with propeller blades (6142), and the drive shaft support device (6300) may be arranged in the inner space of the hub (6110) as described above.

[0665] The hub (6110) may be formed in a shape with an open rear end so that the drive shaft support device (6300) can be introduced from the rear to the front.

[0666] The space provided between the hub (6110) and the second shaft (6430) is configured to accommodate the second shaft (6430) and the drive shaft support device (6300). The hub (6110) may be formed such that its inner diameter becomes narrower from the rear to the front. To explain this from another perspective, the inner circumferential surface of the hub (6110) may be provided with a tapered surface (6111) that tapers in such a way that the inner diameter is reduced in the insertion direction of the drive shaft support device (6300).

[0667] A sealing unit (6120) may be provided between the hub (6110) of the front propeller (6100) and the hub (6210) of the rear propeller (6200). Specifically, the sealing unit (6120) may be disposed on the second shaft (6430) between the hub (6210) of the rear propeller (6200) and the drive shaft support device (6300) to be described later. Although not illustrated in the drawing, the sealing unit (6120) may form a sealing space between the liner fixing portion and the liner contact portion, divide the sealing space with a seal liner, and then fill the divided sealing space with a sealing medium to implement sufficient sealing. However, the spirit of the present invention is not limited thereto, and the sealing unit (6120) may of course be implemented in various ways. Through this, the sealing unit (6120) can prevent seawater or foreign substances from entering between the second shaft (6430) and the drive shaft support device (6300) from the outside.

[0668] The drive shaft support device (6300) according to the present invention may include a bearing unit (6310), a first bearing fixing part (6320), and a second bearing fixing part (6330).

[0669] The bearing unit (6310) is provided between the hub (6110) and the second shaft (6430) so that the second shaft (6430) can rotate smoothly inside the hub (6110) when the second shaft (6430) rotates. For example, the bearing unit (6310) can have various forms such as a roller bearing or a slide bearing, and since the hub (6110) also rotates, the bearing unit (6310) allows the second shaft (6430) to rotate smoothly in the opposite direction inside the rotating hub (6110).

[0670] The bearing unit (6310) may include an outer ring (6312), an inner ring (6311), and a roller (6313). Specifically, the inner ring (6311) may be positioned adjacent to the second shaft (6430), and the outer ring (6312) may be positioned facing the inner surface of the hub (6110). The bearing unit (6310) may employ a radial bearing as described above, but the spirit of the present invention is not limited thereto.

[0671] Meanwhile, the drive shaft support device (6300) may further include a bearing support (6340) disposed between the second shaft (6430) and the bearing unit (6310). The bearing support (6340) is inserted into the second shaft (6430) before the bearing unit (6310) is installed, and may assist in stably supporting the bearing unit (6310) by being inserted into the second shaft (6430). Specifically, the bearing support (6340) may support the bearing unit (6310) by coming into contact with the inner ring (6311) of the bearing unit (6310).

[0672] The first bearing fixing portion (6320) may be interposed between the bearing unit (6310) and the inner surface of the hub (6110). That is, the outer ring (6312) of the bearing unit (6310) may be in contact with the first bearing fixing portion (6320). Specifically, the first bearing fixing portion (6320) may include an inner support surface (6321) that is in contact with the outer ring (6312) of the bearing unit (6310) and a first tapered portion (6322) that is in contact with the second bearing fixing portion (6330) to be described later.

[0673] Here, the inner support surface (6321) of the first bearing fixing part (6320) can be described as the inner peripheral surface of the first bearing fixing part (6320), and the first tapered part (6322) can be described as the outer peripheral surface of the first bearing fixing part (6320).

[0674] In one embodiment, the first bearing fixing portion (6320) may be formed with a constant inner diameter in the insertion direction. To explain this from another perspective, the inner diameter of the first bearing fixing portion (6320) may be formed to correspond to the outer ring (6312) of the bearing unit (6310).

[0675] In addition, the first bearing fixing part (6320) may include a first tapered part (6322) whose outer diameter increases in the insertion direction. In other words, the first tapered part (6322) of the first bearing fixing part (6320) may have a shape in which the outer diameter increases from the rear end to the front end. From another perspective, the cross-sectional thickness of the first bearing fixing part (6320) may increase from the rear end to the front end. From another perspective, the first tapered part (6322) of the first bearing fixing part (6320) may become further from the outer surface of the outer ring (6312) from the rear end to the front end.

[0676] Meanwhile, the inner surface of the first bearing fixing part (6320) may be in contact with the outer surface of the outer ring (6312) of the bearing unit (6310), and the outer surface of the first bearing fixing part (6320) may be in contact with the inner surface of the second bearing fixing part (6330) to be described later.

[0677] Here, the outer surface of the first bearing fixing part (6320) and the inner surface of the second bearing fixing part (6330) can be formed in a shape corresponding to each other.

[0678]

[0679] Meanwhile, the second bearing fixing part (6330) may be disposed between the first bearing fixing part (6320) and the hub (6110). Specifically, the second bearing fixing part (6330) may be disposed between the first bearing fixing part (6320) and the inner peripheral surface of the hub (6110). Specifically, the inner peripheral surface of the second bearing fixing part (6330) may be in contact with the outer peripheral surface of the first bearing fixing part (6320), and the outer peripheral surface of the second bearing fixing part (6330) may be in contact with the inner peripheral surface of the hub (6110).

[0680] That is, the second bearing fixing part (6330) may be interposed between the first bearing fixing part (6320) and the hub (6110) and may be mutually supported by the first bearing fixing part (6320). In addition, the second bearing fixing part (6330) may be in contact with the inner circumferential surface of the hub (6110) and may be mutually supported by the hub (6110).

[0681] In one embodiment, the second bearing fixing portion (6330) may include a second tapered portion (6331) and a third tapered portion (6332) that are inclined in different directions in cross-section. For example, the second bearing fixing portion (6330) may be tapered so that its inner diameter increases in the insertion direction corresponding to the first bearing fixing portion (6320). To explain this from another perspective, the inner diameter of the second bearing fixing portion (6330) may be formed to correspond to the first tapered portion (6322) of the first bearing fixing portion (6320). In other words, the second tapered portion (6331) of the second bearing fixing portion (6330) may have a shape in which the inner diameter increases from the rear end to the front end.

[0682] The second bearing fixing portion (6330) may be tapered so that its outer diameter decreases in the insertion direction in correspondence with the inner surface of the hub (6110). To explain this from another perspective, the outer diameter of the second bearing fixing portion (6330) may be formed to correspond with the inner surface of the hub (6110). In other words, the third tapered portion (6332) of the second bearing fixing portion (6330) may have a shape in which its outer diameter decreases from the rear end to the front end.

[0683] From another perspective, the cross-sectional thickness of the second bearing fixing portion (6330) may decrease from the rear end to the front end. From another perspective, the outer and inner surfaces of the second bearing fixing portion (6330) may become closer to each other from the rear end to the front end.

[0684] The drive shaft support device (6300) according to the present invention has a first bearing fixing portion (6320) that does not directly contact the inner surface of the hub (6110), and therefore, the first bearing fixing portion (6320) may not pressurize the inner surface of the hub (6110). To explain this from another perspective, the first bearing fixing portion (6320) may not be pressed by the inner surface of the hub (6110).

[0685] On the other hand, the second bearing fixing part (6330) can come into contact with the inner surface of the first bearing fixing part (6320) and the hub (6110) to pressurize the first bearing fixing part (6320) and the hub (6110).

[0686] To explain this from another perspective, the second bearing fixing portion (6330) can be pressurized from the inner surface of the hub (6110). Additionally, the second bearing fixing portion (6330) can be pressurized from the first bearing fixing portion (6320).

[0687] As described above, the first bearing fixing part (6320) and the second bearing fixing part (6330) can be stably supported by each other by having tapered parts of corresponding shapes.

[0688] As will be described later, in the process of first installing the first bearing fixing part (6320) on the bearing unit (6310) and then installing the second bearing fixing part (6330), the first bearing fixing part (6320) and the second bearing fixing part (6330) are pressed against each other, and the first bearing fixing part (6320) and the bearing unit (6310) can also be pressed against each other. As a result, the bearing unit (6310) can be pressed toward the second shaft (6430) by the first bearing fixing part (6320) and the second bearing fixing part (6330) interposed between the hub (6110) and the second shaft (6430), and can be tightly fixed to the second shaft (6430).

[0689] In this way, the drive shaft support device (6300) according to the present invention has a first bearing fixing part (6320) and a second bearing fixing part (6330) that are inclined in different directions, so as to stably support a bearing unit (6310) disposed between a hub (6110) and a second shaft (6430).

[0690] Meanwhile, the drive shaft support device (6300) according to the present invention may further include a fastening member (6350) so that the second bearing fixing member (6330) can be fastened to the hub (6110).

[0691] The fastening member (6350) may be arranged across the rear end of the hub (6110) and the rear end of the second bearing fixing member (6330). That is, one area of ​​the fastening member (6350) may be arranged at the rear end of the hub (6110), and the other area may be arranged at the rear end of the second bearing fixing member (6330). In addition, one area of ​​the fastening member (6350) may be coupled to the hub (6110) by the bolt member, and the other area of ​​the fastening member (6350) may be coupled to the second bearing fixing member (6330) by the bolt member.

[0692] In one embodiment, the fastening member (6350) may be a semicircular plate-shaped member. That is, one fastening member (6350) may be positioned at the upper end relative to the second shaft (6430), and the other fastening member (6350) may be positioned at the lower end relative to the second shaft (6430). The fastening members (6350) divided in this manner may each connect the hub (6110) and the second bearing fixing member (6330) so that the second bearing fixing member (6330) is fixed to the hub (6110).

[0693] FIG. 33 is a cross-sectional view showing a part of a drive shaft support device (6300) according to a modified example of the sixth embodiment of the present invention.

[0694] Referring to FIG. 33, the drive shaft support device (6300) according to a modified example of the sixth embodiment of the present invention has a shape of the second bearing fixing part (6330) that is characteristically different from the drive shaft support device (6300) of the above-described embodiment.

[0695] A second bearing fixing part (6330) according to a modified example of the sixth embodiment of the present invention may include an extension part (6333) formed to extend radially from the rear end.

[0696] Specifically, the extension portion (6333) may be formed to extend in a direction away from the second shaft (6430). That is, the extension portion (6333) of the second bearing fixing portion (6330) may be formed in a flange shape that is bent from the body of the second bearing fixing portion (6330).

[0697] Accordingly, after the second bearing fixing part (6330) is inserted and positioned in the hub (6110), the extension part (6333) can be positioned to face the rear end of the hub (6110).

[0698] Here, the extension (6333) of the second bearing fixing member (6330) can be fastened to the rear of the hub (6110). Specifically, a portion of the extension (6333) can overlap with the rear end of the hub (6110). In addition, a portion of the extension (6333) that overlaps with the hub (6110) can be coupled to the hub (6110) by a bolt member.

[0699] That is, the bolt member can connect the hub (6110) and the second bearing fixing member (6330) so that the second bearing fixing member (6330) is fixed to the hub (6110).

[0700] Referring to FIG. 33, a fastening member (6360) may be placed between an extension (6333) formed in a second bearing fixing member (6330) and a hub (6110). A bolt member may be fastened to the hub (6110) by penetrating through the extension (6333) and the fastening member (6360).

[0701] Below, a method for installing a drive shaft support device (6300) installed between a hub (6110) and a second shaft (6430) will be described.

[0702] Figures 34 to 37 are cross-sectional views illustrating a step-by-step installation process of a drive shaft support device (6300) according to the present invention.

[0703] Referring to FIG. 34, the second shaft (6430) is inserted into the hub (6110) of the front propeller (6100), and the second shaft (6430) is provided with a bearing support (6340) and a bearing unit (6310) coupled to the outer surface of the bearing support (6340).

[0704] The first bearing fixing part (6320) is inserted while the bearing support part (6340) and the bearing unit (6310) are arranged in the space between the hub (6110) and the second shaft (6430). That is, the first bearing fixing part (6320) is arranged between the bearing unit (6310) and the inner surface of the hub (6110).

[0705] Here, as described above, the first bearing fixing part (6320) may be formed to have a constant inner diameter in the insertion direction. That is, the inner diameter of the first bearing fixing part (6320) may be formed to correspond to the outer ring (6312) of the bearing unit (6310). In addition, even if the first bearing fixing part (6320) is interposed, since a space exists between the first bearing fixing part (6320) and the hub (6110), when the first bearing fixing part (6320) is inserted, the bearing unit (6310) can minimize the load received from the first bearing fixing part (6320).

[0706] After the first bearing fixing part (6320) is installed, the second bearing fixing part (6330) is positioned between the first bearing fixing part (6320) and the inner surface of the hub (6110).

[0707] At this time, the second bearing fixing part (6330) can be guided along a path by the first bearing fixing part (6320). Specifically, the outer surface of the first bearing fixing part (6320) can be in contact with the inner surface of the second bearing fixing part (6330) to guide the second bearing fixing part (6330).

[0708] As described above, the first bearing fixing portion (6320) may include a first tapered portion (6322) whose outer diameter expands in the insertion direction, and the second bearing fixing portion (6330) may include a second tapered portion (6331) whose inner diameter expands in the insertion direction.

[0709] When the second bearing fixing part (6330) is inserted, the second tapered part (6331) can be inserted inward according to the shape of the first tapered part (6322) by sliding contact with the first tapered part (6322). In addition, the third tapered part (6332) facing the second tapered part (6331) of the second bearing fixing part (6330) can be in contact with the inner circumferential surface of the hub (6110).

[0710] At this time, the second bearing fixing part (6330) can pressurize the inner surface of the hub (6110) in a radial direction when moving into the inside of the hub (6110) along the axial direction of the second shaft (6430), and pressurize the first bearing fixing part (6320) in a radial direction toward the second shaft (6430).

[0711] Accordingly, the first bearing fixing part (6320) is pressed toward the second shaft (6430) by the second bearing fixing part (6330), and can pressurize the bearing unit (6310) in the radial direction. That is, the first bearing fixing part (6320) can tightly fix the bearing unit (6310) in the axial direction.

[0712] At this time, the bearing unit (6310) receives a vertical load from the first bearing fixing part (6320), but the load transmitted in the horizontal direction may be limited.

[0713] Meanwhile, when a bearing fixing part is inserted between the hub (6110) and the bearing unit (6310) to fix the bearing unit (6310), a load is transmitted horizontally to the bearing unit (6310) by the bearing fixing part, which may cause the roller or ball of the bearing unit (6310) to be damaged.

[0714] On the other hand, the drive shaft support device (6300) according to the present invention is provided with a first bearing fixing part (6320) and a second bearing fixing part (6330), so that the second bearing fixing part (6330) can be installed in stages after the first bearing fixing part (6320) is installed. In addition, as described above, the load transmitted horizontally to the bearing unit (6310) can be limited by the structural characteristics of the first bearing fixing part (6320) and the second bearing fixing part (6330).

[0715] Therefore, according to embodiments of the present invention, when installing a bearing unit (6310) in a hub (6110) of a front propeller (6100), a drive shaft support device (6300) can be provided that prevents damage to the bearing unit (6310) and allows the bearing unit (6310) to be stably installed within the hub (6110).

[0716]

[0717] Hereinafter, a bearing device that can be installed in a ship propulsion device according to the seventh embodiment of the present invention will be described in detail.

[0718]

[0719] FIG. 10 is a schematic drawing of a vessel including a propulsion device for a vessel in which a bearing device according to embodiments of the present invention is installed. FIG. 38 is an enlarged view of portion A of FIG. 10. FIG. 39 is a perspective view illustrating a bearing device according to the present invention. FIG. 40 is a drawing illustrating a state in which a bearing body, a snap part, and a movable part according to the present invention are separated. FIG. 41 is a partially enlarged drawing of an area in which a snap part and a movable part according to the present invention are combined. FIG. 42 is a plan view illustrating a bearing body according to the present invention and a snap part adjusted on the bearing body. FIG. 43 and FIG. 44 are drawings illustrating a state in which an external force is transmitted by a movable part according to the present invention and a snap part is adjusted on the bearing body.

[0720] Referring to FIG. 10 and FIG. 38, a bearing device (7200) according to the present invention can be installed in a propulsion device (700) that generates propulsion force for a ship (71) on the sea, specifically, a propulsion unit (7100). The propulsion unit (7100) can be located at the stern of the ship.

[0721] Referring to FIG. 38, the propulsion unit (7100) may include a front propeller unit (7110), a rear propeller unit (7130), and a driving unit (not shown in the drawing). The ship (71) receives power from the driving unit (not shown in the drawing) and can move on the sea by the rotational force generated from the front propeller unit (7110) and the rear propeller unit (7130).

[0722] In the present invention, the driving unit can generate power using an electric motor. However, this is not limited to this, and various modifications, such as an internal combustion engine or engine, are possible within the technical concept of transmitting rotational power to the front propeller unit (7110) and the rear propeller unit (7130).

[0723] As an optional embodiment, the driving unit may be formed as a single unit and may simultaneously transmit power to the front propeller unit (7110) and the rear propeller unit (7130). At this time, the rotational forces generated in the front propeller unit (7110) and the rear propeller unit (7130) may have opposite directions.

[0724] In other words, the front propeller (7115) and the rear propeller (7135) can rotate in opposite directions.

[0725] As an optional embodiment, a plurality of driving units are provided, and power can be transmitted to the front propeller unit (7110) and the rear propeller unit (7130), respectively.

[0726] Referring to FIG. 38, the front propeller section (7110) may include a first shaft (7111) and a front propeller (7115). The rear propeller section (7130) may include a second shaft (7131) and a rear propeller (7135).

[0727] The first shaft (7111) and the second shaft (7131) are connected to the driving unit and can rotate by receiving power from the driving unit, and the first shaft (7111) and the second shaft (7131) can transmit the power received from the driving unit to the front propeller (7115) and the rear propeller (7135), respectively.

[0728] The forward propeller (7115) may be positioned relatively forward (to the right as shown in Fig. 38) compared to the rear propeller (7135). In this specification, the forward side means the bow side of the hull.

[0729] Referring to FIG. 38, the first shaft (7111) may share a longitudinal central axis and a rotational central axis with the second shaft (7131). The first shaft (7111) and the second shaft (7131) may be arranged to overlap each other. Specifically, the second shaft (7131), which is connected to the rear propeller (7135), may be arranged inside the first shaft (7111), which is connected to the front propeller (7115).

[0730] Specifically, the first shaft (7111) is formed with a hollow interior, and the second shaft (7131) can be inserted through the first shaft (7111).

[0731] Referring to Fig. 38, a bearing device (7200) to be described later may be arranged between the first shaft (7111) and the second shaft (7131). The bearing device (7200) may be arranged at a preset position along the longitudinal direction of the first shaft (7111) and the second shaft (7131). That is, the bearing device (7200) may be arranged on the second shaft (7131) between the front propeller (7115) (or the rear propeller (7135)) and the driving unit.

[0732] Looking at this from another perspective, the bearing device (7200) can be arranged in surface contact between the outer surface of the second shaft (7131) and the inner surface of the first shaft (7111).

[0733] Since the bearing device (7200) is placed between the first shaft (7111) and the second shaft (7131), there is an effect of stably aligning the shafts between the first shaft (7111) and the second shaft (7131) having a dual shaft structure.

[0734] In addition, since a bearing device (7200) is arranged between the first shaft (7111) and the second shaft (7131), the rotation of the first shaft (7111) and the second shaft (7131) can be stably supported, and there is an effect of ensuring stability against vibrations occurring in the propulsion unit (7100).

[0735] Referring to FIGS. 38 to 42, a bearing device (7200) according to the present invention is disposed between a first shaft (7111) connected to a propulsion unit (7100), specifically a front propeller (7115), and a second shaft (7131) connected to a rear propeller (7135), and may include a bearing body (7210), a snap unit (7230), and a movable unit (7250).

[0736] In the present invention, what is arranged between the first shaft (7111) and the second shaft (7131) is a bearing body (7210) and a snap part (7230), and the movable part (7250) transmits an external force to the snap part (7230) to arrange the bearing body (7210) and the snap part (7230) at a preset position on the propulsion part (7100), specifically, the second shaft (7131), and can be spaced apart from the snap part (7230).

[0737] That is, what is ultimately positioned on the second shaft (7131) is the bearing body (7210) and the snap part (7230).

[0738] Referring to FIGS. 38 to 42, the bearing body (7210) has a shaft hole (7211) formed therein through which a second shaft (7131) connected to a propeller for a ship (71), specifically a rear propeller (7135), can pass, and can support rotation of the second shaft (7131).

[0739] Referring to FIGS. 38 to 42, the bearing body (7210) is conceptually illustrated, but the bearing body (7210) may include an inner ring and an outer ring that are capable of relative rotation.

[0740] The bearing body (7210) according to the present invention may be a ball bearing. However, it is not limited thereto, and various modifications such as a journal bearing or roller bearing are possible within the technical concept that the second shaft (7131) can pass through and can support the axial loads of the first shaft (7111) and the second shaft (7131).

[0741] Referring to FIG. 38, the outer surface of the bearing body (7210) can be in contact with the inner surface of the first shaft (7111) connected to the rear propeller (7135), and the inner surface of the bearing body (7210) can be in contact with the outer surface of the second shaft (7131) connected to the front propeller (7115).

[0742] The bearing body (7210) can be connected to a snap part (7230) to be described later, and can move on a second shaft (7131) by receiving an external force from a movable part (7250) while the bearing body (7210) and the snap part (7230) are connected.

[0743] That is, the second shaft (7131) can pass through the shaft hole (7211) formed in the bearing body (7210), and the bearing body (7210) and the snap part (7230) can move on the second shaft (7131).

[0744] The shaft hole portion (7211) formed in the bearing body (7210) can overlap with the snap portion (7230) in a predetermined area.

[0745] The width of the overlapping area between the shaft hole portion (7211) and the snap portion (7230) can be adjusted by an external force transmitted to the snap portion (7230) from the movable portion (7250) to be described later, and as the overlapping area increases, the snap portion (7230) can be fixed in position by pressing the second shaft (7131).

[0746] Referring to FIGS. 39 to 42, a hooking portion (7213) may be formed to protrude outwardly, specifically toward the snap portion (7230), on one side of the bearing body (7210) facing the snap portion (7230). A connecting portion (7235) provided on the snap portion (7230) may be connected to the hooking portion (7213) by wrapping around it.

[0747] The catch (7213) according to the present invention may be formed in a cylindrical shape. However, it is not limited thereto, and various modifications, such as a square pillar, are possible within the technical concept of making contact with the connecting portion (7235) and providing a movement path for the connecting portion (7235).

[0748] A plurality of catches (7213) may be provided. The plurality of catches (7213) may be spaced apart from each other and facing each other based on the center of the shaft hole (7211). A plurality of connecting parts (7235) may also be provided to correspond to the plurality of catches (7213).

[0749] The catch (7213) is formed to extend along the longitudinal direction and may have an extension (7213a) whose diameter expands in the radial direction in a section preset along the longitudinal central axis.

[0750] The cross-sectional area based on the longitudinal central axis of the hanging portion (7213) can be formed so that the expanded portion (7213a) is relatively larger than the area excluding the expanded portion (7213a).

[0751] As a result, the extension (7213a) is arranged on the movement path of the connection (7235) that is arranged to surround the catch (7213), and since the connection (7235) is located between the bearing body (7210) facing the snap (7230) and the extension (7213a), there is an effect of preventing the snap (7230) having the connection (7235) from being separated from the bearing body (7210).

[0752] In addition, there is an effect that can improve the fastening force between the bearing body (7210) and the snap part (7230).

[0753] Referring to FIGS. 38 to 44, a snap portion (7230) according to the present invention is connected to a bearing body (7210) and can overlap with a shaft hole portion (7211). The snap portion (7230) may include a snap body (7231) and a connecting portion (7235).

[0754] The snap portion (7230) is formed of a material capable of elastic deformation, and can receive an external force to adjust the area of ​​overlap with the shaft hole portion (7211) and pressurize the second shaft (7131). Specifically, the shaft is pressed in a direction in which the area of ​​overlap with the shaft hole portion (7211) increases, and can be fixed at a preset position on the second shaft (7131).

[0755] Since the snap part (7230) is connected to the bearing body (7210), the snap part (7230) and the bearing body (7210) are not respectively placed on the second shaft (7131), but can move on the second shaft (7131) in a connected state and be placed at a preset position.

[0756] That is, in order to limit the movement of the bearing body (7210) along the longitudinal direction (left-right direction based on FIG. 38) of the second shaft (7131), rather than first installing the bearing body (7210) and then separately installing the snap part (7230), the bearing body (7210) and the snap part (7230) can be moved and positionally fixed together on the second shaft (7131), thereby improving the convenience of installation of the bearing device (7200).

[0757] Referring to FIGS. 40 to 42, the snap body (7231) can be formed to extend and have a radius of curvature preset to surround the outer surface of the second shaft (7131) passing through the shaft hole (7211).

[0758] Referring to FIG. 40 and FIG. 42, the snap body (7231) is formed of a material capable of elastic deformation and can be deformed in shape by receiving an external force. The snap body (7231) has two ends spaced apart from each other, and the distance between the two ends of the snap body (7231) can be adjusted by an external force.

[0759] Both ends of the snap body (7231) can be connected to the movable part (7250) to be described later, and the distance between the both ends of the snap body (7231) can be adjusted by receiving external force from the movable part (7250).

[0760] The snap body (7231) can be arranged to surround the outer surface of the second shaft (7131), and when the distance between the two ends of the snap body (7231) increases, some areas are released from contact with the second shaft (7131), and the bearing body (7210) and the snap body (7231) can move on the second shaft (7131).

[0761] Referring to Fig. 42, in the 'basic state' where no external force is transmitted to both ends of the snap body (7231), the inner diameter of the snap body (7231) can be formed relatively smaller than the diameter of the second shaft (7131).

[0762] Accordingly, in order for the snap body (7231) to move on the second shaft (7131), an external force must be transmitted from the movable part (7250) so that the distance between the two ends of the snap body (7231) increases.

[0763] That is, an external force is transmitted to the snap body (7231), the distance between the two ends of the snap body (7231) increases, and then when the external force is removed and the snap body (7231) returns to the ‘basic state’, the snap body (7231) can pressurize the second shaft (7131).

[0764] A fastening hole (7231h) may be formed through both ends of the snap body (7231). A fastening projection (7252a, 7256a) protruding from the movable part (7250) to be described later may be fastened to the fastening hole (7231h). Since the fastening projections (7252a, 7256a) are fastened to the fastening hole (7231h), an external force is transmitted from the movable part (7250) to the snap body (7231), thereby adjusting the distance between the both ends of the snap body (7231).

[0765] In the present invention, a fastening hole (7231h) is formed through the snap body (7231) and a fastening projection (7252a, 7256a) is provided in the movable part (7250), but this is not limited to this and various modifications are possible, such as a fastening projection is provided in the snap body (7231) and a fastening hole is formed through the movable part (7250).

[0766] Referring to FIGS. 40 to 42, a connecting portion (7235) according to the present invention is coupled to a snap body (7231), and can connect the snap body (7231) and the bearing body (7210). The connecting portion (7235) can be formed integrally with the snap body (7231).

[0767] The connecting portion (7235) may be formed in a ring shape, and both ends may be connected to the snap body (7231). A plurality of connecting portions (7235) may be provided, and may be connected to each of both sides of the snap body (7231).

[0768] The connecting portion (7235) may be formed as a curved surface in a preset section and may be hung on a hook portion (7213) that is protruded from the bearing body (7210). By hanging the connecting portion (7235) on the hook portion (7213), the connecting portion (7235) and the snap body (7231) coupled to the connecting portion (7235) can be prevented from being separated from the bearing body (7210).

[0769] In addition, when the distance between the two ends of the snap body (7231) is adjusted, the connecting portion (7235) can move while being caught on the hook portion (7213). Specifically, when the distance between the two ends of the snap body (7231) increases, the plurality of connecting portions (7235) can move in a direction away from each other, and when the distance between the two ends of the snap body (7231) decreases, the plurality of connecting portions (7235) can move in a direction closer to each other.

[0770] The distance from the center of the catch (7213) to the inner surface of the connecting portion (7235) can be formed to be relatively smaller than the distance from the center of the catch (7213) to the expansion portion (7213a). This has the effect of preventing the snap portion (7230) having the connecting portion (7235) along the longitudinal direction (left-right direction based on FIG. 38) of the second shaft (7131) from being separated from the bearing body (7210).

[0771] Referring to FIGS. 39 to 41, 43, and 44, the movable part (7250) according to the present invention is capable of being fastened to the snap part (7230), and can change (or adjust) the area of ​​the overlapping area between the snap part (7230) and the shaft hole part (7211) by transmitting power (or external force) to the snap part (7230).

[0772] Referring to FIGS. 40 and 41, the movable part (7250) may include a first movable body (7251) and a second movable body (7255). The first movable body (7251) extends in the longitudinal direction and is hollow inside. The second movable body (7255) shares a longitudinal central axis (AX1) with the first movable body (7251) and is insertable into the interior of the first movable body (7251).

[0773] That is, the first movable body (7251) and the second movable body (7255) can be arranged to overlap each other along the longitudinal central axis (AX1). The first movable body (7251) and the second movable body (7255) can rotate relative to each other based on the longitudinal central axis (AX1).

[0774] The first movable body (7251) and the second movable body (7255) are respectively connected to both ends of the snap body (7231), and the distance between the both ends of the snap body (7231) can be adjusted as the first movable body (7251) and the second movable body (7255) rotate relative to each other.

[0775] In the present invention, the first movable body (7251) and the second movable body (7255) are rotated in opposite directions, but this is not limited to the technical concept of the first movable body (7251) and the second movable body (7255) rotating relative to each other. Various modifications are possible, such as fixing the position of one of the first movable body (7251) and the second movable body (7255) and rotating the other.

[0776] Although not shown in the drawing, the movable part (7250) is connected to the first movable body (7251) and the second movable body (7255) and may include a driving unit that transmits power. The driving unit receives power from an external source and transmits power to the first movable body (7251) and the second movable body (7255) to cause the first movable body (7251) and the second movable body (7255) to rotate relative to each other.

[0777] As an optional embodiment, even without a driving source such as a driving unit, the user can directly rotate the first movable body (7251) and the second movable body (7255) relative to each other.

[0778] Referring to FIG. 40, a first fastening portion (7252) that can be fastened to a portion of the snap portion (7230) can be protrudingly formed on one side of the first movable body (7251) facing the snap portion (7230), and a second fastening portion (7256) that can be fastened to a portion of the snap portion (7230) that is spaced apart from the portion of the snap portion (7230) that is fastened to the first fastening portion (7252) can be protrudingly formed on one side of the second movable body (7255) facing the snap portion (7230).

[0779] The first fastening portion (7252) and the second fastening portion (7256) may each have fastening projections (7252a, 7256a) that can be inserted into a plurality of fastening holes (7231h) provided in the snap body (7231).

[0780] Referring to FIG. 40, the fastening projection (7252a) provided in the first fastening portion (7252) can be inserted into and fastened to a fastening hole (7231h) formed in one of the two ends of the snap body (7231), and the fastening projection (7256a) provided in the second fastening portion (7256) can be inserted into and fastened to a fastening hole (7231h) formed in the other of the two ends of the snap body (7231).

[0781] As the first movable body (7251) and the second movable body (7255) rotate relative to each other, the distance between the fastening projection (7252a) protruding from the first fastening portion (7252) and the fastening projection (7256a) protruding from the second fastening portion (7256) is adjusted, and the distance between the two ends of the snap body (7231) that are fastened to the first fastening portion (7252) and the second fastening portion (7256) can be adjusted.

[0782] The first movable body (7251) and the second movable body (7255) share a longitudinal central axis (AX1), and the distance between the two ends of the snap body (7231) can be adjusted by relative rotation about the longitudinal central axis (AX1) as the rotational center axis.

[0783] As the distance between the two ends of the snap body (7231) increases, the area of ​​the inner region surrounded by the snap body (7231) increases, and the area of ​​the overlapping region with the shaft hole portion (7211) formed in the bearing body (7210) decreases.

[0784] From another perspective, some of the inner areas of the snap body (7231) may be released from contact with the second shaft (7131), and the second shaft (7131) may not be pressed. At this time, the user may move the bearing body (7210) and the snap part (7230) along the longitudinal direction (left-right direction based on FIG. 38) on the second shaft (7131) while the movable part (7250) and the snap part (7230) are connected.

[0785] Referring to FIGS. 40, 41, 43, and 44, a first mounting portion (7253) on which a catch portion (7213) can be mounted is formed protrudingly in the first movable body (7251), and a second mounting portion (7257) on which a catch portion (7213) can be mounted protrudingly is formed on the second movable body (7255) so as to face the first mounting portion (7253).

[0786]

[0787] The first anchoring portion (7253) and the second anchoring portion (7257) can be arranged facing each other with the catch portion (7213) between them.

[0788] The first mounting portion (7253) and the second mounting portion (7257) may have steps and may each be formed with a hooking groove (drawing symbol not specified). An extension portion (7213a) provided on a hooking portion (7213) that is formed to protrude from the snap body (7231) may be hung on the hooking grooves formed on the first mounting portion (7253) and the second mounting portion (7257).

[0789] From another perspective, the gap groove portion may be formed in a step shape, with the distance from the longitudinal center axis changing along the longitudinal direction in the first anchor portion (7253) and the second anchor portion (7257).

[0790] The first anchoring portion (7253) and the second anchoring portion (7257) may be provided in multiple numbers to correspond to multiple catch portions (7213).

[0791] A plurality of first fixing portions (7253) can be arranged symmetrically with respect to the longitudinal central axis (AX1) of the first movable body (7251), and a plurality of second fixing portions (7257) can be arranged symmetrically with respect to the longitudinal central axis (AX1) of the second movable body (7255).

[0792] Referring to Fig. 43, the first fixing portion (7253) and the second fixing portion (7257) can be arranged facing each other with one of the plurality of catch portions (7213) interposed therebetween.

[0793] A first mounting portion (7253) protrudingly formed on a first movable body (7251) and a second mounting portion (7257) protrudingly formed on a second movable body (7255) can be arranged to face each other with a catch portion (7213) therebetween. The distance between the first mounting portion (7253) and the second mounting portion (7257) from the center of the catch portion (7213) can be adjusted as the first movable body (7251) and the second movable body (7255) rotate relative to each other.

[0794] Referring to FIG. 43 and FIG. 44, when the first fastening portion (7252) and the second fastening portion (7256) provided on the first movable body (7251) and the second movable body (7255) are respectively inserted and fastened into the fastening holes (7231h) formed at both ends of the snap body (7231) and the first movable body (7251) and the second movable body (7255) are relatively rotated, the distance between the first fastening portion (7252) and the second fastening portion (7256) becomes spaced apart, while the distance between the first fixing portion (7253) and the second fixing portion (7257) becomes close.

[0795] As the first anchoring portion (7253) and the second anchoring portion (7257) come close to each other, one side of the expansion portion (7213a) provided in the catch portion (7213) can be hung on the first anchoring portion (7253), and the other side opposite thereto can be hung on the second anchoring portion (7257).

[0796] As a result, the width of the inner region of the snap body (7231) is increased, and the first fixing portion (7253) and the second fixing portion (7257) are fastened by wrapping around the expansion portion (7213a) provided in the hooking portion (7213), thereby preventing the fastening between the movable portion (7250) and the snap portion (7230) from being released along the longitudinal central axis (AX1) of the first movable body (7251) and the second movable body (7255).

[0797] In addition, by wrapping and fastening the first fixing portion (7253) and the second fixing portion (7257) to the extended portion (7213a) provided in the hook portion (7213) that is formed protrudingly on the snap body (7231), the fastening projections (7252a, 7256a) that are formed protrudingly on the first fixing portion (7252) and the second fixing portion (7256), respectively, can be prevented from coming off from the fastening holes (7231h) formed at both ends of the snap body (7231).

[0798] The method for installing the bearing device (7200) according to the present invention as described above will be described.

[0799] Figure 45 is a flowchart sequentially illustrating a method of installing a bearing device according to embodiments of the present invention.

[0800] Referring to FIG. 45, the method for installing a bearing device according to the present invention may include a step (S7100) of expanding an inner area of ​​a snap portion (7230), a step (S7200) of arranging a bearing body (7210) and a snap portion (7230) on a shaft, and a step (S7300) of reducing an inner area of ​​the snap portion (7230).

[0801] Referring to FIGS. 39, 41, 43, and 44, the step (S7100) of expanding the inner area of ​​the snap portion (7230) is a step of applying an external force to the snap portion (7230) connected to the bearing body (7210) in which a shaft hole portion (7211) through which a shaft connected to a propeller for a ship (71), specifically a second shaft (7131), can pass, is formed, thereby expanding the inner area of ​​the snap portion (7230) that can overlap with the shaft hole portion (7211).

[0802] Referring to FIG. 39 and FIG. 40, the snap part (7230) is connected to the bearing body (7210), and the movable part (7250) can be fastened to the snap part (7230).

[0803] Specifically, a fastening projection (7252a) provided on a first fastening portion (7252) protruding from a first movable body (7251) is inserted and fastened into a fastening hole (7231h) formed on one of the two ends of the snap body (7231) (the left end as shown in FIG. 43), and a fastening projection (7256a) provided on a second fastening portion (7256) protruding from a second movable body (7255) that can rotate relative to the first movable body (7251) is inserted and fastened into a fastening hole (7231h) formed on the other of the two ends of the snap body (7231) (the right end as shown in FIG. 43).

[0804] Referring to FIG. 44, when the movable part (7250) applies an external force to the snap part (7230), the first movable body (7251) can be rotated in a first direction (counterclockwise as of FIG. 44) with respect to the longitudinal central axis (AX1), and the second movable body (7255) can be rotated in a second direction (clockwise as of FIG. 44) which is the opposite direction to the first direction with respect to the longitudinal central axis (AX1).

[0805] As a result, the snap portion (7230) into which the fastening projections (7252a, 7256a) protruding from the first fastening portion (7252) and the second fastening portion (7256) are inserted and fastened, specifically, the two ends of the snap body (7231) are spread apart, and the inner area of ​​the snap portion (7230) that can overlap with the shaft hole portion (7211) formed in the bearing body (7210) can be expanded.

[0806] Referring to FIGS. 42, 44, and 45, the step (S7200) of placing the bearing body (7210) and the snap part (7230) on a shaft, specifically, a second shaft (7131), is a step of placing the bearing body (7210) and the snap part (7230) on the shaft by passing the second shaft (7131) through a shaft hole (7211) formed in the bearing body (7210), and is a step of placing the bearing body (7210) and the snap part (7230) on the second shaft (7131) located inside the first shaft (7111) connected to the front propeller (7115) and connected to the rear propeller (7135).

[0807] As the inner area of ​​the snap portion (7230) expands, the snap body (7231) can maintain a state in which the second shaft (7131) is not pressed, and the snap portion (7230) and the bearing body (7210) connected to the snap portion (7230) can move along the longitudinal direction (left-right direction based on FIG. 38) of the second shaft (7131).

[0808] As a result, the bearing body (7210) and the snap part (7230) move on the second shaft (7131) and have the effect of being stably positioned at preset positions on the first shaft (7111) and the second shaft (7131).

[0809] In the step (S7200) of placing the bearing body (7210) and the snap part (7230) on the second shaft (7131), the movable part (7250) is maintained in a state of being fastened to the snap part (7230), so that the movable part (7250) fastened to the snap part (7230), specifically the first movable body (7251) and the second movable body (7255), can also be inserted and moved into the inner space of the first shaft (7111), specifically the space between the first shaft (7111) and the second shaft (7131).

[0810] Referring to FIG. 44, when external force is transmitted from the first movable body (7251) and the second movable body (7255), the two ends of the snap body (7231) move in a direction of separation, and as the inner area of ​​the snap body (7231) expands, the connecting portions (7235) connected to both sides of the snap body (7231) can also move in a direction of separation from each other based on the center of the snap body (7231).

[0811] As the first movable body (7251) and the second movable body (7255) rotate relative to each other with respect to the longitudinal central axis (AX1), the first mounting portion (7253) formed on the first movable body (7251) and the second mounting portion (7257) formed on the second movable body (7255) can approach the engaging portion (7213) protrudingly formed on the bearing body (7210), specifically, the extended portion (7213a) formed at one end.

[0812] As a result, the expansion portion (7213a) provided in the catch portion (7213) is hung over the first mounting portion (7253) and the second mounting portion (7257), and the first movable body (7251), the second movable body (7255) and the bearing body (7210) can be maintained in a stably connected state.

[0813] In addition, since the bearing body (7210), the first movable body (7251), and the second movable body (7255) are fastened, there is an effect of preventing the movable body (7250) from being separated from the bearing body (7210) and the fastening state from being released in the process of moving the bearing body (7210) and the snap part (7230) on the second shaft (7131).

[0814] Referring to FIG. 43 and FIG. 45, the step (S7300) of reducing the inner area of ​​the snap portion (7230) is a step of reducing the inner area of ​​the snap portion (7230) by removing the external force applied to the snap portion (7230). In order to space the distance between the two ends of the snap body (7231), the external force applied to the snap body (7231) is removed from the first movable body (7251) and the second movable body (7255), and the first movable body (7251) and the second movable body (7255) can be separated from the snap body (7231).

[0815] Specifically, as the first fastening part (7252) provided on the first movable body (7251) and the second fastening part (7256) provided on the second movable body (7255) rotate relative to each other in a direction approaching each other, the two ends of the snap body (7231) made of an elastically deformable material into which the fastening projection (7252a) protrudingly formed on the first fastening part (7252) and the fastening projection (7256a) protrudingly formed on the second fastening part (7256) are inserted move in a direction approaching each other.

[0816] That is, the two ends can be returned to the original position where they are placed close to each other by the elastic restoring force of the snap body (7231).

[0817] Referring to FIG. 43, as the first movable body (7251) and the second movable body (7255) rotate relative to each other, the first fixing portion (7253) and the second fixing portion (7257) provided on the first movable body (7251) and the second movable body (7255) can move in a direction away from each other so that the engaging portion (7213), specifically the expansion portion (7213a) protruding from the bearing body (7210) is fixed.

[0818] As a result, the fastening between the bearing body (7210) and the movable part (7250), specifically the first movable body (7251) and the second movable body (7255), is released, and the snap part (7230) and the movable part (7250) can be separated. That is, when the bearing body (7210) and the snap part (7230) are installed on the second shaft (7131), the movable part (7250) can be detached from the snap part (7230).

[0819] As the inner area of ​​the snap portion (7230), specifically the snap body (7231), is reduced, the area of ​​the overlapping area with the shaft hole portion (7211) formed in the bearing body (7210) is reduced, and the second shaft (7131) can be pressed in the direction in which the inner area of ​​the snap body (7231) is reduced by the elastic restoring force of the snap body (7231).

[0820] As the snap body (7231) presses the second shaft (7131), the bearing body (7210) and the snap part (7230) can be positioned at a preset position on the second shaft (7131) and can prevent movement in the axial direction of the second shaft (7131).

[0821] In addition, since the bearing body (7210) and the snap part (7230) are placed between the second shaft (7131) and the first shaft (7111), there is an effect of stably supporting the axial load and rotation of the first shaft (7111) and the second shaft (7131).

[0822]

[0823] Hereinafter, the configuration and effect of a bearing device according to a modified example of the seventh embodiment of the present invention will be described.

[0824] Fig. 46 is a drawing showing a state in which a bearing body and a snap part and a movable part are separated according to a modified example of the present invention. Fig. 47 is a drawing partially enlarged of an area in which a snap part and a movable part are combined according to a modified example of the present invention. Fig. 48 is a plan view showing a bearing body and a snap part adjusted on the bearing body according to a modified example of the present invention. Figs. 49 and 50 are drawings showing a state in which an external force is transmitted by a movable part according to a modified example of the present invention and a snap part is adjusted on the bearing body.

[0825] Referring to FIGS. 46 to 50, a bearing device according to a modified example of the present invention may include a bearing body (7210`), a snap part (7230`), and a movable part (7250`).

[0826] Referring to FIGS. 46 to 50, the bearing body (7210`) is formed with a shaft hole (7211`) through which a second shaft connected to a ship propeller, specifically a rear propeller, can pass, and can support rotation of the second shaft.

[0827] The bearing body (7210`) may be a ball bearing. However, it is not limited thereto, and various modifications such as journal bearings and roller bearings are possible within the technical concept that the second shaft can pass through and can support the axial loads of the first shaft and the second shaft.

[0828] The outer surface of the bearing body (7210`) can be in contact with the inner surface of the first shaft connected to the rear propeller, and the inner surface of the bearing body (7210`) can be in contact with the outer surface of the second shaft connected to the front propeller.

[0829] Referring to FIG. 46, the bearing body (7210`) can be connected to the snap part (7230`), and can move on the second shaft by receiving an external force from the movable part (7250`) while the bearing body (7210`) and the snap part (7230`) are connected.

[0830] That is, the second shaft can pass through the shaft hole portion (7211`) formed in the bearing body (7210`), and the bearing body (7210`) and the snap portion (7230`) can move on the second shaft.

[0831] The shaft hole portion (7211`) formed in the bearing body (7210`) can overlap with the snap portion (7230`) in a predetermined area. The area of ​​the overlapping area between the shaft hole portion (7211`) and the snap portion (7230`) can be adjusted by an external force transmitted to the snap portion (7230`) from the movable portion (7250`), and as the overlapping area increases, the snap portion (7230`) can pressurize the shaft and fix its position.

[0832] Referring to FIGS. 46 and 47, a hooking portion (7213`) may be formed to protrude outwardly, specifically toward the snap portion (7230`), on one surface of the bearing body (7210`) facing the snap portion (7230`). The hooking portion (7213`) may be formed to hang over a movable portion (7250`) to be described later, specifically, a first fixing portion (7253`) and a second fixing portion (7257`) formed on a first movable body (7251`) and a second movable body (7255`), respectively.

[0833] The catch (7213`) may be formed in a cylindrical shape. However, it is not limited thereto, and various modifications such as a square pillar are possible within the technical concept of preventing separation between the first anchoring portion (7253`) and the second anchoring portion (7257`) and the snap portion (7230`) and the movable portion (7250`).

[0834] A plurality of catches (7213`) may be provided. The plurality of catches (7213`) may be spaced apart from each other and facing each other based on the center of the shaft hole (7211`). A plurality of connecting parts (7235`) may also be provided to correspond to the plurality of catches (7213`).

[0835] The catch (7213`) is formed to extend in the longitudinal direction and may have an expansion portion (7213`a) whose diameter is expanded in the radial direction in a section preset along the longitudinal central axis. The area of ​​the cross-sectional area based on the longitudinal central axis of the catch (7213`) may be formed to be relatively larger in the expansion portion (7213`a) than in the area excluding the expansion portion (7213`a).

[0836] As a result, the extension part (7213`a) is formed on the first movable body (7251`) and the second movable body (7255`), respectively, and can be placed over the first mounting part (7253`) and the second mounting part (7257`) having steps, thereby preventing the movable part (7250`) from being separated from the bearing body (7210`).

[0837] Referring to FIGS. 46 to 48, a connecting projection (7215`) may be formed protrudingly on one surface of the bearing body (7210`) facing the snap portion (7230`). The connecting projection (7215`) may be formed protrudingly on one surface of the bearing body (7210`) on which the engaging portion (7213`) is formed protrudingly.

[0838] A snap portion (7230`), specifically a snap body (7231`), can be rotatably connected to a connecting projection (7215`). Specifically, a through hole portion (7231`a) is formed through the snap body (7231`), and the connecting projection (7215`) passes through the through hole portion (7231`a) so that the snap body (7231`) can be rotatably connected to the bearing body (7210`).

[0839] A plurality of connecting protrusions (7215`) may be provided to correspond to a plurality of snap bodies (7231`), and may be inserted into each of the through-holes (7231`a) formed through each of the plurality of snap bodies (7231`).

[0840] A plurality of connecting projections (7215`) can be arranged facing each other with respect to the center of the bearing body (7210`).

[0841] The outer end of the connecting protrusion (7215`) may have an expanded cross-sectional area. The cross-sectional area of ​​the outer end of the connecting protrusion (7215`) may be formed to be relatively larger than the cross-sectional area of ​​the through hole (7231`a) formed to penetrate the snap body (7231`).

[0842]

[0843] This can prevent the snap body (7231`) from being separated from the connecting projection (7215`) that is formed protruding from the bearing body (7210`).

[0844] Referring to FIGS. 46 to 48, the snap portion (7230`) is connected to the bearing body (7210`) and can overlap with the shaft hole portion (7211`). The snap portion (7230`) may include a snap body (7231`) and a connecting portion (7235`).

[0845] The snap portion (7230`) receives an external force and adjusts the area of ​​overlap with the shaft hole portion (7211`) and can pressurize the second shaft. Specifically, the shaft is pressed in a direction in which the area of ​​overlap with the shaft hole portion (7211`) increases, and can be fixed at a preset position on the second shaft.

[0846]

[0847] Since the snap part (7230`) is connected to the bearing body (7210`), the snap part (7230`) and the bearing body (7210`) are not respectively placed on the second shaft, but rather move on the second shaft in a connected state and can be placed at a preset position.

[0848] That is, in order to limit the movement of the bearing body (7210`) along the longitudinal direction of the second shaft (left-right direction based on FIG. 38), rather than first installing the bearing body (7210`) and then separately installing the snap part (7230`), the bearing body (7210`) and the snap part (7230`) can be moved and positionally fixed together on the second shaft, thereby improving the convenience of installation of the bearing device.

[0849] Referring to FIGS. 46 to 50, the snap body (7231`) can be formed to extend and have a radius of curvature preset to surround a portion of the outer surface of the second shaft passing through the shaft hole (7211`).

[0850] The snap body (7231`) has one side rotatably connected to a connecting projection (7215`) provided on the bearing body (7210`), and the other side opposite to the one side can be connected to a connecting portion (7235`).

[0851] The snap body (7231`) can rotate clockwise or counterclockwise on the bearing body (7210`) with the longitudinal center axis of the connecting projection (7215`) as the rotation center axis.

[0852] A plurality of snap bodies (7231`) are provided, and the plurality of snap bodies (7231`) can be arranged facing each other based on the center of the shaft hole portion (7211`) formed in the bearing body (7210`).

[0853] Referring to FIGS. 46 to 48, a connecting portion (7235`) is coupled to a snap body (7231`) and can connect the snap body (7231`) and the bearing body (7210`). One side of the connecting portion (7235`) can be connected to the snap body (7231`), and the opposite side thereof can be connected to the bearing body (7210`).

[0854] The connecting portion (7235`) can be connected to at least one of the bearing body (7210`) and the snap body (7231`) and fixed in position. The connecting portion (7235`) can be formed of a material capable of elastic deformation.

[0855] In the present invention, the connecting portion (7235`) is formed in a spring shape, but is not limited thereto. The length can be adjusted, and various modifications such as a torsion spring can be implemented within the technical concept of being able to elastically support the snap body (7231`).

[0856] A plurality of connecting parts (7235`) may be provided so as to be connected to each of a plurality of snap bodies (7231`).

[0857] The connecting portion (7235`) may have elastic restoring force in the direction in which the snap body (7231`) faces the shaft hole portion (7211`). From another perspective, the connecting portion (7235`) may have elastic restoring force in the direction from the bearing body (7210`) toward the snap body (7231`).

[0858] As a result, the snap body (7231`) that receives external force from the movable part (7250`) rotates relative to the bearing body (7210`), and then when the external force is removed, the snap body (7231`) can be returned to its original position.

[0859] Referring to FIGS. 46 to 50, a movable part (7250`) according to a modified example of the present invention is capable of contacting a snap part (7230`), specifically a snap body (7231`), and can change (or adjust) the area of ​​the overlapping area between the snap part (7230`) and the shaft hole part (7211`) by transmitting power (or external force) to the snap part (7230`).

[0860] Referring to FIGS. 46 and 47, the movable part (7250`) may include a first movable body (7251`) and a second movable body (7255`). The first movable body (7251`) extends in the longitudinal direction and is hollow inside. The second movable body (7255`) shares a longitudinal central axis with the first movable body (7251`) and is insertable into the interior of the first movable body (7251`).

[0861] That is, the first movable body (7251`) and the second movable body (7255`) can be arranged to overlap each other along the longitudinal central axis. The first movable body (7251`) and the second movable body (7255`) can rotate relative to each other based on the longitudinal central axis.

[0862] In the present invention, the first movable body (7251`) and the second movable body (7255`) are rotated in opposite directions, but this is not limited to the technical concept of the first movable body (7251`) and the second movable body (7255`) being rotated relative to each other. Various modifications are possible, such as fixing the position of one of the first movable body (7251`) and the second movable body (7255`) and rotating the other.

[0863] Although not shown in the drawing, the movable part (7250`) is connected to the first movable body (7251`) and the second movable body (7255`) and may include a driving unit that transmits power. The driving unit receives power from an external source and transmits power to the first movable body (7251`) and the second movable body (7255`) to relatively rotate the first movable body (7251`) and the second movable body (7255`).

[0864] As an optional embodiment, even without a driving source such as a driving unit, the user can directly rotate the first movable body (7251`) and the second movable body (7255`) relative to each other.

[0865] Referring to FIGS. 46 and 47, on one side of the first movable body (7251`) facing the snap part (7230`), specifically the snap body (7231`), a contact part (7252`) that can be in surface contact with one side of the snap body (7231`) that is rotatably connected to the bearing body (7210`) can be protrudedly formed.

[0866] The inner surface of the contact portion (7252`) and the outer surface of the snap body (7231`) can rotate together by frictional force as the first movable body (7251`) rotates while in contact. That is, the inner surface of the contact portion (7252`) and the outer surface of the snap body (7231`) have a preset friction coefficient and can rotate together by frictional force when in contact.

[0867] As an optional embodiment, the inner surface of the contact portion (7252`) and the outer surface of the snap body (7231`) may be connected in a gear-engaged manner. Specifically, a screw groove may be formed on the inner surface of the contact portion (7252`), and a screw thread may be formed on the outer surface of the facing snap body (7231`) to correspond to the shape of the screw groove formed on the contact portion (7252`).

[0868] As the contact portion (7252`) and the snap body (7231`) are engaged, the snap body (7231`) can also rotate when the first movable body (7251`) rotates.

[0869] Referring to FIGS. 49 and 50, as the first movable body (7251`) rotates in the first direction (counterclockwise based on FIG. 50), a plurality of snap bodies (7231`) arranged facing each other rotate together, and one end of the plurality of snap bodies (7231`) connected to the plurality of connecting portions (7235`) can move in a direction away from the center of the shaft hole portion (7211`).

[0870] As a result, the area of ​​the overlapping area between the snap portion (7230`) and the shaft hole portion (7211`) formed in the bearing body (7210`) increases, and there is an effect that the bearing body (7210`) and the snap portion (7230`) can move on the second shaft.

[0871] Referring to FIGS. 46 to 50, a first fixing portion (7253`) on which a catch portion (7213`) can be fixed is formed protrudingly in the first movable body (7251`), and a second fixing portion (7257`) on which a catch portion (7213`) can be fixed can be formed protrudingly in the second movable body (7255`) and which is positioned facing the first fixing portion (7253`).

[0872] The first anchoring portion (7253`) and the second anchoring portion (7257`) can be arranged facing each other with the catch portion (7213`) between them.

[0873] The first mounting portion (7253`) and the second mounting portion (7257`) may have steps and may each be formed with a hooking groove (drawing symbol not specified). An extension portion (7213`a) provided on a hooking portion (7213`) protruding from the snap body (7231`) may be hooked onto the hooking grooves formed on the first mounting portion (7253`) and the second mounting portion (7257`).

[0874] From another perspective, the gap groove portion may be formed in a step shape, with the distance from the longitudinal center axis changing along the longitudinal direction in the first anchor portion (7253`) and the second anchor portion (7257`).

[0875] The first anchoring portion (7253`) and the second anchoring portion (7257`) may be provided in multiple numbers to correspond to multiple catch portions (7213`).

[0876] A plurality of first fixing portions (7253`) can be arranged symmetrically with respect to the longitudinal central axis (AX1) of the first movable body (7251`), and a plurality of second fixing portions (7257`) can be arranged symmetrically with respect to the longitudinal central axis (AX1) of the second movable body (7255`).

[0877] Referring to FIG. 47, FIG. 49, and FIG. 50, the first fixing portion (7253`) and the second fixing portion (7257`) can be arranged facing each other with one of the plurality of catch portions (7213`) interposed therebetween.

[0878] A first fixing portion (7253`) protrudingly formed on a first movable body (7251`) and a second fixing portion (7257`) protrudingly formed on a second movable body (7255`) can be arranged to face each other with a catch portion (7213`) therebetween. The distance between the first fixing portion (7253`) and the second fixing portion (7257`) from the center of the catch portion (7213`) can be adjusted as the first movable body (7251`) and the second movable body (7255`) rotate relative to each other.

[0879] Referring to FIG. 47, FIG. 49, and FIG. 50, when a plurality of contact portions (7252`) protrudingly formed on the first movable body (7251`) are in contact with a plurality of snap bodies (7231`), and the first movable body (7251`) is rotated relative to the second movable body (7255`), the distance between the first fixing portion (7253`) and the second fixing portion (7257`) becomes close.

[0880] As the first anchoring portion (7253`) and the second anchoring portion (7257`) come close to each other, one side of the expansion portion (7213`a) provided in the catch portion (7213`) can be hung on the first anchoring portion (7253`), and the other side opposite thereto can be hung on the second anchoring portion (7257`).

[0881] Accordingly, the width of the inner region of the snap body (7231`) is increased, and the first fixing portion (7253`) and the second fixing portion (7257`) are fastened by wrapping around the expansion portion (7213`a) provided in the hooking portion (7213`), thereby preventing the fastening between the movable portion (7250`) and the snap portion (7230`) along the longitudinal central axis of the first movable body (7251`) and the second movable body (7255`) from being released.

[0882] The bearing device according to the present invention has the effect of being able to stably place the bearing device at a preset position on a shaft connected to a ship propeller by applying an external force to a snap portion connected to the bearing body.

[0883] In addition, the bearing body and the snap part are connected and moved and installed together on the shaft, thereby minimizing the installation process and enabling the bearing device to be installed simply.

[0884] A method for installing a bearing device according to a modified example of the present invention as described above is described.

[0885] Referring to FIG. 45, the method for installing a bearing device may include a step (S7100) of expanding an inner area of ​​a snap portion (7230`), a step (S7200) of placing a bearing body (7210`) and a snap portion (7230`) on a shaft, and a step (S7300) of reducing an inner area of ​​the snap portion (7230`).

[0886] Referring to FIG. 45, FIG. 48, and FIG. 50, the step (S7100) of expanding the inner area of ​​the snap portion (7230`) is a step of applying an external force to the snap portion (7230`) connected to the bearing body (7210`) in which the shaft hole portion (7211`) through which the shaft connected to the ship propeller, specifically the second shaft, is formed, to expand the inner area of ​​the snap portion (7230`) that can be overlapped with the shaft hole portion (7211`).

[0887] Referring to FIG. 46 and FIG. 47, the snap part (7230`) is connected to the bearing body (7210`), and the movable part (7250`) can be fastened to the snap part (7230`).

[0888] Specifically, the first mounting portion (7253`) formed on the first movable body (7251`) and the second mounting portion (7257`) formed on the second movable body (7255`) can be arranged to face each other with a catch portion (7213`) formed protruding from the bearing body (7210`) interposed therebetween.

[0889] At this time, when the first movable body (7251`) and the second movable body (7255`) are rotated relative to each other based on the longitudinal central axis, the contact portion (7252`) protrudingly formed on the first movable body (7251`) can rotate the snap body (7231`) by frictional force while in contact with the snap body (7231`).

[0890] Referring to Fig. 50, a plurality of snap bodies (7231`) arranged facing each other with respect to the center of the shaft hole portion (7211`) can be separated from the second shaft by rotating by receiving an external force from a contact portion (7252`) provided on each of a plurality of first movable bodies (7251`).

[0891] From another perspective, as one end of a plurality of facing snap bodies (7231`) moves away from each other, the inner area of ​​the snap body (7230`) that can overlap with the shaft hole portion (7211`) formed in the bearing body (7210`) can be expanded.

[0892] Referring to FIG. 45, FIG. 47, and FIG. 49, the step (S7200) of placing the bearing body (7210`) and the snap part (7230`) on a shaft, specifically, a second shaft, is a step of placing the bearing body (7210`) and the snap part (7230`) on the shaft by passing the second shaft through a shaft hole part (7211`) formed in the bearing body (7210`), and is a step of placing the bearing body (7210`) and the snap part (7230`) on the second shaft, which is located inside a first shaft connected to a front propeller and connected to a rear propeller.

[0893] As the inner area of ​​the snap part (7230`) expands, the snap body (7231`) can maintain a state in which the second shaft is not pressed, and the snap part (7230`) and the bearing body (7210`) connected to the snap part (7230`) can move along the longitudinal direction of the second shaft (left-right direction based on FIG. 38).

[0894] As a result, the bearing body (7210`) and the snap part (7230`) move on the second shaft and have the effect of being stably positioned at preset positions on the first shaft and the second shaft.

[0895] In the step (S7200) of placing the bearing body (7210`) and the snap part (7230`) on the second shaft, the first mounting part (7253`) and the second mounting part (7257`) formed on the first movable body (7251`) and the second movable body (7255`) respectively are fastened by surrounding the engaging part (7213`) protruding from the bearing body (7210`), thereby maintaining the state in which the movable part (7250`) is fastened to the snap part (7230`).

[0896] Accordingly, the movable part (7250`) fastened to the snap part (7230`), specifically the first movable body (7251`) and the second movable body (7255`), can also be inserted and moved into the inner space of the first shaft, specifically the space between the first shaft and the second shaft.

[0897] Referring to FIG. 50, an external force is transmitted from a plurality of first movable bodies (7251`) so that one end of a plurality of snap bodies (7231`) moves away from each other, and as the inner area of ​​the snap portion (7230`) expands, the connecting portion (7235`) connected to the one end is compressed to generate an elastic restoring force.

[0898] As the first movable body (7251`) and the second movable body (7255`) rotate relative to each other with respect to the longitudinal central axis (AX1), the first fixing portion (7253`) formed on the first movable body (7251`) and the second fixing portion (7257`) formed on the second movable body (7255`) can approach the engaging portion (7213`) protrudingly formed on the bearing body (7210`), specifically, the extended portion (7213`a) formed at one end.

[0899] As a result, the expansion portion (7213`a) provided in the catch portion (7213`) is hung over the first fixing portion (7253`) and the second fixing portion (7257`), and the first movable body (7251`), the second movable body (7255`) and the bearing body (7210`) can be maintained in a stably connected state.

[0900] In addition, since the bearing body (7210`) and the first movable body (7251`) and the second movable body (7255`) are fastened, there is an effect of preventing the movable body (7250`) from being separated from the bearing body (7210`) and the fastening state from being released in the process of moving the bearing body (7210`) and the snap part (7230`) on the second shaft.

[0901] Referring to FIG. 45 and FIG. 49, the step (S7300) of reducing the inner area of ​​the snap portion (7230`) is a step of reducing the inner area of ​​the snap portion (7230`) by removing the external force applied to the snap portion (7230`). By removing the external force applied to the snap portion (7231`) from the movable portion (7250`), specifically the first movable portion (7251`), so that each end of the plurality of snap bodies (7231`) is separated, the first movable body (7251`) and the second movable body (7255`) can be separated from the snap body (7231`).

[0902] Specifically, when the contact portion (7252`) formed on the first movable body (7251`) and the snap body (7231`) are in contact, the first movable body (7251`) is rotated in the direction opposite to the direction for increasing the inner area of ​​the snap portion (7230`) (counterclockwise as shown in FIG. 49) so that the snap body (7231`) can rotate in the direction for pressing the second shaft.

[0903] In addition, the connecting portion (7235`) connected to the opposite end of the snap body (7231`) that is rotatably connected to the connecting projection (7215`) has elastic restoring force in the direction in which the other end of the snap body (7231`) is directed toward the center of the shaft hole portion (7211`), thereby enabling the snap body (7231`) to pressurize the second shaft.

[0904] Referring to FIG. 49, as the first movable body (7251`) and the second movable body (7255`) rotate relative to each other, the first fixing portion (7253`) and the second fixing portion (7257`) provided on the first movable body (7251`) and the second movable body (7255`) can move in a direction away from each other so that the engaging portion (7213`), specifically the expansion portion (7213`a) protrudingly formed on the bearing body (7210`) is fixed.

[0905] As a result, the fastening between the bearing body (7210`) and the movable part (7250`), specifically the first movable body (7251`) and the second movable body (7255`), is released, and the snap part (7230`) and the movable part (7250`) can be separated. That is, the movable part (7250`) can be detached from the snap part (7230`) while the bearing body (7210`) and the snap part (7230`) are installed on the second shaft.

[0906] As the inner area of ​​the snap portion (7230`), specifically the snap body (7231`), is reduced, the area of ​​the overlapping area with the shaft hole portion (7211`) formed in the bearing body (7210`) is reduced, and the second shaft can be pressed in the direction in which the inner area of ​​the snap body (7231`) is reduced by the elastic restoring force of the snap body (7231`).

[0907] As the snap body (7231`) presses the second shaft, the bearing body (7210`) and the snap part (7230`) can be positioned at a preset position on the second shaft and can prevent movement in the axial direction of the second shaft.

[0908] In addition, since the bearing body (7210`) and the snap part (7230`) are arranged between the second shaft and the first shaft, there is an effect of stably supporting the axial load and rotation of the first shaft and the second shaft.

[0909] A bearing device according to a modified example of the present invention has a connecting protrusion (7215`) protrudingly formed on a bearing body (7210`), one side of a snap body (7231`) is rotatably connected to the bearing body (7210`), specifically the connecting protrusion (7215`), and the other side is elastically supported by a connecting portion (7235`), and a contact portion (7252`) provided on a first movable body (7251`) and the snap body (7231`) are in surface contact with each other and are rotatable by frictional force, and therefore the remaining configuration and installation method of the bearing device (7200) according to the present invention are the same, and therefore, a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0910]

[0911] Hereinafter, the configuration and effect of a bearing device according to another modified example of the seventh embodiment of the present invention will be described.

[0912] Figure 51 is a plan view showing a bearing body and a snap part adjusted on the bearing body according to another modified example of the present invention.

[0913] Since the bearing device according to another modified example of the present invention has a difference in the snap portion (7230``) compared to the bearing device according to the modified example of the present invention, the following description will focus on this.

[0914] Referring to Fig. 51, the snap portion (7230``) is connected to the bearing body (7210``) and can overlap with the shaft hole portion (7211``). The snap portion (7230``) may include a snap body (7231``) and a connecting portion (7235``).

[0915] The snap portion (7230``) receives an external force and adjusts the area of ​​the overlapping area with the shaft hole portion (7211``) and can pressurize the second shaft. Specifically, the snap portion presses the second shaft in a direction in which the area of ​​the overlapping area with the shaft hole portion (7211``) increases, and can be fixed at a preset position on the second shaft.

[0916] Since the snap part (7230``) is connected to the bearing body (7210``), the snap part (7230``) and the bearing body (7210``) are not respectively placed on the second shaft, but can move on the second shaft in a connected state and be placed at a preset position.

[0917] That is, in order to limit the movement of the bearing body (7210``) along the longitudinal direction of the second shaft (left-right direction based on FIG. 38), rather than first installing the bearing body (7210``) and then separately installing the snap part (7230``), the bearing body (7210``) and the snap part (7230``) can be moved and positionally fixed together on the second shaft, thereby improving the convenience of installation of the bearing device.

[0918] Referring to FIG. 51, the snap body (7231``) can be formed to extend and have a radius of curvature preset to surround a portion of the outer surface of the second shaft passing through the shaft hole (7211``).

[0919] The snap body (7231``) has one side rotatably connected to a connecting projection (7215``) provided on the bearing body (7210``), and the other side opposite to the one side can be connected to a connecting portion (7235``).

[0920] The snap body (7231``) can rotate clockwise or counterclockwise on the bearing body (7210``) with the longitudinal center axis of the connecting projection (7215``) as the rotation center axis.

[0921] A plurality of snap bodies (7231``) are provided, and the plurality of snap bodies (7231``) can be arranged facing each other based on the center of the shaft hole portion (7211``) formed in the bearing body (7210``).

[0922] Referring to Fig. 51, the connecting portion (7235``) is connected to the snap body (7231``), and can connect the snap body (7231``) and the bearing body (7210``). One side of the connecting portion (7235``) is fixed to the bearing body (7210``), and the other side opposite thereto can be connected to the snap body (7231``).

[0923] The snap body (7231``) can be placed on the bearing body (7210``) while wrapping around the connecting portion (7235``). Specifically, the connecting portion (7235``) and the snap body (7231``) are formed integrally, and can be placed on the bearing body (7210``) while wrapping around the connecting protrusion (7215``) that is formed protruding from the bearing body (7210``).

[0924] The snap body (7231``) and the connecting portion (7235``) can wrap around the connecting projection (7215``) and have elastic restoring force in a preset direction (counterclockwise or clockwise).

[0925] When the snap part (7230``) is wound in a counterclockwise direction (based on Fig. 51), it can have elastic restoring force in the opposite direction, that is, clockwise direction (based on Fig. 51).

[0926] Referring to Fig. 51, the movable part, specifically the contact part (7252``) provided on the first movable body, and the snap body (7231``) are in surface contact and rotate by frictional force, and since one side of the connecting part (7235``) is fixed in position to the bearing body (7210``), the snap body (7231``) and the connecting part (7235``) are wound around the connecting projection (7215``).

[0927] As a result, one end of the snap body (7231``) that is spaced apart from the connecting projection (7215``) is spaced apart from the center of the shaft hole portion (7211``) formed in the bearing body (7210``), and the area of ​​the overlapping area between the snap body (7230``) and the shaft hole portion (7211``) may be reduced.

[0928] In addition, since the snap portion (7230``) does not pressurize the second shaft and is separated, the bearing body (7210``) and the snap portion (7230``) can move on the second shaft.

[0929] In a bearing device according to another modified example of the present invention, one end of a connecting portion (7235``) is fixed to a bearing body (7210``) and the opposite end thereof is connected to a snap body (7231``), and the snap body (7231``) and the connecting portion (7235``) surround a connecting projection (7215``) protruding from the bearing body (7210``), and receive an external force from the movable portion and are wrapped around the connecting projection (7215``) to generate an elastic restoring force. In this regard, the bearing body (7210``) and the movable portion have the same configuration and installation method as the bearing body (7210``) and the movable portion (7250`) according to the modified example of the present invention, and therefore, a detailed description thereof will be omitted to the extent that it overlaps therewith.

[0930] Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0931] According to the present invention, a propulsion device for a ship is provided. Furthermore, embodiments of the present invention can be applied to ships equipped with counter-rotating propellers for industrial use.

Claims

1. A shaft section including a first shaft having a hollow portion and a second shaft disposed in the hollow portion, on which a counter-rotating propeller is arranged; a driving unit that rotates the shaft unit; and A ship propulsion device, comprising a buffer unit provided in the shaft unit to buffer axial vibration of the shaft unit.

2. In paragraph 1, The above buffer part, A second shaft protrusion provided on the second shaft; A first shaft protrusion provided on the first shaft and arranged to surround the second shaft protrusion; and A propulsion device for a ship, comprising: a housing arranged to surround the first shaft protrusion; 3. In paragraph 2, The above buffer part, Further comprising oil flowing by axial movement of the shaft portion, A ship propulsion device, wherein the oil flows in the opposite direction to the axial movement direction of the shaft portion.

4. In paragraph 2, The above buffer part, A first spacer arranged along the outer circumference of the second shaft protrusion; and a second spacer disposed along the outer surface of the first shaft protrusion; The inner surfaces of the first spacer and the first shaft protrusion are spaced apart from each other, A ship propulsion device, wherein the inner surface of the second spacer and the housing are spaced apart from each other.

5. In paragraph 2, A first friction pad arranged on one side and the other side of the second shaft protrusion; and A propulsion device for a ship, comprising: a second friction pad disposed on one side and the other side of the first shaft protrusion; 6. In paragraph 5, A plurality of grooves through which oil flows are arranged on the surfaces of the first friction pad and the second friction pad, A ship propulsion device, wherein the plurality of grooves are arranged radially along the surface of the first friction pad or the second friction pad.

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