OD box for adjustable propeller shaft

Abstract

The OD box comprises a feedback rod, a rotor, an oil distribution shaft and a stator, the feedback rod penetrates through the inner side of the rotor and is in sliding fit with the rotor, the rotor is installed in a middle hole of the oil distribution shaft, the rotor and the oil distribution shaft are axially fixed, the stator is sleeved on the oil distribution shaft in an empty mode, an oil seal is arranged between the stator and the oil distribution shaft, and the oil seal is arranged in the middle hole of the oil distribution shaft. The two oil seals are respectively arranged at two ends of the stator; the stator, the oil distribution shaft and the feedback rod are provided with oil channels for oil distribution, and the oil channels are provided with valves. The oil distribution shaft comprises a linkage section, an oil distribution section and a connection section which are sequentially arranged, the stator is arranged on the oil distribution section in a sleeving manner, the rotor is mounted in the oil distribution section, an annular groove is formed in the outer surface of the oil distribution section, a tungsten carbide coating is arranged in the annular groove, and the stator and the oil seal are arranged on the tungsten carbide coating in a sleeving manner. According to the scheme, the abrasion resistance of the outer circle of the oil distribution shaft is higher, no extra component is added, and the oil distribution shaft is simple, practical and high in reliability.

Description

Technical Field

[0001] The utility model relates to the field of oil distributors, in particular to an OD box for an adjustable propeller shaft. Background Art

[0002] With the continuous development of ship propulsion technology, adjustable propellers have been widely used in various ships due to their good maneuverability, lower fuel consumption, and more environmentally friendly. The OD box is the oil distribution device of the adjustable propeller, which is generally installed at the front end of the gearbox; the shaft-mounted OD box is a new structure, which is installed at the rear end of the gearbox, between the gearbox and the adjustable propeller shaft. The feedback rod of the shaft-mounted OD box does not need to pass through the gearbox, which makes maintenance easier and the ship's transmission shaft system more compact.

[0003] The prior art with publication number CN110316346A discloses an on-shaft oil distributor for an adjustable propeller, which mainly includes an oil distribution shaft, a slewing sleeve, a locating pin, a rotating sealing ring, an oil distribution ring, a hydraulically controlled one-way valve, a feedback rod, a feedback ring, an anti-rotation pin, and a support; the slewing sleeve is installed in the inner hole of the oil distribution shaft, and the axial position of the slewing sleeve and the oil distribution shaft is controlled by the locating pin. Two hydraulically controlled one-way valves are arranged at the front end of the slewing sleeve, and the two-way oil circuit is locked to keep the pitch stable; the oil distribution ring is sleeved on the oil distribution shaft, and the oil distribution ring is arranged in a floating manner to prevent the oil distribution ring and the oil distribution shaft from biting each other, and rotating sealing rings are installed at both ends of the oil distribution ring to prevent hydraulic oil leakage.

[0004] When the prior art is actually used, the oil distribution shaft of the OD box on the shaft rotates with the propeller shaft of the adjustable pitch propeller, while the stator is stationary. The outer circle of the oil distribution shaft and the inner hole of the stator are in relative rotation for a long time; over time, the skeleton oil seals at both ends of the stator will scratch grooves on the outer surface of the oil distribution shaft, causing oil leakage in the adjustable pitch propeller. In severe cases, the entire adjustable pitch propeller system will fail, and the oil distribution shaft will need to be replaced; this will not only cause great economic losses to users, but also threaten the safety of the ship. Utility Model Content

[0005] In order to solve the problem in the prior art that the oil seal scratches the oil distribution shaft, resulting in a reduced life of the oil distribution shaft and higher user costs, the utility model aims to provide an OD box for an adjustable propeller shaft.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an OD box for an adjustable propeller shaft, comprising a feedback rod, a rotor, an oil distribution shaft and a stator, the feedback rod passes through the inner side of the rotor and slides with the rotor, the rotor is installed in the middle hole of the oil distribution shaft, the rotor and the oil distribution shaft are axially fixed, the stator is hollowly sleeved on the oil distribution shaft, an oil seal is arranged between the stator and the oil distribution shaft, and two oil seals are arranged at both ends of the stator respectively;

[0007] It also includes a first working oil passage and a second working oil passage, wherein the first working oil passage is arranged on the stator, the oil distribution shaft and the feedback rod, the first opening on the stator is communicated with the inner cavity of the feedback rod through the first working oil passage, and the second working oil passage is arranged on the stator, the oil distribution shaft and the rotor, the second opening on the stator is communicated with the middle hole of the oil distribution shaft through the second working oil passage; valves are respectively installed on the first working oil passage and the second working oil passage;

[0008] The oil distribution shaft comprises a linkage section, an oil distribution section and a connecting section which are arranged in sequence. The stator is sleeved on the oil distribution section, and the rotor is installed in the oil distribution section. An annular groove is arranged on the outer surface of the oil distribution section, and a tungsten carbide coating is arranged in the annular groove. The stator and the oil seal are both sleeved on the tungsten carbide coating.

[0009] Preferably, the outer diameter of the tungsten carbide coating is the same as the outer diameter of the oil distribution section.

[0010] Preferably, the depth of the annular groove is 0.15 mm.

[0011] Preferably, a tungsten carbide coating is sprayed on the inner wall of the stator.

[0012] Preferably, assembly grooves are provided at both ends of the stator, and two oil seals are respectively arranged in the two assembly grooves. Pressure plates are fixed at both ends of the stator, and the stator and the pressure plates clamp and axially fix the oil seals.

[0013] Preferably, the oil seal is a skeleton oil seal.

[0014] Preferably, the first working oil channel includes a first oil hole, a second oil hole and a third oil hole, the first oil hole is arranged on the oil distribution shaft, the first oil hole is connected to the first opening, the second oil hole is arranged on the rotor, and the third oil hole is arranged on the feedback rod; the valve is installed in the second oil hole.

[0015] Preferably, the second working oil passage includes a fourth oil passage and a fifth oil passage, the fourth oil passage is arranged on the oil distribution shaft, the fourth oil hole is connected to the second opening, and the fifth oil passage is arranged on the rotor; the valve is installed in the fifth oil hole.

[0016] Preferably, the valve comprises a hydraulically controlled one-way valve.

[0017] Preferably, the valve is arranged axially.

[0018] The beneficial effects of the technical solution of the utility model are as follows: in the above solution, the outer circle of the oil distribution shaft has stronger wear resistance, and no additional components are added. It is simple, practical and reliable, which can effectively prevent the oil seal from scratching the surface of the oil distribution shaft, reduce the risk of oil leakage caused by wear between the outer circle of the oil distribution shaft and the stator, thereby reducing the occurrence of OD box failure on the adjustable propeller shaft and greatly reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the structural diagram of OD box;

[0020] Figure 2 It is a structural schematic diagram of the oil distribution shaft.

[0021] Figure numerals: 1, oil distribution shaft; 11, linkage section; 12, oil distribution section; 13, connecting section; 14, center hole; 15, ring groove; 2, rotor; 3, tungsten carbide coating; 4, pressure plate; 5, bolt; 6, stator; 7, oil seal; 8, feedback rod; 9, valve; 100, first working oil channel; 200, second working oil channel; 300, first opening; 400, second opening. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0027] like Figure 1 and Figure 2 An OD box for an adjustable propeller shaft is shown, comprising a feedback rod 8, a rotor 2, an oil distribution shaft 1 and a stator 6, wherein the feedback rod 8 passes through the inner side of the rotor 2 and slides with the rotor 2, the rotor 2 is mounted in the middle hole 11 of the oil distribution shaft 1, the rotor 2 and the oil distribution shaft 1 are axially fixed, the stator 6 is hollowly sleeved on the oil distribution shaft 1, an oil seal 7 is arranged between the stator 6 and the oil distribution shaft 1, and two oil seals 7 are arranged at both ends of the stator 6; it also comprises a first working oil passage 100 and a second working oil passage 200, the first working oil passage 100 is arranged on the stator 6, the oil distribution shaft 1 and the feedback rod 8, the first opening 300 on the stator 6 is communicated with the inner cavity of the feedback rod 8 through the first working oil passage 100, the second working oil passage 200 is arranged on the stator 6, the oil distribution shaft 1 and the rotor 2, the second opening 400 on the stator 6 is communicated with the middle hole 11 of the oil distribution shaft 1 through the second working oil passage 200; valves 9 are respectively installed on the first working oil passage 100 and the second working oil passage 200;

[0028] The oil distribution shaft 1 includes a linkage section 11, an oil distribution section 12 and a connecting section 13 which are arranged in sequence. The stator 6 is sleeved on the oil distribution section 12, and the rotor 2 is installed in the oil distribution section 12. An annular groove 15 is provided on the outer surface of the oil distribution section 12, and a tungsten carbide coating 3 is provided in the annular groove 15. The stator 6 and the oil seal 7 are both sleeved on the tungsten carbide coating 3.

[0029] In this way, in the above scheme, by spraying the tungsten carbide coating 3, the surface hardness of the matching section between the oil distribution shaft 1 and the stator 6 reaches HRC65-70, thereby improving the wear resistance of the oil distribution shaft 1. This scheme is simple, practical and reliable, which can effectively prevent the oil seal 7 from scratching the surface of the oil distribution shaft 1, reduce the risk of oil leakage caused by wear between the outer circle of the oil distribution shaft 1 and the stator 6, thereby reducing the occurrence of OD box failure on the adjustable propeller shaft, and greatly reducing the maintenance cost; the mechanism of the above oil distribution shaft 1 does not have any additional components, and does not need to change the structural parameters of other frames.

[0030] In this embodiment, Figure 2As shown, the depth of the annular groove 15 on the oil distribution shaft 1 is 0.15 mm, and tungsten carbide is sprayed in the annular groove 15 using a tool; after the tungsten carbide coating 3 is sprayed, the outer diameter of the tungsten carbide coating 3 is made the same as the outer diameter of the oil distribution section 12 by grinding, and the surface roughness of the tungsten carbide coating 3 reaches 1.6. Further preferably, the inner wall of the stator 6 is sprayed with a tungsten carbide coating 3. In this way, the inner wall of the stator 6 and the outer wall of the oil distribution shaft 1 are sprayed with a tungsten carbide coating 3, thereby increasing the relative hardness of the stator 6 and the oil distribution shaft 1 matching section to avoid wear.

[0031] In this embodiment, assembly grooves are provided at both ends of the stator 6, and two oil seals 7 are respectively provided in the two assembly grooves. Pressure plates 4 are fixed at both ends of the stator 6. The stator 6 and the pressure plate 4 clamp the oil seal 7 and fix it axially. The pressure plate 4 is fixed to the stator by bolts 5. Further preferably, the oil seal 7 is a skeleton oil seal 7.

[0032] In this embodiment, the first working oil passage 100 includes a first oil hole, a second oil hole and a third oil hole, the first oil hole is arranged on the oil distribution shaft 1, the first oil hole is connected to the first opening 300, the second oil hole is arranged on the rotor 2, and the third oil hole is arranged on the feedback rod 8; the second working oil passage 200 includes a fourth oil passage and a fifth oil passage, the fourth oil passage is arranged on the oil distribution shaft 1, the fourth oil hole is connected to the second opening 400, and the fifth oil passage is arranged on the rotor 2; the valve 9 is installed in the fifth oil hole. Further preferably, two valves 9 are respectively installed in the second oil hole and the fifth oil hole on the rotor 2. The two valves 9 are respectively a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve, the first hydraulically controlled one-way valve is arranged in the second oil hole, the second hydraulically controlled one-way valve is arranged in the fifth oil hole, and the two hydraulically controlled one-way valves are both axially arranged.

[0033] When the ship is moving forward, the first hydraulically controlled one-way valve is opened, and the second hydraulically controlled one-way valve is closed. The working oil enters from the first opening 300 of the stator 6, and then passes through the first oil hole of the oil distribution shaft 1, the second oil hole of the rotor 2 and the third oil hole of the feedback rod 8 in sequence, and enters the inner cavity of the feedback rod 8, thereby pushing the blade forward to make the ship move forward.

[0034] When reversing, the second hydraulically controlled one-way valve is opened, the first hydraulically controlled one-way valve is closed, the working oil enters from the second opening 400 of the stator 6, and then passes through the fourth oil hole of the oil distribution shaft 1 and the fifth oil hole of the rotor 2 in sequence, and then passes through the inner cavity of the propeller shaft, thereby pushing the propeller blades in the opposite direction and making the ship reverse.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An OD box for an adjustable propeller shaft, comprising a feedback rod (8), a rotor (2), an oil distribution shaft (1) and a stator (6), wherein the feedback rod (8) passes through the inner side of the rotor (2) and is slidably matched with the rotor (2), the rotor (2) is installed in a center hole (14) of the oil distribution shaft (1), the rotor (2) and the oil distribution shaft (1) are axially fixed, the stator (6) is hollowly sleeved on the oil distribution shaft (1), an oil seal (7) is arranged between the stator (6) and the oil distribution shaft (1), and two oil seals (7) are respectively arranged at two ends of the stator (6); It also comprises a first working oil passage (100) and a second working oil passage (200), wherein the first working oil passage (100) is arranged on the stator (6), the oil distribution shaft (1) and the feedback rod (8), and the first opening (300) on the stator (6) is communicated with the inner cavity of the feedback rod (8) through the first working oil passage (100); the second working oil passage (200) is arranged on the stator (6), the oil distribution shaft (1) and the rotor (2), and the second opening (400) on the stator (6) is communicated with the middle hole (14) of the oil distribution shaft (1) through the second working oil passage (200); valves (9) are respectively installed on the first working oil passage (100) and the second working oil passage (200); Features: The oil distribution shaft (1) comprises a linkage section (11), an oil distribution section (12) and a connecting section (13) which are arranged in sequence. The stator (6) is sleeved on the oil distribution section (12). The rotor (2) is installed in the oil distribution section (12). An annular groove (15) is provided on the outer surface of the oil distribution section (12). A tungsten carbide coating (3) is provided in the annular groove (15). The stator (6) and the oil seal (7) are both sleeved on the tungsten carbide coating (3).

2. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The outer diameter of the tungsten carbide coating (3) is the same as the outer diameter of the oil distribution section (12).

3. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The depth of the annular groove (15) is 0.15 mm.

4. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The inner wall of the stator (6) is sprayed with a tungsten carbide coating.

5. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: Both ends of the stator (6) are provided with assembly grooves, and two oil seals (7) are respectively arranged in the two assembly grooves. Both ends of the stator (6) are fixed with pressure plates (4), and the stator (6) and the pressure plates (4) clamp the oil seals (7) and fix them axially.

6. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The oil seal (7) is a skeleton oil seal.

7. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The first working oil passage (100) comprises a first oil hole, a second oil hole and a third oil hole, the first oil hole being arranged on the oil distribution shaft (1) and connected to the first opening (300), the second oil hole being arranged on the rotor (2), and the third oil hole being arranged on the feedback rod (8); the valve (9) being installed in the second oil hole.

8. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The second working oil passage (200) comprises a fourth oil passage and a fifth oil passage, the fourth oil passage is arranged on the oil distribution shaft (1), the fourth oil hole is connected to the second opening (400), and the fifth oil passage is arranged on the rotor (2); the valve (9) is installed in the fifth oil hole.

9. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The valve (9) comprises a hydraulically controlled non-return valve.

10. The OD box for an adjustable propeller shaft according to claim 1, characterized in that: The valve (9) is arranged axially.

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