A modular integrated lightweight marine gearbox

Abstract

The present invention relates to a modular integrated marine lightweight gearbox, comprising an input gear shaft component, a transmission gear shaft component, an output gear shaft component, and a housing component. The input gear shaft component comprises an input flange and an input shaft, wherein the inner hole of the input flange is connected to the input shaft via a spline with axial micro-slipping. The transmission gear shaft component comprises a transmission shaft, a transmission gear A, a clutch assembly A, a main gear assembly, and a sliding sleeve A, which are sequentially sleeved on the transmission shaft. The clutch assembly A comprises a clutch housing, a friction plate seat, a piston, a spring, inner friction plates, and outer friction plates. The clutch housing is integrated with the transmission gear A, and a circumferential wall of the clutch housing is provided with an elongated through hole. The friction plate seat is integrated with the main gear assembly, and the inner and outer friction plates are alternately arranged. The spring is disposed between the piston and the friction plate seat, and the piston pushes the inner and outer friction plates into close contact and compression. The present invention reduces the product volume, ensures smooth clutch oil drainage, and improves product reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and more particularly to a modular integrated lightweight marine gearbox. Background Art

[0002] The marine gearbox is an important transmission component on the ship. It forms the ship's transmission system with the marine diesel engine and plays an important role in the safe operation of the ship. The marine gearbox plays a role in changing the speed, changing the transmission direction, increasing the transmission torque, reversing and clutching, etc. It is a core component on the ship and its quality seriously affects the safe and reliable operation of the ship. At present, the marine gearbox is generally large in size. The assembly and adjustment are mainly based on manual experience, which is inefficient, costly, subjective and not very accurate. In addition, the input flange of the traditional marine gearbox is axially locked with the input shaft. After the input flange is connected to the main engine and the high-elastic coupling, axial over-positioning stress is generated due to installation errors, thermal expansion and contraction, etc., which reduces the reliability of the product. In addition, the clutch housing in the traditional marine gearbox is arranged with an oil drain "hole" on the circumferential wall. The defects are: (1) the oil drainage space is discontinuous, causing oil entrapment; (2) when machining the "hole", the burrs left on the surface of the internal spline are difficult to completely remove, which reduces the performance of the clutch and greatly reduces the reliability after long-term use. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a modular integrated marine lightweight gearbox with a compact structure, good clutch performance and high overall reliability.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] A modular integrated marine light gearbox, comprising an input gear shaft component, a transmission gear shaft component, an output gear shaft component and a housing component, wherein the input gear shaft component, the transmission gear shaft component and the output gear shaft component are arranged in the housing component, and the input gear shaft component, the transmission gear shaft component and the output gear shaft component are mutually meshed and driven by gears; the input gear shaft component comprises an input flange and an input shaft, the inner hole of the input flange and the input shaft are connected and driven by a spline with axial micro-slip, the transmission gear shaft component comprises a transmission shaft, and a left-mounted bearing A, a transmission gear A, a clutch assembly, which are sequentially sleeved on the transmission shaft A, main gear assembly, sliding sleeve A, right-mounted bearing A; the clutch assembly A includes a clutch housing, a friction plate seat, a piston, a spring, an inner friction plate and an outer friction plate; the clutch housing is integrated on the transmission gear A; a plurality of elongated through holes for clutch oil drainage are arranged at intervals on the circumferential wall of the clutch housing; the friction plate seat is integrated on the main gear assembly; the inner friction plate and the outer friction plate are respectively arranged on the external splines of the friction plate seat and in the clutch housing, and the inner friction plates and the outer friction plates are arranged alternately; the spring is arranged between the piston and the friction plate seat; the piston pushes the inner friction plate and the outer friction plate to be in close contact and pressed tightly.

[0006] As a preferred solution: the clutch assembly A further comprises a pressure plate, which is arranged at the right end of the clutch housing, and the end surface of the pressure plate at the inner diameter is 0.1-0.13 mm higher than the end surface at the outer diameter.

[0007] As a preferred solution: a first working medium pipeline is provided in the transmission shaft, and a chamfered notch is provided on the inner ring of the piston. The chamfered notch and the transmission gear A cavity form a medium channel for driving the piston shaft to move, and the first working medium pipeline is connected to the medium channel.

[0008] As a preferred solution: a plurality of lubrication holes for fully lubricating and cooling the friction plates are distributed on the friction plate holder, a second working medium pipeline is provided inside the transmission shaft, and the second working medium pipeline is communicated with the lubrication holes of the friction plate holder.

[0009] As a preferred solution: the main gear assembly is installed on the transmission shaft via a sliding sleeve A, the main gear assembly and the transmission shaft are clearance-matched, and thrust rings that can rotate independently of each other are also provided at both ends of the main gear assembly. The input shaft is also provided with a left-mounted bearing B, a transmission gear B, a clutch assembly B, an input shaft main gear assembly, a sliding sleeve B, a thrust ring B and a right-mounted bearing B.

[0010] As a preferred solution: the second working medium pipeline provided inside the input shaft is communicated with the axial micro-slip spline through a throttling plug, and the inner hole on one side of the input flange is sealed with a plug.

[0011] As a preferred solution: the box body component includes a front box cover and a rear box cover, and the dividing surface formed by the joint surface of the front box cover and the rear box cover makes the divided axial dimension ratio of the box body component L1:L2=0.8~1.2.

[0012] As a preferred solution: the rear box cover integrates the oil distributor seat for installing the control valve, the connecting seat for connecting the PTO interface, the shell for installing the oil filter, the second section of the oil suction pipe built into the box wall, and the oil inlet and outlet pipes of the oil pump.

[0013] As a preferred solution: one section of the second section of the oil suction pipe is connected to the first section of the oil suction pipe with the central suction port facing downward, the first section of the oil suction pipe is attached to the box wall, the oil suction slope of the first section of the oil suction pipe is 10 mm downward, and the elbow is fixed to the inner wall of the front box cover.

[0014] As a preferred solution: a connecting disc for connecting with circular covers of different specifications is fixed to the front end of the front box cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention integrates the clutch housing and the friction plate seat on the transmission gear and the main gear assembly respectively, reducing the product volume. At the same time, the present invention arranges a plurality of elongated through holes on the circumferential wall of the clutch housing, which can ensure smooth oil drainage of the clutch and reduce the probability of oil entrapment. At the same time, the elongated through holes are more convenient to process, the surface is smoother, and the processing accuracy is higher, which makes the clutch performance better. In addition, the present invention connects the input shaft and the inner hole of the input flange through a spline, so that the input flange and the input shaft have axial sliding space, which can compensate for the axial over-positioning stress of the input flange and the input shaft caused by installation errors, thermal expansion and contraction and other factors, further improving the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a transmission gear shaft component of the present invention;

[0020] Figure 3 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] In addition, 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 to 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] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0025] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] like Figure 1 and Figure 2 As shown, a modular integrated marine light gearbox includes an input gear shaft component 1, a transmission gear shaft component 2, an output gear shaft component 3 and a box body component 4, wherein the input gear shaft component 1, the transmission gear shaft component 2, and the output gear shaft component 3 are arranged in the box body component 4, and the input gear shaft component 1, the transmission gear shaft component 2 and the output gear shaft component 3 are mutually engaged and transmitted through gears; it is characterized in that the input gear shaft component 1 includes an input flange 18 and an input shaft 11, the inner hole of the input flange 18 and the input shaft 11 are connected and transmitted through an axial micro-slip spline 111, and the transmission gear shaft component 2 includes a transmission shaft 21, and a left-mounted bearing A22, a transmission gear A23, a clutch assembly A24, a main gear assembly 25, and a sliding sleeve A2 which are sequentially sleeved on the transmission shaft 21. 6. Right-mounted bearing A27; the clutch assembly A24 includes a clutch housing 231, a friction plate holder 251, a piston 241, a spring 242, an inner friction plate 243 and an outer friction plate 244. The clutch housing 231 is integrated on the transmission gear A23. A plurality of elongated through holes for clutch oil drainage are arranged at intervals on the circumferential wall of the clutch housing 231. The friction plate holder 251 is integrated on the main gear assembly 25. The inner friction plates 243 and the outer friction plates 244 are respectively arranged on the external splines of the friction plate holder 251 and in the clutch housing 231, and the inner friction plates 243 and the outer friction plates 244 are arranged alternately; the spring 242 is arranged between the piston 241 and the friction plate holder 251, and the piston 241 pushes the inner friction plates 243 and the outer friction plates 244 to close and press them tightly.

[0029] The clutch assembly A24 also includes a pressure plate, which is positioned at the right end of the clutch housing 231. The inner diameter end surface of the pressure plate 245 is 0.1 to 0.13 mm higher than the outer diameter end surface. Traditional marine gearbox clutch housings have a pressure plate arranged as a vertical plane. During clutch operation, the oil cylinder, under pressure, pushes the piston to compress the friction plate and the pressure plate. The pressure plate is deformed by force and tilted, resulting in uneven force on the friction plate and affecting clutch performance. The inventive design of the micro-displacement tilt angle of the gearbox clutch pressure plate compensates for this tilt, making the friction plate more evenly stressed and further improving clutch performance.

[0030] A first working medium pipeline is provided inside the transmission shaft 21, and a chamfered notch is provided on the inner ring of the piston 241. The chamfered notch and the transmission gear A23 cavity form a medium channel for driving the piston 241 to move axially, and the first working medium pipeline is connected to the medium channel.

[0031] The friction plate holder 251 is provided with a plurality of lubrication holes for fully lubricating and cooling the friction plate. A second working medium pipeline is provided inside the transmission shaft 21 , and the second working medium pipeline is communicated with the lubrication holes of the friction plate holder 251 .

[0032] The main gear assembly 25 is mounted on the transmission shaft 21 via a sliding sleeve A26, with a clearance fit between the main gear assembly 25 and the transmission shaft 21. Thrust rings 28 are also provided at both ends of the main gear assembly 25, allowing for independent rotation. The input gear shaft component 1 has the same structure as the transmission shaft component 2. The input shaft 11 is also fitted with a left-mounted bearing B, a transmission gear B, a clutch assembly B, an input shaft main gear assembly 15, a sliding sleeve B16, a thrust ring B, and a right-mounted bearing B. The second working medium pipeline within the input shaft 11 communicates with an axial micro-slip spline 111 via a throttle plug 112. The inner bore of the input flange 18 is sealed with a plug 181.

[0033] The housing assembly 4 comprises a front housing cover 41 and a rear housing cover 42. The cross-section formed by the joint between the front and rear housing covers 41 and 42 results in an axial dimension ratio (L1:L2) of 0.8 to 1.2. Conventional small marine gearboxes have a longitudinal cross-section ratio (L1:L2) greater than 1.5 for the main housing and the housing cover. This weakens the overall housing assembly's support stiffness and reduces product vibration and noise performance. The present invention overcomes this drawback by longitudinally splitting the gearbox housing assembly along a principle close to the mid-section.

[0034] A connecting disc 411 is fixed to the front end of the front tank cover 41 for connecting to a circular housing 43 of varying specifications. The rear tank cover 42 integrates an oil distributor seat 421 for mounting a control valve, a connection seat 422 for connecting a PTO interface, a housing 423 for mounting an oil filter, a second section of an oil suction pipe 424 embedded in the tank wall, and an oil pump inlet and outlet pipe 425. While meeting all functional requirements, the design goals of lightweighting, compact structure, and reliable performance are achieved.

[0035] Traditional gearboxes consist of separate components, including the oil distributor housing, input shaft rear end cap, drive shaft rear end cap, outsourced filter assembly, and oil suction pipe assembly, all arranged within the housing. This creates numerous components and connection surfaces, leading to increased weight, increased sources of oil leakage, and reduced housing strength. The gearbox of the present invention utilizes a rear housing cover structure that integrates multiple functional modules, overcoming these drawbacks.

[0036] One section of the second oil suction pipe section 424 is connected to a first section of the oil suction pipe section 47, with the suction port facing downward. This section of the oil suction pipe section 47 is bent in the Y and Z directions into a "2-L" shape and attached to the gearbox wall. The suction bevel of the oil suction pipe section 47 is tilted downward, leaving a 10mm gap, and the elbow is fixed to the inner wall of the front gearbox cover 41. Conventional gearboxes do not have an oil suction pipe immersed in the oil sump. To avoid the large output gear, the oil suction port is located on the side. This can cause the oil pump to drain during ship vibrations, compromising gearbox reliability. The present invention's design of a first section of the oil suction pipe, with the suction port facing downward, overcomes this drawback.

[0037] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0038] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Those skilled in the art may 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. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A modular integrated marine light gearbox, comprising an input gear shaft component (1), a transmission gear shaft component (2), an output gear shaft component (3) and a housing component (4), wherein the input gear shaft component (1), the transmission gear shaft component (2) and the output gear shaft component (3) are arranged in the housing component (4), and the input gear shaft component (1), the transmission gear shaft component (2) and the output gear shaft component (3) are meshed with each other through gears for transmission; characterized in that: The input gear shaft component (1) includes an input flange (18) and an input shaft (11), and the inner hole of the input flange (18) is connected to the input shaft (11) through a spline (111) with axial micro-slip. The transmission gear shaft component (2) includes a transmission shaft (21), and a left-mounted bearing A (22), a transmission gear A (23), a clutch assembly A (24), a main gear assembly (25), a sliding sleeve A (26), and a right-mounted bearing A (27) sequentially sleeved on the transmission shaft (21); the clutch assembly A (24) includes a clutch housing (231), a friction plate seat (251), a piston (241), a spring (242), an inner friction plate (243), and an outer friction plate (2 44), the clutch housing (231) is integrated on the transmission gear A (23), a plurality of elongated through holes for clutch oil discharge are arranged at intervals on the circumferential wall of the clutch housing (231), the friction plate seat (251) is integrated on the main gear assembly (25), the inner friction plate (243) and the outer friction plate (244) are respectively arranged on the outer spline of the friction plate seat (251) and in the clutch housing (231), and the inner friction plate (243) and the outer friction plate (244) are arranged alternately; a spring (242) is arranged between the piston (241) and the friction plate seat (251), and the piston (241) pushes the inner friction plate (243) and the outer friction plate (244) to be in close contact and compaction; The clutch assembly A (24) further includes a pressure plate, which is arranged at the right end of the clutch housing (231), and the end surface of the pressure plate (245) at the inner diameter is 0.1 to 0.13 mm higher than the end surface at the outer diameter; The main gear assembly (25) is mounted on the transmission shaft (21) via a sliding sleeve A (26). The main gear assembly (25) and the transmission shaft (21) are clearance-matched. Thrust rings (28) capable of rotating independently of each other are also provided at both ends of the main gear assembly (25). The input shaft (11) is also sleeved with a left-mounted bearing B, a transmission gear B, a clutch assembly B, an input shaft main gear assembly (15), a sliding sleeve B (16), a thrust ring B, and a right-mounted bearing B.

2. The modular integrated marine lightweight gearbox according to claim 1, characterized in that: A first working medium pipeline is provided in the transmission shaft (21), and a chamfered notch is provided on the inner ring of the piston (241). The chamfered notch and the cavity of the transmission gear A (23) form a medium channel for driving the piston (241) to move axially, and the first working medium pipeline is communicated with the medium channel.

3. The modular integrated marine lightweight gearbox according to claim 1, characterized in that: The friction plate seat (251) is provided with a plurality of lubrication holes for fully lubricating and cooling the friction plate. A second working medium pipeline is provided inside the transmission shaft (21), and the second working medium pipeline is communicated with the lubrication holes of the friction plate seat (251).

4. The modular integrated marine lightweight gearbox according to claim 1, characterized in that: The second working medium pipeline provided inside the input shaft (11) communicates with the axial micro-slip spline (111) via a throttle plug (112), and the inner hole on one side of the input flange (18) is sealed with a plug (181).

5. The modular integrated marine lightweight gearbox according to claim 1, characterized in that: The box body component (4) includes a front box cover (41) and a rear box cover (42), and the split surface formed by the joint surface of the front box cover (41) and the rear box cover (42) makes the split axial dimension ratio of the box body component (4) L1:L2=0.8~1.

2.

6. The modular integrated marine lightweight gearbox according to claim 5, characterized in that: The rear box cover (42) integrates an oil distributor seat (421) for installing a control valve, a connection seat (422) for connecting a PTO interface, a housing (423) for installing an oil filter, a second section of an oil suction pipe (424) built into the box wall, and an oil pump oil inlet and outlet pipe (425).

7. The modular integrated marine lightweight gearbox according to claim 6, characterized in that: One section of the second section of the oil suction pipe (424) is connected to the first section of the oil suction pipe (47) with the suction port facing downwards. The first section of the oil suction pipe (47) is attached to the box wall. The oil suction groove of the first section of the oil suction pipe (47) is vacated 10 mm downwards, and the elbow is fixed to the inner wall of the front box cover (41).

8. The modular integrated marine lightweight gearbox according to claim 5, characterized in that A connecting disc (411) for connecting with circular covers (43) of different specifications is fixed to the front end of the front box cover (41).

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