Planetary gear device mounting structure and transmission

Abstract

Provided are a planetary gear device mounting structure and a transmission. The planetary gear device mounting structure includes: a case including a ring-shaped case inner circumferential portion and a case inner side portion having an axial end surface; a ring gear that is torsionally connected to the case inner circumferential portion; and a gasket that is formed in a ring shape, is disposed between the case and an end portion of the ring gear in the axial direction of the ring gear, and has the ring gear abutting against the gasket and the gasket abutting against the case inner side portion. An annular first oil groove is provided in the gasket, an opening of the first oil groove faces the ring gear, and the axial direction is perpendicular to the vertical direction, so that lubricating oil that flows to the end portion of the ring gear can flow to the bottom of the case via the first oil groove under the action of gravity.

Description

Technical Field

[0001] This application relates to the field of transmission technology, and in particular to planetary gear assembly mounting structures and gearboxes. Background Technology

[0002] A vehicle's transmission may include a housing and a planetary gear set within the housing. The planetary gear set includes a ring gear, the outer periphery of which meshes with the inner periphery of the housing to restrict the ring gear's circumferential movement. One end of the ring gear directly abuts against the inner wall of the housing, and its axial position is restricted by a retaining ring. The planetary gear set may also include a planet carrier, which can serve as the output component of the planetary gear set.

[0003] The gear ring is generally made of harder steel, while the housing is generally made of softer aluminum or magnesium alloy. The teeth on the inner circumference of the gear ring are helical teeth. During the meshing process between the gear ring and the planetary gears inside, axial and radial forces are generated simultaneously, causing the end face of the gear ring to repeatedly press against the end face of the housing, resulting in fretting wear on the softer end face of the housing.

[0004] Aluminum alloy particles generated by wear can contaminate the lubricating oil, leading to a decrease in the cleanliness of the oil-cooled motor system. Furthermore, wear can cause NVH (noise, vibration, and harshness) problems during gear meshing within the planetary gear unit. When wear reaches a certain level, the gear ring can also experience axial movement, resulting in gearbox failure. Utility Model Content

[0005] To solve or alleviate at least one of the technical problems mentioned in the background art, this application provides a planetary gear assembly mounting structure and a gearbox.

[0006] The planetary gear device mounting structure provided in this application includes: a housing, which includes an annular inner periphery and an inner side of the housing with an axial end face; a gear ring, which is torsionally connected to the inner periphery of the housing; and a gasket, which is formed in an annular shape and disposed between the ends of the housing and the gear ring along the axial direction of the gear ring, with the gear ring abutting against the gasket and the gasket abutting against the inner side of the housing. The gasket is provided with an annular first oil groove, the opening of the first oil groove facing the gear ring, and the axial direction being perpendicular to the vertical direction, so that the lubricating oil flowing to the end of the gear ring can flow to the bottom of the housing through the first oil groove under the action of gravity.

[0007] In at least one embodiment, the first oil tank includes a first oil tank protrusion protruding toward the inner side of the housing, and the inner side of the housing is provided with an annular first mounting groove, the first oil tank protrusion being embedded in the first mounting groove.

[0008] In at least one embodiment, the gasket is provided with a plurality of second oil grooves extending radially along the gasket, the second oil grooves communicating with the first oil grooves.

[0009] In at least one embodiment, the connection point between the first oil tank and the second oil tank is located at the center of the second oil tank.

[0010] In at least one embodiment, the second oil groove extends inward to the inner periphery of the gasket and outward to the outer periphery of the gasket.

[0011] In at least one embodiment, in the axial direction of the gear ring, the projection of the gear ring end face that abuts against the gasket is located in the projection of the gasket.

[0012] In at least one embodiment, in the axial direction, the end face of the gear ring is spaced apart from the external meshing teeth on the outer periphery of the gear ring, and the end face of the gear ring is spaced apart from the internal meshing teeth on the inner periphery of the gear ring.

[0013] In at least one embodiment, the inner periphery of the housing includes a plurality of housing grooves, and the plurality of second oil grooves are in communication with at least a portion of the housing grooves.

[0014] In at least one embodiment, the second oil tank includes a second oil tank protrusion protruding toward the inner side of the housing, the inner side of the housing being provided with a plurality of second mounting grooves extending radially, the second oil tank protrusion being embedded in the second mounting grooves.

[0015] The gearbox provided in this application includes the aforementioned planetary gear assembly mounting structure.

[0016] In the mounting structure provided in this application, the gear ring and the housing do not directly contact each other, significantly reducing friction and wear between them. If the gasket wears, it can be replaced individually, making maintenance more convenient. The annular oil groove in the gasket facilitates the recovery and diversion of lubricating oil. Through the above structural optimization, this mounting structure improves the installation stability, lubrication efficiency, and maintenance convenience of the planetary gear unit. Attached Figure Description

[0017] Figure 1 This is an exploded view of the planetary gear assembly mounting structure according to an embodiment of this application.

[0018] Figure 2 This is a cross-sectional view of the planetary gear assembly mounting structure according to an embodiment of this application.

[0019] Figure 3 This is a partial enlarged view of the gasket of the planetary gear device mounting structure according to an embodiment of this application, showing the side with an opening.

[0020] Figure 4 This is a partial enlarged view of the inner side of the housing of the planetary gear assembly mounting structure according to an embodiment of this application.

[0021] Figure 5 This is a schematic diagram showing the gasket of the planetary gear assembly mounting structure according to an embodiment of this application installed inside the housing.

[0022] Figure 6 This is a partial enlarged view of the gasket of the planetary gear device mounting structure according to an embodiment of this application, showing the side where the protrusion is located.

[0023] Figure 7 This is a front view of the planetary gear assembly mounting structure according to an embodiment of this application, which conceals the gear ring.

[0024] Figure 8 This is an isometric view of a planetary gear assembly mounting structure according to an embodiment of this application, which conceals the gear ring.

[0025] Explanation of reference numerals in the attached figures

[0026] 10. Enclosure;

[0027] 110 Inner perimeter of the enclosure; 111 Slot; 120 Inner side of the enclosure; 121 First mounting slot; 122 Second mounting slot; 130 Enclosure toothed groove;

[0028] 20 Gear Ring;

[0029] 210 Gear ring end face; 220 Gear ring external meshing teeth; 230 Gear ring internal meshing teeth;

[0030] 30 gaskets;

[0031] 310 First oil groove; 311 First oil groove protrusion; 320 Second oil groove; 321 Second oil groove protrusion; 330 Inner periphery; 340 Outer periphery

[0032] 40 clasps Detailed Implementation

[0033] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0034] This application provides a planetary gear assembly mounting structure and a gearbox including the aforementioned mounting structure.

[0035] See Figure 1The planetary gear assembly mounting structure may include a housing 10, a gear ring 20, and a gasket 30. See also... Figure 2 The housing 10 may include an annular inner peripheral portion 110 and an inner inner side portion 120 having an axial end face. A gear ring 20 is torsionally connected to the inner peripheral portion 110 to ensure that the two do not rotate relative to each other; for example, a torsionally connected connection can be achieved via a spline. The gasket 30 may be formed as an annular ring.

[0036] See Figure 2 Along the axial direction A of the gear ring 20, the gasket 30 is sandwiched between the housing 10 and the end of the gear ring 20, with one end of the gasket 30 directly abutting the gear ring 20 and the other end directly abutting the inner side 120 of the housing, forming a stable axial support structure.

[0037] See Figure 2 , Figure 3 The gasket 30 is provided with an annular first oil groove 310, the opening of which faces the gear ring 20. Furthermore, the gearbox is configured such that the axial direction A is perpendicular to the vertical direction, and under the action of gravity, the lubricating oil flowing to the end of the gear ring 20 can flow smoothly into the bottom of the gearbox 10 through the first oil groove 310, thereby achieving effective recovery and guidance of the lubricating oil.

[0038] To further reduce wear, the hardness of the shim 30 can be less than the hardness of the end face of the toothed ring 20 it contacts. For example, the shim 30 can be made of steel. Of course, other suitable materials can be selected according to actual working conditions.

[0039] In the mounting structure provided in this application, the gear ring 20 and the housing 10 do not directly contact each other, significantly reducing friction and wear between them. If the gasket 30 wears, it can be replaced separately, making maintenance more convenient. Through the above structural optimization, this mounting structure improves the installation stability, lubrication efficiency, and maintenance convenience of the planetary gear unit.

[0040] In some implementations, see Figure 6 The first oil tank 310 includes a first oil tank protrusion 311 protruding towards the inner side 120 of the tank. This protrusion can be the bottom of the oil tank and can also be annular. See also Figure 4 The inner side of the housing 120 is provided with a corresponding annular first mounting groove 121, the size and shape of which are adapted to the first oil groove protrusion 311. During assembly, the first oil groove protrusion 311 is embedded in the first mounting groove 121. This fitting method can limit the position of the gasket 30 in the axial and radial directions, enhance the stability of the gasket 30, and improve the reliability of the entire system.

[0041] In some implementations, see Figure 3The gasket 30 is provided with a plurality of second oil grooves 320 extending radially along the gasket 30 (including cases where the second oil grooves 320 extend approximately radially along the gasket 30). These second oil grooves 320 can be evenly distributed on the circumference of the gasket 30, forming a radial arrangement. The second oil grooves 320 can communicate with the first oil grooves 310, thereby forming a continuous lubricating oil path and improving the lubricating oil flow efficiency.

[0042] In some implementations, see Figure 6 The second oil tank 320 includes the inner part 120 facing the inside of the tank (see...). Figure 2 The second oil groove protrusion 321 protrudes, which may be the bottom of the oil groove. See also Figure 4 The inner side portion 120 of the housing is provided with a plurality of radially extending second mounting grooves 122 (including cases where the second mounting grooves 122 extend generally radially), the position, size, and shape of which are adapted to the second oil groove protrusion 321. During assembly, the second oil groove protrusion 321 is embedded in the second mounting groove 122, further restricting the position of the gasket 30 in the circumferential direction. The dual positioning structure of the first mounting groove 121 and the second mounting groove 122 significantly enhances the stability of the gasket 30.

[0043] Compared to methods of fixing gaskets with adhesive or bolts, the installation method using a convex-recessed joint in this application offers significantly greater ease of assembly and disassembly. Furthermore, this joint method avoids reliability issues caused by adhesive aging or bolt loosening, improving equipment maintainability and lifespan. The gasket 30 has a simple structure; for example, it can be formed in one piece using a stamping process, resulting in low cost, high efficiency, and suitability for large-scale production and application.

[0044] In some implementations, see Figure 3 The connection point between the first oil groove 310 and the second oil groove 320 is located at the center of the second oil groove 320. This central connection design ensures that lubricating oil can flow into the annular first oil groove 310 in a timely manner, avoiding oil flow deviation or local stagnation. This careful oil passage layout also simplifies the manufacturing and assembly process, as the symmetry of the connection point reduces the complexity of machining and positioning. Alternatively, the connection point can be located outside the center of the second oil groove 320, for example, by increasing or decreasing the diameter of the first oil groove 310, making the first oil groove 310 more outward or inward.

[0045] In some implementations, see Figure 3 The second oil groove 320 extends inward to the inner periphery 330 of the gasket 30 and outward to the outer periphery 340 of the gasket 30, further eliminating dead corners and improving the flow efficiency of lubricating oil. This through-type design also simplifies the processing technology of the oil groove, makes it easier to achieve consistency, and facilitates mass production.

[0046] In some implementations, see Figure 2 Along the axial direction A of the gear ring 20, the projection of the gear ring end face 210 of the gear ring 20, which is used to abut against the gasket 30, is located in the projection of the gasket 30. This design ensures that the gear ring end face 210 and the housing 10 are separated by the gasket, avoiding wear on the housing 10, and allowing the lubricating oil on the gear ring 20 to smoothly enter the oil groove on the gasket 30 when it reaches the gear ring end face 210.

[0047] Furthermore, in order to achieve the above projection relationship, the meshing teeth on the gear ring 20 can be spaced at a certain distance from the end face 210 of the gear ring, thereby reducing the size of the end face 210 of the gear ring. For example, in the axial direction A, the end face 210 of the gear ring is spaced apart from the external meshing teeth 220 on the outer periphery of the gear ring 20, and the end face 210 of the gear ring is spaced apart from the internal meshing teeth 230 on the inner periphery of the gear ring 20.

[0048] In some implementations, see Figure 5 , Figure 7 , Figure 8 The inner periphery 110 of the housing includes a plurality of housing grooves 130, and a plurality of second oil grooves 320 communicate with at least a portion of the housing grooves 130 to form a continuous lubrication oil path. For example, the number of housing grooves 130 is twice the number of second oil grooves 320, such that one housing groove 130 in every two housing grooves 130 can communicate with one second oil groove 320.

[0049] In some implementations, see Figure 1 , Figure 2 The planetary gear mounting structure may also include a retaining ring 40, which can be installed in a pre-set groove 111 in the inner peripheral portion 110 of the housing and abuts against the other axial end of the gear ring 20. Figure 2 The end face of the left end of the gear ring 20 is used to limit the axial position of the gear ring 20 and prevent the gear ring 20 from moving axially.

[0050] In some embodiments, the radii of curvature of the first oil groove protrusion 311 and the first mounting groove 121 can be adjusted. For example, the radius of curvature of the first oil groove protrusion 311 can be made slightly larger than the radius of curvature of the first mounting groove 121, so that the first oil groove protrusion 311 is not completely inserted into the first mounting groove 121. When the gasket 30 and the housing 10 abut against each other, the first oil groove protrusion 311 deforms slightly, so that the gasket 20 as a whole provides an axial elastic force, which can further limit the axial position of the gear ring 20 and prevent the gear ring 20 from moving axially. The second oil groove protrusion 321 is similar to the second mounting groove 122, and will not be described again in this application.

[0051] The gearbox provided in this application may include the aforementioned planetary gear assembly mounting structure. The gearbox may employ a layout where the input shaft and output shaft are coaxially aligned.

[0052] The above are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A planetary gear device mounting structure characterized by comprising: The planetary gear device installation structure includes: a case including a ring-shaped case inner circumferential portion and a case inner side portion having an axial end surface; a ring gear that is torsionally connected to the case inner circumferential portion; a gasket that is formed in a ring shape, is disposed between the case and an end portion of the ring gear in the axial direction of the ring gear, and is in contact with the ring gear, and is in contact with the case inner side portion, a first oil groove is provided in the gasket in a ring shape, an opening of the first oil groove faces the ring gear, the axial direction is perpendicular to the vertical direction, so that lubricating oil flowing to the end portion of the ring gear can flow to the bottom of the case via the first oil groove under the action of gravity.

2. The planetary gear device mounting structure according to claim 1, characterized by The first oil groove includes a first oil groove protrusion that protrudes toward the case inner side portion, and the case inner side portion is provided with a first installation groove that extends in the radial direction, and the first oil groove protrusion is embedded in the first installation groove.

3. The planetary gear device mounting structure according to claim 1, characterized by A plurality of second oil grooves that extend in the radial direction of the gasket are provided in the gasket, and the second oil grooves communicate with the first oil groove.

4. The planetary gear device mounting structure according to claim 3, characterized by The connection point of the first oil groove and the second oil groove is located at the center of the second oil groove.

5. The planetary gear device mounting structure according to claim 3, characterized by The second oil groove extends inwardly to the inner circumferential edge of the gasket and outwardly to the outer circumferential edge of the gasket.

6. The planetary gear device mounting structure according to claim 3, characterized by In the axial direction of the ring gear, the projection of the ring gear end surface for contacting the gasket is located in the projection of the gasket.

7. The planetary gear device mounting structure according to claim 6, characterized by In the axial direction, the ring gear end surface is spaced apart from the ring gear outer engagement teeth on the outer circumferential portion of the ring gear, and the ring gear end surface is spaced apart from the ring gear inner engagement teeth on the inner circumferential portion of the ring gear.

8. The planetary gear device mounting structure according to claim 3, characterized by The case inner circumferential portion includes a plurality of case tooth grooves, and the plurality of second oil grooves communicate with at least part of the case tooth grooves.

9. The planetary gear device mounting structure according to claim 3, characterized by The second oil groove includes a second oil groove protrusion that protrudes toward the case inner side portion, and the case inner side portion is provided with a plurality of second installation grooves that extend in the radial direction, and the second oil groove protrusion is embedded in the second installation groove.

10. A gearbox characterized in that, The planetary gear device installation structure includes any one of claims 1 to 9.

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