A transmission device

Abstract

The present invention relates to the field of automobile transmission technology, and provides a transmission device, which arranges a differential module and a planetary reducer module coaxially and semi-embedded, and is further provided with an oil guide ring on the differential housing, which can collect and guide the collected lubricating oil to the first oil channel in the planetary shaft, and guide the lubricating oil to the external needle bearing through the first oil channel, and the lubricating oil is then released from both ends of the needle bearing, so as to be further dispersed to other areas in the main housing, and the main housing is also provided with an active oil guide path pointing to the oil guide ring. The transmission device provided by the present invention is provided with an oil guide ring on the differential housing, and is provided with an active oil guide path pointing to the oil guide ring, which can effectively collect and guide the lubricating oil to be transported to the needle bearing outside the planetary shaft, and can also ensure the flow balance and effectiveness of the lubricating oil inside the main housing under low speed conditions, and can provide convenience for the application of coaxially arranged planetary gear reducers and differentials.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile transmission, and in particular to a transmission device. Background Art

[0002] As the automotive industry develops in the direction of low carbon and intelligence, new energy vehicles have gradually become the new favorite of major automakers, and there are more stringent requirements on the weight, performance and size of the drive devices used in new energy vehicles.

[0003] The coaxial planetary gear reducer arranges the planetary reducer and the differential coaxially. It has a compact structure and coaxial input and output, and is often used as an electric vehicle reducer. However, due to the compact structure design, its internal space is small, which reduces the amount of lubricating oil. Under the original lubrication design, its lubrication effect will be lower than that of the non-compact design, which is not conducive to the development of coaxial planetary gear reducers. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a transmission device to solve the problem that the design of the coaxial planetary gear reducer in the prior art will reduce its lubrication effect and is not conducive to the development of the coaxial planetary gear reducer.

[0005] The present invention provides a transmission device, comprising: a differential module and a planetary reducer module arranged in a main housing, and a first output shaft and a second output shaft coaxially arranged for connecting wheels, wherein:

[0006] The differential module includes a differential housing and a differential gear set, wherein the differential housing is rotatably connected to the first output shaft and the second output shaft, a first shaft body perpendicular to the first output shaft is fixedly arranged in the differential housing, a first gear in the differential gear set is rotatably arranged on the first shaft body, a second gear in the differential gear set is coaxially fixedly connected to the first output shaft and the second output shaft respectively, and the first gear is meshingly connected to the second gear;

[0007] The planetary reducer module comprises a sun gear coaxially fixedly connected to the input shaft, and a first planet gear and a second planet gear coaxially fixedly formed as a double gear structure, the first planet gear is meshedly connected to the sun gear, the second planet gear is meshedly connected to the gear ring arranged on the inner wall of the main housing, the input shaft is rotatably sleeved on the first output shaft, and the diameter of the first planet gear is greater than the diameter of the second planet gear;

[0008] The first planetary gear and the second planetary gear are also rotatably disposed on the differential housing, and the second planetary gear and the first gear are also alternately arranged around the circumference of the first output shaft, so that the differential gear set is embedded in the space between the second planetary gear and the first output shaft, thereby reducing the axial dimensions of the differential module and the planetary reducer module;

[0009] The double gear structure is also sleeved on the planetary shaft through a needle bearing, the planetary shaft is fixedly connected to the differential housing, a first oil passage is arranged inside the planetary shaft, an oil outlet hole connected to the first oil passage is arranged on the side wall, and an oil inlet hole connected to the first oil passage is arranged at the end, so as to connect the lubricating oil inside the main housing through the oil inlet hole and guide the lubricating oil to the inner area of ​​the needle bearing;

[0010] The differential housing is also provided with an oil guide ring, which includes an oil baffle structure and a second oil guide hole, so as to collect lubricating oil inside the main housing through the oil baffle structure and guide the collected lubricating oil into the first oil channel through the second oil guide hole;

[0011] The main housing is also provided with a first oil guide hole connected to the active oil guide path, and the first oil guide hole points to the oil retaining structure of the oil guide ring;

[0012] Wherein, the active oil guide path also includes a first oil guide channel and an outer oil guide cavity;

[0013] A portion of the inner side wall of the main housing is protruded outward to form a first oil pool, and an input end of the first oil guide passage is connected to the first oil pool through an external oil pump module;

[0014] The differential housing is rotatably connected to the main housing via two main bearings, the outer oil guide chamber is arranged between the outer side of the main bearing and the main housing, and the output end of the first oil guide passage is connected to the outer oil guide chamber;

[0015] The first oil guide hole is around the outer side of the outer ring of the main bearing and extends from the outer oil guide cavity to the inner side of the main bearing. A first oil pipe is arranged in the first oil guide hole, and the first oil pipe extends to the oil retaining structure of the oil guide ring.

[0016] Optionally, the oil baffle structure includes a side wall of the oil guide ring, and a baffle plate matched with the end surface of the differential case, the baffle plate is arranged around the inner side of the side wall of the oil guide ring, and the side wall portion of the oil guide ring also protrudes outward to form an oil collecting groove, the setting position and number of the oil collecting grooves correspond one-to-one to the setting position and number of the planetary shafts, and the second oil guide hole is connected to the oil collecting groove.

[0017] Optionally, an inner oil guide cavity is further provided between the inner side of the main bearing and the differential housing, and the output end of the first oil guide channel is also connected to the inner oil guide cavity.

[0018] Optionally, the oil outlet hole of the first oil channel is arranged at a middle position of the needle roller bearing and is aligned with the needle roller sleeve of the needle roller bearing.

[0019] Optionally, a step structure is provided on one end surface of the planetary shaft, and a limiting gasket is also provided on the lower step surface of the step structure. The limiting gasket is clamped and fixed between the planetary shaft and the counterpart to limit the rotation of the planetary shaft relative to the differential housing through the step structure and the limiting gasket.

[0020] Optionally, the differential housing and the main housing are rotatably connected via two main bearings, an inwardly protruding bearing mounting ring is provided at one end of the main housing, and one of the main bearings is sleeved and fixed outside the bearing mounting ring, wherein a notch is also provided on the circumference of the bearing mounting ring for lubricating the shaft provided on the inner ring of the bearing mounting ring, and a first oil retaining rib is also provided on the inner wall of the main housing, and the setting position of the first oil retaining rib is consistent with the setting position of the notch.

[0021] Optionally, the differential housing and the main housing are rotatably connected via two main bearings, and a first buffer pad is provided between the outer walls of the two main bearings and the corresponding housings, the first buffer pad comprising an internal rubber portion and an external metal covering, the rubber portion being a multi-layer stacked structure, and the stacking direction being the axial direction of the first output shaft.

[0022] Optionally, a second buffer pad is further arranged between the outer wall of the gear ring and the main housing, and the second buffer pads are arranged in pairs at least on the positioning diameter of the gear ring.

[0023] Optionally, the differential housing includes a first differential housing and a second differential housing, the planetary reducer module is installed on the first differential housing, the second differential housing is embedded in the first differential housing, and a matching semicircular groove structure is provided on the mating surface of the first differential housing and the second differential housing to form a first axial hole for installing the first shaft body after the semicircular groove structure is docked, wherein the planetary reducer module is a three-planetary structure, and the three first shaft bodies are fixed in a Y-shaped structure.

[0024] The transmission device provided by the present invention includes: a differential module and a planetary reducer module arranged in a main housing, and a first output shaft and a second output shaft for connecting wheels and arranged coaxially, wherein the differential module and the planetary reducer module are coaxially arranged based on the first output shaft and the second output shaft, and the differential gear set is also alternately arranged with the planetary gears of the planetary accelerator module, which can be embedded in the space between the planetary reducer module and the first output shaft, thereby reducing the axial size of the differential module and the planetary reducer module; the planetary gear is also sleeved on the planetary shaft through a needle roller bearing, the planetary shaft is fixedly connected to the differential housing, and a first gear is arranged inside the planetary shaft. An oil passage, the side wall of which is provided with an oil outlet hole connected to the first oil passage, and the end is provided with an oil inlet hole connected to the first oil passage, so as to connect the lubricating oil inside the main housing through the oil inlet hole, and guide the lubricating oil to the internal area of ​​the needle bearing; wherein, an oil guide ring is also provided on the differential housing, and the oil guide ring includes an oil baffle structure and a second oil guide hole, so as to collect the lubricating oil inside the main housing through the oil baffle structure, and guide the collected lubricating oil to the first oil passage through the second oil guide hole, thereby improving the effectiveness of the lubricating oil entering the needle bearing, and the lubricating oil entering the needle bearing can be released from both ends of the needle bearing, so as to be further dispersed to other areas in the main housing. The transmission device provided by the present invention sets the planetary gear on the planetary shaft through a needle bearing, and sets a first oil channel in the planetary shaft, and sets an oil guide ring on the differential housing. The oil guide ring can collect lubricating oil and guide it to the first oil channel, and an active oil guide path is set in the main housing. When the overall speed is low, the reliability of lubricating oil delivery to the first oil channel in the planetary shaft can be guaranteed through the active oil guide path, thereby ensuring the flow balance of the lubricating oil inside the main housing, improving the lubrication effect of the compact coaxial planetary gear reducer, and providing convenience for the development and application of the coaxial planetary gear reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure principle of the transmission device in an embodiment of the present invention;

[0026] Figure 2 is a schematic cross-sectional structural diagram of a transmission device in an embodiment of the present invention;

[0027] Figure 3 It is a partial structural schematic diagram of a first main housing of a transmission device in an embodiment of the present invention;

[0028] Figure 4 is a partial structural schematic diagram of a second main housing of a transmission device in an embodiment of the present invention;

[0029] Figure 5 is a schematic structural diagram of a transmission part of a transmission device in an embodiment of the present invention;

[0030] Figure 6is a schematic structural diagram of an oil guide ring of a transmission device in an embodiment of the present invention;

[0031] Figure 7 is a schematic structural diagram of a first differential housing of a transmission device in an embodiment of the present invention;

[0032] Figure 8 is a schematic structural diagram of a second differential housing of a transmission device in an embodiment of the present invention;

[0033] Fig. 9 is a schematic structural diagram of a first shaft body of a transmission device in an embodiment of the present invention;

[0034] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] In order to solve the problem that the design of the coaxial planetary gear reducer in the prior art will reduce its lubrication effect, which is not conducive to the development of the coaxial planetary gear reducer. The present invention provides a transmission device, which is provided with a first oil channel in the planetary shaft, and an oil guide ring is provided on the end face of the planetary shaft. The lubricating oil is collected by the oil guide ring and guided to the first oil channel in the planetary shaft, and then transported to the needle bearing arranged outside the planetary shaft by the first oil channel. On the one hand, the lubrication effect of the needle bearing can be improved, and on the other hand, the flow rate of the lubricating oil diffused from both ends of the needle bearing can be increased, and the balance of the lubricating oil flow inside the main housing can be improved. Therefore, when the planetary reducer and the differential are coaxially and compactly arranged, the overall lubrication effect of each internal component can be guaranteed, which provides convenience for the application of the coaxial planetary gear reducer.

[0039] Specifically, Figure 1 and Figure 2 The figures are respectively a schematic diagram of the architecture principle and a schematic diagram of the cross-sectional structure of the transmission device of this embodiment, including a differential module and a planetary reducer module arranged in the main housing 10, and a first output shaft 21 and a second output shaft 22 which are coaxially arranged and used to connect to the wheels.

[0040] The differential module includes a differential housing 41 and a differential gear set. The differential housing 41 is rotatably connected to the first output shaft 21 and the second output shaft 22. A first shaft 43 perpendicular to the first output shaft 21 is fixedly arranged in the differential housing 41. The first gear 421 in the differential gear set is rotatably arranged on the first shaft 43. The second gear 422 in the differential gear set is coaxially and fixedly connected to the first output shaft 21 and the second output shaft 22 respectively. The first gear 421 is meshingly connected to the second gear 422.

[0041] The planetary reducer module includes a sun gear 31 coaxially fixedly connected to the input shaft 23, and a first planetary gear 32 and a second planetary gear 33 coaxially fixed as a double gear structure. The first planetary gear 32 is meshed with the sun gear 31, and the second planetary gear 33 is meshed with a ring gear 34 arranged on the inner wall of the main housing 10. The input shaft 23 is rotatably sleeved on the first output shaft 21. The diameter of the first planetary gear 32 is larger than the diameter of the second planetary gear 33, so that the second planetary gear 33 can surround and define an embedded space, and the differential gear set can be embedded in the embedded space.

[0042] Among them, the differential housing 41 is reused as the installation housing of the planetary reducer module, the first planetary gear 32 and the second planetary gear 33 are also rotatably arranged on the differential housing 41, and the second planetary gear 33 and the first gear 421 are also alternately arranged around the circumference of the first output shaft 21 to embed the differential gear set in the space between the second planetary gear 33 and the first output shaft 21, thereby reducing the axial dimensions of the differential module and the planetary reducer module.

[0043] Specifically, Figure 5 , Figure 7 and Figure 8 As shown, the differential housing 41 includes a first differential housing 411 and a second differential housing 412. The second differential housing 412 can be partially embedded in the first differential housing 411. On its mating surface, a first shaft body mounting position 401 and a second planetary gear mounting position 402 are arranged alternately along the circumference of the mating surface. In this embodiment, the second planetary gear 33 and the first gear 421 are each provided with three, corresponding to, as shown in FIG. Fig. 9 As shown, the three first shaft bodies 43 are fixedly connected to form a Y-shaped structure, which limit each other. There is no need to set other shaft limiting structures, which can reduce the cost of limiting the first shaft body 43. The center position of the Y-shaped structure is hollowed out to reduce its weight, release stress, improve its structural reliability, and can be used to limit the extended shaft body of the differential gear to improve the coaxiality of the differential gear. Among them, a first groove structure 431 is provided on the first shaft body 43, and the setting position is consistent with the setting position of the first gear 421 on the first shaft body 43, which can be used to ensure the introduction of lubricating oil to the inner ring of the first gear 421 to ensure the lubrication effect.

[0044] At the first shaft body installation position 401, the first differential housing 411 and the second differential housing 412 are both provided with semicircular groove structures on their mating surfaces, so that after the first differential housing 411 and the second differential housing 412 are docked, the semicircular groove structures can be merged into a first shaft hole for the installation of the first shaft body 43, and the three first shaft bodies 43 are fixedly connected into a Y-shaped structure, and in conjunction with the docking operation of the first differential housing 411 and the second differential housing 412, the installation of the three first shaft bodies 43 can be achieved in one step, thereby reducing the assembly cost.

[0045] At the second planetary gear mounting position 402, the mounting space provided for the second planetary gear is also respectively distributed on the first differential housing 411 and the second differential housing 412, which can increase the exposure rate of the mating surfaces of the first differential housing 411 and the second differential housing 412, reduce processing obstructions, and provide convenience for the processing of the first differential housing 411 and the second differential housing 412.

[0046] When the input shaft 23 rotates, the second planetary gear 33 rolls along the ring gear 34 through the transmission of the planetary reducer module, and then drives the differential case 41 to rotate through the planetary shaft 35. The differential case 41 then drives the first shaft 43 and the first gear 421 to rotate, and then the power can be transmitted to the first output shaft 21 and the second output shaft 22 through the differential gear set.

[0047] The double gear structure composed of the first planetary gear 32 and the second planetary gear 33 is mainly mounted on the planetary shaft 35 through a needle bearing sleeve. The planetary shaft 35 is fixedly connected to the differential housing 41 to avoid the influence of irregular rotation of the planetary shaft 35 on the power transmission speed ratio. A first oil channel 351 is arranged inside the planetary shaft 35, and an oil outlet hole connected to the first oil channel 351 is arranged on the side wall, and an oil inlet hole connected to the first oil channel 351 is arranged at the end to connect the lubricating oil inside the main housing 10 through the oil inlet hole to guide the lubricating oil to the internal area of ​​the needle bearing.

[0048] Among them, Figure 2 As shown, in this embodiment, a limiting gasket 46 is provided at one end of the planetary shaft 35, and the limiting gasket 46 is clamped and fixed between the planetary shaft 35 and the counterpart (including the second main bearing 132), and the end surface of the planetary shaft 35 is also provided with a step structure, and the rotation of the planetary shaft 35 relative to the differential housing 41 is limited by the step structure and the limiting gasket 46.

[0049] Please refer to further Figure 2 , Figure 5 and Figure 6 In this embodiment, an oil guide ring 45 is further provided on the differential housing 41. The oil guide ring 45 includes an oil baffle structure and a second oil guide hole 453, so as to collect the lubricating oil inside the main housing through the oil baffle structure, and guide the collected lubricating oil to the first oil channel 351 through the second oil guide hole 453. The lubricating oil entering the first oil channel 351 is further sent to the needle sleeve position of the needle bearing through the oil outlet hole of the first oil channel 351, and then led out from the needle sleeve position to the two end positions of the needle bearing (the needle sleeve is generally arranged in the middle position, and the led lubricating oil can be evenly delivered to both ends). After being led out, it can be sent to the first planetary gear 32 and the second planetary gear 33, and thrown out by the high-speed rotating first planetary gear 32 and the second planetary gear 33, and delivered inward to the differential gear set position, which can reduce the obstruction of the compact structure to the lubricating oil delivery and ensure the overall lubrication effect inside the main housing 10.

[0050] Specifically, the oil-blocking structure includes a side wall of an oil guide ring 45 and a baffle 452 matched with the end face of the differential housing. The baffle 452 is arranged around the inner side of the side wall of the oil guide ring 45, and the side wall portion of the oil guide ring 45 also protrudes outward to form an oil collecting groove 451. The setting position and number of the oil collecting grooves 451 correspond one-to-one to the setting position and number of the planetary shafts 35. The second oil guide hole 453 is connected to the oil collecting groove 451, and to ensure the oil guiding effect, the second oil guide hole 453 extends an oil guide pipe structure 454 into the planetary shaft 35, which can reduce the oil leakage at the gap in the connection area, ensure the reliability of conveying lubricating oil to the inside of the planetary shaft 35, and reduce the installation and sealing requirements from the oil guide ring 45 to the differential housing 41.

[0051] The oil guide ring 45 is fixedly connected to the differential housing 41 by a fixing pin 455. The shape of the baffle 452 is consistent with the inner edge of the mating surface of the differential housing 41, which can avoid the baffle 452 blocking other unnecessary lubricating oil delivery paths, and a positioning claw 456 is provided at the edge of the baffle 452 to facilitate pre-positioning through the positioning claw 456 when the oil guide ring 45 is installed.

[0052] Please refer to further Figure 3 and Figure 4 The main housing 10 is composed of a first main housing 11 and a second main housing 12. To facilitate the circulation of lubricating oil, part of the inner wall of the first main housing 11 is protruded outward to form a first oil pool 111. A first oil guide channel 113 is also provided in the first main housing 11. An input end 112 of the first oil guide channel 113 is connected to the first oil pool 111 through an external oil pump module. An output end of the first oil guide channel 113 (including a first output end 114 and a second output end 115) is connected to the enclosed space of the first main housing 11. A driving motor is correspondingly provided on the outside of the second main housing 12.

[0053] The differential housing 41 is rotatably connected to the main housing 10 via two main bearings, and an outer oil guide chamber is provided between the outer side of the first main bearing 131 and the main housing 10. The second output end 115 of the first oil guide channel 113 is connected to the outer oil guide chamber and can be used for lubrication of the first main bearing 131. An oil seal is provided on the outer side of the outer oil guide chamber to form an external oil seal.

[0054] A first oil guide hole 116 is also provided in the first main housing 11. The first oil guide hole 116 is provided around the outer side of the outer ring of the first main bearing 131 and extends from the outer oil guide cavity to the inner side of the first main bearing 131. A first oil pipe 117 is provided in the first oil guide hole 116. The first oil pipe 117 extends to the oil retaining structure of the oil guide ring 45, so that the lubricating oil in the outer oil guide cavity can be further guided and transported to the oil guide ring 45, and then sent to the planetary shaft 35 by the oil guide ring 45. After the internal lubrication cycle, it is collected in the first oil pool 111 and the next cycle is carried out through the external oil pump module.

[0055] Among them, the space of the outer oil guide chamber is relatively small. In order to ensure the smoothness of the lubricating oil delivery, a vent hole is also arranged on the first main shell 11. The vent hole is connected to the outer oil guide chamber, and a vent plug is arranged in the vent hole so that when the oil circuit is blocked due to gas obstruction, the gas in the oil circuit can be discharged through the vent plug.

[0056] The differential module and the planetary reducer module are mainly connected to the main housing 10 through the differential housing 41 and two main bearings. The ring gear 34 is fixedly arranged on the main housing 10, and other components are generally arranged at intervals from the main housing 10, so that an inner oil guide chamber is formed between the inner side of the first main bearing 131 and the differential housing 41. The first output end 114 of the first oil guide channel 113 is also connected to the inner oil guide chamber, which can improve the delivery efficiency of the lubricating oil to the inner side of the first main bearing 131 and ensure the lubrication efficiency.

[0057] Reinforcing ribs may also be provided in the gap areas between the main housing 10 and the components of the differential module and the planetary reducer module to enhance the structural strength of the main housing 10 .

[0058] In this embodiment, the inner ring of the first main bearing 131 is fixed to the differential housing 41, and the outer ring is fixed to the main housing 10. The outer ring of the second main bearing 132 is fixed to the differential housing 41, and the inner ring is fixed to the main housing 10. Correspondingly, a bearing mounting ring 121 protruding inward is provided on the second main housing 12. The inner ring of the second main bearing 132 is fixed to the bearing mounting ring 121. In order to ensure the lubrication of the input shaft 23 arranged on the side of the second main housing 12, a notch is provided on the circumference of the bearing mounting ring 121. A first oil retaining rib 122 is also provided on the inner wall of the second main housing 12. The setting position of the first oil retaining rib 122 is consistent with the setting position of the notch.

[0059] In order to reduce axial impact, a first buffer pad is also arranged between the outer wall of the outer ring of the two main bearings and the corresponding housing. The first buffer pad includes an internal rubber part and an external metal skin. The rubber part is a multi-layer stacked structure, and the stacking direction is the axial direction of the first output shaft. It can reduce noise, vibration and acoustic roughness (Noise, Vibration, Harshness, referred to as NVH) and improve vehicle performance.

[0060] Furthermore, a second buffer pad is provided between the outer wall of the ring gear 34 and the main shell 10. The second buffer pads are provided at least in pairs on the positioning diameter of the ring gear 34 to adjust the radial floating amount of the ring gear. The structure of the second buffer pad may be the same as that of the first buffer pad. The main difference lies in the different matching requirements with the counterpart.

[0061] The transmission device provided by the present invention constructs an external oil guide chamber in the external gap of the main bearing between the main housing and the differential housing. The external oil guide chamber is connected to the external oil pump module through the first oil guide channel on the one hand, and is connected to the inner side of the main bearing through the first oil guide hole on the other hand, and the derived lubricating oil is sent to the planetary shaft through the oil guide ring, and the lubricating oil is diffused out through the planetary shaft and the needle bearing. When the rotation speed of each gear in the planetary reducer module and the differential module is low, the diffusion circulation efficiency of the lubricating oil can be guaranteed through the active oil guidance of the external oil guide chamber and the external oil pump module, and the lubrication effect of the planetary reducer module and the differential module can be guaranteed, thereby providing convenience for the application of compact coaxially arranged planetary reducer modules and differential modules.

[0062] Among them, the size of the outer oil guide chamber is relatively small, and the overall impact on the size of the main shell is relatively small, which can ensure the size reduction effect of the coaxial design. It can actually be designed according to specific needs, and this application does not make any specific restrictions on its specific size.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", 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 present invention. 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above-mentioned embodiments only express several specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A transmission device, characterized in that: include: The differential module and the planetary reducer module are arranged in the main housing, and the first output shaft and the second output shaft are coaxially arranged and used to connect the wheels, wherein: The differential module includes a differential housing and a differential gear set, wherein the differential housing is rotatably connected to the first output shaft and the second output shaft, a first shaft body perpendicular to the first output shaft is fixedly arranged in the differential housing, a first gear in the differential gear set is rotatably arranged on the first shaft body, a second gear in the differential gear set is coaxially fixedly connected to the first output shaft and the second output shaft respectively, and the first gear is meshingly connected to the second gear; The planetary reducer module comprises a sun gear coaxially fixedly connected to the input shaft, and a first planet gear and a second planet gear coaxially fixedly formed as a double gear structure, the first planet gear is meshedly connected to the sun gear, the second planet gear is meshedly connected to the gear ring arranged on the inner wall of the main housing, the input shaft is rotatably sleeved on the first output shaft, and the diameter of the first planet gear is greater than the diameter of the second planet gear; The first planetary gear and the second planetary gear are also rotatably disposed on the differential housing, and the second planetary gear and the first gear are also alternately arranged around the circumference of the first output shaft, so that the differential gear set is embedded in the space between the second planetary gear and the first output shaft, thereby reducing the axial dimensions of the differential module and the planetary reducer module; The double gear structure is also sleeved on the planetary shaft through a needle bearing, the planetary shaft is fixedly connected to the differential housing, a first oil passage is arranged inside the planetary shaft, an oil outlet hole connected to the first oil passage is arranged on the side wall, and an oil inlet hole connected to the first oil passage is arranged at the end, so as to connect the lubricating oil inside the main housing through the oil inlet hole and guide the lubricating oil to the inner area of ​​the needle bearing; The differential housing is also provided with an oil guide ring, which includes an oil baffle structure and a second oil guide hole, so as to collect lubricating oil inside the main housing through the oil baffle structure and guide the collected lubricating oil into the first oil channel through the second oil guide hole; The main housing is also provided with a first oil guide hole connected to the active oil guide path, and the first oil guide hole points to the oil retaining structure of the oil guide ring; Wherein, the active oil guide path also includes a first oil guide channel and an outer oil guide cavity; A portion of the inner side wall of the main housing is protruded outward to form a first oil pool, and an input end of the first oil guide passage is connected to the first oil pool through an external oil pump module; The differential housing is rotatably connected to the main housing via two main bearings, the outer oil guide chamber is arranged between the outer side of the main bearing and the main housing, and the output end of the first oil guide passage is connected to the outer oil guide chamber; The first oil guide hole is around the outer side of the outer ring of the main bearing and extends from the outer oil guide cavity to the inner side of the main bearing. A first oil pipe is arranged in the first oil guide hole, and the first oil pipe extends to the oil retaining structure of the oil guide ring.

2. The transmission device according to claim 1, characterized in that: The oil baffle structure includes a side wall of the oil guide ring and a baffle plate matched with the end surface of the differential case, the baffle plate is arranged around the inner side of the side wall of the oil guide ring, and the side wall portion of the oil guide ring also protrudes outward to form an oil collecting groove, the setting position and number of the oil collecting grooves correspond one-to-one to the setting position and number of the planetary shafts, and the second oil guide hole is connected to the oil collecting groove.

3. The transmission device according to claim 1, characterized in that: An inner oil guide cavity is also provided between the inner side of the main bearing and the differential housing, and the output end of the first oil guide passage is also connected to the inner oil guide cavity.

4. The transmission device according to claim 1, characterized in that: The oil outlet hole of the first oil channel is arranged at the middle position of the needle roller bearing and is aligned with the needle roller sleeve of the needle roller bearing.

5. The transmission device according to claim 1, characterized in that: A step structure is provided on one end face of the planetary shaft, and a limiting gasket is also provided on the lower step face of the step structure. The limiting gasket is clamped and fixed between the planetary shaft and the counterpart, so as to limit the rotation of the planetary shaft relative to the differential housing through the step structure and the limiting gasket.

6. The transmission device according to claim 1, characterized in that: The differential housing is rotatably connected to the main housing via two main bearings. An inwardly protruding bearing mounting ring is provided at one end of the main housing. One of the main bearings is sleeved and fixed outside the bearing mounting ring. A notch is also provided on the circumference of the bearing mounting ring for lubricating the shaft provided on the inner ring of the bearing mounting ring. A first oil retaining rib is also provided on the inner wall of the main housing. The setting position of the first oil retaining rib is consistent with the setting position of the notch.

7. The transmission device according to claim 1, characterized in that: The differential housing is rotatably connected to the main housing via two main bearings, and a first buffer pad is provided between the outer walls of the two main bearings and the corresponding housings, the first buffer pad comprises an internal rubber portion and an external metal covering, the rubber portion is a multi-layer stacked structure, and the stacking direction is the axial direction of the first output shaft.

8. The transmission device according to claim 1, characterized in that: A second buffer pad is further arranged between the outer wall of the gear ring and the main housing, and the second buffer pads are arranged at least in pairs on the positioning diameter of the gear ring.

9. The transmission device according to claim 1, characterized in that: The differential housing includes a first differential housing and a second differential housing, the planetary reducer module is mounted on the first differential housing, the second differential housing is embedded in the first differential housing, and a semicircular groove structure with matching positioning is provided on the docking surface of the first differential housing and the second differential housing to form a first shaft hole for installing the first shaft body after the semicircular groove structures are docked, wherein the planetary reducer module is a three-planet structure, and the three first shaft bodies are fixed in a Y-shaped structure.

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