Drivetrain

Abstract

This invention provides a transmission system comprising a housing assembly, a cover plate assembly, a sun gear assembly, and a planetary carrier assembly. The housing assembly includes a housing and a first bearing and a ring gear disposed within the housing. The cover plate assembly includes a cover plate and a second bearing disposed within the cover plate. The sun gear assembly includes a sun gear and a third bearing mounted on the sun gear. The planetary carrier assembly includes a planetary carrier and planetary components. The cover plate is connected to the housing, and the planetary carrier passes through the first and second bearings. The third bearing is located within the planetary carrier. The planetary components mesh with the sun gear and the ring gear. An oil reservoir is located at the bottom of the area between the housing and the cover plate. The housing assembly has a first oil passage, the planetary carrier assembly has a second oil passage, and the cover plate assembly and the sun gear assembly have a third oil passage. The first, second, and third oil passages all extend from the upper part of the housing assembly to the oil reservoir. This technical solution reduces the overall size of the transmission system while ensuring effective lubrication.

Description

Technical Field

[0001] This invention relates to the field of transmission system technology, and more specifically, to a transmission system. Background Technology

[0002] With the rapid development of the pure electric commercial vehicle industry and its large-scale market promotion, the industry's performance requirements for pure electric commercial vehicles are becoming increasingly stringent. However, the driving range, cost, and safety of pure electric commercial vehicles are largely constrained by power batteries and other key technologies. Therefore, before the power battery issue is resolved, research on the transmission system can effectively improve the overall vehicle's driving range and power performance. Small, high-speed, and efficient transmission systems are currently the main development direction and are one of the key components of pure electric commercial vehicles; their research and development are beneficial to improving the power performance of pure electric vehicles.

[0003] Currently, in order to effectively lubricate and dissipate heat, the transmission system of existing pure electric vehicles needs to be made larger or additional lubrication pumps are added for lubrication and oil circulation. This results in the transmission system occupying more space and being heavier, increasing the failure points, reducing the overall efficiency of the reducer, reducing the vehicle's driving range, and increasing the overall vehicle cost. Summary of the Invention

[0004] This invention provides a transmission system to solve the problem of large size in existing transmission systems.

[0005] To address the aforementioned problems, the present invention provides a transmission system comprising a housing assembly, a cover plate assembly, a sun gear assembly, and a planetary carrier assembly. The housing assembly includes a housing and a first bearing and a ring gear disposed within the housing. The cover plate assembly includes a cover plate and a second bearing disposed within the cover plate. The sun gear assembly includes a sun gear and a third bearing mounted on the sun gear. The planetary carrier assembly includes a planetary carrier and planetary assemblies. The cover plate and the housing are connected. The planetary carrier passes through the first and second bearings. The third bearing is located within the planetary carrier. The planetary assemblies mesh with the sun gear and the ring gear. An oil reservoir is located at the bottom of the area between the housing and the cover plate. The housing assembly has a first oil passage extending from above the first bearing to the oil reservoir. The planetary carrier assembly has a second oil passage extending from the planetary assemblies to the oil reservoir. The cover plate assembly and the sun gear assembly have a third oil passage extending from the upper part of the second bearing and the upper part of the sun gear assembly to the oil reservoir.

[0006] Furthermore, the housing includes an outer shell and a support ring disposed within the outer shell. The housing assembly also includes a first sealing structure connected to the outer shell. A first bearing is disposed within the support ring, and a planetary carrier passes through the first sealing structure. The upper sidewall of the support ring has a radially penetrating housing radial oil passage located between the end face of the first bearing and the outer shell. The area between the first sealing structure, the outer shell, the planetary carrier, and the first bearing forms a first annular oil passage. The lower part of the first bearing has an axially penetrating housing axial oil passage. The first oil passage includes a housing radial oil passage, a first annular oil passage, and a housing axial oil passage.

[0007] Furthermore, the planetary assembly includes a planetary support shaft, planetary bearings, planetary gears, and two friction baffles. The planetary support shaft is mounted on a planetary carrier, and the planetary bearings and two friction baffles are all fitted onto the planetary support shaft. The planetary gears are fitted onto the planetary bearings, and the two friction baffles respectively engage with the two sides of the planetary gears. The planetary gears mesh with the sun gear and the ring gear. The planetary support shaft has a first central oil passage that extends axially and multiple radially extending planetary oil passages that extend radially through the sidewall of the planetary support shaft. The second oil passage includes the gap between one side of the friction baffle and the planetary carrier, the gap between the other side of the friction baffle and the planetary gears, the gap inside the planetary bearings, the gap between the planetary bearings and the planetary carrier, the gap between the planetary bearings and the planetary support shaft, the first central oil passage, and the multiple radially extending planetary oil passages.

[0008] Furthermore, one end of the first central oil passage faces the first bearing, and the other end of the first central oil passage faces the second bearing.

[0009] Furthermore, the planetary carrier assembly includes at least two planetary assemblies, each of which has a second oil passage.

[0010] Furthermore, the cover plate assembly also includes a second sealing structure, which is connected to the cover plate. The sun gear passes through the second sealing structure. A second annular oil passage is provided between the third bearing, the sun gear, the planet carrier, and the second sealing structure. The third oil passage includes the clearance within the second bearing, the clearance between the second bearing and the planet carrier, the clearance between the planetary assembly and the sun gear, the clearance between the sun gear and the planet carrier, the clearance within the third bearing, and the second annular oil passage.

[0011] Furthermore, the sun gear has a second central oil passage that runs through the axis and multiple sun radial oil passages that run through the sidewall of the sun gear. The third oil passage also includes the second central oil passage and multiple sun radial oil passages.

[0012] Furthermore, the transmission system also includes a first oil baffle and a second oil baffle vertically disposed in the oil reservoir. The first oil baffle is located between one side of the gear ring and the housing, and the area between one side of the first oil baffle and the housing forms the first oil reservoir. The area between the other side of the first oil baffle and the gear ring forms the first lubrication cavity. The second oil baffle is located between the other side of the gear ring and the cover plate. The area between one side of the second oil baffle and the cover plate forms the second oil reservoir. The area between the other side of the second oil baffle and the gear ring forms the second lubrication cavity.

[0013] Furthermore, the housing is an integral structure, and the housing has a first inner hole, a second inner hole, a third inner hole, a fourth inner hole and a fifth inner hole arranged in sequence. The first inner hole, the second inner hole, the third inner hole, the fourth inner hole and the fifth inner hole are coaxially arranged and their inner diameters decrease sequentially. The housing assembly also includes a first sealing structure and a bearing baffle. The cover plate is located in the first inner hole, the gear ring is located in the second inner hole, a part of the bearing baffle is located in the third inner hole, the first bearing is located in the fourth inner hole, the end face of the bearing baffle and the first bearing are in a stop fit, and a part of the first sealing structure is located in the fifth inner hole.

[0014] Furthermore, the transmission system also includes a vent and a gas-liquid separator. The upper part of the housing has a vent hole, the vent is connected to the vent hole, the gas-liquid separator is connected to the inner wall of the housing, and the gas-liquid separator is located below the vent hole.

[0015] The present invention provides a transmission system comprising a housing assembly, a cover plate assembly, a sun gear assembly, and a planetary carrier assembly. The housing assembly includes a housing and a first bearing and a ring gear disposed within the housing. The cover plate assembly includes a cover plate and a second bearing disposed within the cover plate. The sun gear assembly includes a sun gear and a third bearing mounted on the sun gear. The planetary carrier assembly includes a planetary carrier and planetary components. The cover plate and housing are connected. The planetary carrier passes through the first and second bearings. The third bearing is located within the planetary carrier. The planetary components mesh with the sun gear and the ring gear. An oil reservoir is located at the bottom of the area between the housing and the cover plate. The housing assembly has a first oil passage extending from above the first bearing to the oil reservoir. The planetary carrier assembly has a second oil passage extending from the planetary components to the oil reservoir. The cover plate assembly and the sun gear assembly have a third oil passage extending from the upper part of the second bearing and the upper part of the sun gear assembly to the oil reservoir. This design divides the transmission system into at least four module components: housing assembly, cover plate assembly, sun gear assembly, and planetary carrier assembly. Each module can be individually machined and assembled, and then multiple modules are assembled to form the transmission system. This configuration reduces the assembly difficulty and processing cost of the transmission system. Furthermore, in case of problems with the transmission system, the faulty module can be disassembled and repaired, improving maintenance efficiency and extending the service life and maintenance cycle of the transmission system. Moreover, by setting up a first, second, and third oil circuit, effective lubrication of different components within the transmission system can be achieved. This avoids the need for an additional lubrication pump in existing technologies to ensure lubrication and heat dissipation for all components, which leads to a larger overall size of the transmission system. This design ensures lubrication effectiveness while reducing the overall size of the transmission system, further extending its service life and maintenance cycle. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the transmission system provided in an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 A schematic diagram of the sun gear assembly in the transmission system;

[0019] Figure 3 It shows Figure 1 A schematic diagram of the planetary assembly in the transmission system;

[0020] Figure 4 It shows Figure 1A schematic diagram of the structure of the housing assembly and cover plate assembly in the transmission system;

[0021] Figure 5 It shows Figure 4 A schematic diagram of the structure of the housing assembly;

[0022] Figure 6 It shows Figure 1 A schematic diagram of the oil circuit of the transmission system;

[0023] Figure 7 It shows Figure 1 A schematic diagram of the housing and the first oil baffle in the transmission system;

[0024] Figure 8 It shows Figure 1 A schematic diagram of the structure of the cover plate and the second oil baffle in the transmission system.

[0025] The above figures include the following reference numerals:

[0026] 10. Housing assembly; 11. Housing; 111. Outer shell; 112. Support ring; 113. First inner hole; 114. Second inner hole; 115. Third inner hole; 116. Fourth inner hole; 117. Fifth inner hole; 118. Vent hole; 12. First bearing; 13. Gear ring; 14. First oil passage; 141. Housing radial oil passage; 142. First annular oil passage; 143. Housing axial oil passage; 15. First sealing structure; 16. Bearing baffle; 20. Cover plate assembly; 21. Cover plate; 22. Second bearing; 23. Second oil passage; 231. First central oil passage; 232. Planetary radial oil passage; 24. 30. Second sealing structure; 31. Sun gear assembly; 32. Sun gear; 33. Third bearing; 34. Third oil passage; 35. Second annular oil passage; 36. Second central oil passage; 37. Sun radial oil passage; 40. Planetary carrier assembly; 41. Planetary carrier; 42. Planetary assembly; 421. Planetary support shaft; 422. Planetary bearing; 423. Planetary gear; 424. Friction baffle; 50. Oil reservoir; 51. First oil reservoir; 52. First lubrication chamber; 53. Second oil reservoir; 54. Second lubrication chamber; 61. First oil baffle; 62. Second oil baffle; 70. Vent; 80. Gas-liquid separator. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 8 As shown, an embodiment of the present invention provides a transmission system, which includes a housing assembly 10, a cover plate assembly 20, a sun gear assembly 30, and a planetary carrier assembly 40. The housing assembly 10 includes a housing 11 and a first bearing 12 and a gear ring 13 disposed within the housing 11. The cover plate assembly 20 includes a cover plate 21 and a second bearing 22 disposed within the cover plate 21. The sun gear assembly 30 includes a sun gear 31 and a third bearing 32 sleeved on the sun gear 31. The planetary carrier assembly 40 includes a planetary carrier 41 and planetary assemblies 42. The cover plate 21 is connected to the housing 11, and the planetary carrier 41 passes through the first bearing 12 and the second bearing 42. 22. The third bearing 32 is located inside the planetary carrier 41, and the planetary assembly 42, the sun gear 31, and the ring gear 13 are all meshed. The bottom of the area between the housing 11 and the cover plate 21 has an oil reservoir 50. The housing assembly 10 has a first oil passage 14, which extends from above the first bearing 12 to the oil reservoir 50. The planetary carrier assembly 40 has a second oil passage 23, which extends from the planetary assembly 42 to the oil reservoir 50. The cover plate assembly 20 and the sun gear assembly 30 have a third oil passage 33, which extends from the upper part of the second bearing 22 and the upper part of the sun gear assembly 30 to the oil reservoir 50.

[0029] In this embodiment, the transmission system is divided into at least four component modules: housing assembly 10, cover plate assembly 20, sun gear assembly 30, and planetary carrier assembly 40. Each component module can be individually processed and assembled, and then multiple component modules are assembled to form the transmission system. This arrangement reduces the assembly difficulty and processing cost of the transmission system. Furthermore, when problems occur in the transmission system, the faulty component module can be disassembled and repaired, improving maintenance efficiency and extending the service life and maintenance cycle of the transmission system. Further, by setting the first oil passage 14, the second oil passage 23, and the third oil passage 33, effective lubrication of different components inside the transmission system can be achieved. This avoids the need for an additional lubrication pump in the prior art to ensure lubrication and heat dissipation of the components within the transmission system, which leads to a larger overall size of the transmission system. This ensures lubrication effect while reducing the overall size of the transmission system, further extending its service life and maintenance cycle.

[0030] Specifically, the housing 11 includes an outer shell 111 and a support ring 112 disposed within the outer shell 111. The housing assembly 10 also includes a first sealing structure 15, which is connected to the outer shell 111. A first bearing 12 is disposed within the support ring 112, and a planetary carrier 41 passes through the first sealing structure 15. The upper sidewall of the support ring 112 has a radially penetrating housing radial oil passage 141, which is located between the end face of the first bearing 12 and the outer shell 111. The area between the first sealing structure 15, the outer shell 111, the planetary carrier 41, and the first bearing 12 forms a first annular oil passage 142. The lower part of the first bearing 12 has an axially penetrating housing axial oil passage 143. The first oil passage 14 includes the housing radial oil passage 141, the first annular oil passage 142, and the housing axial oil passage 143.

[0031] In this embodiment, as Figure 6 As shown, lubricating oil flows down from above the support ring 112 and lubricates the outer circumferential surface of the support ring 112. Then, the lubricating oil flows axially to both sides of the support ring 112. Specifically, the lubricating oil flowing towards the first sealing structure 15 enters the radial oil passage 141 of the housing and continues to flow along it. A portion of the lubricating oil flowing out of the radial oil passage 141 flows towards the first bearing 12 and enters the first annular oil passage 142 to lubricate the first bearing 12. This portion of lubricating oil then flows to the side of the first bearing 12 away from the first sealing structure 15 and lubricates a portion of the planetary carrier 41, finally flowing into the oil reservoir 50. The remaining portion of lubricating oil flowing out of the radial oil passage 141 flows towards the first sealing structure 15. Structure 15, the first sealing structure 15 seals the housing 11 to prevent lubricating oil from flowing out, so that a portion of the lubricating oil in the cavity of the housing of the first bearing 12 and the first sealing structure 15 lubricates the inner surface of the housing 11 and the planetary carrier 41. Then, the lubricating oil merges with another portion of lubricating oil through the axial oil passage 143 of the housing and finally flows into the oil storage cavity 50. Furthermore, the lubricating oil flowing towards the first bearing 12 will flow directly down to the planetary carrier 41 and lubricate the outer peripheral surface of the planetary carrier 41, and finally flow into the oil storage cavity 50. This arrangement ensures lubrication effect while lubricating multiple components in the transmission system, improving the reliability of the transmission system lubrication.

[0032] like Figure 1 and Figure 3As shown, the planetary assembly 42 includes a planetary support shaft 421, a planetary bearing 422, a planetary gear 423, and two friction baffles 424. The planetary support shaft 421 is mounted on the planet carrier 41. The planetary bearing 422 and the two friction baffles 424 are all sleeved on the planetary support shaft 421. The planetary gear 423 is sleeved on the planetary bearing 422. The two friction baffles 424 respectively engage with the two sides of the planetary gear 423. The planetary gear 423 meshes with the sun gear 31 and the ring gear 13. The planetary support shaft 421 has an axial through-type... The first central oil passage 231 and a plurality of planetary radial oil passages 232 are radially arranged on the side wall of the planetary support shaft 421. The second oil passage 23 includes the gap between one side of the friction baffle 424 and the planet carrier 41, the gap between the other side of the friction baffle 424 and the planetary gear 423, the gap inside the planetary bearing 422, the gap between the planetary bearing 422 and the planet carrier 41, the gap between the planetary bearing 422 and the planetary support shaft 421, the first central oil passage 231 and the plurality of planetary radial oil passages 232.

[0033] In this embodiment, as Figure 6 As shown, lubricating oil flows down from above the planetary gear 423 and lubricates the outer circumferential surface of the planetary gear 423. Then, the lubricating oil moves to both sides along the axial direction of the planetary bearing 422, with symmetrical lubrication positions on both sides. Specifically, the lubricating oil flows to the gaps between the friction baffle 424 and the planetary gear 423, and between the friction baffle 424 and the planetary carrier 41, flowing along these gaps to lubricate the spaces on both sides of the friction baffle 424. Next, the two lubricating oil flows merge into one and flows towards the center along the axial direction of the planetary bearing 422. Afterward, the lubricating oil enters multiple radial oil passages 232 on one side of the planetary bearing 422 and flows into the first central oil passage 231. The lubricating oil in the first central oil passage 231 flows in three directions. One direction flows towards the first bearing 12, and the lubricating oil in this direction flows out from one end of the first central oil passage 231 and onto the planetary carrier 41, lubricating part of the outer circumferential surface of the planetary carrier 41, and finally flows into the oil reservoir 50. The second stream flows towards the third bearing 32 and splits, with a portion flowing to the outer circumferential surface of the planetary carrier 41 and lubricating part of its outer circumferential surface before finally flowing into the oil reservoir 50. The other portion flows to the third bearing 32 and lubricates it before finally flowing into the oil reservoir 50. The third stream of lubricating oil flows into the multiple radial oil passages 232 on the other side and lubricates the areas on both sides of the friction baffle 424 on the other side before finally flowing into the oil reservoir 50. This arrangement ensures the reliability of lubricating oil supply to the planetary carrier assembly 40.

[0034] Specifically, one end of the first central oil passage 231 faces the first bearing 12, and the other end faces the second bearing 22. This arrangement allows the lubricating oil flowing into the first central oil passage 231 to flow towards the first bearing 12 and the second bearing 22, facilitating lubrication of the components on both sides of the first central oil passage 231 and improving the lubrication effect.

[0035] Furthermore, the planetary carrier assembly 40 includes at least two planetary assemblies 42, each of which has a second oil passage 23. This arrangement improves the transmission performance between the planetary carrier assembly 40, the sun gear assembly 30, and the ring gear 13, while also increasing the structural strength of the transmission structure formed by the three components and enhancing the reliability of their transmission connection. Simultaneously, the presence of a second oil passage 23 on each planetary assembly 42, with at least two second oil passages 23 distributed circumferentially along the ring gear 13, further improves the lubrication of the planetary carrier assembly 40 (especially the planetary bearing 422), the cover plate assembly 20 (especially the second bearing 22), and the housing assembly 10 (especially the first bearing 12).

[0036] like Figure 1 As shown, the cover plate assembly 20 also includes a second sealing structure 24, which is connected to the cover plate 21. The sun gear 31 passes through the second sealing structure 24. A second annular oil passage 331 is provided between the third bearing 32, the sun gear 31, the planet carrier 41, and the second sealing structure 24. The third oil passage 33 includes the gap in the second bearing 22, the gap between the second bearing 22 and the planet carrier 41, the gap between the planet assembly 42 and the sun gear 31, the gap between the sun gear 31 and the planet carrier 41, the gap in the third bearing 32, and the second annular oil passage 331.

[0037] In this embodiment, as Figure 6As shown, the lubricating oil flowing out of the second oil passage 23 enters the third oil passage 33 and provides lubricating oil to the third oil passage 33. Specifically, the lubricating oil flowing through the multiple planetary radial oil passages 232 on both sides flows into the gap between the planetary assembly 42 and the sun gear 31 and splits along the axial direction of the sun gear 31. One path of lubricating oil flows towards the first bearing 12 to the gap between the planetary assembly 42 and the sun gear 31 and lubricates the sun gear 31 and the planetary assembly 42. Finally, it flows into the second oil passage 23 on the other side and into the oil reservoir 50. The lubricating oil in the second path flows towards the second bearing 22 and splits. Further, one of the second paths flows through the gap between the second bearing 22 and the planetary carrier 41 and lubricates it. Then, this path of lubricating oil enters the second annular oil passage 331 to lubricate the area within the second annular oil passage 331 and finally flows into the oil reservoir 50. Another path of lubricant passes directly through the second bearing 22 to lubricate it. This lubricant then enters the second annular oil passage 331 to lubricate the area within it, and finally flows into the oil reservoir 50. A third path of lubricant flows through and lubricates the third bearing 32 before flowing into the oil reservoir 50. This arrangement ensures the reliability of lubrication for the planetary carrier assembly 40 and the sun gear assembly 30.

[0038] Specifically, the sun gear 31 has an axially penetrating second central oil passage 332 and multiple radially penetrating sun radial oil passages 333 on the side wall of the sun gear 31. The third oil passage 33 also includes the second central oil passage 332 and multiple radially penetrating sun radial oil passages 333. This arrangement allows some of the lubricating oil passing through the second bearing 22 (or the second annular oil passage 331 on one side) to flow into the second central oil passage 332 through the multiple radially penetrating sun radial oil passages 333 on one side, lubricating and diverting the area within the second central oil passage 332. One path enters the gap between the sun gear 31 and the planet carrier 41 for lubrication and finally enters the oil reservoir 50, while the other path flows into the second annular oil passage 331 on the other side through the multiple radially penetrating sun radial oil passages 333 on the other side for lubrication and finally enters the oil reservoir 50, ensuring comprehensive lubrication coverage and reliability.

[0039] Furthermore, the transmission system also includes a first oil baffle 61 and a second oil baffle 62 vertically disposed within the oil reservoir 50. The first oil baffle 61 is located between one side of the gear ring 13 and the housing 11, forming the first oil reservoir 51. The area between the other side of the first oil baffle 61 and the housing 11 forms the first lubrication cavity 52. ​​The second oil baffle 62 is located between the other side of the gear ring 13 and the cover plate 21, forming the second oil reservoir 53. The area between the other side of the second oil baffle 62 and the gear ring 13 forms the second lubrication cavity 54. This arrangement divides the oil reservoir 50 into four cavities: the first oil reservoir 51, the first lubrication cavity 52, the second oil reservoir 53, and the second lubrication cavity 54, effectively restricting the flow of lubricating oil.

[0040] like Figure 5 As shown, the housing 11 is an integral structure. The housing 11 has a first inner hole 113, a second inner hole 114, a third inner hole 115, a fourth inner hole 116, and a fifth inner hole 117 arranged sequentially. The first inner hole 113, the second inner hole 114, the third inner hole 115, the fourth inner hole 116, and the fifth inner hole 117 are coaxially arranged and their inner diameters decrease sequentially. The housing assembly 10 also includes a first sealing structure 15 and a bearing baffle 16. The cover plate 21 is located in the first inner hole 113, the gear ring 13 is located in the second inner hole 114, a part of the bearing baffle 16 is located in the third inner hole 115, the first bearing 12 is located in the fourth inner hole 116, and the end faces of the bearing baffle 16 and the first bearing 12 are in a stop-fitting relationship. A part of the first sealing structure 15 is located in the fifth inner hole 117. This design, with the interior of the housing 11 featuring a stepped structure, allows for the machining of all internal holes to be completed in one go through a single positioning and clamping process. This ensures consistent machining datum for the housing 11, guarantees the coaxiality of multiple internal holes within the housing 11, improves machining accuracy, reduces machining cycle and difficulty, and consequently lowers machining costs.

[0041] Optionally, the stepped internal structure of the shell 11 can be produced by casting, which is beneficial for rapid casting and demolding.

[0042] like Figure 1 As shown, the transmission system also includes a breather 70 and a gas-liquid separator 80. The upper part of the housing 11 has a vent 118, and the breather 70 is connected to the vent 118. The gas-liquid separator 80 is connected to the inner wall of the housing 11 and is located below the vent 118. This arrangement further restricts the flow of lubricating oil by including the breather 70 and the gas-liquid separator 80, ensuring the reliability of lubricating oil flow.

[0043] Optionally, such as Figure 7As shown, the first oil baffle 61 is connected to the bottom of the housing 11 by fasteners. Furthermore, the inner wall of the housing 11 has multiple first reinforcing ribs, and the first oil baffle 61 has multiple first notches, each notch avoiding a first reinforcing rib. Additionally, there is a gap between the lower edge of the first oil baffle 61 and the inner wall of the housing 11, allowing lubricating oil on both sides of the first oil baffle 61 to communicate through the gap.

[0044] Optionally, such as Figure 8 As shown, the second oil baffle 62 is connected to the bottom of the cover plate 21 by fasteners. Furthermore, the inner wall of the cover plate 21 has multiple second reinforcing ribs. Also, there is a gap between the lower edge of the second oil baffle 62 and the inner wall of the cover plate 21, allowing lubricating oil on both sides of the second oil baffle 62 to communicate through the gap.

[0045] The transmission system in this solution can be applied to pure electric commercial vehicles or other vehicles and equipment. This solution significantly reduces assembly difficulty by dividing the transmission system into several component modules, which are then assembled individually and combined into a complete transmission system. The internal structure of the housing in this solution has a stepped structure, gradually decreasing in size. This not only facilitates casting demolding but also allows for machining. During machining, the entire internal structure can be machined in a single positioning and clamping operation, ensuring consistent machining datum for the housing. This greatly improves machining accuracy, reduces machining cycle and difficulty, and lowers production costs. This solution cleverly arranges multiple lubrication oil circuits, improving the lubrication effect of the transmission system without adding a lubrication oil pump or enlarging the lubrication oil reservoir, thereby increasing the service life of the transmission system and extending maintenance intervals. This solution restricts the arbitrary flow of lubricating oil by arranging multiple oil baffles and divides the bottom of the housing into an oil reservoir for storing lubricating oil and a lubrication chamber for lubricating the transmission components.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A transmission system, characterized in that, The transmission system includes a housing assembly, a cover plate assembly, a sun gear assembly, and a planetary carrier assembly. The housing assembly includes a housing and a first bearing and a ring gear disposed within the housing. The cover plate assembly includes a cover plate and a second bearing disposed within the cover plate. The sun gear assembly includes a sun gear and a third bearing sleeved on the sun gear. The planetary carrier assembly includes a planetary carrier and planetary assemblies. The cover plate is connected to the housing. The planetary carrier passes through the first and second bearings. The third bearing is located within the planetary carrier. The planetary assemblies mesh with the sun gear and the ring gear. The area between the housing and the cover plate has an oil reservoir at the bottom. The housing assembly has a first oil passage that extends from above the first bearing to the oil reservoir. The planetary carrier assembly has a second oil passage that extends from the planetary assembly to the oil reservoir. The cover plate assembly and the sun gear assembly have a third oil passage that extends from the upper part of the second bearing and the upper part of the sun gear assembly to the oil reservoir. The planetary assembly includes a planetary support shaft, planetary bearings, planetary gears, and two friction baffles. The planetary support shaft is mounted on a planetary carrier. The planetary bearings and the two friction baffles are all fitted onto the planetary support shaft. The planetary gears are fitted onto the planetary bearings. The two friction baffles respectively mate with the two sides of the planetary gears. The planetary gears mesh with the sun gear and the ring gear. The planetary support shaft has a first central oil passage that extends axially and multiple radial oil passages that extend radially through the sidewalls of the planetary support shaft. The second oil passage includes the gap between one side of the friction baffle and the planetary carrier, the gap between the other side of the friction baffle and the planetary gears, the gap inside the planetary bearings, the gap between the planetary bearings and the planetary carrier, the gap between the planetary bearings and the planetary support shaft, the first central oil passage, and the multiple radial oil passages. The housing includes an outer shell and a support ring disposed within the outer shell. The housing assembly also includes a first sealing structure connected to the outer shell. A first bearing is disposed within the support ring, and a planetary carrier passes through the first sealing structure. The upper sidewall of the support ring has a radially penetrating housing radial oil passage located between the end face of the first bearing and the outer shell. The area between the first sealing structure, the outer shell, the planetary carrier, and the first bearing forms a first annular oil passage. The lower part of the first bearing has an axially penetrating housing axial oil passage. The first oil passage includes a housing radial oil passage, a first annular oil passage, and a housing axial oil passage. The cover plate assembly also includes a second sealing structure, which is connected to the cover plate. The sun gear passes through the second sealing structure. A second annular oil passage is provided between the third bearing, the sun gear, the planet carrier, and the second sealing structure. The third oil passage includes the clearance within the second bearing, the clearance between the second bearing and the planet carrier, the clearance between the planet assembly and the sun gear, the clearance between the sun gear and the planet carrier, the clearance within the third bearing, and the second annular oil passage. The sun gear has an axially penetrating second central oil passage and multiple sun radial oil passages radially penetrating the sidewalls of the sun gear. The third oil passage also includes the second central oil passage and multiple sun radial oil passages.

2. The transmission system according to claim 1, characterized in that, One end of the first central oil passage faces the first bearing, and the other end of the first central oil passage faces the second bearing.

3. The transmission system according to claim 1, characterized in that, The planetary carrier assembly includes at least two planetary components, each of which has a second oil passage.

4. The transmission system according to claim 1, characterized in that, The transmission system also includes a first oil baffle and a second oil baffle vertically disposed in the oil reservoir. The first oil baffle is located between one side of the gear ring and the housing. The area between one side of the first oil baffle and the housing forms the first oil reservoir, and the area between the other side of the first oil baffle and the gear ring forms the first lubrication cavity. The second oil baffle is located between the other side of the gear ring and the cover plate. The area between one side of the second oil baffle and the cover plate forms the second oil reservoir, and the area between the other side of the second oil baffle and the gear ring forms the second lubrication cavity.

5. The transmission system according to claim 1, characterized in that, The housing is a single-piece structure, and has a first inner hole, a second inner hole, a third inner hole, a fourth inner hole, and a fifth inner hole arranged in sequence. The first inner hole, the second inner hole, the third inner hole, the fourth inner hole, and the fifth inner hole are coaxially arranged and their inner diameters decrease sequentially. The housing assembly also includes a first sealing structure and a bearing baffle. The cover plate is located in the first inner hole, the gear ring is located in the second inner hole, a part of the bearing baffle is located in the third inner hole, the first bearing is located in the fourth inner hole, the end face of the bearing baffle and the first bearing are in a stop fit, and a part of the first sealing structure is located in the fifth inner hole.

6. The transmission system according to claim 1, characterized in that, The transmission system also includes a vent and a gas-liquid separator. The upper part of the housing has a vent hole, the vent is connected to the vent hole, the gas-liquid separator is connected to the inner wall of the housing, and the gas-liquid separator is located below the vent hole.

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