Oil cooling system

Abstract

The invention discloses an oil cooling system which comprises a driving system shell, an oil pump and an oil cooler. The engine oil cooling device further comprises an engine oil cooling unit, the engine oil cooling unit comprises an oil storage groove, an oil retainer and an engine shaft, the oil storage groove is formed in the bottom of an engine bearing groove of the gear cavity, and the engine shaft is installed in the gear cavity and aligned with the central axis of the engine bearing groove. The oil storage groove is communicated with the generator cavity, the oil retainer is arranged between the oil storage groove and the engine shaft, a first oil hole is formed in the oil retainer, oil enters a first shaft cavity in the engine shaft from the oil storage groove through the first oil hole, a plurality of cooling oil holes are formed in the first shaft cavity, and the oil storage groove is communicated with the generator cavity. And the central axis of the first oil hole is aligned with the central axis of the first shaft cavity. The hydraulic pressure entering the cooling oil hole is increased through the oil retainer, so that oil can quickly enter the cooling oil hole, and the cooling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of vehicle drive system assemblies, and more particularly to an oil cooling system for drive system assemblies. Background Technology

[0002] Oil cooling systems in automotive drive systems are primarily used in transmissions, differentials, and some electric vehicle reducers integrated with motors. Their core function is to lubricate, cool, and clean high-speed rotating components such as gears, bearings, clutches, and motors through circulating lubricating oil (or specialized cooling oil).

[0003] While existing oil cooling systems can effectively solve basic heat dissipation problems, they have revealed problems such as insufficient heat dissipation efficiency and poor local heat dissipation performance when facing the demands for higher performance, greater intelligence, and higher energy efficiency.

[0004] Therefore, it is necessary to design an oil cooling system that can improve cooling efficiency and enhance local cooling performance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an oil cooling system that can improve cooling efficiency and local cooling performance.

[0006] The present invention provides an oil cooling system, including a drive system housing, an oil pump, and an oil cooler; The drive system housing includes a main housing, a front cover, and a rear cover. The main housing includes a generator cavity, a drive motor cavity, a distribution oil cavity, and a gear cavity. The generator cavity, the distribution oil cavity, and the drive motor cavity are located on the front side. The distribution oil cavity is located between the generator cavity and the drive motor cavity. The gear cavity is located on the rear side. The front cover covers the front side of the main housing, and the rear cover covers the rear side of the main housing. The oil pump pumps oil into the oil cooler, the oil cooler sends the cooled oil into the distribution oil chamber, and the distribution oil chamber sends the oil into the generator chamber and the drive motor chamber respectively. It also includes an engine oil cooling unit, which includes an oil reservoir, an oil baffle ring, and an engine shaft. The oil reservoir is located at the bottom of the engine bearing groove in the gear cavity. The engine shaft is installed in the gear cavity and aligned with the central axis of the engine bearing groove. The oil reservoir communicates with the generator cavity. The oil baffle ring is located between the oil reservoir and the engine shaft. The oil baffle ring has a first oil hole. Oil enters from the oil reservoir through the first oil hole into the first shaft cavity in the engine shaft. The first shaft cavity has multiple cooling oil holes, and the central axis of the first oil hole is aligned with the central axis of the first shaft cavity.

[0007] Furthermore, the oil baffle ring includes an oil baffle plate, an oil baffle boss, and a first oil hole. The oil baffle boss is disposed in the middle of the oil baffle plate and is inserted into the first shaft cavity. The first oil hole is disposed in the center of the oil baffle boss.

[0008] Furthermore, the oil baffle is also provided with a second oil hole, the engine bearing is installed in the engine bearing groove, the engine bearing is sleeved on the engine shaft, and the second oil hole delivers oil to the engine bearing.

[0009] Furthermore, the oil storage tank is crescent-shaped, and a first oil passage is provided at the bottom of the oil storage tank, which is connected to the generator cavity.

[0010] Furthermore, a second engine bearing and a direct drive gear are mounted on the engine shaft, and multiple cooling oil holes are respectively connected to the second engine bearing and the direct drive gear.

[0011] Furthermore, the engine oil cooling unit also includes an oil drip groove, which is disposed in the gear cavity; A generator drive gear is mounted on the engine shaft, and the generator drive gear meshes with the generator shaft pinion. The oil drip groove is located above the meshing point between the generator drive gear and the generator shaft pinion.

[0012] Furthermore, it also includes a drive motor oil cooling unit, which includes a second oil passage, an oil injection pipe and a lubrication chamber. The second oil passage is connected to the drive motor cavity. One end of the oil injection pipe is connected to the drive motor cavity and the other end is inserted into the lubrication chamber. The lubrication chamber is radially formed in the drive motor bearing groove, which is located in the gear cavity.

[0013] Furthermore, the fuel injection pipe includes a main fuel pipe and a branch fuel pipe, the main fuel pipe facing the drive motor gear, and the branch fuel pipe inserted into the drive motor bearing groove.

[0014] Furthermore, it also includes a generator oil cooling unit, which includes a third oil passage, a second shaft cavity, a bearing oil hole, and a stator oil hole; The third oil passage is provided on the front end cover, one end of the third oil passage is connected to the oil distribution chamber, and the other end is connected to the second shaft cavity; The second shaft cavity is located at the center of the generator shaft, the generator shaft is installed in the generator cavity, the bearing oil hole and the stator oil hole are opened on the generator shaft, and the second shaft cavity is connected to the generator bearing and the generator rotor.

[0015] Furthermore, the front end cover is provided with an intermediate bearing groove, and an oil inlet groove is radially formed on the lower edge of the intermediate bearing groove.

[0016] The above technical solution has the following beneficial effects: This invention increases the oil level in the first shaft cavity of the engine shaft by using an oil baffle ring, thereby increasing the hydraulic pressure entering the cooling oil hole, allowing the oil to enter the cooling oil hole quickly and improving cooling efficiency. Attached Figure Description

[0017] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A schematic diagram of the front side of the main housing in one embodiment of the present invention; Figure 2 This is a perspective view of the main housing in one embodiment of the present invention; Figure 3 This is a partially enlarged view of the generator cavity in one embodiment of the present invention; Figure 4 This is a schematic diagram of the rear side of the main housing in one embodiment of the present invention; Figure 5 This is a schematic diagram of a gear installed in the rear side of the main housing in one embodiment of the present invention; Figure 6 This is a partially enlarged view of the oil baffle ring in one embodiment of the present invention; Figure 7 This is a partially enlarged view of the engine bearing groove in one embodiment of the present invention; Figure 8 This is a cross-sectional view of an engine oil cooling unit in one embodiment of the present invention; Figure 9 This is a partially enlarged view of the oil dripping groove in one embodiment of the present invention; Figure 10 This is a cross-sectional view of the oil drip groove in one embodiment of the present invention; Figure 11 This is a partially enlarged view of the drive motor cavity in one embodiment of the present invention; Figure 12 This is a partially enlarged view of the oil cooling unit for the drive motor in one embodiment of the present invention; Figure 13 This is a cross-sectional view of the drive motor oil cooling unit in one embodiment of the present invention; Figure 14 This is a cross-sectional view of the drive motor in one embodiment of the present invention; Figure 15 This is a schematic diagram of the outer side of the front cover in one embodiment of the present invention; Figure 16This is a schematic diagram of the inner side of the front cover in one embodiment of the present invention; Figure 17 This is a cross-sectional view of a generator oil cooling unit in one embodiment of the present invention; Figure 18 This is a schematic diagram of the inner side of the rear end cover in one embodiment of the present invention; Figure 19 This is a partially enlarged view of the rear end cover in one embodiment of the present invention; Figure 20 This is a cross-sectional view of the intermediate bearing in one embodiment of the present invention; Figure 21 This is a schematic diagram of a generator and a drive motor installed in the main housing in one embodiment of the present invention; Figure 22 This is a schematic diagram of a drive motor in one embodiment of the present invention.

[0018] Reference table for attached figures: Drive system housing 1: Main housing 11: Generator chamber 111: Generator oil tank 1111, generator oil guide tank 1112; Drive motor cavity 112: drive motor oil groove 1121, drive motor oil guide groove 1122; Oil distribution chamber 113; Gear cavity 114: Engine bearing slot 1141, drive motor bearing slot 1142, generator bearing slot 1143, intermediate bearing slot 1144, differential bearing slot 114. Rear end cover 13: intermediate bearing groove 131, oil inlet groove 132; Front cover 12: Oil inlet hole 121; Oil pump 2, oil cooler 3; Engine oil cooling unit 4: Oil storage tank 41: First oil passage 411; Oil baffle ring 42: first oil hole 421, oil baffle plate 422, oil baffle boss 423, second oil hole 424; Engine shaft 43: First shaft cavity 431; Engine first bearing 44, engine second bearing 45, direct drive gear 46, oil drip groove 47, generator drive gear 48; Drive motor oil cooling unit 5: Second oil passage 51; Fuel injection pipe 52: Main fuel pipe 521, branch fuel pipe 522; Lubrication cavity 53; Generator oil cooling unit 6: third oil passage 61, second shaft cavity 62, bearing oil hole 63, stator oil hole 64, generator shaft 65, generator bearing 66, generator rotor 67, generator shaft pinion 68; Generator 7, intermediate bearing 9; Drive motor 8: Oil injection hole 81; A. Drive motor gear system; B. Generator gear system; C. Intermediate gear system; D. Differential gear system; E. Engine gear system. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0021] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0022] In some embodiments of the present invention, such as Figures 1-4 As shown, the oil cooling system includes a drive system housing 1, an oil pump 2, and an oil cooler 3; The drive system housing 1 includes a main housing 11, a front cover 12, and a rear cover 13. The main housing 11 includes a generator cavity 111, a drive motor cavity 112, a distribution oil cavity 113, and a gear cavity 114. The generator cavity 111, the distribution oil cavity 113, and the drive motor cavity 112 are located on the front side. The distribution oil cavity 113 is located between the generator cavity 111 and the drive motor cavity 112. The gear cavity 114 is located on the rear side. The front cover 12 covers the front side of the main housing 11, and the rear cover 13 covers the rear side of the main housing 11. Oil pump 2 pumps oil into oil cooler 3, and oil cooler 3 sends the cooled oil into distribution oil chamber 113. Distribution oil chamber 113 sends the oil into generator chamber 111 and drive motor chamber 112 respectively. It also includes an engine oil cooling unit 4, which includes an oil reservoir 41, an oil baffle ring 42, and an engine shaft 43. The oil reservoir 41 is located at the bottom of the engine bearing groove 1141 of the gear cavity 114. The engine shaft 43 is installed in the gear cavity 114 and aligned with the central axis of the engine bearing groove 1141. The oil reservoir 41 is connected to the generator cavity 111. The oil baffle ring 42 is located between the oil reservoir 41 and the engine shaft 43. The oil baffle ring 42 is provided with a first oil hole 421. Oil enters from the oil reservoir 41 through the first oil hole 421 into the first shaft cavity 431 in the engine shaft 43. The first shaft cavity 431 is provided with multiple cooling oil holes 432. The central axis of the first oil hole 421 is aligned with the central axis of the first shaft cavity 431.

[0023] Specifically, such as Figure 1 As shown, Figure 1 The front side of the drive system housing 1 is where the generator 7, drive motor 8, oil pump 2 and oil cooler 3 are installed. The generator 7 and drive motor 8 are installed inside the main housing 11, and the oil pump 2 and oil cooler 3 are installed outside the main housing 11.

[0024] like Figure 2 As shown, the front side of the main housing 11 includes a generator chamber 111, a drive motor chamber 112, and a distribution oil chamber 113. The distribution oil chamber 113 is located between the generator chamber 111 and the drive motor chamber 112, and the oil cooler 3 is connected to the distribution oil chamber 113. The oil pump 2 pumps oil into the oil cooler 3, which cools the oil. The cooled oil is then sent into the distribution oil chamber 113, which includes two chambers that communicate with the generator chamber 111 and the drive motor chamber 112 respectively, distributing the oil into the generator chamber 111 and the drive motor chamber 112.

[0025] like Figure 4 As shown, a gear cavity 114 is provided on the rear side of the main housing 11. The housing of the gear cavity 114 is provided with multiple bearing grooves, including an engine bearing groove 1141, a drive motor bearing groove 1142, a generator bearing groove 1143, an intermediate bearing groove 1144, and a differential bearing groove 1145.

[0026] like Figure 5 As shown, gear cavity 114 is used to install drive motor gear train A, generator gear train B, intermediate gear train C, differential gear train D and engine gear train E, as well as corresponding bearings and shafts.

[0027] like Figure 8 As shown, the engine oil cooling unit 4 includes an oil reservoir 41, an oil baffle ring 42, and an engine shaft 43. The engine oil cooling unit 4 is used to provide oil to the engine gear system E.

[0028] Specifically, such as Figure 7 As shown, the oil storage tank 41 is located at the bottom of the engine bearing groove 1141 of the gear cavity 114. The oil storage tank 41 is connected to the generator cavity 111. Part of the oil in the distribution oil cavity 113 enters the generator cavity 111, and part of the oil in the generator cavity 111 enters the oil storage tank 41. The oil storage tank 41 is used to store oil so that the oil can reach a certain height and generate sufficient oil pressure.

[0029] like Figure 6 As shown, the oil baffle ring 42 is installed above the oil storage tank 41, and the oil baffle ring 42 has a first oil hole 421 at its center, through which oil flows out from the oil storage tank 41.

[0030] like Figure 8 As shown, a first shaft cavity 431 extending axially is formed at the center of the engine shaft 43. One end of the first oil cavity 431 is closed, and the other end is open. The first oil hole 421 of the oil baffle ring 42 is aligned with the central axis of the first oil cavity 431. Oil flows from the first oil hole 421 into the first oil cavity 431, and finally flows into multiple cooling oil holes 432 on the first shaft cavity 431 to cool the engine bearings and gears.

[0031] Since the center of the first oil hole 421 is aligned with the central axis of the first oil chamber 431, the oil level in the first oil chamber 431 increases, thereby increasing the oil pressure flowing into the cooling oil hole 432. This allows the oil to enter the cooling oil hole 432 quickly, thereby improving the cooling efficiency of the engine's bearings and gears.

[0032] Furthermore, such as Figure 6 and Figure 8 As shown, the oil baffle ring 42 includes an oil baffle plate 422, an oil baffle boss 423 and a first oil hole 421. The oil baffle boss 423 is located in the middle of the oil baffle plate 422 and is inserted into the first shaft cavity 431. The first oil hole 421 is located at the center of the oil baffle boss 423.

[0033] Specifically, such as Figure 6 As shown, the oil baffle 422 is disc-shaped and covers the engine bearing groove 1141, preventing oil from flowing out from the edge of the oil baffle 422.

[0034] like Figure 8 As shown, the oil baffle 423 is located in the middle of the oil baffle plate 422 and protrudes towards the first oil cavity 431 and is inserted into the first oil cavity 431. The first oil hole 421 is located in the center of the oil baffle 423, so that the oil flows into the first oil cavity 431 from the first oil hole 421.

[0035] Furthermore, such as Figure 6 and Figure 8As shown, the oil baffle plate 422 is also provided with a second oil hole 424, and the engine first bearing 44 is installed in the engine bearing groove 1141. The engine first bearing 44 is sleeved on the engine shaft 43, and the second oil hole 424 sends oil into the engine first bearing 44.

[0036] Specifically, such as Figure 6 As shown, the second oil hole 424 is provided on the oil baffle plate 422, and the second oil hole 424 is spaced a certain distance from the first oil hole 421.

[0037] like Figure 8 As shown, the second oil hole 424 corresponds to the first bearing 44 of the engine. Some oil flows from the oil reservoir 422 through the second oil hole 424 into the first bearing 44, which plays a role in cooling and lubricating the first bearing 44.

[0038] Furthermore, such as Figures 7-8 As shown, the oil storage tank 41 is crescent-shaped, and the bottom of the oil storage tank 41 is provided with a first oil passage 411, which is connected to the generator cavity 111.

[0039] Specifically, such as Figure 3 As shown, a ring-shaped generator oil trough 1111 is provided in the generator chamber 111. The generator oil trough 1111 is connected to the distribution oil chamber 113 through the generator guide oil trough 1112. Part of the oil in the distribution oil chamber 113 flows from the generator guide oil trough 1112 into the ring-shaped generator oil trough 1111. The generator oil trough 1111 flows most of the oil into the generator 7, and some oil flows into the first oil passage 411.

[0040] Furthermore, such as Figure 8 As shown, an engine second bearing 45 and a direct drive gear 46 are mounted on the engine shaft 43. Multiple cooling oil holes 432 are respectively connected to the engine second bearing 45 and the direct drive gear 46 to cool and lubricate them.

[0041] Furthermore, such as Figure 5 As shown, the engine oil cooling unit 4 also includes an oil drip groove 47, which is disposed in the gear cavity 114; A generator drive gear 48 is mounted on the engine shaft 43. The generator drive gear 48 meshes with the generator shaft pinion 68. The oil drip groove 47 is located above the meshing point between the generator drive gear 48 and the generator shaft pinion 68.

[0042] Specifically, such as Figure 9As shown, the oil dripping tank 47 includes two right-angled plates. When the generator drive gear 48 rotates clockwise, it can bring the oil at the bottom to the top and splash it into the oil dripping tank 47. The oil dripping tank 47 can store a portion of the oil, while the oil drips downward from the oil dripping tank 47.

[0043] like Figure 10 As shown, the oil drip groove 47 is located directly above the meshing point of the generator drive gear 48 and the generator shaft pinion 68, so that the dripping oil falls precisely at the meshing point of the generator drive gear 48 and the generator shaft pinion 68. As the generator drive gear 48 and the generator shaft pinion 68 rotate, the oil enters the meshing point for lubrication, thus solving the problem of insufficient local lubrication at the meshing point of the generator drive gear 48 and the generator shaft pinion 68.

[0044] Furthermore, such as Figures 12-14 As shown, it also includes a drive motor oil cooling unit 5. The drive motor oil cooling unit 5 includes a second oil passage 51, an oil injection pipe 52 and a lubrication chamber 53. The second oil passage 51 is connected to the drive motor cavity 112. One end of the oil injection pipe 52 is connected to the drive motor cavity 112 and the other end is inserted into the lubrication chamber 53. The lubrication chamber 53 is radially opened in the drive motor bearing groove 1142. The drive motor bearing groove 1142 is arranged in the gear cavity 114.

[0045] Specifically, such as Figure 11 As shown, the drive motor cavity 112 includes an annular drive motor oil groove 1121, and the drive motor oil groove 1121 is connected to the distribution oil cavity 113 through the drive motor guide oil groove 1122. The distribution oil cavity 113 directs a portion of the oil into the drive motor oil groove 1121 through the drive motor guide oil groove 1122. The drive motor oil groove 1121 supplies most of the oil to the drive motor 8, and a small portion of the oil flows into the second oil passage 51.

[0046] like Figure 13 As shown, the red arrow indicates the direction of oil flow. The oil flows from the drive motor oil tank 1121 into the second oil passage 51, and then into the fuel injection pipe 52. The second oil passage 51 passes through the drive motor cavity 112 and into the gear cavity 114 in the main housing 11.

[0047] like Figure 12 As shown, the lubrication cavity 53 is radially formed in the drive motor bearing groove 1142, and the oil injection pipe 52 is inserted into the lubrication cavity 53.

[0048] like Figure 14 As shown, the lubrication chamber 53 is located between the two bearings of the drive motor 8, and can simultaneously lubricate and cool the two bearings.

[0049] Furthermore, such as Figure 12As shown, the fuel injection pipe 52 includes a main fuel pipe 521 and a branch fuel pipe 522. The main fuel pipe 521 faces the drive motor gear, and the branch fuel pipe 522 is inserted into the drive motor bearing groove 1142.

[0050] Part of the oil from the injection pipe 52 is sprayed onto the drive motor gears, while the remaining oil lubricates the bearings of the drive motor 8. Since this part of the drive motor gear train A is located at the very top of the gear cavity 114, it is difficult for oil to be carried to the top by splashing from the gears. Therefore, by introducing oil through the injection pipe 52 to the gears and bearings of the drive motor 8, sufficient cooling and lubrication can be achieved in these localized areas.

[0051] Furthermore, such as Figures 15-17 As shown, it also includes a generator oil cooling unit 6, which includes a third oil passage 61, a second shaft cavity 62, a bearing oil hole 63, and a stator oil hole 64. The third oil passage 61 is provided on the front end cover 12. One end of the third oil passage 61 is connected to the oil distribution chamber 113, and the other end is connected to the second shaft cavity 62. The second shaft cavity 62 is located at the center of the generator shaft 65, which is installed in the generator cavity 111. The bearing oil hole 63 and the stator oil hole 64 are opened on the generator shaft 65 and connect the second shaft cavity 62 with the generator bearing 66 and the generator rotor 67.

[0052] Specifically, such as Figure 15 As shown, the front cover 12 has a third oil passage 61, so there is no need to arrange oil pipes separately.

[0053] like Figure 16 As shown, the inner side of the front cover 12 is provided with an oil inlet hole 121, which is connected to the oil distribution chamber 113. The oil inlet hole 121 introduces oil into the third oil passage 61.

[0054] like Figure 17 As shown, the third oil passage 61 connects to the generator shaft 65 and is inserted into the second shaft cavity 62 at the center of the generator shaft 65. The inner wall of the second shaft cavity 62 has bearing oil holes 63 and stator oil holes 64 leading to the outer wall of the generator shaft 65. Generator bearings 66 and generator rotors 67 are mounted on the outside of the generator shaft 65. Multiple bearing oil holes 63 deliver oil to the two generator shafts 65, and multiple stator oil holes 64 deliver oil to the generator rotor 67, thus achieving cooling and lubrication of the generator gear train E.

[0055] Furthermore, such as Figures 18-20 As shown, the rear cover 13 is provided with an intermediate bearing groove 131, and an oil inlet groove 132 is provided radially on the lower edge of the intermediate bearing groove 131.

[0056] Specifically, such as Figure 19As shown, an intermediate bearing 9 is installed in the intermediate bearing groove 131, and oil can enter the oil inlet groove 132 by splashing, so that the oil flows into the intermediate bearing 9 and cools the intermediate bearing 9.

[0057] like Figure 20 As shown, the intermediate bearing 9 is a tapered bearing. During operation, the intermediate bearing 9 can generate negative pressure to quickly draw in oil, thereby improving cooling efficiency.

[0058] Furthermore, such as Figure 21 As shown, a generator 7 and a drive motor 8 are installed in the main housing 11, and the oil distribution chamber 113 directs oil to the generator 7 and the drive motor 8 respectively.

[0059] like Figure 22 As shown, the stator edge of the drive motor 8 is provided with multiple oil injection holes 81, from which oil is sprayed to cool the drive motor 8. The oil injection holes 81 are evenly spaced around the circumference of the drive motor 8. Typically, the oil flowing from the upper oil injection holes 81 flows downwards, ensuring that the entire drive motor 8 is cooled, while the lower oil injection holes 81 have less effect. Similarly, the oil injection holes on the generator 7 are arranged in a similar manner and operate on a similar principle. Therefore, in this embodiment, the lower oil injection holes of the drive motor 8 and generator 7 are closed, increasing the oil injection volume of the upper oil injection holes and thus improving cooling efficiency.

[0060] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. An oil cooling system, comprising a drive system housing, an oil pump, and an oil cooler; The drive system housing includes a main housing, a front cover, and a rear cover. The main housing includes a generator cavity, a drive motor cavity, a distribution oil cavity, and a gear cavity. The generator cavity, the distribution oil cavity, and the drive motor cavity are located on the front side. The distribution oil cavity is located between the generator cavity and the drive motor cavity. The gear cavity is located on the rear side. The front cover covers the front side of the main housing, and the rear cover covers the rear side of the main housing. The oil pump pumps oil into the oil cooler, the oil cooler sends the cooled oil into the distribution oil chamber, and the distribution oil chamber sends oil into the generator chamber and the drive motor chamber respectively. The characteristic of this feature is... It also includes an engine oil cooling unit, which includes an oil reservoir, an oil baffle ring, and an engine shaft. The oil reservoir is located at the bottom of the engine bearing groove in the gear cavity. The engine shaft is installed in the gear cavity and aligned with the central axis of the engine bearing groove. The oil reservoir communicates with the generator cavity. The oil baffle ring is located between the oil reservoir and the engine shaft. The oil baffle ring has a first oil hole. Oil enters from the oil reservoir through the first oil hole into the first shaft cavity in the engine shaft. The first shaft cavity has multiple cooling oil holes, and the central axis of the first oil hole is aligned with the central axis of the first shaft cavity.

2. The oil cooling system according to claim 1, characterized by The oil baffle ring includes an oil baffle plate, an oil baffle boss, and a first oil hole. The oil baffle boss is located in the middle of the oil baffle plate and is inserted into the first shaft cavity. The first oil hole is located at the center of the oil baffle boss.

3. The oil cooling system according to claim 2, characterized in that The oil baffle plate is also provided with a second oil hole, and the engine first bearing is installed in the engine bearing groove. The engine first bearing is sleeved on the engine shaft, and the second oil hole delivers oil to the engine first bearing.

4. The oil cooling system of claim 1, wherein The oil storage tank is crescent-shaped, and a first oil passage is provided at the bottom of the oil storage tank, which is connected to the generator cavity.

5. The oil cooling system of claim 1, wherein The engine shaft is equipped with a second engine bearing and a direct drive gear, and the plurality of cooling oil holes are respectively connected to the second engine bearing and the direct drive gear.

6. The oil cooling system of claim 1, wherein The engine oil cooling unit also includes an oil drip groove, which is disposed in the gear cavity; A generator drive gear is mounted on the engine shaft, and the generator drive gear meshes with the generator shaft pinion. The oil drip groove is located above the meshing point between the generator drive gear and the generator shaft pinion.

7. The oil cooling system of claim 1, wherein It also includes a drive motor oil cooling unit, which includes a second oil passage, an oil injection pipe and a lubrication chamber. The second oil passage is connected to the drive motor cavity. One end of the oil injection pipe is connected to the drive motor cavity and the other end is inserted into the lubrication chamber. The lubrication chamber is radially opened in the drive motor bearing groove, which is located in the gear cavity.

8. The oil cooling system according to claim 7, characterized in that The fuel injection pipe includes a main fuel pipe and a branch fuel pipe. The main fuel pipe faces the drive motor gear, and the branch fuel pipe is inserted into the drive motor bearing groove.

9. The oil cooling system of claim 1, wherein It also includes a generator oil cooling unit, which includes a third oil passage, a second shaft cavity, a bearing oil hole, and a stator oil hole; The third oil passage is provided on the front end cover, one end of the third oil passage is connected to the oil distribution chamber, and the other end is connected to the second shaft cavity; The second shaft cavity is located at the center of the generator shaft, the generator shaft is installed in the generator cavity, the bearing oil hole and the stator oil hole are opened on the generator shaft, and the second shaft cavity is connected to the generator bearing and the generator rotor.

10. The oil cooling system of claim 1, wherein The front end cover is provided with an intermediate bearing groove, and an oil inlet groove is provided radially on the lower edge of the intermediate bearing groove.

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