Cooling and lubricating system for hybrid powertrain

Abstract

A cooling and lubricating system for a hybrid powertrain, comprising a water cooling assembly and an oil cooling assembly. The water cooling assembly comprises a water inlet, a first water channel, a second water channel, an oil cooler and a water outlet which are connected in sequence; the first water channel is provided on a driving motor housing, and the second water channel is provided on a speed reducer housing; the oil cooling assembly comprises an oil pump, a first oil conveying channel, a second oil conveying channel, a third oil conveying channel, a first oil return channel and a second oil return channel; an oil inlet of the oil pump is communicated with the bottom of the speed reducer housing, and an oil outlet is communicated with the oil cooler; lubricating oil in the oil cooler is respectively conveyed to the speed reducer housing, the driving motor housing and a range-extending motor housing by means of the first oil conveying channel, the second oil conveying channel and the third oil conveying channel; and the first oil return channel is provided at the bottom of the driving motor housing, and the second oil return channel is provided at the bottom of the range-extending motor housing. The cooling and lubricating system employs an integrated cooling and lubricating mode, so that the structure of the hybrid powertrain is more compact, and the cooling and lubricating efficiency is higher.

Description

Cooling and lubrication system for hybrid powertrain

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on July 18, 2023, with application number 202310880043.2 and application name “A Cooling and Lubrication System for a Hybrid Powertrain,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the technical field of hybrid power systems, and in particular relates to a cooling and lubrication system for a hybrid powertrain. Background Art

[0004] With the rapid development of new energy vehicles, hybrid systems have become an effective way to compensate for insufficient battery life and address range anxiety. When the battery charge is low, the generator in the hybrid system converts fuel into electricity and supplies it to the drive motor, which then provides power to the vehicle. Because the motor in a hybrid system generates significant heat, ineffective heat dissipation can lead to motor burnout. Given that the cooling and lubrication system provides enhanced lubrication and cooling for hybrid systems, it has become a key factor in improving the overall power performance of the hybrid system.

[0005] Most existing hybrid power systems use water cooling for cooling and cooling, absorbing heat through the high specific heat capacity of water. Although the cost is low, the water channel structure can only be set on the shell structure of the hybrid power system, and it is impossible to directly cool the components inside the hybrid power system, resulting in low heat dissipation efficiency of the internal components. In addition, a small number of hybrid power systems use oil cooling for cooling and cooling. Although it can directly cool and lubricate the components inside the hybrid power system, the specific heat capacity of lubricating oil is much smaller than that of water, so the oil cooling design requires more lubricating oil, resulting in increased costs.

[0006] Application Contents

[0007] In response to the above problems, the present application discloses a cooling and lubrication system for a hybrid powertrain to overcome the above problems or at least partially solve the above problems.

[0008] In order to achieve the above objectives, this application adopts the following technical solutions:

[0009] The present application provides a cooling and lubrication system for a hybrid powertrain, wherein the hybrid powertrain includes a drive motor, a reducer, and a range-extending motor, and the cooling and lubrication system includes a water cooling component and an oil cooling component;

[0010] The water cooling assembly includes a water inlet nozzle, a first water channel, a second water channel, an oil cooler and a water outlet nozzle connected in sequence, the first water channel is provided on the housing of the drive motor, and the second water channel is provided on the housing of the reducer;

[0011] The oil cooling assembly includes an oil pump, a first oil delivery passage, a second oil delivery passage, a third oil delivery passage, a first oil return passage, and a second oil return passage. The oil inlet of the oil pump is communicated with the bottom of the reducer housing, and the oil outlet of the oil pump is communicated with the oil cooler. The lubricating oil in the oil cooler is respectively transported to the housing of the reducer, the housing of the drive motor, and the housing of the range-extending motor through the first oil delivery passage, the second oil delivery passage, and the third oil delivery passage. The first oil return passage is arranged at the bottom of the housing of the drive motor, and the second oil return passage is arranged at the bottom of the housing of the range-extending motor.

[0012] Furthermore, the first oil delivery channel includes a first main oil channel, a first branch oil channel, a second branch oil channel and a third branch oil channel;

[0013] The oil inlet end of the first main oil channel is connected to the oil cooler, and the oil outlet end of the first main oil channel is connected to the first branch oil channel, the second branch oil channel and the third branch oil channel respectively. The lubricating oil is transported to the first bearing position and the second bearing position in the housing of the reducer through the first branch oil channel, the lubricating oil is transported to the third bearing position and the fourth bearing position in the housing of the reducer through the second branch oil channel, and the lubricating oil is transported to the fifth bearing position and the sixth bearing position in the housing of the reducer through the third branch oil channel.

[0014] Furthermore, the oil outlet of the first oil distribution channel is arranged above the first bearing position, the second bearing position is arranged below the first bearing position, and the first bearing position and the second bearing position are connected through a first oil guide groove;

[0015] The oil outlet of the third oil distribution channel is arranged above the fifth bearing position, the sixth bearing position is arranged below the fifth bearing position, and the fifth bearing position and the sixth bearing position are connected through a second oil guide groove.

[0016] Furthermore, an oil collecting tank is provided above the third bearing position and the fourth bearing position, and the oil collecting tank is connected to the third bearing position and the fourth bearing position respectively through connecting oil channels, and the oil outlet hole of the second oil distribution channel is provided above the oil collecting tank.

[0017] Furthermore, the second oil delivery passage includes a second main oil passage, a fourth branch oil passage, and a fifth branch oil passage;

[0018] The oil inlet end of the second main oil channel is connected to the oil outlet end of the first main oil channel, and the oil outlet end of the second main oil channel is respectively connected to the fourth branch oil channel and the fifth branch oil channel. The lubricating oil is transported to the seventh bearing position in the housing of the drive motor through the fourth branch oil channel, and the lubricating oil is transported to the stator assembly of the drive motor through the fifth branch oil channel.

[0019] Furthermore, the fourth oil branch channel and the fifth oil branch channel are both arc-shaped structures, and the oil outlet holes of the fourth oil branch channel and the oil outlet holes of the fifth oil branch channel are both arranged in a ring shape. The oil outlet hole of the fourth oil branch channel is arranged above the seventh bearing position, and the oil outlet hole of the fifth oil branch channel is arranged above the stator assembly of the drive motor. A first oil distribution ring is provided between the oil outlet hole of the fifth oil branch channel and the stator assembly of the drive motor.

[0020] Furthermore, the third oil delivery passage includes a third main oil passage, a sixth branch oil passage, and a seventh branch oil passage;

[0021] The oil inlet end of the third main oil gallery is communicated with the oil outlet end of the first main oil gallery, and the oil outlet end of the third main oil gallery is communicated with the sixth branch oil gallery and the seventh branch oil gallery, respectively. The lubricating oil is delivered to the eighth bearing position in the housing of the range-extended motor through the sixth branch oil gallery, and the lubricating oil is delivered to the stator assembly of the range-extended motor through the seventh branch oil gallery.

[0022] Furthermore, the sixth oil branch channel and the seventh oil branch channel are both arc-shaped structures, and the oil outlet holes of the sixth oil branch channel and the oil outlet holes of the seventh oil branch channel are both arranged in a ring shape. The oil outlet hole of the sixth oil branch channel is arranged above the eighth bearing position, and the oil outlet hole of the seventh oil branch channel is arranged above the stator assembly of the range-extended motor. A second oil distribution ring is provided between the oil outlet hole of the seventh oil branch channel and the stator assembly of the range-extended motor.

[0023] Furthermore, the first water channel is arranged in an S shape on the housing of the drive motor.

[0024] Furthermore, the oil cooling assembly further includes an oil filter;

[0025] The oil filter is arranged between the oil inlet of the oil pump and the housing of the reducer.

[0026] The advantages and beneficial effects of this application are:

[0027] In the cooling and lubrication system of the present application, a water cooling assembly is provided on the housing of the drive motor and the housing of the reducer, and water with a large specific heat capacity is used to cool the housing of the drive motor and the housing of the reducer, so that the cooling and cooling effect is better. In addition, an oil cooling assembly is provided in the housing of the drive motor, the housing of the reducer and the housing of the range extender motor, so that the components in the hybrid powertrain can be directly lubricated and cooled. In addition, an oil cooler is provided to enable the water cooling assembly and the oil cooling assembly to exchange heat, so that the heat in the hybrid powertrain can be effectively conducted out, thereby reducing the temperature in the hybrid powertrain. The cooling and lubrication system adopts an integrated cooling and lubrication method, which makes the structure of the hybrid powertrain more compact and occupies less space. Furthermore, the cooling and lubrication system adopts an oil pump method to enable the lubricating oil to be directly sprayed on the components in the hybrid powertrain for lubrication and cooling. Not only is the cooling and lubrication efficiency high, but it can also effectively reduce the amount of lubricating oil used, saving the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0029] FIG1 is a schematic structural diagram of a cooling and lubrication system according to an embodiment of the present application;

[0030] FIG2 is a perspective structural diagram of a water cooling assembly in one embodiment of the present application;

[0031] FIG3 is a perspective structural diagram of an oil cooling assembly in one embodiment of the present application;

[0032] 4 and 5 are positional relationship diagrams of a first bearing position and a second bearing position in one embodiment of the present application;

[0033] FIG6 is a positional relationship diagram of a third bearing position and a fourth bearing position in one embodiment of the present application;

[0034] FIG7 is a positional relationship diagram of the fifth bearing position and the sixth bearing position in one embodiment of the present application.

[0035] In the figure: 1. Water inlet nozzle; 2. First water channel; 3. Second water channel; 4. Oil cooler; 5. Water outlet nozzle; 6. Oil pump; 7. First main oil channel; 8. First branch oil channel; 9. Second branch oil channel; 10. Third branch oil channel; 11. First bearing position; 12. Second bearing position; 13. Third bearing position; 14. Fourth bearing position; 15. Fifth bearing position; 16. Sixth bearing position; 17. First oil guide groove; 18. Second oil guide groove; 19. Oil collecting groove; 20. Second main oil channel; 21. Fourth branch oil channel; 22. Fifth branch oil channel; 23. Seventh bearing position; 24. First oil distribution ring; 25. Third main oil channel; 26. Sixth branch oil channel; 27. Seventh branch oil channel; 28. Eighth bearing position; 29. ​​Second oil distribution ring; 30. Oil filter; 31. Bearing pressure plate; 32. Oil channel cover; 33. Center plate. Specific embodiments

[0036] To make the purpose, technical solutions, and advantages of this application more clear, the following will provide a clear and complete description of the technical solutions of this application in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0038] In one embodiment of the present application, a cooling and lubrication system of a hybrid powertrain is disclosed. The hybrid powertrain includes a drive motor, a reducer, and a range extender motor. As shown in FIG1 to FIG3 , the cooling and lubrication system includes a water cooling component and an oil cooling component.

[0039] Specifically, the water cooling assembly includes a water inlet 1, a first water channel 2, a second water channel 3, an oil cooler 4, and a water outlet 5, which are connected in sequence. The first water channel 2 is arranged on the housing of the drive motor, and the second water channel 3 is arranged on the housing of the reducer. The water outlet 5 and the water inlet 1 are respectively connected to the water inlet and outlet ends of the external radiator. The water in the water cooling assembly first cools the housing of the drive motor through the first water channel 2, then cools the housing of the reducer through the second water channel 3, and then takes away the heat of the lubricating oil in the oil cooling assembly through the oil cooler 4. Finally, it flows into the external radiator, where it dissipates heat and cools down. The water that has completed heat dissipation and cooling enters the water cooling assembly again, and a new round of cooling cycle begins. Among them, the first water channel 2 is arranged in an S shape on the housing of the drive motor, so that the contact area between the first water channel 2 and the housing of the drive motor is larger, and the cooling effect is better.

[0040] In addition, the oil cooling assembly includes an oil pump 6, a first oil delivery passage, a second oil delivery passage, a third oil delivery passage, a first oil return passage and a second oil return passage. The oil inlet of the oil pump 6 is connected to the bottom of the reducer housing, and the oil outlet of the oil pump 6 is connected to the oil cooler 4. The lubricating oil in the oil cooler 4 is transported to the housing of the reducer through the first oil delivery passage, transported to the housing of the drive motor through the second oil delivery passage, and transported to the housing of the range extender motor through the third oil delivery passage. The first oil return passage is arranged at the bottom of the housing of the drive motor, and the lubricating oil in the housing of the drive motor flows back to the housing of the reducer through the first oil return passage. The second oil return passage is arranged at the bottom of the housing of the range extender motor, and the lubricating oil in the housing of the range extender motor flows back to the housing of the reducer through the second oil return passage.

[0041] In summary, in the cooling and lubrication system of this embodiment, by arranging water cooling components on the housing of the drive motor and the housing of the reducer, the housing of the drive motor and the housing of the reducer are cooled and cooled by using water with a large specific heat capacity, so that the cooling and cooling effect is better, and by arranging oil cooling components in the housing of the drive motor, the housing of the reducer and the housing of the range extender motor, direct lubrication and cooling of the components in the hybrid powertrain can be achieved. In addition, by arranging an oil cooler, the water cooling component and the oil cooling component can exchange heat, so that the heat in the hybrid powertrain can be effectively conducted out, thereby reducing the temperature in the hybrid powertrain; the cooling and lubrication system adopts an integrated cooling and lubrication method, which makes the structure of the hybrid powertrain more compact and occupies less space; further, the cooling and lubrication system adopts an oil pumping method so that the lubricating oil can be directly sprayed on the components in the hybrid powertrain for lubrication and cooling, which not only has high cooling and lubrication efficiency, but also can effectively reduce the amount of lubricating oil used, saving usage costs.

[0042] In this embodiment, as shown in FIG. 1 and FIG. 3 , the first oil delivery channel includes a first main oil channel 7 , a first branch oil channel 8 , a second branch oil channel 9 and a third branch oil channel 10 .

[0043] The oil inlet of the first main oil passage 7 is connected to the oil cooler 4, and the oil outlet of the first main oil passage 7 is respectively connected to the first branch oil passage 8, the second branch oil passage 9, and the third branch oil passage 10. Lubricating oil is delivered to the first bearing position 11 and the second bearing position 12 in the reducer housing through the first branch oil passage 8, the third bearing position 13 and the fourth bearing position 14 in the reducer housing through the second branch oil passage 9, and the fifth bearing position 15 and the sixth bearing position 16 in the reducer housing through the third branch oil passage 10. In this way, the lubricating oil can be directed to the gear shaft to be cooled and lubricated in the reducer housing through the first main oil passage 7, the first branch oil passage 8, the second branch oil passage 9, and the third branch oil passage 10, thereby improving the efficiency of cooling and lubrication. In addition, the first main oil channel 7, the first branch oil channel 8, the second branch oil channel 9 and the third branch oil channel 10 are arranged on the housing of the reducer, and the heat on the housing of the reducer can be taken away by the lubricating oil in the first main oil channel 7, the first branch oil channel 8, the second branch oil channel 9 and the third branch oil channel 10.

[0044] Specifically, as shown in Figures 1 and 3 to 7, the oil outlet of the first oil distribution channel 8 is located above the first bearing position 11, and the second bearing position 12 is located below the first bearing position 11. The first bearing position 11 and the second bearing position 12 are connected via a first oil guide groove 17. Furthermore, a bearing pressure plate 31 and an oil passage cover plate 32 are provided on either side of the first bearing position 11, respectively. Lubricating oil entering the first bearing position 11 is concentrated at the bottom of the first bearing position 11 by the bearing pressure plate 31 and the oil passage cover plate 32. The concentrated lubricating oil then enters the second bearing position 12 through the first oil guide groove 17.

[0045] The oil outlet of the third oil distribution channel 10 is arranged above the fifth bearing position 15 , and the sixth bearing position 16 is arranged below the fifth bearing position 15 . The fifth bearing position 15 and the sixth bearing position 16 are connected through the second oil guide groove 18 .

[0046] In addition, an oil collecting tank 19 is provided above the third bearing position 13 and the fourth bearing position 14. The oil collecting tank 19 is connected to the third bearing position 13 and the fourth bearing position 14 through connecting oil passages. The oil outlet of the second oil distribution passage 9 is provided above the oil collecting tank 19. The oil collecting tank 19, the third bearing position 13, and the fourth bearing position 14 can be provided on the center link plate 33 in the housing of the reducer.

[0047] The flow path of the lubricating oil in the reducer housing is as follows: a part of the lubricating oil in the first main oil channel 7 is first transported to the first bearing position 11 through the first branch oil channel 8, and then flows to the second bearing position 12 through the first oil guide groove 17, and finally falls back to the bottom of the reducer housing; another part of the lubricating oil in the first main oil channel 7 is first transported to the oil collecting tank 19 through the second branch oil channel 9, and then flows from the oil collecting tank 19 to the third bearing position 13 and the fourth bearing position 14, and finally falls back to the bottom of the reducer housing; another part of the lubricating oil in the first main oil channel 7 is first transported to the fifth bearing position 15 through the third branch oil channel 10, and then flows to the sixth bearing position 16 through the second oil guide groove 18, and finally falls back to the bottom of the reducer housing.

[0048] In this embodiment, as shown in FIG. 1 and FIG. 3 , the second oil delivery passage includes a second main oil passage 20 , a fourth branch oil passage 21 and a fifth branch oil passage 22 .

[0049] Specifically, the oil inlet of the second main oil passage 20 communicates with the oil outlet of the first main oil passage 7. The oil outlet of the second main oil passage 20 communicates with the fourth and fifth branch oil passages 21 and 22, respectively. Lubricating oil is delivered to the seventh bearing 23 within the drive motor housing via the fourth branch oil passage 21, and to the stator assembly of the drive motor via the fifth branch oil passage 22. Thus, the second main oil passage 20, the fourth branch oil passage 21, and the fifth branch oil passage 22 enable targeted delivery of lubricating oil to the gear shaft and stator assembly within the drive motor housing to be cooled and lubricated, improving cooling and lubrication efficiency. Furthermore, the fourth and fifth branch oil passages 21 and 22 are located on the drive motor housing, allowing the lubricating oil within them to remove heat from the drive motor housing. In contrast, the second main oil passage 20 is located externally of the drive motor housing via independent oil pipes. Of course, in other embodiments, the second main oil passage may also be located on the drive motor housing to further cool the drive motor housing. The stator assembly of the drive motor includes a stator winding and a stator core.

[0050] In addition, the fourth oil channel 21 and the fifth oil channel 22 are both arc-shaped structures, and the oil outlet holes of the fourth oil channel 21 and the oil outlet holes of the fifth oil channel 22 are both arranged in a ring shape. The oil outlet hole of the fourth oil channel 21 is arranged above the seventh bearing position 23, and the oil outlet hole of the fifth oil channel 22 is arranged above the stator assembly of the drive motor. In this way, the range of lubricating oil sprayed out by the fourth oil channel 21 and the fifth oil channel 22 is larger, thereby increasing the lubrication and cooling range; and, a first oil distribution ring 24 is provided between the oil outlet hole of the fifth oil channel 22 and the stator assembly of the drive motor, so that the lubricating oil distribution is more reasonable, and uniform cooling of the stator assembly can be achieved.

[0051] The flow path of the lubricating oil in the housing of the drive motor is as follows: a part of the lubricating oil in the second main oil channel 20 is first transported to the seventh bearing position 23 through the fourth oil branch channel 21, then falls back to the bottom of the housing of the drive motor, and finally flows back to the housing of the reducer through the first return oil channel; another part of the lubricating oil in the second main oil channel 20 is first transported to the first oil distribution ring 24 through the fifth oil branch channel 22, and then distributed to the stator assembly of the drive motor through the first oil distribution ring 24, and falls back to the bottom of the housing of the drive motor, and finally flows back to the housing of the reducer through the first return oil channel.

[0052] In this embodiment, as shown in FIG. 1 and FIG. 3 , the third oil delivery passage includes a third main oil passage 25 , a sixth branch oil passage 26 and a seventh branch oil passage 27 .

[0053] Specifically, the oil inlet of the third main oil gallery 25 communicates with the oil outlet of the first main oil gallery 7. The oil outlet of the third main oil gallery 25 communicates with the sixth and seventh branch oil galleries 26 and 27, respectively. Lubricating oil is delivered to the eighth bearing 28 within the range-extending motor housing via the sixth branch oil galleries 26, and to the stator assembly of the range-extending motor via the seventh branch oil galleries 27. In this way, the third, sixth, and seventh branch oil galleries 25, 26, and 27 deliver lubricating oil to the gear shaft and stator assembly within the range-extending motor housing to be cooled and lubricated, improving cooling and lubrication efficiency. Furthermore, the third, sixth, and seventh branch oil galleries 25, 26, and 27 are located within the range-extending motor housing, allowing the lubricating oil within these three channels to remove heat from the motor housing. The stator assembly of the range-extending motor includes stator windings and a stator core.

[0054] In addition, the sixth oil channel 26 and the seventh oil channel 27 are both arc-shaped structures, and the oil outlet holes of the sixth oil channel 26 and the oil outlet holes of the seventh oil channel 27 are both arranged in a ring shape. The oil outlet hole of the sixth oil channel 26 is arranged above the eighth bearing position 28, and the oil outlet hole of the seventh oil channel 27 is arranged above the stator assembly of the range-extending motor. In this way, the range of lubricating oil sprayed from the sixth oil channel 26 and the seventh oil channel 27 is larger, thereby increasing the lubrication and cooling range; and a second oil distribution ring 29 is provided between the oil outlet hole of the seventh oil channel 27 and the stator assembly of the range-extending motor, so that the lubricating oil distribution is more reasonable and uniform cooling of the stator assembly can be achieved.

[0055] The flow path of the lubricating oil in the housing of the range-extender motor is as follows: a portion of the lubricating oil in the third main oil channel 25 is first transported to the eighth bearing position 28 through the sixth oil branch channel 26, then falls back to the bottom of the housing of the range-extender motor, and finally flows back to the housing of the reducer through the second oil return channel; another portion of the lubricating oil in the third main oil channel 25 is first transported to the second oil distribution ring 29 through the seventh oil branch channel 27, then distributed to the stator assembly of the range-extender motor through the second oil distribution ring 29, falls back to the bottom of the housing of the range-extender motor, and finally flows back to the housing of the reducer through the second oil return channel.

[0056] Furthermore, the oil cooling assembly further includes an oil filter 30 .

[0057] Specifically, the oil filter 30 is arranged between the oil inlet of the oil pump 6 and the housing of the reducer for filtering the lubricating oil. In this way, the lubricating oil in the housing of the reducer can be filtered through the oil filter 30 before entering the oil pump 6 to remove particles in the lubricating oil, prevent the particles from clogging the oil channel and affecting the normal operation of the drive motor, the range extender motor and the reducer.

[0058] The above description is only a specific embodiment of the present application. Based on the above teachings of the present application, those skilled in the art may make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above description is only a better explanation of the purpose of the present application, and the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A cooling and lubrication system for a hybrid powertrain, characterized in that: The hybrid powertrain includes a drive motor, a reducer and a range-extending motor, and the cooling and lubrication system includes a water cooling component and an oil cooling component; The water cooling assembly comprises a water inlet nozzle, a first water channel, a second water channel, an oil cooler and a water outlet nozzle which are connected in sequence, the first water channel is arranged on the housing of the driving motor, and the second water channel is arranged on the housing of the reducer; The oil cooling assembly includes an oil pump, a first oil delivery passage, a second oil delivery passage, a third oil delivery passage, a first oil return passage, and a second oil return passage. The oil inlet of the oil pump is communicated with the bottom of the housing of the reducer, and the oil outlet of the oil pump is communicated with the oil cooler. The lubricating oil in the oil cooler is respectively transported to the housing of the reducer, the housing of the drive motor, and the housing of the range-extending motor through the first oil delivery passage, the second oil delivery passage, and the third oil delivery passage. The first oil return passage is arranged at the bottom of the housing of the drive motor, and the second oil return passage is arranged at the bottom of the housing of the range-extending motor.

2. The cooling and lubrication system of the hybrid powertrain according to claim 1, characterized in that: The first oil delivery channel includes a first main oil channel, a first branch oil channel, a second branch oil channel and a third branch oil channel; The oil inlet end of the first main oil channel is connected to the oil cooler, and the oil outlet end of the first main oil channel is connected to the first branch oil channel, the second branch oil channel and the third branch oil channel respectively. The lubricating oil is transported to the first bearing position and the second bearing position in the housing of the reducer through the first branch oil channel, the lubricating oil is transported to the third bearing position and the fourth bearing position in the housing of the reducer through the second branch oil channel, and the lubricating oil is transported to the fifth bearing position and the sixth bearing position in the housing of the reducer through the third branch oil channel.

3. The cooling and lubrication system of the hybrid powertrain according to claim 2, characterized in that: The oil outlet hole of the first oil distribution channel is arranged above the first bearing position, the second bearing position is arranged below the first bearing position, and the first bearing position and the second bearing position are connected through the first oil guide groove; The oil outlet hole of the third oil distribution channel is arranged above the fifth bearing position, the sixth bearing position is arranged below the fifth bearing position, and the fifth bearing position and the sixth bearing position are connected through a second oil guide groove.

4. The cooling and lubrication system of the hybrid powertrain according to claim 2, characterized in that: An oil collecting trough is provided above the third bearing position and the fourth bearing position. The oil collecting trough is connected to the third bearing position and the fourth bearing position respectively through connecting oil passages. The oil outlet of the second oil distribution passage is provided above the oil collecting trough.

5. The cooling and lubrication system of the hybrid powertrain according to claim 2, characterized in that: The second oil delivery passage includes a second main oil passage, a fourth branch oil passage and a fifth branch oil passage; The oil inlet end of the second main oil channel is connected to the oil outlet end of the first main oil channel, and the oil outlet end of the second main oil channel is respectively connected to the fourth branch oil channel and the fifth branch oil channel, and the lubricating oil is transported to the seventh bearing position in the housing of the drive motor through the fourth branch oil channel, and the lubricating oil is transported to the stator assembly of the drive motor through the fifth branch oil channel.

6. The cooling and lubrication system of the hybrid powertrain according to claim 5, characterized in that: The fourth oil branch channel and the fifth oil branch channel are both arc-shaped structures, and the oil outlet holes of the fourth oil branch channel and the oil outlet holes of the fifth oil branch channel are both arranged in a ring shape. The oil outlet hole of the fourth oil branch channel is arranged above the seventh bearing position, and the oil outlet hole of the fifth oil branch channel is arranged above the stator assembly of the drive motor. A first oil distribution ring is provided between the oil outlet hole of the fifth oil branch channel and the stator assembly of the drive motor.

7. The cooling and lubrication system of the hybrid powertrain according to claim 2, characterized in that: The third oil delivery passage includes a third main oil passage, a sixth branch oil passage and a seventh branch oil passage; The oil inlet end of the third main oil gallery is communicated with the oil outlet end of the first main oil gallery, and the oil outlet end of the third main oil gallery is communicated with the sixth branch oil gallery and the seventh branch oil gallery, respectively. The lubricating oil is transported to the eighth bearing position in the housing of the range-extended motor through the sixth branch oil gallery, and the lubricating oil is transported to the stator assembly of the range-extended motor through the seventh branch oil gallery.

8. The cooling and lubrication system of the hybrid powertrain according to claim 7, characterized in that: The sixth oil branch passage and the seventh oil branch passage are both arc-shaped structures, and the oil outlet holes of the sixth oil branch passage and the oil outlet holes of the seventh oil branch passage are both arranged in a ring shape. The oil outlet hole of the sixth oil branch passage is arranged above the eighth bearing position, and the oil outlet hole of the seventh oil branch passage is arranged above the stator assembly of the range-extending motor. A second oil branch ring is provided between the oil outlet hole of the seventh oil branch passage and the stator assembly of the range-extending motor.

9. The cooling and lubrication system of a hybrid powertrain according to any one of claims 1 to 8, characterized in that: The first water channel is arranged in an S shape on the housing of the driving motor.

10. The cooling and lubrication system of a hybrid powertrain according to any one of claims 1 to 8, characterized in that: The oil cooling assembly also includes an oil filter; The oil filter is arranged between the oil inlet of the oil pump and the housing of the reducer.

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