Electric motor assembly and vehicle

Abstract

The present disclosure relates to an electric assembly and a vehicle, the electric assembly comprising a box and two drive parts arranged in the box and respectively providing power for different wheels, the box comprising a first chamber accommodating one drive part and a second chamber accommodating the other drive part, each of the first chamber and the second chamber being provided with cooling oil and an oil supply part capable of delivering the cooling oil to the corresponding drive part, the cooling oil in the first chamber and the second chamber being not communicated with each other. In this way, the two oil supply parts can respectively supply oil to the corresponding drive part without considering the relationship (such as oil resistance, oil pump speed, etc.) between the two oil supply parts, reducing the design difficulty, and the two oil supply parts can be individually regulated at any time, which is convenient to operate.

Description

Technical Field

[0001] This disclosure relates to the field of electric powertrain technology, and more specifically, to an electric powertrain and a vehicle. Background Technology

[0002] A dual-motor drive assembly refers to a drive assembly that includes two independent motors and reducers. In related technologies, in order to supply cooling oil to the two motors and reducers separately, a main oil circuit connected to the oil pan and two branch oil circuits connected in series with the main oil circuit are usually provided. The two branch oil circuits are connected in parallel and each is equipped with an oil pump.

[0003] However, this design has at least the following problems: ① The oil passage damping of the two branch oil circuits needs to be completely symmetrical. If it is not symmetrical, uneven lubrication will occur. In addition, the two oil pumps must work at the same time and at the same speed, which is difficult to design. ② If one of the oil pumps needs to work alone, a check valve needs to be set for the other branch to prevent the cooling oil from being carried into the other branch, which increases the cost. ③ The two branch oil circuits share a common main oil circuit. Therefore, the oil pan needs to cover both motors and both reducers in the distribution direction of the two motors. The oil pan size is large, the design is difficult, and more cooling oil is needed, resulting in a larger weight of the drive assembly. Summary of the Invention

[0004] The purpose of this disclosure is to provide an electric powertrain and vehicle that at least partially solves the problems existing in the related art.

[0005] To achieve the above objectives, this disclosure provides an electric powertrain, including a housing and two drive units disposed within the housing that provide power to different wheels respectively. The housing includes a first chamber accommodating one of the drive units and a second chamber accommodating the other drive unit. The first chamber and the second chamber are respectively provided with cooling oil and an oil supply unit capable of supplying the cooling oil to the corresponding drive unit. The cooling oil in the first chamber and the second chamber are not in communication with each other.

[0006] Optionally, the drive unit includes a motor and a reducer, and the oil supply unit includes a main oil supply line and a plurality of parallel oil supply branches, wherein at least one of the oil supply branches is used to provide cooling oil to the motor, and at least one of the oil supply branches is used to provide cooling oil to the reducer.

[0007] Optionally, the support bearing of at least one of the power transmission shafts of the motor and the reducer corresponds to at least one of the oil supply branches.

[0008] Optionally, the reducer includes a plurality of gears, at least one of which corresponds to at least one of the oil supply branches.

[0009] Optionally, at least one of the gears is partially immersed in the cooling oil to splash the cooling oil onto the support bearing of the power transmission shaft of the reducer.

[0010] Optionally, the motor includes a rotor assembly and a stator assembly, the stator assembly being sleeved on the outer periphery of the rotor assembly.

[0011] Optionally, the rotor assembly's shaft is constructed as a hollow structure with a receiving cavity, and the shaft has a radially penetrating oil slinger hole, wherein at least one of the oil supply branches is used to supply cooling oil to the receiving cavity, and the shaft is configured such that when the shaft rotates, the cooling oil in the receiving cavity can be discharged to the stator assembly through the oil slinger hole.

[0012] Optionally, at least one of the oil supply branches is used to supply cooling oil to the stator assembly.

[0013] Optionally, the oil supply section further includes an oil injection pipe connected to an oil supply branch for supplying cooling oil to the stator assembly, the oil injection pipe having a plurality of oil injection holes facing the stator assembly.

[0014] Optionally, the oil supply unit further includes an oil cooler, and the housing has a first water-cooling channel to provide cooling water to the oil cooler. The first water-cooling channel is used to connect to the vehicle's cooling system.

[0015] Optionally, the system also includes a controller for controlling the two drive units. The housing of the controller has a second water-cooling channel. The first water-cooling channel includes a first inlet and a first outlet on the surface of the housing. The second water-cooling channel includes a second inlet and a second outlet. Cooling water from the first inlet flows to the second inlet and then flows out from the second outlet and is distributed to the two oil coolers. Cooling water flowing through the two oil coolers converges at the first outlet.

[0016] Optionally, the oil supply unit may further include a filter assembly and an oil pump.

[0017] Optionally, the filtration assembly includes a suction filter and a filter press, wherein the suction filter is located upstream of the oil pump and the filter press is located downstream of the oil pump.

[0018] According to a second aspect of this disclosure, a vehicle is provided, including the electric powertrain described above.

[0019] Through the above technical solution, the two oil supply units can each supply oil to their corresponding drive units without considering the relationship between the two oil supply units (such as oil resistance, oil pump speed, etc.), reducing design complexity. Furthermore, the two oil supply units can be individually controlled at any time, such as starting or stopping either oil pump, making operation convenient. In addition, by placing the two drive units in their respective separate chambers with no cooling oil flow between them, the first and second chambers can each have their own oil pans, reducing the size and design complexity of the oil pans (eliminating the need for a single large oil pan to cover both drive units), reducing the coolant volume of the electric powertrain, and consequently reducing the weight of the electric powertrain itself.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the cooling oil flow path of an electric powertrain, exemplarily shown according to this disclosure;

[0023] Figure 2 This is a schematic diagram of the cooling water flow path of an electric powertrain, as exemplarily shown in this disclosure;

[0024] Figures 3-6 These are schematic diagrams of an electric powertrain at different angles, exemplarily shown according to this disclosure;

[0025] Figure 7 This is a schematic diagram of an electric motor exemplarily shown according to this disclosure;

[0026] Figure 8 yes Figure 7 The cross-sectional view of the motor shown in the image;

[0027] Figure 9 This is a schematic diagram of an end cap of a box body exemplarily shown according to this disclosure;

[0028] Figures 10-12 This is a schematic diagram illustrating a box at different angles according to the present disclosure;

[0029] Figure 13 yes Figures 10-12 The cross-sectional view of the box shown in the figure.

[0030] Explanation of reference numerals in the attached figures

[0031] 100 - Housing; 101 - First inlet; 102 - First outlet; 110 - First chamber; 120 - Second chamber; 210 - Motor; 211 - Rotor assembly; 212 - Stator assembly; 213 - Shaft; 214 - Receiving cavity; 215 - Oil slinger hole; 220 - Reducer; 201 - First stage reduction gear; 202 - Output shaft gear; 310 - Main oil supply line; 321 - First branch; 322 - Second branch; 323 - Third branch; 324 - Fourth branch; 325 - Fifth branch; 326 - Sixth branch; 327 - Seventh branch; 328 - Eighth branch; 330 - Injection pipe; 331 - Injection hole; 340 - Oil cooler; 341 - ... Three inlets; 342 - Third outlet; 350 - Oil pump; 361 - Suction filter; 362 - Filter press; 370 - Oil pan; 400 - Controller; 401 - Second inlet; 402 - Second outlet; 510 - First bearing; 520 - Second bearing; 530 - Third bearing; 540 - Fourth bearing; 550 - Fifth bearing; 560 - Sixth bearing; 610 - Intermediate shaft; 620 - Input shaft; 630 - Output shaft; 700 - Cooling system; 801 - Oil cooler inlet branch; 901 - First oil outlet; 902 - First oil inlet; 903 - Second oil outlet; 904 - Second oil inlet; 905 - Third oil outlet; 906 - Third oil inlet. Detailed Implementation

[0032] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0033] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" may be based on the structure of the relevant components themselves or on the orientation of the relevant components when they are used together. For example, "the stator assembly is fitted on the outer periphery of the rotor assembly" means that the stator assembly is arranged around the outer periphery of the rotor assembly.

[0034] In this disclosure, the terms "first," "second," etc., are used to distinguish one element from another and do not indicate any order or importance. When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0035] Reference Figures 1-13This disclosure exemplarily illustrates an electric powertrain, including a housing 100 and two drive units disposed within the housing 100, each providing power to different wheels. For example, it could be a dual-motor assembly with independent motors at each wheel. In this case, "different wheels" could refer to the two front wheels or the two rear wheels of the vehicle. The electric powertrain is located between the two front wheels or the two rear wheels. The drive units may specifically include motors, reducers, etc., as will be described below. The housing 100 includes a first chamber 110 accommodating one drive unit and a second chamber 120 accommodating the other drive unit. The first chamber 110 and the second chamber 120 are respectively provided with cooling oil and an oil supply unit capable of delivering the cooling oil to their corresponding drive units. The cooling oil in the first chamber 110 and the second chamber 120 is not interconnected. It should be noted that the cooling oil, in addition to its cooling function, also lubricates components such as bearings.

[0036] This disclosure does not limit the specific structure of the housing 100, the first chamber 110, and the second chamber 120, as long as the housing 100 includes the first chamber 110 and the second chamber 120, and the drive unit is respectively housed in the first chamber 110 and the second chamber 120, and the cooling oil in the first chamber 110 and the second chamber 120 is not in communication with each other. In some embodiments, the housing 100 can be a single integral structure, specifically forming the first chamber 110 and the second chamber 120. Furthermore, in other embodiments, the housing 100 may also include two assembled parts, one forming the first chamber 110 and the other forming the second chamber 120.

[0037] This disclosure does not limit the oil supply unit, as long as it can supply the cooling oil in the first chamber 110 or the second chamber 120 to the corresponding components, such as bearings or motors. Specifically, it may include oil lines, pump bodies, etc. The specific structure of the oil supply unit will be described in detail below, and will not be repeated here.

[0038] By using the above technical solution, the two oil supply units can each supply oil to their corresponding drive units without considering the relationship between the two oil supply units (such as oil resistance, oil pump speed, etc.), reducing design complexity. Furthermore, the two oil supply units can be individually controlled at any time, such as starting or stopping either oil pump, making operation convenient. In addition, by placing the two drive units in their respective separate chambers with no cooling oil flow between them, the first chamber 110 and the second chamber 120 can each have their own oil pan, reducing the size and design complexity of the oil pan (eliminating the need for a large oil pan to cover both drive units simultaneously), reducing the coolant volume of the electric powertrain, and consequently reducing the weight of the electric powertrain itself.

[0039] Reference Figure 1In embodiments of this disclosure, the drive unit may include a motor 210 and a reducer 220, and the oil supply unit may include an oil supply main 310 and multiple parallel oil supply branches. At least one oil supply branch is used to supply cooling oil to the motor 210, and at least one oil supply branch is used to supply cooling oil to the reducer 220. By supplying oil to the reducer 220 and motor 210 through multiple parallel oil supply branches, this active oil supply method ensures effective cooling and lubrication, guaranteeing the durability and reliability of the reducer 220 and motor 210. Furthermore, the parallel connection of the oil supply branches to the reducer 220 and motor 210 avoids the problem in traditional series connection (where cooling oil flows sequentially through the reducer 220 and motor 210), where the cooling oil carries metallic impurities generated at the reducer 220 to the motor 210, where they are magnetically attracted, thus affecting the performance and lifespan of the motor 210.

[0040] It should be clarified that "parallel connection" here does not mean that all fuel supply branches belong to the same level. Some fuel supply branches can belong to the same level, and some can belong to different levels. This disclosure does not impose any restrictions, as long as, from the perspective of the overall fuel system, any two fuel supply branches are connected in parallel. Specifically, for example, in... Figure 1 In the illustrated embodiment, the first branch 321 and the third branch 323 are in a hierarchical relationship (the second branch 322 and the third branch 323 are connected in parallel to form oil road A, the eighth branch 328 and oil road A are connected in parallel to form oil road B, and oil road B and the first branch 321 are connected in parallel), but in fact, from the overall perspective, the two are also in a parallel relationship.

[0041] In the embodiments of this disclosure, the oil supply branch can be an additional oil pipe, or an oil passage formed on the housing 100, or a combination of an oil pipe and an oil passage. This disclosure does not limit this.

[0042] Reference Figure 1 In embodiments of this disclosure, at least one of the drive shafts of the motor 210 and the reducer 220 has a support bearing corresponding to at least one oil supply branch. Providing cooling oil directly to the support bearing through the oil supply branch ensures effective cooling and lubrication, improving its lifespan and reliability. This disclosure does not limit the drive shaft and support bearing; for example, in embodiments of this disclosure, the drive shaft can be the rotating shaft 213 of the motor 210, or it can be the input shaft 620, intermediate shaft 610, output shaft 630, etc. of the reducer 220. The support bearing can be a first bearing 510, a second bearing 520, a third bearing 530, etc.

[0043] Reference Figure 1In embodiments of this disclosure, the reducer 220 may include a plurality of gears, at least one of which corresponds to at least one oil supply branch. This design, by actively lubricating and cooling the gears through the oil supply branch, can improve the service life and reliability of the gears. For example, in Figure 1 In the illustrated embodiment, the first-stage reduction gear 201 of the reducer 220 may correspond to an oil supply branch. Furthermore, in some other embodiments, the second-stage reduction gear of the reducer 220 may also correspond to an oil supply branch, and this disclosure is not limiting in this regard.

[0044] In addition to the above-described active oil supply method for the reducer 220 and motor 210 via an oil supply branch, in some other embodiments, oil supply can also be achieved through gear splashing. Specifically, at least one gear of the reducer 220 can be partially immersed in cooling oil to splash the cooling oil onto the bearing supporting the power transmission shaft of the reducer 220, or onto the output shaft gear 202 of the reducer 220. This splashing oil supply can be used alone or in combination with the active oil supply method described above.

[0045] Reference Figure 1 In embodiments of this disclosure, the motor 210 may include a rotor assembly 211 and a stator assembly 212, with the stator assembly 212 sleeved on the outer periphery of the rotor assembly 211. The stator assembly 212 may include a stator core and windings, while the rotor assembly 211 may include a rotor core and a shaft 213.

[0046] In order to provide oil cooling for motor 210 and improve its power density and cooling effect, refer to Figure 1 , Figure 7 and Figure 8 In the embodiments of this disclosure, the rotor shaft 213 of the rotor assembly 211 can be constructed as a hollow structure with a receiving cavity 214, and the shaft 213 can have radially penetrating oil-throwing holes 215, the number of which can be one, three, five, etc. At least one oil supply branch is used to supply cooling oil to the receiving cavity 214, and the shaft 213 can be configured such that, when the shaft 213 rotates, the cooling oil in the receiving cavity 214 can be discharged to the stator assembly 212 through the oil-throwing holes 215. With this design, when the motor 210 is operating, the oil supply branch can supply cooling oil to the receiving cavity 214 to cool the shaft 213, and the cooling oil can be thrown to the outer periphery of the stator assembly 212, such as the stator core or the windings located at the end of the stator core, through the oil-throwing holes 215 to cool the stator assembly 212.

[0047] It should be noted that, in Figure 1In the illustrated embodiment, the rotating shaft 213 and the input shaft 620 are both hollow structures and interconnected. This is only a schematic diagram. In reality, the side of the rotating shaft 213 closest to the input shaft 620 is closed, that is, it is not connected to the input shaft 620.

[0048] Reference Figure 1 In embodiments of this disclosure, at least one oil supply branch can be used to supply cooling oil to the stator assembly 212. By actively supplying oil to the stator assembly 212 through the oil supply branch, sufficient cooling of the stator assembly 212 can be ensured, thereby increasing the power density of the motor 210. Figure 1 In the illustrated embodiment, the stator assembly 212 can be supplied with oil simultaneously through the oil supply branch and the oil slinger 215, thereby ensuring that the stator assembly 212 is adequately cooled.

[0049] Furthermore, referring to Figure 1 and Figure 9 In order to enable the oil supply branch to supply oil to the stator assembly 212 from all directions, in embodiments of this disclosure, the oil supply unit may further include an oil injection pipe 330 connected to the oil supply branch for supplying cooling oil to the stator assembly 212. The oil injection pipe 330 may have multiple oil injection holes 331 facing the stator assembly 212. During oil supply, cooling oil enters the oil injection pipe 330 through the oil supply branch and is sprayed onto the outer periphery of the stator assembly 212 through the oil injection holes 331, thereby achieving sufficient cooling. This disclosure limits the structure of the oil injection pipe 330 and the number of oil injection holes 331. The oil injection pipe 330 may be... Figure 9 The arc-shaped multi-branch structure shown can be provided with multiple oil injection holes 331 in each branch to ensure that the cooling oil is evenly sprayed onto the stator assembly 212. The oil injection pipe 330 can be fixed to the housing 100.

[0050] To facilitate understanding of the technical solution disclosed herein, the following is combined with... Figure 1 A specific embodiment of an oil circuit is described, referring to... Figure 1Specifically, multiple parallel oil supply branches may include: a first branch 321 for supplying cooling oil to the first bearing 510 on the side of the shaft 213 away from the reducer 220; a second branch 322 for supplying cooling oil to the second bearing 520 on the side of the intermediate shaft 610 near the motor 210; a third branch 323 for supplying cooling oil to the third bearing 530 on the side of the shaft 213 near the reducer 220 and the fourth bearing 540 on the side of the input shaft 620 near the motor 210; and a fourth branch 324 for supplying cooling oil to the bearing 530 on the side of the shaft 213 near the reducer 220. Cooling oil is provided to the third bearing 530 on one side of the input shaft 20 and the fourth bearing 540 on the side of the input shaft 620 closest to the motor 210; a fifth branch 325 is used to provide cooling oil to the fifth bearing 550 on the side of the input shaft 620 furthest from the motor 210 and the sixth bearing 560 on the side of the intermediate shaft 610 furthest from the motor 210; a sixth branch 326 is used to provide cooling oil to the first stage reduction gear 201 of the reducer 220; a seventh branch 327 is used to provide cooling oil to the receiving cavity 214; and an eighth branch 328 is used to provide cooling oil to the stator assembly 212. Specifically, the main oil supply line 310 pumps the cooling oil from the oil pan 370 and divides it into three parts. The first part enters the first branch line 321, the second part enters the seventh branch line 327, and the third part is divided into two paths. One path enters the eighth branch line 328, and the other path is further divided into two parts. One part enters the second branch line 322, and the other part enters the third branch line 323. The other path is also divided into two parts. One part enters the fourth branch line 324, and the other part enters the fifth branch line 325, and the other part enters the sixth branch line 326. After all the cooling oil has been cooled, it flows back to the oil pan 370 under gravity for the next cycle. It should be noted that only the oil circuit of one oil supply unit is described here; the oil circuit of the other oil supply unit is the same.

[0051] Furthermore, referring to Figures 5-6 The housing 100 may have a first oil outlet 901 and a first oil inlet 902 of the seventh branch 327, a second oil outlet 903 and a second oil inlet 904 of the first branch 321, and a third oil outlet 905 and a third oil inlet 906 of the third part.

[0052] To cool the cooling oil and ensure its effectiveness in cooling the motor 210 and reducer 220, refer to... Figures 1-4In embodiments of this disclosure, the oil supply unit may further include an oil cooler 340. In some embodiments, the oil cooler 340 may be specifically installed in the oil supply main 310. The housing 100 may have a first water-cooling channel (not shown in the figure) to provide cooling water to the oil cooler 340. The first water-cooling channel is used to connect to the vehicle's cooling system 700. It should be noted that the "cooling water" here is not limited to a certain liquid; it can be water, ethylene glycol, glycerin, etc., and can be selected according to actual needs. With this design, during use, the cooling water from the vehicle's cooling system 700 can flow into the first water-cooling channel to cool the cooling oil, ensuring the cooling effect of the cooling oil. After the cooling water and cooling oil exchange heat, it flows back to the cooling system 700 for cooling for the next cycle. This disclosure does not limit the type of oil cooler 340; for example, it can be a copper round tube type or an aluminum plate-fin type, as long as it can cool the cooling oil.

[0053] Reference Figures 2-4 , Figures 10-13 In embodiments of this disclosure, the electric powertrain may further include a controller 400 for controlling two drive units. The housing of the controller 400 may have a second water-cooling channel (not shown in the figure). The first water-cooling channel may include a first inlet 101 and a first outlet 102 formed on the surface of the housing 100. The second water-cooling channel may include a second inlet 401 and a second outlet 402. Cooling water from the first inlet 101 flows to the second inlet 401 and then flows out from the second outlet 402, branching to two oil coolers 340. Cooling water flowing through the two oil coolers 340 converges to the first outlet 102. Each oil cooler 340 may be provided with a third inlet 341 and a third outlet 342. Cooling water flowing out from the second outlet 402 enters the two third inlets 341 after passing through the oil cooler inlet branch 801. With this design, the water circuit connections of the two oil coolers 340 and the controller 400 are all designed on the housing 100 of the electric assembly. The housing 100 is connected to the outside only by a first water inlet 101 and a first water outlet 102, which simplifies the complicated water circuit connection method and makes assembly and maintenance more convenient.

[0054] To prevent impurities in the cooling oil from being carried into the motor 210 and the reducer 220 during circulation, refer to... Figure 1 In embodiments of this disclosure, the oil supply unit may further include a filter assembly and an oil pump 350. In some embodiments, the filter assembly and the oil pump 350 may be specifically located in the oil supply main. The filter assembly can filter impurities in the cooling oil to provide clean cooling oil for the motor 210 and the reducer 220.

[0055] This disclosure does not limit the specific composition of the filtering components, for example in Figure 1In the illustrated embodiment, the filtration assembly may include a suction filter 361 and a filter press 362. The suction filter 361 may be located upstream of the oil pump 350, and the filter press 362 may be located downstream of the oil pump 350. By configuring the suction filter 361 and the filter press 362, the cooling oil can be filtered twice to maximize the filtration of impurities in the cooling oil. This disclosure does not limit the types of suction filters 361 and filter press 362; they may be mesh type, wire-gap type, or paper cartridge type, etc. The filtration assembly may also include other filtration devices capable of filtering impurities in the cooling oil, and this disclosure does not limit this.

[0056] According to a second aspect of this disclosure, a vehicle is provided that includes the electric powertrain described above, and since the vehicle has all the beneficial effects of the electric powertrain described above, further details are omitted here.

[0057] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0059] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An electric powertrain, characterized in that, The device includes a housing and two drive units disposed within the housing, each providing power to different wheels. The housing includes a first chamber accommodating one drive unit and a second chamber accommodating the other drive unit. The first and second chambers are respectively provided with cooling oil and an oil supply unit capable of supplying the cooling oil to the corresponding drive unit. The cooling oil in the first and second chambers is not interconnected. The oil supply unit also includes an oil cooler, and the housing has a first water-cooling channel to provide cooling water to the oil cooler. The electric powertrain also includes a controller for controlling the two drive units. The housing of the controller has a second water-cooling channel. The first water-cooling channel includes a first inlet and a first outlet on the surface of the housing. The second water-cooling channel includes a second inlet and a second outlet. The cooling water from the first inlet flows to the second inlet and then flows out from the second outlet and is divided into two oil coolers. The cooling water flowing through the two oil coolers merges back into the first outlet.

2. The electric powertrain according to claim 1, characterized in that, The drive unit includes a motor and a reducer, and the oil supply unit includes a main oil supply line and multiple parallel oil supply branches. Wherein, at least one of the oil supply branches is used to supply cooling oil to the motor, and at least one of the oil supply branches is used to supply cooling oil to the reducer.

3. The electric powertrain according to claim 2, characterized in that, The bearing of at least one of the power transmission shafts of the motor and the reducer corresponds to at least one of the oil supply branches.

4. The electric powertrain according to claim 2, characterized in that, The reducer includes a plurality of gears, at least one of which corresponds to at least one of the oil supply branches.

5. The electric powertrain according to claim 4, characterized in that, At least one of the gears is partially immersed in the cooling oil to splash the cooling oil onto the support bearing of the power transmission shaft of the reducer.

6. The electric powertrain according to claim 2, characterized in that, The motor includes a rotor assembly and a stator assembly, with the stator assembly sleeved on the outer periphery of the rotor assembly.

7. The electric powertrain according to claim 6, characterized in that, The rotor assembly has a hollow shaft with a receiving cavity, and the shaft has a radially penetrating oil-throwing hole. At least one of the oil supply branches is used to supply cooling oil to the receiving cavity, and the rotating shaft is configured such that when the rotating shaft rotates, the cooling oil in the receiving cavity can be discharged to the stator assembly through the oil slinger hole.

8. The electric powertrain according to claim 6, characterized in that, At least one of the oil supply branches is used to supply cooling oil to the stator assembly.

9. The electric powertrain according to claim 8, characterized in that, The oil supply section also includes an oil injection pipe connected to an oil supply branch for supplying cooling oil to the stator assembly, the oil injection pipe having a plurality of oil injection holes facing the stator assembly.

10. The electric powertrain according to claim 1 or 2, characterized in that, The first water-cooled channel is used to connect to the vehicle's cooling system.

11. The electric powertrain according to claim 1 or 2, characterized in that, The oil supply unit also includes a filter assembly and an oil pump.

12. The electric powertrain according to claim 11, characterized in that, The filtration assembly includes a suction filter and a filter press, wherein the suction filter is located upstream of the oil pump and the filter press is located downstream of the oil pump.

13. A vehicle, characterized in that, Includes the electric powertrain according to any one of claims 1-12.

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