Power assembly and electric vehicle

Abstract

The utility model provides a power assembly and an electric vehicle, a shell of the power assembly is used for fixing a stator of a driving motor and containing a rotor of the driving motor, the rotor of the driving motor is fixed to a motor shaft of the driving motor, and the motor shaft of the driving motor is used for being in transmission connection with an input shaft of a speed reducer. Wherein the motor shaft comprises a cooling flow channel and a lubricating flow channel, and the cooling flow channel is used for conveying one path of oil liquid to a rotor of the driving motor for cooling, so that even under the condition that the motor shaft rotates at a high speed, the oil liquid circulating in the motor shaft can cool the rotor of the driving motor through the cooling flow channel and can also cool the rotor of the driving motor through the lubricating flow channel; and the lubricating flow channel is used for conveying another path of oil to the speed reducer for lubrication, so that when the motor shaft rotates, the oil lubricates the speed reducer through the lubricating flow channel, and normal operation of the speed reducer is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a power assembly and an electric vehicle. BACKGROUND

[0002] In order to meet the power demand of new energy vehicles, the power density demand of the driving motor is increasing, the greater the power of the driving motor, the higher the requirement for the heat dissipation capacity of the driving motor, the gear shaft assembly and the motor rotor in the power assembly need to be cooled and lubricated by oil. The motor rotor can generally be cooled by the way of the oil channel in the shell and the oil guide pipe, the lubricating oil is guided into the inner hole of the motor shaft from the end of the motor shaft, and then reaches the motor rotor through the oil injection hole of the motor shaft to cool the motor rotor. However, when the motor shaft rotates at high speed, the oil in the shaft is often thrown out at the halfway oil hole, and cannot flow to the other end of the motor shaft to cool the whole shaft, nor can the oil in the motor shaft be transmitted to the gear shaft assembly of the reducer for lubrication. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a power assembly and an electric vehicle, so that the oil in the motor shaft can also lubricate the reducer under the condition of high-speed rotation of the driving motor.

[0004] In the first aspect, the present application provides a power assembly, the shell of the power assembly is used to fix the stator of the driving motor and accommodate the rotor of the driving motor, the rotor of the driving motor is fixed to the motor shaft of the driving motor, and the motor shaft of the driving motor is used to drivingly connect the input shaft of the reducer. Wherein, the motor shaft comprises a cooling flow channel and a lubricating flow channel, the cooling flow channel is used to transport one way of oil to the rotor of the driving motor for cooling, and the lubricating flow channel is used to transport another way of oil to the reducer for lubrication.

[0005] In the embodiment of the present application, the motor shaft of the driving motor rotates at high speed when working, the driving motor generates a large amount of heat, and oil needs to be introduced into the motor shaft to cool it. The cooling flow channel and the lubricating flow channel are arranged in the motor shaft at the same time, the cooling flow channel is used to transport one way of oil to the rotor of the driving motor for cooling, and the lubricating flow channel is used to transport another way of oil to the reducer for lubrication. The oil introduced into the motor shaft can be divided into two ways, one way of oil is used to cool the rotor of the driving motor, so that the driving motor will not fail due to overheating, and the other way of oil is used to lubricate the gear of the reducer, which is conducive to reducing the rotating resistance between the gear shaft assemblies of the reducer and improving the working efficiency of the reducer. The arrangement of the cooling flow channel and the lubricating flow channel can also make the oil flow through the whole motor shaft, so that the oil can fully cool and lubricate the whole motor shaft.

[0006] If only through the oil hole arranged on the motor shaft to use the oil throwing when the motor shaft rotates to cool the rotor of the driving motor, with the rotor rotation speed of the driving motor getting higher and higher, the oil is almost all thrown out to cool the rotor of the driving motor after passing through the oil hole, so that the oil cannot flow through the whole motor shaft, and further the reducer cannot receive the oil transported from the motor shaft, so that the heat generated by the reducer increases, the carrying capacity of the reducer is reduced, the service life is shortened, and the normal work of the reducer is not conducive.

[0007] In the embodiment of the present application, by arranging the lubricating flow channel and the cooling flow channel in the motor shaft respectively, the flow channel for cooling the rotor of the driving motor and the flow channel for lubricating the reducer are two flow channels, so that even in the case of high-speed rotation of the motor shaft, the other oil flowing in the motor shaft can pass through the lubricating flow channel to lubricate the reducer, which is conducive to ensuring the normal operation of the reducer.

[0008] In an embodiment, the flow rate of the other oil transported by the lubricating flow channel of the motor shaft is greater than the flow rate of the oil transported by the cooling flow channel of the motor shaft. And / or the path of the other oil flowing through the lubricating flow channel is greater than the path of the oil flowing through the cooling flow channel.

[0009] In the embodiment of the present application, the flow rate of the other oil transported by the lubricating flow channel of the motor shaft is greater than the flow rate of the oil transported by the cooling flow channel of the motor shaft, so that more oil in the motor shaft can be used to lubricate the reducer, meet the lubrication demand of the reducer in the low-temperature environment, and be conducive to ensuring the normal operation of the reducer in the low-temperature environment. The smaller flow rate of the oil in the cooling flow channel can also meet the cooling demand of the rotor of the driving motor in the low-temperature environment.

[0010] In an embodiment, the path of the other oil flowing through the lubricating flow channel is greater than the path of the oil flowing through the cooling flow channel.

[0011] Since the driving motor generates a large amount of heat during operation, the driving motor needs to be cooled in time to avoid overheating. In the embodiment, the path of the one-way oil flow through the cooling flow channel is relatively small, so that the cooling flow channel can be arranged relatively close to the lubricating flow channel, and the one-way oil flow in the cooling flow channel can be sprayed more closely to the rotor of the driving motor, so that the rotor of the driving motor can be cooled more sufficiently. If the path of the one-way oil flow to the cooling flow channel is designed to be relatively long, the time for the one-way oil flow to be transmitted to the rotor of the driving motor is too long, which is not conducive to cooling the rotor of the driving motor in time. Therefore, in the present application, the path of the other-way oil flow through the lubricating flow channel is designed to be longer than the path of the one-way oil flow through the cooling flow channel, so that the lubricating flow channel can provide a separate lubricating flow channel for the reducer while the driving motor can be cooled in time, so that the working efficiency of the driving motor is improved and the working performance of the reducer is better, thereby improving the overall performance of the power assembly.

[0012] In one embodiment, the flow rate of the other-way oil flow through the lubricating flow channel is greater than the flow rate of the one-way oil flow through the cooling flow channel of the motor shaft, and the path of the other-way oil flow through the lubricating flow channel is greater than the path of the one-way oil flow through the cooling flow channel. This makes the driving motor work more efficiently and the reducer work better even in a low-temperature environment, thereby improving the overall performance of the power assembly.

[0013] In one embodiment, the openings of the inlet and outlet of the lubricating flow channel are oriented in opposite directions along the axial direction of the power assembly, the opening of the inlet of the cooling flow channel is oriented in the same direction as the opening of the inlet of the lubricating flow channel, and the opening of the outlet of the cooling flow channel is oriented parallel to the radial direction of the power assembly.

[0014] In the embodiment, the openings of the inlet and outlet of the lubricating flow channel are oriented in opposite directions along the axial direction of the power assembly, so that the other-way oil flow in the lubricating flow channel of the motor shaft can be transmitted to the reducer in a faster and shorter path along the axial direction of the power assembly, thereby lubricating the reducer and ensuring the normal operation of the reducer. The lubricating flow channel can also be conveniently machined in the motor shaft.

[0015] In the embodiment of the present application, the opening direction of the inlet of the cooling flow channel is the same as that of the inlet of the lubricating flow channel, so that the cooling flow channel and the lubricating flow channel can simultaneously receive oil from the motor shaft, ensuring that the oil in the motor shaft is branched, and ensuring that oil can flow through the cooling flow channel and the lubricating flow channel, so that the rotor of the driving motor can be cooled while the gear shaft assembly of the reduction gearbox can be fully lubricated. Compared with the design in which the opening direction of the inlet of the cooling flow channel is different from that of the inlet of the lubricating flow channel, the opening direction of the inlet of the cooling flow channel is the same as that of the inlet of the lubricating flow channel, which is conducive to simplifying the flow channel design, so that the cooling flow channel and the lubricating flow channel can receive oil from the same side, and the oil feeding structure design for the cooling flow channel and the lubricating flow channel is more concentrated and simplified.

[0016] In the embodiment of the present application, one of the oil in the cooling flow channel is used to cool the rotor of the driving motor, so that the opening direction of the outlet of the cooling flow channel is parallel to the radial direction of the power assembly, and the opening direction of the outlet of the cooling flow channel is consistent with the direction of the centrifugal force of the motor shaft rotation, which is more conducive to the oil in the cooling flow channel being thrown out of the cooling flow channel to the rotor of the driving motor through the high-speed rotation of the motor shaft, and cooling the rotor of the driving motor.

[0017] In one embodiment, the inlet of the cooling flow channel surrounds the outer periphery of the inlet of the lubricating flow channel, and the inlet of the cooling flow channel and the inlet of the lubricating flow channel are spaced apart along the radial direction of the power assembly.

[0018] In the embodiment of the present application, the inlet of the cooling flow channel surrounds the outer periphery of the inlet of the lubricating flow channel, so that the lubricating flow channel can be arranged at a position close to the motor shaft axis of the motor shaft, and the cooling flow channel is arranged close to the outer periphery of the motor shaft, so that one of the oil in the cooling flow channel can be more conveniently thrown out of the cooling flow channel through the rotation of the motor shaft to cool the rotor of the driving motor.

[0019] In the embodiment of the present application, the inlet of the cooling flow channel and the inlet of the lubricating flow channel are spaced apart along the radial direction of the power assembly, so that one of the oil in the cooling flow channel and the other of the oil in the lubricating flow channel can flow relatively independently, so as to ensure that one of the oil in the motor shaft is used for lubricating the reduction gearbox, and the other of the oil is used for cooling the rotor of the driving motor.

[0020] In one embodiment, the cooling flow channel and the lubricating flow channel can be integrally machined in the motor shaft, so that the motor shaft has higher structural strength.

[0021] In one embodiment, the radial direction of the power assembly is greater than the width of the inlet of the cooling flow channel.

[0022] In the embodiment of the present application, the diameter of the inlet of the lubricating flow channel along the radial direction of the power assembly is greater than the width of the inlet of the cooling flow channel, so that the amount of the other oil flowing into the lubricating flow channel is greater than the amount of the oil flowing into the cooling flow channel, so that sufficient oil can be transported to the reducer when the environment is at low temperature, so as to lubricate the reducer and facilitate the normal operation of the reducer.

[0023] In the embodiment of the present application, the cooling flow channel surrounds the lubricating flow channel, and the width of the inlet of the cooling flow channel is small, which is beneficial to keep the motor shaft with a thick wall thickness, so that the motor shaft has stronger reliability.

[0024] In an embodiment, the inlet of the cooling flow channel surrounds the outer periphery of the inlet of the lubricating flow channel, and the diameter of the inlet of the lubricating flow channel along the radial direction of the power assembly is greater than the width of the inlet of the cooling flow channel. In the embodiment of the present application, when the inlet of the cooling flow channel surrounds the outer periphery of the inlet of the lubricating flow channel, the cooling flow channel is annular, so that when the width of the inlet of the cooling flow channel is less than the diameter of the inlet of the lubricating flow channel, the flow area of the inlet of the cooling flow channel can be greater than the flow area of the inlet of the cooling flow channel, and the lubrication demand of the reducer can be met under the condition of meeting the cooling demand of the driving motor.

[0025] In an embodiment, along the axial direction of the power assembly, the spacing between the inlet and the outlet of the cooling flow channel is less than the spacing between the inlet and the outlet of the lubricating flow channel.

[0026] In the embodiment of the present application, along the axial direction of the power assembly, the spacing between the inlet and the outlet of the cooling flow channel is less than the spacing between the inlet and the outlet of the lubricating flow channel, so that along the axial direction of the power assembly, the length of the cooling flow channel is shorter than the length of the lubricating flow channel, which is beneficial to make the oil flowing through the cooling flow channel closer to the rotor of the driving motor, so that the oil ejected from the outlet of the cooling flow channel can better cover the rotor of the driving motor, and the cooling efficiency of the one oil to the rotor of the driving motor is improved. The spacing between the inlet and the outlet of the lubricating flow channel is large, so that a longer lubricating flow channel can be obtained, which is beneficial to transport the other oil to the reducer arranged at a far end through the motor shaft for lubrication, and the normal operation of the reducer is ensured.

[0027] In an embodiment, the motor shaft further comprises a radial flow channel, the inlet of the radial flow channel is used for connecting the cooling flow channel, and the outlet of the radial flow channel is parallel to the radial direction of the power assembly, and the radial flow channel is used for transmitting the one oil output by the cooling flow channel to the rotor of the driving motor.

[0028] In the embodiment of the present application, the motor shaft further comprises a radial flow channel, the inlet of the radial flow channel is used for connecting the cooling flow channel, so that the one oil in the cooling flow channel can flow out to the rotor of the driving motor through the radial flow channel.

[0029] In the embodiment of the present application, the outlet of the radial flow channel is parallel to the radial direction of the power assembly, so that the length of the radial flow channel can be shorter, and it is more conducive to the motor shaft to quickly pass through the radial flow channel to throw the oil in the cooling flow channel to the rotor of the driving motor during high-speed rotation, thereby improving the cooling efficiency of the rotor of the driving motor.

[0030] In an embodiment, the motor shaft includes two radial flow channels, and the distances between the two radial flow channels and the inlet of the cooling flow channel in the axial direction of the power assembly are different.

[0031] In the embodiment of the present application, the motor shaft includes two radial flow channels, and the distances between the two radial flow channels and the inlet of the cooling flow channel in the axial direction of the power assembly are different, so that the oil in the cooling flow channel can be thrown out at different positions of the motor shaft, which is more conducive to the oil being thrown out to have a larger contact area with the rotor of the driving motor, thereby improving the cooling efficiency.

[0032] In the embodiment of the present application, when the rotational speed of the motor shaft of the driving motor is relatively low, the centrifugal force acting on the oil in the cooling flow channel is relatively small, and the oil in the cooling flow channel is prone to flow back to the inlet of the cooling flow channel. The radial flow channel is arranged at a position close to the inlet of the cooling flow channel, which is conducive to the oil flowing through the radial flow channel and flowing out to the rotor of the driving motor, so as to ensure that the rotor of the driving motor has sufficient oil for cooling.

[0033] In an embodiment, the motor shaft includes a rotating shaft and an oil pipe, the rotating shaft includes a shaft cavity, the shaft cavity penetrates the motor shaft in the axial direction of the power assembly, and the shaft cavity is used to accommodate and fix the oil pipe. The oil pipe includes a through hole, the through hole penetrates the oil pipe in the axial direction of the power assembly, and the through hole is used to form a lubricating flow channel.

[0034] In the embodiment of the present application, the motor shaft includes a rotating shaft and an oil pipe, the rotating shaft includes a shaft cavity, the shaft cavity penetrates the motor shaft in the axial direction of the power assembly, so that the oil pipe can be arranged in the shaft cavity of the rotating shaft. Dividing the motor shaft into the rotating shaft and the oil pipe is also conducive to facilitating the processing of the lubricating flow channel and simplifying the processing process.

[0035] In the embodiment of the present application, the through hole of the oil pipe penetrates the oil pipe in the axial direction of the power assembly, which facilitates the processing of the through hole in the oil pipe to form the lubricating flow channel. In addition, the lubricating flow channel can be parallel to the axial direction of the power assembly, so that another oil in the lubricating flow channel can be transmitted to the reducer located on the side of the driving motor at a faster speed and a shorter distance for lubricating the gear shaft assembly of the reducer, thereby facilitating the normal operation of the reducer.

[0036] In an embodiment, the oil duct further comprises an annular groove recessed from the end face of one end of the oil duct towards the other end of the oil duct along the axial direction of the power assembly, the annular groove surrounds the through hole, and the annular groove is used to form the cooling flow channel, the opening of the annular groove is the inlet of the cooling flow channel, and the wall of the annular groove comprises a through hole penetrating through the wall of the annular groove along the radial direction of the power assembly, and the through hole is the outlet of the cooling flow channel.

[0037] In an embodiment, the oil duct further comprises an annular groove recessed from the end face of one end of the oil duct towards the other end of the oil duct along the axial direction of the power assembly, thereby facilitating machining of the annular groove from one end of the oil duct or facilitating demolding of the annular groove from the other end of the oil duct.

[0038] In an embodiment, the annular groove surrounds the through hole, and the annular groove is used to form the cooling flow channel, so that the cooling flow channel can be arranged around the outer periphery of the lubricating flow channel in the through hole, the cooling flow channel in the annular groove and the lubricating flow channel in the through hole can respectively and independently transport oil, and thus one of the oil input into the oil duct can be used for cooling the rotor of the driving motor, thereby avoiding overheating of the driving motor and failure of the driving motor, and the other oil can be used for lubricating the speed reducer, thereby facilitating normal operation of the speed reducer.

[0039] In an embodiment, the opening of the annular groove is the inlet of the cooling flow channel, so that one of the oil can flow into the cooling flow channel through the opening of the annular groove, the wall of the annular groove comprises a through hole penetrating through the wall of the annular groove along the radial direction of the power assembly, and the through hole is the outlet of the cooling flow channel, so that one of the oil in the cooling flow channel can be guided out of the annular groove through the through hole in the wall of the annular groove, and the rotor of the driving motor can be cooled.

[0040] In an embodiment, the through hole penetrates through the wall of the annular groove along the radial direction of the power assembly, so that the through hole can be directly machined along the radial direction of the power assembly from the oil duct, the length of the through hole can be shortened, the oil can be sprayed along the radial direction of the power assembly at a faster speed when the motor shaft rotates at a high speed, more oil can be sprayed on the rotor of the driving motor, and the cooling efficiency can be improved.

[0041] In an embodiment, the cooling flow channel can be formed by the outer wall of the oil duct and the inner wall of the rotating shaft, thereby simplifying the forming process of the cooling flow channel.

[0042] In an embodiment, the cooling flow channel and the lubricating flow channel are integrally formed in the motor shaft. In an embodiment, the motor shaft is an integrated structure.

[0043] In an embodiment, the housing of the power assembly comprises a bearing groove for fixing an outer ring of a bearing, an inner ring of the bearing is used for fixing a motor shaft, a groove opening of the bearing groove is directed towards a rotor of the driving motor along an axial direction of the power assembly. The groove bottom of the bearing groove comprises an oil outlet hole, an opening of the oil outlet hole is directed towards the rotor of the driving motor along the axial direction of the power assembly, and the oil outlet hole is used for outputting oil to at least one of the cooling flow channel and the lubricating flow channel.

[0044] In the embodiment, the groove opening of the bearing groove is directed towards the rotor of the driving motor along the axial direction of the power assembly, which is more convenient for fixing the bearing in the bearing groove to the motor shaft.

[0045] In the embodiment, the groove bottom of the bearing groove comprises the oil outlet hole, the opening of the oil outlet hole is directed towards the rotor of the driving motor along the axial direction of the power assembly, so that the oil output by the oil outlet hole can be directly directed towards the rotor of the driving motor, the oil output by the oil outlet hole can flow more smoothly to the rotor of the driving motor, and the oil outlet hole is closer to the rotor of the driving motor, so that the rotor of the driving motor is cooled more quickly by the oil, and the cooling efficiency of the driving motor is improved.

[0046] In the embodiment, the oil outlet hole is used for outputting oil to at least one of the cooling flow channel and the lubricating flow channel, so that the oil output by the oil outlet hole can enter the motor shaft, be divided in the motor shaft, and flow to the cooling flow channel and the lubricating flow channel, the oil flowing to the cooling flow channel can be used for cooling the rotor of the driving motor, and the oil flowing to the lubricating flow channel can be used for lubricating the gear shaft assembly of the speed reducer, so that the operation of the speed reducer is ensured.

[0047] In an embodiment, the same oil outlet hole is used for outputting oil to the cooling flow channel and the lubricating flow channel, so that the oil feeding structure is simplified. In an embodiment, the groove bottom of the bearing groove comprises two oil outlet holes, and the two oil outlet holes are respectively used for outputting oil to the cooling flow channel and the lubricating flow channel, so that the flow of the cooling flow channel and the lubricating flow channel is more accurately controlled, the cooling effect of the rotor of the driving motor is better, the lubricating effect of the speed reducer is better, and the working efficiency of the cooling and lubricating system of the power assembly is improved.

[0048] In an embodiment, the inlet of the cooling flow channel or the lubricating flow channel is embedded in the oil outlet hole. In an embodiment, the oil outlet hole is embedded in the inlet of the cooling flow channel or the lubricating flow channel.

[0049] In an embodiment, the oil outlet hole is spaced apart from the inlet of at least one of the cooling flow channel and the lubricating flow channel along the axial direction of the power assembly, the oil outlet hole is used for fixing a nozzle, and the nozzle is used for outputting the oil output by the oil outlet hole to the cooling flow channel or the lubricating flow channel.

[0050] In the embodiment of the present application, the oil outlet hole is spaced from the inlet of at least one of the cooling flow channel and the lubricating flow channel along the axial direction of the power assembly, so that a space is formed between the oil outlet hole and the cooling flow channel and the lubricating flow channel for arranging the nozzle.

[0051] In the embodiment of the present application, the oil outlet hole is used for fixing the nozzle, and the nozzle is used for conveying the oil output by the oil outlet hole to the cooling flow channel or the lubricating flow channel. By arranging the nozzle at the oil outlet hole, the oil flowing out of the oil outlet hole can be divided by the nozzle and flow to the cooling flow channel or the lubricating flow channel, so that the motor shaft has oil, thereby facilitating cooling of the rotor of the driving motor or lubrication of the speed reducer.

[0052] In one embodiment, the nozzle includes two outlets, and the two outlets of the nozzle respectively supply oil to the cooling flow channel and the lubricating flow channel.

[0053] In one embodiment, the shell is used to enclose the speed reducer shell to form a motor cavity, the motor cavity is used to accommodate the stator and the rotor of the driving motor, the speed reducer shell is used to accommodate the gear shaft assembly of the speed reducer, the speed reducer shell includes a through hole penetrating through the speed reducer shell along the axial direction of the motor shaft, the through hole is used to pass through one end of the motor shaft, the one end of the motor shaft extending into the speed reducer shell through the through hole, and the outlet of the lubricating flow channel is distributed on the one end of the motor shaft, and the one end of the motor shaft is used to drivingly connect at least one gear of the speed reducer.

[0054] In the embodiment of the present application, the shell is used to enclose the speed reducer shell to form a motor cavity, so that the motor cavity can be formed by using the speed reducer shell, and the integration of the shell of the power assembly is higher.

[0055] In the embodiment of the present application, the speed reducer shell includes a through hole penetrating through the speed reducer shell along the axial direction of the motor shaft, so that the one end of the motor shaft extending into the speed reducer shell through the through hole on the speed reducer shell is facilitated. The one end of the motor shaft extending into the speed reducer shell is more conducive to the lubricating flow channel in the motor shaft conveying another route of oil to the gear shaft assembly of the speed reducer for lubrication.

[0056] In the embodiment of the present application, the outlet of the lubricating flow channel is distributed on the one end of the motor shaft, the one end of the motor shaft extending into the speed reducer shell, so that another route of oil in the lubricating flow channel can be directly sprayed in the speed reducer shell. The one end of the motor shaft is used to drivingly connect at least one gear of the speed reducer, so that the outlet of the lubricating flow channel is close to at least one gear of the speed reducer, and another route of oil in the lubricating flow channel is more conveniently sprayed to the gear shaft assembly of the speed reducer, and another route of oil is more accurately conveyed to the gear shaft assembly of the speed reducer for lubrication.

[0057] In an embodiment, the reducer comprises a sun gear, a planet carrier and a plurality of planet gears, one end of the motor shaft is used for driving connection of the sun gear, the plurality of planet gears are distributed along the circumference of the motor shaft and outside the sun gear, the outlet of the lubricating flow channel along the axial direction of the power assembly is exposed to the sun gear, and the other oil output by the outlet of the lubricating flow channel is used for cooling the plurality of planet gears.

[0058] In the embodiment, one end of the motor shaft is used for driving connection of the sun gear, and the plurality of planet gears are distributed along the circumference of the motor shaft and outside the sun gear, so that the power of the driving motor can be transmitted to the sun gear of the reducer through the motor shaft, the sun gear of the reducer is driven to rotate, the sun gear transmits the power to the plurality of planet gears, the plurality of planet gears are also moved, and the output half shaft drives the wheels.

[0059] In the embodiment, the outlet of the lubricating flow channel along the axial direction of the power assembly is exposed to the sun gear, so that the oil flowing out of the outlet of the lubricating flow channel does not hit the shaft cavity of the motor shaft when the motor shaft rotates at a high speed, but can be directly thrown out of the motor shaft, and the other oil in the lubricating flow channel is more convenient for lubricating the sun gear and the plurality of planet gears located in the circumference of the sun gear along the radial direction of the power assembly when the motor shaft rotates.

[0060] In the embodiment, the other oil output by the outlet of the lubricating flow channel is used for cooling the plurality of planet gears, which is beneficial to guarantee the normal operation of the plurality of planet gears.

[0061] In an embodiment, when the length of the outlet of the lubricating flow channel is insufficient to be exposed to the sun gear, a nozzle can be connected to the outlet of the lubricating flow channel to guarantee that the other oil output by the outlet of the lubricating flow channel can be directly sprayed on the gear shaft assembly of the reducer, and the gear shaft assembly of the reducer is fully lubricated.

[0062] In an embodiment, when the reducer comprises two-stage planet gears, the outlet of the lubricating flow channel along the axial direction of the power assembly is distributed between the two-stage planet gears, and the lubricating flow channel lubricates the two-stage planet gears.

[0063] In an embodiment, the power assembly comprises two driving motors and two reducers, the two driving motors are arranged between the two reducers, the power assembly comprises two reducer housings, the housing comprises a partition plate, the partition plate is used for separating the housing into two motor slots, the slots of the two motor slots are opposite along the axial direction of the power assembly, each motor slot is used for enclosing one reducer housing to form a motor cavity, the partition plate comprises two bearing slots, the slots of the two bearing slots are opposite along the axial direction of the power assembly, and the slot bottom of each bearing slot comprises an oil outlet hole. The internal flow channel of the partition plate is used for conveying oil to the oil outlet holes in the slot bottoms of the two bearing slots, and the openings of the oil outlet holes of the two bearing slots are opposite along the axial direction of the power assembly.

[0064] In the embodiment of the present application, the two motor slots are opposite to each other along the axial direction of the power assembly, and each motor slot is used to enclose a reducer housing to form a motor cavity, so that the stator and the rotor of a driving motor can be respectively installed in the motor cavity through the slot openings of the two motor slots.

[0065] In the embodiment of the present application, the two bearing slots are opposite to each other along the axial direction of the power assembly, so that the two bearing slots are exposed in the two motor cavities respectively, and the oil holes in the bottom of each bearing slot can be used to supply oil to the motor shaft in the two motor cavities respectively, so that the oil supplied by the oil holes of the two bearing slots can be branched and flows in parallel, thereby reducing the system oil resistance of the power assembly and reducing the power loss.

[0066] In the embodiment of the present application, the internal flow channel of the partition plate is used to supply oil to the oil holes in the bottom of the two bearing slots, so that the oil in the internal flow channel of the partition plate can be branched through the oil holes in the bottom of the two bearing slots, and the openings of the oil holes of the two bearing slots are opposite to each other along the axial direction of the power assembly, so that the oil output by the oil holes of the two bearing slots can be supplied to the motor shaft in the motor cavities on both sides of the partition plate along the axial direction of the power assembly.

[0067] In one embodiment, the oil holes of the two bearing slots supply oil to the through hole in the oil passage and the slot opening of the annular groove of the motor shaft through the nozzles respectively, so that the oil flowing out of the oil holes of the bearing slots can enter the lubricating flow channel and the cooling flow channel respectively, thereby enabling the oil in the lubricating flow channel and the cooling flow channel to flow relatively independently, which is beneficial to ensure that the oil in the cooling flow channel can cool the rotor of the driving motor, and the oil in the lubricating flow channel can be supplied to the sun gear and the planetary gear of the reducer along the axial direction of the power assembly.

[0068] In a second aspect, the present application provides an electric vehicle, which comprises a frame and a power assembly as in the first aspect, the frame is used to fix the power assembly, and the power assembly is used to drive the wheels through the output half shaft.

[0069] In the embodiment of the present application, the power assembly is arranged with the cooling flow channel and the lubricating flow channel in the motor shaft simultaneously, so that the flow channel for cooling the rotor of the driving motor and the flow channel for lubricating the reducer are two flow channels, thereby ensuring that even in the case of high-speed rotation of the motor shaft, the other oil flowing in the motor shaft can lubricate the reducer through the lubricating flow channel, which is beneficial to ensure the normal operation of the reducer, thereby improving the performance of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0071] Figure 1 is a schematic view of an electric vehicle provided by an embodiment of the present application;

[0072] Figure 2 is a schematic view of a power assembly provided by an embodiment of the present application;

[0073] Figure 3 is another schematic view of a power assembly provided by an embodiment of the present application;

[0074] Figure 4 is a schematic view of a motor shaft provided by an embodiment of the present application;

[0075] Figure 5 is a sectional view of a motor shaft provided by an embodiment of the present application;

[0076] Figure 6 is another schematic view of a power assembly provided by an embodiment of the present application. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0078] The present application provides a housing of a power assembly for fixing a stator of a drive motor and accommodating a rotor of the drive motor, the rotor of the drive motor is fixed to a motor shaft of the drive motor, and the motor shaft of the drive motor is used for transmission connection with an input shaft of a speed reducer. The motor shaft comprises a cooling flow channel and a lubricating flow channel, the cooling flow channel is used for conveying one-way oil to the rotor of the drive motor for cooling, and the lubricating flow channel is used for conveying another-way oil to the speed reducer for lubrication.

[0079] By arranging the cooling flow channel and the lubricating flow channel in the motor shaft at the same time, the flow channel for cooling the rotor of the drive motor and the flow channel for lubricating the speed reducer are two flow channels, so that even in the case of high-speed rotation of the motor shaft, the other-way oil circulating in the motor shaft can pass through the lubricating flow channel to lubricate the speed reducer, which is beneficial to ensure the normal operation of the speed reducer.

[0080] Figure 1 is a schematic view of an electric vehicle 1 provided by an embodiment of the present application.

[0081] In an embodiment, the electric vehicle 1 comprises a vehicle frame 10 and a power assembly 20, as shown in Figure 1 The vehicle frame 10 is used for fixing the power assembly 20. In the embodiments of the present application, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device. In the embodiments of the present application, the power assembly 20 is used for driving the vehicle wheels 30.

[0082] Figure 2 is a schematic diagram of a power assembly 20 provided by an embodiment of the present application, Figure 3 is another schematic diagram of the power assembly 20 provided by an embodiment of the present application.

[0083] In an embodiment, as shown in Figure 2 and Figure 3 , the power assembly 20 comprises a power supply device 100, a driving motor 200 and a reducer 300.

[0084] In an embodiment of the present application, the driving motor 200 comprises a motor shaft 210, a stator 220 and a rotor 230, and the reducer 300 comprises a gear shaft assembly 310. The rotor 230 of the driving motor 200 is fixedly sleeved on the motor shaft 210, and the stator 220 drives the rotor 230 to rotate after receiving the alternating current transmitted by the power supply device 100, thereby driving the motor shaft 210 to rotate. The motor shaft 210 of the driving motor 200 is used to transmit kinetic energy to the gear shaft assembly 310 of the reducer 300, and then transmit power to the wheel 30 through the output half shaft 40 of the reducer 300 to drive the wheel 30 to move.

[0085] In an embodiment, the reducer 300 is a planetary reducer, which comprises a sun gear (not shown), a plurality of planet gears (not shown), a plurality of planet shafts (not shown), a ring gear (not shown) and a planet carrier (not shown), wherein the sun gear is drivingly connected to the motor shaft of the driving motor, the planet carrier is drivingly connected to the output half shaft 40, and the output half shaft 40 is coaxial with the motor shaft 210 of the driving motor 200. In an embodiment, the planetary reducer comprises two stages of planet gears, and the planetary reducer comprises a sun gear, a first stage of planet gears and a second stage of planet gears, wherein the sun gear is drivingly connected to the motor shaft 210 of the driving motor 200, the sun gear is drivingly connected to the output half shaft 40 through the first stage of planet gears and the second stage of planet gears, and the speed is changed through the two stages of planet gears.

[0086] In an embodiment, the reducer 300 is a parallel shaft reducer (not shown), which comprises an input shaft (not shown), an intermediate shaft (not shown) and an output shaft (not shown), wherein the input gear fixed to the input shaft is engaged with the intermediate driven gear fixed to the intermediate shaft, and the intermediate driving gear fixed to the intermediate shaft is engaged with the output gear fixed to the output shaft. In an embodiment, the output gear of the reducer 300 is drivingly connected to the wheel through the differential and the output half shaft.

[0087] Currently, an oil guide pipe and an oil hole are usually formed in the motor shaft of the power assembly for cooling the rotor of the driving motor and lubricating the gear shaft assembly of the reducer. However, when the motor shaft rotates at a high speed, the lubricating oil in the motor shaft is often thrown out of the oil hole halfway, and cannot flow to the other end of the motor shaft to achieve overall cooling and lubrication of the motor shaft, nor can the oil in the motor shaft be transmitted to the gear shaft assembly of the reducer for lubrication.

[0088] The application sets the lubricating flow channel and the cooling flow channel in the motor shaft respectively, so that the flow channel for cooling the rotor of the driving motor and the flow channel for lubricating the reducer are two flow channels, thereby ensuring that even in the case of high-speed rotation of the motor shaft, the other oil liquid circulating in the motor shaft can lubricate the reducer through the lubricating flow channel, which is beneficial to ensure the normal operation of the reducer.

[0089] The power assembly 20 provided by the embodiment of the application will be described in detail below.

[0090] Figure 4 is a schematic view of the motor shaft 210 provided by the embodiment of the application, Figure 5 is a sectional view of the motor shaft 210 provided by the embodiment of the application. Among them, Figure 5 The solid arrow represents one oil liquid 400, and the dashed arrow represents another oil liquid 500.

[0091] In an embodiment, as shown in Figure 3 to Figure 5 The housing 20a of the power assembly 20 is used to fix the stator 220 of the driving motor 200 and accommodate the rotor 230 of the driving motor 200. The rotor 230 of the driving motor 200 is fixed to the motor shaft 210 of the driving motor 200, and the motor shaft 210 of the driving motor 200 is used for transmission connection with the input shaft of the reducer 300. Among them, the motor shaft 210 includes a cooling flow channel 211 and a lubricating flow channel 212. The cooling flow channel 211 is used to deliver one oil liquid 400 to the rotor 230 of the driving motor 200 for cooling. The lubricating flow channel 212 is used to deliver another oil liquid 500 to the reducer 300 for lubrication.

[0092] In the embodiment of the application, the rotor 230 of the driving motor 200 is fixed to the motor shaft 210 of the driving motor 200, and the motor shaft 210 of the driving motor 200 is used for transmission connection with the input shaft of the reducer 300, so that the rotation of the motor shaft 210 of the driving motor 200 can drive the gear shaft assembly 310 of the reducer 300 to rotate, thereby driving the wheel 30.

[0093] In the embodiment of the present application, the motor shaft 210 of the driving motor 200 rotates at high speed in operation, and the driving motor 200 generates a large amount of heat. Therefore, the oil liquid needs to be introduced into the motor shaft 210 of the driving motor 200 to cool and lower the temperature. The cooling flow channel 211 and the lubricating flow channel 212 are arranged in the motor shaft 210 at the same time. The cooling flow channel 211 is used to deliver one-way oil liquid 400 to the rotor 230 of the driving motor 200 to cool. The lubricating flow channel 212 is used to deliver another-way oil liquid 500 to the speed reducer 300 to lubricate. Therefore, the oil liquid input into the motor shaft 210 can be divided into two ways. One-way oil liquid 400 is used to cool the rotor 230 of the driving motor 200, so that the driving motor 200 does not fail due to overheating. Another-way oil liquid 500 is used to lubricate the gear of the speed reducer 300, which is beneficial to reduce the rotating resistance between the gear shaft assembly 310 of the speed reducer 300 and improve the working efficiency of the speed reducer 300. The arrangement of the cooling flow channel 211 and the lubricating flow channel 212 can also make the oil liquid flow through the entire motor shaft 210, so that the oil liquid can be fully cooled and lubricated to the entire motor shaft 210.

[0094] If only the oil hole arranged in the motor shaft 210 is used to deliver the oil liquid to the rotor 230 of the driving motor 200 to cool by oil throwing when the motor shaft 210 rotates, as the rotating speed of the rotor 230 of the driving motor 200 is higher and higher, the oil liquid is almost all thrown out to cool the rotor 230 of the driving motor 200 after passing through the oil hole. Therefore, the oil liquid cannot flow through the entire motor shaft 210, and the speed reducer 300 cannot receive the oil liquid delivered from the motor shaft 210. As a result, the heat generated by the speed reducer 300 increases, the carrying capacity of the speed reducer 300 decreases, and the service life of the speed reducer 300 is shortened. This is not conducive to the normal operation of the speed reducer 300.

[0095] The embodiment of the present application arranges the lubricating flow channel 212 and the cooling flow channel 211 in the motor shaft 210 respectively. Therefore, the flow channel for cooling the rotor 230 of the driving motor 200 and the flow channel for lubricating the speed reducer 300 are two flow channels. Therefore, even if the motor shaft 210 rotates at high speed, the other-way oil liquid flowing in the motor shaft 210 can pass through the lubricating flow channel 212 to lubricate the speed reducer 300, which is beneficial to ensure the normal operation of the speed reducer 300.

[0096] In one embodiment, as shown in Figure 3 and Figure 5 The flow of the other-way oil liquid 500 delivered by the lubricating flow channel 212 is greater than the flow of the one-way oil liquid 400 delivered by the cooling flow channel 211 of the motor shaft 210.

[0097] In the embodiment of the present application, the flow of the other oil 500 transported by the lubricating flow channel 212 is greater than the flow of the oil 400 transported by the cooling flow channel 211 of the motor shaft 210, so that more oil in the motor shaft 210 can be used to lubricate the reducer 300, meet the lubrication requirements of the reducer 300 in a low-temperature environment, and help to ensure the normal operation of the reducer 300 in a low-temperature environment. The smaller flow of the oil 400 in the cooling flow channel 211 can also meet the cooling requirements of the rotor 230 of the driving motor 200 in a low-temperature environment.

[0098] In an embodiment, as shown in Figure 3 and Figure 5 , the path of the other oil 500 flowing through the lubricating flow channel 212 is greater than the path of the oil 400 flowing through the cooling flow channel 211.

[0099] Since the driving motor 200 generates a lot of heat when working, in order to avoid overheating of the driving motor 200, the driving motor 200 needs to be cooled in time. In the embodiment of the present application, the path of the oil 400 flowing through the cooling flow channel 211 is small, so that the cooling flow channel 211 can also be set to be relatively short compared with the lubricating flow channel 212, so that the cooling flow channel 211 is closer to the rotor 230 of the driving motor 200, and it is also more conducive to the oil 400 in the cooling flow channel 211 being sprayed closer to the rotor 230 of the driving motor 200, so that the rotor 230 of the driving motor 200 can be cooled more fully. If the path of the oil 400 sent to the cooling flow channel 211 is designed to be too long, it will take too long for the oil to be transmitted to the rotor 230 of the driving motor 200, which is not conducive to cooling the rotor 230 of the driving motor 200 in time. Therefore, in the present application, the path of the other oil 500 flowing through the lubricating flow channel 212 is greater than the path of the oil 400 flowing through the cooling flow channel 211, so that while meeting the requirement of providing an independent lubricating flow channel 212 for lubricating the reducer 300, it also meets the requirement of cooling the driving motor 200 in time, so that the working efficiency of the driving motor 200 is improved and the working performance of the reducer 300 is better, thereby improving the overall performance of the power assembly 20.

[0100] In an embodiment, as shown in Figure 3 and Figure 5 , the flow of the other oil 500 transported by the lubricating flow channel 212 is greater than the flow of the oil 400 transported by the cooling flow channel 211 of the motor shaft 210, and the path of the other oil 500 flowing through the lubricating flow channel 212 is greater than the path of the oil 400 flowing through the cooling flow channel 211. This makes the working efficiency of the driving motor 200 be improved and the working performance of the reducer 300 be better in a low-temperature environment, thereby improving the overall performance of the power assembly 20.

[0101] In an embodiment, as shown in Figure 5 the opening direction of the inlet 212a and the outlet 212b of the lubricating flow channel 212 is opposite along the axial direction O of the power assembly 20, the opening direction of the inlet 211a of the cooling flow channel 211 is the same as that of the inlet 212a of the lubricating flow channel 212, and the opening direction of the outlet 211b of the cooling flow channel 211 is parallel to the radial direction R of the power assembly 20.

[0102] In an embodiment, as shown in Figure 3 and Figure 5 the opening direction of the inlet 212a and the outlet 212b of the lubricating flow channel 212 is opposite along the axial direction O of the power assembly 20, so that the other oil 500 in the lubricating flow channel 212 in the motor shaft 210 can be directly delivered to the reducer 300 along the axial direction O of the power assembly 20 in a faster and shorter path, lubricating the reducer 300, and facilitating the normal operation of the reducer 300. It is also convenient to process the lubricating flow channel 212 in the motor shaft 210.

[0103] In an embodiment, the opening direction of the inlet 211a of the cooling flow channel 211 is the same as that of the inlet 212a of the lubricating flow channel 212, so that the cooling flow channel 211 and the lubricating flow channel 212 can simultaneously receive oil from the motor shaft 210, ensuring that the oil in the motor shaft 210 is branched, ensuring that oil can flow through the cooling flow channel 211 and the lubricating flow channel 212, so that the rotor 230 of the drive motor 200 can be cooled while the gear shaft assembly 310 of the reducer 300 can also be fully lubricated. Compared with the design that the opening direction of the inlet 211a of the cooling flow channel 211 is different from that of the inlet 212a of the lubricating flow channel 212, the opening direction of the inlet 211a of the cooling flow channel 211 is the same as that of the inlet 212a of the lubricating flow channel 212, which is more conducive to simplifying the flow channel design, so that the cooling flow channel 211 and the lubricating flow channel 212 can receive oil from the same side, and the oil feeding structure design for the cooling flow channel 211 and the lubricating flow channel 212 is more concentrated and simplified.

[0104] In an embodiment, the oil 400 in the cooling flow channel 211 is used to cool the rotor 230 of the drive motor 200, the opening direction of the outlet 211b of the cooling flow channel 211 is parallel to the radial direction R of the power assembly 20, and the opening direction of the outlet 211b of the cooling flow channel 211 is consistent with the direction of the centrifugal force of the motor shaft 210, which is more conducive to the oil 400 in the cooling flow channel 211 being thrown out to the rotor 230 of the drive motor 200 through the high-speed rotation of the motor shaft 210, and cooling the rotor 230 of the drive motor 200.

[0105] In an embodiment, as shown in Figure 5As shown, the inlet 211a of the cooling flow channel 211 surrounds the outer periphery of the inlet 212a of the lubricating flow channel 212, and the inlet 211a of the cooling flow channel 211 is spaced apart from the inlet 212a of the lubricating flow channel 212 along the radial direction R of the power assembly 20.

[0106] In the embodiment of the present application, as shown in Figure 3 and Figure 5 As shown, the inlet 211a of the cooling flow channel 211 surrounds the outer periphery of the inlet 212a of the lubricating flow channel 212, so that the lubricating flow channel 212 can be arranged at a position close to the axis of the motor shaft 210, and the cooling flow channel 211 is arranged close to the outer periphery of the motor shaft 210, so that the oil liquid 400 in the cooling flow channel 211 can be more conveniently flung out of the cooling flow channel 211 by the rotation of the motor shaft 210 for cooling and temperature reduction of the rotor 230 of the driving motor 200.

[0107] In the embodiment of the present application, the inlet 211a of the cooling flow channel 211 is spaced apart from the inlet 212a of the lubricating flow channel 212 along the radial direction R of the power assembly 20, so that the oil liquid 400 in the cooling flow channel 211 and the oil liquid 500 in the lubricating flow channel 212 can flow relatively independently, so as to ensure that the oil liquid 400 in the motor shaft 210 is used for lubricating the speed reducer 300, and the oil liquid 500 is used for cooling and temperature reduction of the rotor 230 of the driving motor 200.

[0108] In one embodiment, the cooling flow channel 211 and the lubricating flow channel 212 can be integrally formed in the motor shaft 210, so that the motor shaft 210 has higher structural strength.

[0109] In one embodiment, the hole diameter of the inlet 212a of the lubricating flow channel 212 along the radial direction R of the power assembly 20 is greater than the width of the inlet 211a of the cooling flow channel 211.

[0110] In the embodiment of the present application, the hole diameter of the inlet 212a of the lubricating flow channel 212 along the radial direction R of the power assembly 20 is greater than the width of the inlet 211a of the cooling flow channel 211, so that the amount of the oil liquid flowing into the lubricating flow channel 212 is greater than the amount of the oil liquid flowing into the cooling flow channel 211, so as to ensure that sufficient oil liquid can be delivered to the speed reducer 300 for lubrication of the speed reducer 300 when the environment is at low temperature, and the normal operation of the speed reducer 300 is facilitated.

[0111] In the embodiment of the present application, the cooling flow channel 211 surrounds the lubricating flow channel 212, and the width of the inlet 211a of the cooling flow channel 211 is small, which is beneficial to maintaining the motor shaft 210 with a relatively thick wall thickness, so that the motor shaft 210 has higher reliability.

[0112] In an embodiment, the inlet 211a of the cooling flow channel 211 surrounds the periphery of the inlet 212a of the lubricating flow channel 212, and the aperture of the inlet 212a of the lubricating flow channel 212 is larger than the width of the inlet 211a of the cooling flow channel 211 along the radial direction R of the power assembly 20. In the embodiment, when the inlet 211a of the cooling flow channel 211 surrounds the periphery of the inlet 212a of the lubricating flow channel 212, the cooling flow channel 211 is annular, so that the flow area of the inlet 211a of the cooling flow channel 211 is larger than the flow area of the inlet 211a of the cooling flow channel 211 when the width of the inlet 211a of the cooling flow channel 211 is smaller than the aperture of the inlet 212a of the lubricating flow channel 212, and thus the lubrication requirement of the reducer 300 can be met under the condition of cooling the driving motor 200.

[0113] In an embodiment, as shown in Figure 5 the inlet 211a and the outlet 211b of the cooling flow channel 211 are arranged along the axial direction O of the power assembly 20, and the interval between the inlet 211a and the outlet 211b of the cooling flow channel 211 is smaller than the interval between the inlet 212a and the outlet 212b of the lubricating flow channel 212.

[0114] In the embodiment, as shown in Figure 3 and Figure 5 the inlet 211a and the outlet 211b of the cooling flow channel 211 are arranged along the axial direction O of the power assembly 20, and the interval between the inlet 211a and the outlet 211b of the cooling flow channel 211 is smaller than the interval between the inlet 212a and the outlet 212b of the lubricating flow channel 212, so that the length of the cooling flow channel 211 along the axial direction O of the power assembly 20 is shorter than the length of the lubricating flow channel 212, which is beneficial to making the oil flow through the cooling flow channel 211 closer to the rotor 230 of the driving motor 200, so that the oil ejected from the outlet 211b of the cooling flow channel 211 can better cover the rotor 230 of the driving motor 200, and the cooling efficiency of the one-way oil 400 on the rotor 230 of the driving motor 200 is improved. The interval between the inlet 212a and the outlet 212b of the lubricating flow channel 212 is large, and a longer lubricating flow channel 212 can be obtained, which is beneficial to delivering the other-way oil 500 through the motor shaft 210 to the reducer 300 arranged at a far end for lubrication, and ensuring the normal operation of the reducer 300.

[0115] In an embodiment, as shown in Figure 3 to Figure 5 the motor shaft 210 further comprises a radial flow channel 213, the inlet 213a of the radial flow channel 213 is used for communicating the cooling flow channel 211, and the outlet 213b of the radial flow channel 213 is parallel to the radial direction R of the power assembly 20, and the radial flow channel 213 is used for transmitting the one-way oil 400 output by the cooling flow channel 211 to the rotor 230 of the driving motor 200.

[0116] In the embodiment of the present application, the motor shaft 210 further comprises a radial flow channel 213, an inlet 213a of the radial flow channel 213 is used to communicate with the cooling flow channel 211, so that the oil liquid 400 in the cooling flow channel 211 can flow out to the rotor 230 of the driving motor 200 through the radial flow channel 213.

[0117] In the embodiment of the present application, the outlet 213b of the radial flow channel 213 is parallel to the radial direction R of the power assembly 20, so that the length of the radial flow channel 213 can be shorter, and it is more conducive to the motor shaft 210 to quickly throw the oil liquid 400 in the cooling flow channel 211 to the rotor 230 of the driving motor 200 through the radial flow channel 213 during high-speed rotation, and improve the cooling efficiency of the rotor 230 of the driving motor 200.

[0118] In one embodiment, as shown in Figure 5 , the motor shaft 210 comprises two radial flow channels 213, and the spacing of the two radial flow channels 213 from the inlet 211a of the cooling flow channel 211 is different along the axial direction O of the power assembly 20.

[0119] In the embodiment of the present application, as shown in Figure 3 and Figure 5 , the motor shaft 210 comprises two radial flow channels 213, and the spacing of the two radial flow channels 213 from the inlet 211a of the cooling flow channel 211 is different along the axial direction O of the power assembly 20, so that the oil liquid 400 in the cooling flow channel 211 can be thrown out at different positions of the motor shaft 210, which is more conducive to the oil liquid 400 that is thrown out to have a larger contact area with the rotor 230 of the driving motor 200, and is conducive to improving the cooling efficiency.

[0120] In the embodiment of the present application, when the rotational speed of the motor shaft 210 of the driving motor 200 is relatively low, the centrifugal force acting on the oil liquid 400 in the cooling flow channel 211 is relatively small, which is easy to cause the oil liquid in the cooling flow channel 211 to flow back to the inlet 211a of the cooling flow channel 211. By arranging a radial flow channel 213 at a position close to the inlet 211a of the cooling flow channel 211, it is conducive to causing the oil liquid to flow through the radial flow channel 213 and flow out to the rotor 230 of the driving motor 200, so as to ensure that the rotor 230 of the driving motor 200 has sufficient oil liquid for cooling.

[0121] In one embodiment, as shown in Figure 5 , the motor shaft 210 comprises a rotating shaft 214 and an oil passage 215, the rotating shaft 214 comprises a shaft cavity 2140, the shaft cavity 2140 penetrates the motor shaft 210 along the axial direction O of the power assembly 20, and the shaft cavity 2140 is used to accommodate and fix the oil passage 215. The oil passage 215 comprises a through hole 2510, the through hole 2510 penetrates the oil passage 215 along the axial direction O of the power assembly 20, and the through hole 2510 is used to constitute the lubricating flow channel 212.

[0122] In the embodiment of the present application, as shown in Figure 3 and Figure 5 The motor shaft 210 comprises a rotating shaft 214 and an oil pipe 215. The rotating shaft 214 comprises a shaft cavity 2140. The shaft cavity 2140 penetrates the motor shaft 210 along the axial direction O of the power assembly 20, so that the oil pipe 215 can be arranged in the shaft cavity 2140 of the rotating shaft 214. Dividing the motor shaft 210 into the rotating shaft 214 and the oil pipe 215 is also conducive to facilitating the processing of the lubricating flow channel 212 and simplifying the processing process.

[0123] In the embodiment of the present application, the through hole 2510 of the oil pipe 215 penetrates the oil pipe 215 along the axial direction O of the power assembly 20. The through hole 2510 is directly machined in the oil pipe 215 to form the lubricating flow channel 212. The lubricating flow channel 212 can also be parallel to the axial direction O of the power assembly 20. Therefore, another oil liquid 500 in the lubricating flow channel 212 can be transmitted to the reducer 300 on the side of the driving motor 200 at a faster speed and a shorter distance, so as to lubricate the gear shaft assembly 310 of the reducer 300, which is conducive to ensuring the normal operation of the reducer 300.

[0124] In an embodiment, as shown in Figure 5 The oil pipe 215 further comprises an annular groove 2151. The annular groove 2151 is recessed from the end face of one end 2153 of the oil pipe 215 towards the other end 2154 of the oil pipe 215 along the axial direction O of the power assembly 20. The annular groove 2151 surrounds the through hole 2510. The annular groove 2151 is used to constitute the cooling flow channel 211. The groove opening 2152 of the annular groove 2151 is the inlet 211a of the cooling flow channel 211. The groove wall 2155 of the annular groove 2151 comprises a communication hole 2156. The communication hole 2156 penetrates the groove wall 2155 of the annular groove 2151 along the radial direction R of the power assembly 20. The communication hole 2156 is the outlet 211b of the cooling flow channel 211.

[0125] In the embodiment of the present application, the oil pipe 215 further comprises an annular groove 2151. The annular groove 2151 is recessed from the end face of one end 2153 of the oil pipe 215 towards the other end 2154 of the oil pipe 215 along the axial direction O of the power assembly 20. Therefore, the annular groove 2151 is machined from one end 2153 of the oil pipe 215, or the annular groove 2151 is demolded from the other end 2154 of the oil pipe 215.

[0126] In the embodiment of the present application, as shown in Figure 3 and Figure 5As shown, the annular groove 2151 surrounds the through hole 2510, and the annular groove 2151 is used to form the cooling flow channel 211, so that the cooling flow channel 211 can be arranged around the outer periphery of the lubricating flow channel 212 in the through hole 2510, and the cooling flow channel 211 in the annular groove 2151 and the lubricating flow channel 212 in the through hole 2510 can respectively and independently transport oil, and further, one oil 400 input into the oil pipe 215 can be used to cool the rotor 230 of the driving motor 200, so as to avoid overheating of the driving motor 200 and failure, and another oil 500 can be used to lubricate the speed reducer 300, which is beneficial to normal operation of the speed reducer 300.

[0127] In the embodiment of the present application, the notch 2152 of the annular groove 2151 is the inlet 211a of the cooling flow channel 211, so that one oil 400 can flow into the cooling flow channel 211 through the notch 2152 of the annular groove 2151, the groove wall 2155 of the annular groove 2151 includes a communication hole 2156, the communication hole 2156 penetrates the groove wall 2155 of the annular groove 2151 along the radial direction R of the power assembly 20, and the communication hole 2156 is the outlet 211b of the cooling flow channel 211, so that one oil 400 in the cooling flow channel 211 can be guided out of the annular groove 2151 through the communication hole 2156 in the groove wall 2155 of the annular groove 2151, and the rotor 230 of the driving motor 200 is cooled and cooled.

[0128] In the embodiment of the present application, the communication hole 2156 penetrates the groove wall 2155 of the annular groove 2151 along the radial direction R of the power assembly 20, and the communication hole 2156 can be directly machined from the oil pipe 215 along the radial direction R of the power assembly 20, so that the communication hole 2156 has a shorter length, and the oil can be sprayed along the radial direction R of the power assembly 20 at a faster speed when the motor shaft 210 rotates at a high speed. The oil can be sprayed along the radial direction R of the power assembly 20, so that more oil can be sprayed on the rotor 230 of the driving motor 200, which is beneficial to improve the cooling efficiency.

[0129] In one embodiment, the cooling flow channel 211 can be formed by the outer wall of the oil pipe 215 and the inner wall of the rotating shaft 214, which simplifies the forming process of the cooling flow channel 211.

[0130] In one embodiment, the cooling flow channel 211 and the lubricating flow channel 212 are integrally formed in the motor shaft 210. In one embodiment, the motor shaft 210 is an integrated structure.

[0131] In one embodiment, as Figure 3 and Figure 5As shown, the housing 20a of the power assembly 20 includes a bearing groove 610 for fixing an outer ring of a bearing 800, an inner ring of the bearing 800 is used for fixing the motor shaft 210, a groove opening 611 of the bearing groove 610 is directed to the rotor 230 of the driving motor 200 along the axial direction O of the power assembly 20. Wherein, a groove bottom 612 of the bearing groove 610 includes an oil outlet hole 613, an opening of the oil outlet hole 613 is directed to the rotor 230 of the driving motor 200 along the axial direction O of the power assembly 20, and the oil outlet hole 613 is used for outputting oil to at least one of the cooling flow channel 211 and the lubricating flow channel 212.

[0132] In the embodiment of the present application, the groove opening 611 of the bearing groove 610 is directed to the rotor 230 of the driving motor 200 along the axial direction O of the power assembly 20, which is more convenient for fixing the bearing 800 in the bearing groove 610 to the motor shaft 210.

[0133] In the embodiment of the present application, the groove bottom 612 of the bearing groove 610 includes the oil outlet hole 613, and the opening of the oil outlet hole 613 is directed to the rotor 230 of the driving motor 200 along the axial direction O of the power assembly 20, so that the oil output by the oil outlet hole 613 can be directly directed to the rotor 230 of the driving motor 200, so that the oil output by the oil outlet hole 613 can flow more smoothly to the rotor 230 of the driving motor 200, and the oil outlet hole 613 is also closer to the rotor 230 of the driving motor 200, so that the rotor 230 of the driving motor 200 can be cooled and cooled more quickly by the oil, and the cooling efficiency of the driving motor 200 can be improved.

[0134] In the embodiment of the present application, the oil outlet hole 613 is used for outputting oil to at least one of the cooling flow channel 211 and the lubricating flow channel 212, so that the oil output by the oil outlet hole 613 can enter the motor shaft 210 and be divided in the motor shaft 210, one way of the oil 400 flowing to the cooling flow channel 211 can be used to cool and cool the rotor 230 of the driving motor 200, and the other way of the oil 500 flowing to the lubricating flow channel 212 can be used to lubricate the gear shaft assembly 310 of the speed reducer 300, so as to ensure the normal operation of the speed reducer 300.

[0135] In one embodiment, the same oil outlet hole 613 is used to deliver oil to the cooling flow channel 211 and the lubricating flow channel 212, so that the oil delivery structure is simplified. In one embodiment, the groove bottom 612 of the bearing groove 610 includes two oil outlet holes 613, and the two oil outlet holes 613 respectively deliver oil to the cooling flow channel 211 and the lubricating flow channel 212, so that the flow of the cooling flow channel 211 and the lubricating flow channel 212 can be more accurately controlled, and the cooling and cooling effect of the rotor 230 of the driving motor 200 and the lubrication effect of the speed reducer 300 can be better, and the working efficiency of the cooling and lubricating system of the power assembly 20 can be improved.

[0136] In an embodiment, the inlet of the cooling flow channel 211 or the lubricating flow channel 212 is embedded in the oil outlet hole 613. In an embodiment, the oil outlet hole 613 is embedded in the inlet of the cooling flow channel 211 or the lubricating flow channel 212. In an embodiment, the inlet of the cooling flow channel 211 or the lubricating flow channel 212 is rotatable relative to the oil outlet hole 613, so as to avoid the oil outlet hole 613 affecting the rotation of the motor shaft 210.

[0137] In an embodiment, as shown in Figure 3 and Figure 5 In an embodiment, the oil outlet hole 613 is spaced apart from the inlet 211a, 212a of at least one of the cooling flow channel 211 and the lubricating flow channel 212 along the axial direction O of the power assembly 20, and the oil outlet hole 613 is used to fix the nozzle 700, and the nozzle 700 is used to deliver the oil output by the oil outlet hole 613 to the cooling flow channel 211 or the lubricating flow channel 212.

[0138] In an embodiment, the oil outlet hole 613 is spaced apart from the inlet 211a, 212a of at least one of the cooling flow channel 211 and the lubricating flow channel 212 along the axial direction O of the power assembly 20, so that the oil outlet hole 613 and the cooling flow channel 211 and the lubricating flow channel 212 have space for arranging the nozzle 700.

[0139] In an embodiment, the oil outlet hole 613 is used to fix the nozzle 700, and the nozzle 700 is used to deliver the oil output by the oil outlet hole 613 to the cooling flow channel 211 or the lubricating flow channel 212. By arranging the nozzle 700 on the oil outlet hole 613, the oil flowing out of the oil outlet hole 613 can be divided by the nozzle 700 and flow to the cooling flow channel 211 or the lubricating flow channel 212 respectively, so that the motor shaft 210 has oil therein, thereby facilitating cooling of the rotor 230 of the driving motor 200 or lubrication of the speed reducer 300.

[0140] In an embodiment, the nozzle 700 includes two outlets, and the two outlets of the nozzle 700 respectively deliver oil to the cooling flow channel 211 and the lubricating flow channel 212.

[0141] In an embodiment, as shown in Figure 3 and Figure 5As shown, the housing 20a is used to enclose the reducer housing 320 to form the motor cavity 240, the motor cavity 240 is used to accommodate the stator 220 and the rotor 230 of the driving motor 200, the reducer housing 320 is used to accommodate the gear shaft assembly 310 of the reducer 300, the reducer housing 320 comprises a through hole 321, the through hole 321 penetrates the reducer housing 320 along the axial direction O of the motor shaft 210, the through hole 321 is used to pass through one end 216 of the motor shaft 210, the one end 216 of the motor shaft 210 extending into the reducer housing 320 through the through hole 321, the outlet 212b of the lubricating flow channel 212 is distributed on the one end 216 of the motor shaft 210, and the one end 216 of the motor shaft 210 is used to drive connection at least one gear of the reducer 300.

[0142] In the embodiment of the present application, the housing 20a is used to enclose the reducer housing 320 to form the motor cavity 240, so that the formation of the motor cavity 240 can be borrowed from the reducer housing 320, which is beneficial to make the integration of the housing 20a of the power assembly 20 higher.

[0143] In the embodiment of the present application, the reducer housing 320 comprises a through hole 321, the through hole 321 penetrates the reducer housing 320 along the axial direction O of the motor shaft 210, thereby creating conditions for the one end 216 of the motor shaft 210 to extend into the reducer housing 320 through the through hole 321 on the reducer housing 320. The one end 216 of the motor shaft 210 extending into the reducer housing 320 is more beneficial to the lubricating flow channel 212 in the motor shaft 210 to deliver another oil 500 to the gear shaft assembly 310 of the reducer 300 for lubrication.

[0144] In the embodiment of the present application, the outlet 212b of the lubricating flow channel 212 is distributed on the one end 216 of the motor shaft 210, and the one end 216 of the motor shaft 210 extends into the reducer housing 320, so that another oil 500 in the lubricating flow channel 212 can be directly sprayed in the reducer housing 320. And the one end 216 of the motor shaft 210 is used to drive connection at least one gear of the reducer 300, so that the outlet 212b of the lubricating flow channel 212 is close to at least one gear of the reducer 300, which is more convenient to spray another oil 500 in the lubricating flow channel 212 to the gear shaft assembly 310 of the reducer 300, and more accurately deliver another oil 500 to the gear shaft assembly 310 of the reducer 300 for lubrication.

[0145] Wherein, the axial direction O of the motor shaft 210 is same as the axial direction O of the power assembly 20.

[0146] In one embodiment, as Figure 3 and Figure 5As shown, the reducer 300 comprises a sun gear 311, a planet carrier 312 and a plurality of planet gears 313, one end 216 of the motor shaft 210 is used for driving connection of the sun gear 311, the plurality of planet gears 313 are distributed on the outer periphery of the sun gear 311 along the circumferential direction C of the motor shaft 210, the outlet 212b of the lubricating flow channel 212 exposed to the sun gear 311 along the axial direction O of the power assembly 20, the other oil 500 output from the outlet 212b of the lubricating flow channel 212 is used for cooling the plurality of planet gears 313.

[0147] In the embodiment of the present application, one end 216 of the motor shaft 210 is used for driving connection of the sun gear 311, the plurality of planet gears 313 are distributed on the outer periphery of the sun gear 311 along the circumferential direction C of the motor shaft 210, so that the power of the driving motor 200 can be transmitted to the sun gear 311 of the reducer 300 through the motor shaft 210, the sun gear 311 of the reducer 300 is driven to rotate, the sun gear 311 transmits the power to the plurality of planet gears 313, so that the plurality of planet gears 313 also move, and then drive the output half shaft 40 to drive the wheel 30.

[0148] In the embodiment of the present application, the outlet 212b of the lubricating flow channel 212 exposed to the sun gear 311 along the axial direction O of the power assembly 20, so that the oil flowing out of the outlet 212b of the lubricating flow channel 212 does not hit the shaft cavity 2140 of the motor shaft 210 when the motor shaft 210 rotates at high speed, but can be directly thrown out of the motor shaft 210, and the other oil 500 in the lubricating flow channel 212 can more conveniently lubricate the sun gear 311 and the plurality of planet gears 313 located in the circumferential direction of the sun gear 311 along the radial direction R of the power assembly 10 when the motor shaft 210 rotates.

[0149] In the embodiment of the present application, the other oil 500 output from the outlet 212b of the lubricating flow channel 212 is used for cooling the plurality of planet gears 313, which is beneficial to ensure the normal operation of the plurality of planet gears 313.

[0150] In one embodiment, when the length of the outlet 212b of the lubricating flow channel 212 is insufficient to be exposed to the sun gear 311, a nozzle can be connected to the outlet 212b of the lubricating flow channel 212 to ensure that the other oil 500 output from the outlet 212b of the lubricating flow channel 212 can be directly sprayed on the gear shaft assembly 310 of the reducer 300, and the gear shaft assembly 310 of the reducer 300 is fully lubricated.

[0151] In one embodiment, when the reducer 300 comprises two-stage planet gears, the outlet 212b of the lubricating flow channel 212 is distributed between the two-stage planet gears along the axial direction O of the power assembly 20, and the lubricating flow channel 212 lubricates the two-stage planet gears.

[0152] Figure 6FIG. 2 is another schematic view of the power assembly 20 provided in the embodiments of the present application.

[0153] In one embodiment, as shown in FIG. 1, the power assembly 20 includes two driving motors 200 and two reducers 300, the two driving motors 200 are arranged between the two reducers 300, the power assembly 20 includes two reducer housings 320, the housing 20a includes a partition plate 600, the partition plate 600 is used to separate the housing 20a into two motor slots 250, the slot openings of the two motor slots 250 are opposite along the axial direction O of the power assembly 20, each motor slot 250 is used to enclose a reducer housing 320 to form a motor cavity 240, the partition plate 600 includes two bearing slots 610, the slot openings 611 of the two bearing slots 610 are opposite along the axial direction O of the power assembly 20, and the slot bottoms 612 of each bearing slot 610 include oil outlet holes 613. Figure 5 Figure 6 The power assembly 20 includes two driving motors 200 and two reducers 300, the two driving motors 200 are arranged between the two reducers 300, the power assembly 20 includes two reducer housings 320, the housing 20a includes a partition plate 600, the partition plate 600 is used to separate the housing 20a into two motor slots 250, the slot openings of the two motor slots 250 are opposite along the axial direction O of the power assembly 20, each motor slot 250 is used to enclose a reducer housing 320 to form a motor cavity 240, the partition plate 600 includes two bearing slots 610, the slot openings 611 of the two bearing slots 610 are opposite along the axial direction O of the power assembly 20, and the slot bottoms 612 of each bearing slot 610 include oil outlet holes 613.

[0154] In the embodiments of the present application, the slot openings of the two motor slots 250 are opposite along the axial direction O of the power assembly 20, and each motor slot 250 is used to enclose a reducer housing 320 to form a motor cavity 240, which facilitates the installation of the stator 220 and the rotor 230 of one driving motor 200 into the motor cavity 240 from the slot openings of the two motor slots 250, respectively.

[0155] In the embodiments of the present application, the partition plate 600 includes two bearing slots 610, the slot openings 611 of the two bearing slots 610 are opposite along the axial direction O of the power assembly 20, so that the two bearing slots 610 are exposed in the two motor cavities 240, respectively, thereby being able to be fixed with the motor shafts 210 in the two motor cavities 240, respectively, and the slot bottoms 612 of each bearing slot 610 include oil outlet holes 613, so that the oil received by the oil outlet holes 613 of the two bearing slots 610 can be delivered to the motor shafts 210 in the two motor cavities 240, respectively, so that the oil is branched and flows in parallel, which can reduce the system oil resistance of the power assembly 20 and reduce power loss.

[0156] In the embodiments of the present application, the internal flow channel of the partition plate 600 is used to deliver oil to the oil outlet holes 613 in the slot bottoms 612 of the two bearing slots 610, so that the oil in the internal flow channel 620 of the partition plate 600 can be branched through the oil outlet holes 613 of the slot bottoms 612 of the two bearing slots 610, and the openings of the oil outlet holes 613 of the two bearing slots 610 are opposite along the axial direction O of the power assembly 20, which facilitates the delivery of the oil output by the oil outlet holes 613 of the two bearing slots 610 to the motor shafts 210 in the motor cavities 240 on both sides of the partition plate 600 along the axial direction O of the power assembly 20, respectively.​

[0157] In an embodiment, as shown in Figure 5 and Figure 6 the oil outlet holes 613 of the two bearing grooves 610 respectively deliver oil to the through hole 2510 in the oil duct 215 of the motor shaft 210 and the notch 2152 of the annular groove 2151 through the nozzles 700, so that the oil flowing out of the oil outlet holes 613 of the bearing grooves 610 can respectively enter the lubricating flow channel 212 and the cooling flow channel 211, thereby enabling the oil in the lubricating flow channel 212 and the cooling flow channel 211 to flow relatively independently, which is conducive to ensuring that the one-way oil 400 in the cooling flow channel 211 can perform oil throwing cooling on the rotor 230 of the driving motor 200, while the other-way oil 500 in the lubricating flow channel 212 can be delivered to the pinion shaft assembly 310 of the reducer 300 along the axial direction O of the power assembly 20 to cool and lubricate the sun gear 311 and the planetary gear 313 of the reducer 300.

[0158] In an embodiment, the nozzles 700 can include a plurality of sub-nozzles 710, the aperture of the sub-nozzles 710 for delivering the other-way oil 500 to the lubricating flow channel 212 is larger than the aperture of the sub-nozzles 710 for delivering the one-way oil 400 to the cooling flow channel 211, which can enable more oil output by the oil outlet holes 613 of the bearing grooves 610 to flow to the reducer 300, thereby sufficiently lubricating the pinion shaft assembly 310 of the reducer 300 and facilitating normal operation of the reducer 300.

[0159] The power assembly and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples in this paper, and the above embodiment descriptions are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, the specific embodiments and application range will be changed according to the idea of the present application, and the above description should not be understood as a limitation of the present application.

Claims

1. A powertrain, characterized by, The housing of the power assembly is used to fix a stator of a driving motor and accommodate a rotor of the driving motor, the rotor of the driving motor is fixed to a motor shaft of the driving motor, the motor shaft of the driving motor is used to be in transmission connection with an input shaft of a speed reducer, wherein: The motor shaft comprises a cooling flow channel and a lubricating flow channel, the cooling flow channel is used to deliver one-way oil to the rotor of the driving motor for cooling, and the lubricating flow channel is used to deliver another-way oil to the speed reducer for lubrication.

2. The powertrain of claim 1, wherein, The flow of the another-way oil delivered by the lubricating flow channel is greater than the flow of the one-way oil delivered by the cooling flow channel of the motor shaft; and / or The path of the another-way oil flowing through the lubricating flow channel is greater than the path of the another-way oil flowing through the cooling flow channel.

3. The powertrain of claim 1 or 2, wherein, The openings of the inlet and outlet of the lubricating flow channel are opposite along the axial direction of the power assembly, the opening direction of the inlet of the cooling flow channel is the same as the opening direction of the inlet of the lubricating flow channel, and the opening direction of the outlet of the cooling flow channel is parallel to the radial direction of the power assembly.

4. The powertrain of claim 3, wherein, The inlet of the cooling flow channel surrounds the outer periphery of the inlet of the lubricating flow channel, and the inlet of the cooling flow channel is spaced from the inlet of the lubricating flow channel along the radial direction of the power assembly.

5. The powertrain of claim 3, wherein, Along the axial direction of the power assembly, the spacing between the inlet and outlet of the cooling flow channel is smaller than the spacing between the inlet and outlet of the lubricating flow channel.

6. The powertrain of any one of claims 1-5, wherein, The motor shaft further comprises a radial flow channel, the inlet of the radial flow channel is used to communicate with the cooling flow channel, the outlet of the radial flow channel is parallel to the radial direction of the power assembly, and the radial flow channel is used to transmit the one-way oil output by the cooling flow channel to the rotor of the driving motor.

7. The powertrain of claim 6, wherein, The motor shaft comprises two radial flow channels, and the spacing between the two radial flow channels and the inlet of the cooling flow channel is different along the axial direction of the power assembly.

8. The powertrain of any one of claims 1-7, wherein, The motor shaft comprises a rotating shaft and an oil pipe, the rotating shaft comprises a shaft cavity, the shaft cavity penetrates through the motor shaft along the axial direction of the power assembly, the shaft cavity is used to accommodate and fix the oil pipe, the oil pipe comprises a through hole, the through hole penetrates through the oil pipe along the axial direction of the power assembly, and the through hole is used to constitute the lubricating flow channel.

9. The powertrain of claim 8, wherein, The oil pipe further comprises an annular groove, the annular groove is recessed from the end face of one end of the oil pipe to the other end of the oil pipe along the axial direction of the power assembly, the annular groove surrounds the through hole, the annular groove is used to constitute the cooling flow channel, the annular groove is provided with a groove opening as the inlet of the cooling flow channel, and the annular groove is provided with a groove wall comprising a communication hole penetrating through the groove wall along the radial direction of the power assembly, and the communication hole is used as the outlet of the cooling flow channel.

10. The powertrain of any one of claims 1-9, wherein, The housing of the power assembly comprises a bearing groove, the bearing groove is used to fix the outer ring of a bearing, the inner ring of the bearing is used to be fixed to the motor shaft, and the groove opening of the bearing groove is directed to the rotor of the driving motor along the axial direction of the power assembly, wherein: The bottom of the bearing groove comprises an oil outlet hole, the opening of the oil outlet hole is directed towards the rotor of the driving motor along the axial direction of the power assembly, and the oil outlet hole is used to output oil to at least one of the cooling flow channel and the lubricating flow channel.

11. The powertrain of claim 10, wherein, The oil outlet hole is spaced from the inlet of at least one of the cooling flow channel and the lubricating flow channel along the axial direction of the power assembly, and the oil outlet hole is used to fix a nozzle for delivering the oil output by the oil outlet hole to the cooling flow channel or the lubricating flow channel.

12. The powertrain of claim 10, wherein, The shell is used to enclose a reducer shell to form a motor cavity for accommodating the stator and the rotor of the driving motor, the reducer shell is used to accommodate the gear shaft assembly of the reducer, the reducer shell comprises a through hole penetrating through the reducer shell along the axial direction of the motor shaft, the through hole is used to pass through one end of the motor shaft, the motor shaft extends into the reducer shell through the one end of the through hole, and the outlet of the lubricating flow channel is distributed on the one end of the motor shaft, and the one end of the motor shaft is used to drivingly connect at least one gear of the reducer.

13. The powertrain of claim 12, wherein, The reducer comprises a sun gear, a planet carrier and a plurality of planet gears, the one end of the motor shaft is used to drivingly connect the sun gear, the plurality of planet gears are distributed on the outer periphery of the sun gear along the circumferential direction of the motor shaft, and the outlet of the lubricating flow channel is exposed to the sun gear along the axial direction of the power assembly, and the other oil output by the outlet of the lubricating flow channel is used to cool the plurality of planet gears.

14. The powertrain of claim 12, wherein, The power assembly comprises two driving motors and two reducers, the two driving motors are arranged between the two reducers, the power assembly comprises two reducer shells, the shell comprises a partition plate, the partition plate is used to separate the shell into two motor grooves, the grooves of the two motor grooves are opposite along the axial direction of the power assembly, each motor groove is used to enclose one reducer shell to form one motor cavity, the partition plate comprises two bearing grooves, the grooves of the two bearing grooves are opposite along the axial direction of the power assembly, and the bottom of each bearing groove comprises the oil outlet hole. The internal flow channel of the partition plate is used to deliver oil to the oil outlet holes in the bottoms of the two bearing grooves, and the openings of the oil outlet holes of the two bearing grooves are opposite along the axial direction of the power assembly.

15. An electric vehicle, characterized by The electric vehicle comprises a frame and the power assembly according to any one of claims 1-14, the frame is used to fix the power assembly, and the power assembly is used to drive the wheels through the output half shafts.

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