Power assembly and electric vehicle

Abstract

The invention provides a power assembly and an electric vehicle, a shell of the power assembly comprises a motor groove and a speed reducer groove, the shell further comprises a plurality of internal flow channels and a plurality of liquid outlets, the plurality of internal flow channels comprise a first internal flow channel and a second internal flow channel, and the plurality of liquid outlets comprise a first liquid outlet and a second liquid outlet. A heat exchanger in the power assembly conveys cooling liquid to first liquid outlets through a first internal flow channel, the first liquid outlets are distributed in the inner side of the groove wall of a motor groove, and the first liquid outlets are used for outputting the cooling liquid to cool a stator of a driving motor. A heat exchanger in the power assembly conveys cooling liquid to second liquid outlets through a second internal flow channel, and the second liquid outlets are distributed in the inner side of the groove wall of the speed reducer groove and used for outputting the cooling liquid to lubricate one or more bearings of the speed reducer. The cooling liquid output from the heat exchanger and conveyed to the second liquid outlet through the second internal flow channel can directly and rapidly lubricate the bearing of the speed reducer actively, and the active lubricating efficiency of the bearing of the speed reducer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a powertrain and an electric vehicle. Background Art

[0002] The powertrain usually includes a drive motor, a motor controller, and a reducer. In order to achieve cooling and lubrication of the powertrain, it is usually necessary to arrange an oil circuit in the powertrain to cool the stator and rotor and lubricate the entire shaft system. The current powertrain structural design makes the reducer bearings mostly passive oil collection and lubrication structures or the coolant has a long path to reach the reducer bearings, and the active lubrication efficiency of the reducer bearings is low. Summary of the invention

[0003] The present application provides a powertrain and an electric vehicle for improving the active lubrication efficiency of one or more bearings of a reducer.

[0004] In the first aspect, the present application provides a powertrain, wherein the housing of the powertrain includes a motor slot and a reducer slot, wherein the slot orientation of the motor slot and the slot orientation of the reducer slot are opposite to each other along the axial direction of the powertrain, wherein the motor slot is used to fix and accommodate the stator of the drive motor in the powertrain, and the reducer slot is used to accommodate multiple bearings of the reducer in the powertrain, and the housing also includes multiple internal flow channels and multiple liquid outlets, wherein the multiple internal flow channels include a first internal flow channel and a second internal flow channel, and the multiple liquid outlets include a first liquid outlet and a second liquid outlet. Among them, the heat exchanger in the powertrain delivers coolant to the first liquid outlet through the first internal flow channel, and the first liquid outlet is distributed on the inner side of the slot wall of the motor slot, and the first liquid outlet is used to output coolant to cool the stator of the drive motor. The heat exchanger in the powertrain delivers coolant to the second liquid outlet through the second internal flow channel, and the second liquid outlet is distributed on the inner side of the slot wall of the reducer slot, and the second liquid outlet is used to output coolant to lubricate one or more bearings of the reducer.

[0005] In an embodiment of the present application, a heat exchanger in a powertrain delivers coolant to a first liquid outlet through a first internal flow channel in a shell. The first liquid outlet is distributed on the inner side of a slot wall of a motor slot. The first liquid outlet is used to output coolant to cool the stator of a drive motor, so that the coolant output by the heat exchanger can actively lubricate the drive motor, and the coolant in the heat exchanger after cooling can cool the stator of the drive motor.

[0006] In the embodiment of the present application, the heat exchanger in the powertrain delivers coolant to the second liquid outlet through the second internal flow channel, and the second liquid outlet is distributed on the inner side of the groove wall of the reducer groove, so that the coolant output by the heat exchanger can be directly output to one or more bearings of the reducer through the second liquid outlet, so that the coolant output by the heat exchanger can be quickly delivered to the bearings of the reducer, and the effective active lubrication of the bearings of the reducer is achieved. Under low temperature conditions, the heat exchanger can also heat the coolant, so that the viscosity of the coolant with a smaller viscosity after heating is reduced, and then it can be quickly delivered to the bearings of the reducer for bearing lubrication, thereby reducing the working resistance of the bearings of the reducer, achieving effective lubrication of the bearings of the reducer, and thus improving the low-temperature driving efficiency of the powertrain.

[0007] In an embodiment of the present application, the heat exchanger actively delivers coolant to the second liquid outlet on the inner side of the groove wall of the reducer groove of the shell through the second internal flow channel of the shell, so that the second internal flow channel for delivering coolant and the actively lubricated bearing are distributed in the same shell, thereby making the delivery path of the coolant for actively lubricating one or more bearings in the reducer groove shorter, and is also conducive to increasing the flow rate of the coolant for actively lubricating one or more bearings in the reducer groove, thereby improving the cooling effect on one or more bearings in the reducer groove. Compared with passive oil collection and lubrication of the bearings in the reducer groove through the internal flow channel in the reducer shell, in an embodiment of the present application, actively delivering oil to the bearings in the reducer groove through the second internal flow channel in the same shell can improve the lubrication effect on the bearings.

[0008] In an embodiment of the present application, multiple internal flow channels and multiple liquid outlets are formed in the shell, the first internal flow channel is used to transport coolant to the stator of the drive motor for active cooling and cooling, and the second internal flow channel is used to transport coolant to the bearings of the reducer for active lubrication. The first internal flow channel and the second internal flow channel separately transport coolant, so that the coolant for active cooling of the stator of the drive motor and the coolant for active lubrication of the bearings of the reducer can be transported independently, and the second liquid outlet is distributed on the inner side of the groove wall of the reducer groove, so that the coolant output from the heat exchanger and transported to the second liquid outlet through the second internal flow channel can directly and quickly actively lubricate the bearings of the reducer groove, which is beneficial to increase the flow rate of coolant for active lubrication of the bearings of the reducer and improve the active lubrication efficiency of the coolant for the bearings of the reducer.

[0009] In one embodiment, the distance between the coolant flowing through the heat exchanger and the second liquid outlet is smaller than the distance between the coolant flowing through the heat exchanger and the first liquid outlet. The aperture of the second liquid outlet is smaller than the aperture of the first liquid outlet.

[0010] In the embodiment of the present application, the distance between the coolant flowing through the heat exchanger and the second outlet is small, so that the coolant output by the heat exchanger can be quickly output from the second outlet to effectively and actively lubricate the bearing of the reducer. The distance between the coolant flowing through the heat exchanger and the first outlet is large, so that the coolant from the heat exchanger can cool down other components in the housing before reaching the first outlet, thereby improving the cooling efficiency of the powertrain.

[0011] In the embodiment of the present application, the aperture of the second liquid outlet is smaller than that of the first liquid outlet, and the distance between the coolant flowing through the heat exchanger and the second liquid outlet is smaller, so that the flow resistance of the coolant is also smaller. If the aperture of the second liquid outlet is set larger, the flow resistance of the coolant will be further reduced, so that more coolant output by the heat exchanger flows from the second internal flow channel to the second liquid outlet, resulting in a smaller amount of coolant delivered to the first liquid outlet through the first internal flow channel, which is not conducive to the cooling and lubrication of the drive motor. If the aperture of the first liquid outlet is set larger, it is beneficial for the coolant in the first internal flow channel to be output more quickly to the stator of the drive motor for cooling and lubrication of the drive motor.

[0012] Therefore, the distance between the coolant flowing through the heat exchanger and the second liquid outlet is smaller than the distance between the coolant flowing through the heat exchanger and the first liquid outlet, and the aperture of the second liquid outlet is smaller than the aperture of the first liquid outlet, which can improve the cooling and lubrication effect of the reducer and drive motor in the powertrain.

[0013] In one embodiment, the housing further comprises an oil pump groove and a heat exchanger mounting surface, the oil pump groove is used to accommodate the oil pump and is used to connect to the reducer groove, the groove opening of the oil pump groove is oriented opposite to the groove opening of the reducer groove along the axial direction of the powertrain, the heat exchanger mounting surface is used to fix the heat exchanger, the groove wall of the reducer groove comprises an output shaft bearing groove, and the output shaft bearing groove is used to fix the outer ring of the output shaft bearing. The oil pump groove and the heat exchanger mounting surface are distributed on the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove. The oil pump groove and the heat exchanger mounting surface are arranged on the same side of the line between the axis of the motor groove and the axis of the output shaft bearing groove along the radial direction of the powertrain.

[0014] In an embodiment of the present application, the oil pump groove is used to accommodate the oil pump and is connected to the reducer groove. The oil pump is used to provide power for the coolant in the shell. The oil pump groove is connected with the reducer groove so that the coolant in the reducer groove can flow into the oil pump groove, so that the oil pump can provide power for the coolant in the reducer groove and pump the coolant into multiple internal flow channels of the shell.

[0015] In the embodiment of the present application, the oil pump groove and the heat exchanger mounting surface are distributed on the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove, so that the oil pump groove and the heat exchanger mounting surface can utilize the space between the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove, making the layout of the powertrain more compact and also conducive to making the overall volume of the powertrain smaller.

[0016] In an embodiment of the present application, the radial oil pump groove and the heat exchanger mounting surface along the powertrain are arranged on the same side of the line between the axis of the motor groove and the axis of the output shaft bearing groove, so that the distance between the oil pump in the oil pump groove and the heat exchanger installed on the heat exchanger mounting surface is relatively close, so that the oil pump groove can quickly transport coolant to the heat exchanger for heat exchange. In addition, the short distance between the oil pump and the heat exchanger makes the coolant output by the heat exchanger have greater power, thereby enabling the heat exchanger to transport coolant with a faster flow rate to the second internal flow channel, so as to achieve fast, effective and active lubrication of the bearings of the reducer groove.

[0017] In one embodiment, the distance between the heat exchanger mounting surface and the output shaft bearing groove is smaller than the distance between the oil pump groove and the output shaft bearing groove, and the distance between the heat exchanger mounting surface and the motor groove is larger than the distance between the oil pump groove and the motor groove.

[0018] In an embodiment of the present application, the distance between the heat exchanger mounting surface and the output shaft bearing groove is smaller than the distance between the oil pump groove and the output shaft bearing groove, and the distance between the heat exchanger mounting surface and the motor groove is larger than the distance between the oil pump groove and the motor groove, so that the heat exchanger mounting surface is closer to the output shaft bearing groove than the oil pump groove, which is beneficial for making the heat exchanger mounting surface closer to the second internal flow channel and the second liquid outlet in the groove wall of the reducer groove, shortening the distance between the heat exchanger and the second liquid outlet, so that the coolant output from the heat exchanger can be output to the second liquid outlet faster, thereby lubricating the bearings accommodated in the reducer groove.

[0019] In one embodiment, the heat exchanger mounting surface is parallel to the axial direction of the power assembly, and the distance between the heat exchanger mounting surface and the oil pump groove along the radial direction of the oil pump groove is smaller than the groove width of the oil pump groove.

[0020] In the embodiment of the present application, the heat exchanger mounting surface is parallel to the axial direction of the powertrain and to the axial direction of the oil pump groove, so that the inlet of the heat exchanger mounted on the heat exchanger mounting surface can be connected with the oil pump groove along the radial direction of the oil pump groove without using a longer pipe, which is beneficial for the oil pump to provide the heat exchanger with a higher flow rate of coolant, and the coolant output from the heat exchanger is transported to the second liquid outlet through the second internal flow channel more quickly, thereby improving the active lubrication effect of the bearing in the reducer groove.

[0021] In an embodiment of the present application, the distance between the radial heat exchanger mounting surface along the oil pump groove and the oil pump groove is smaller than the groove width of the oil pump groove, so that the heat exchanger can quickly deliver coolant to the bearings of the reducer while making the layout more compact, thereby reducing the overall volume of the powertrain.

[0022] In one embodiment, the heat exchanger mounting surface may also be parallel to a direction that deviates from the axial direction of the power assembly at a small angle.

[0023] In one embodiment, the heat exchanger mounting surface includes two heat exchange holes, one heat exchange hole is used to connect the oil pump groove and the inlet of the heat exchanger, and the other heat exchange hole is used to connect the outlet of the heat exchanger, the first liquid outlet and the second liquid outlet. The notch of the oil pump groove, one heat exchange hole, the other heat exchange hole and the notch of the reducer groove are arranged in sequence along the axial direction of the powertrain.

[0024] In the embodiment of the present application, a heat exchange hole is used to connect the oil pump groove and the inlet of the heat exchanger, so that the coolant in the oil pump groove can flow into the heat exchanger through the heat exchange hole and the inlet of the heat exchanger to exchange heat in the heat exchanger. Another heat exchange hole is used to connect the outlet of the heat exchanger, the first liquid outlet and the second liquid outlet, so that the coolant after heat exchange in the heat exchanger can flow out of the heat exchanger through the outlet of the heat exchanger, flow into the first liquid outlet through another heat exchange hole and the first internal flow channel to cool and lubricate the stator of the drive motor, and also allow the coolant after heat exchange in the heat exchanger to flow into the second liquid outlet through the outlet of the heat exchanger, another heat exchange hole and the second internal flow channel to lubricate the bearing of the reducer.

[0025] In an embodiment of the present application, the slots of the axial oil pump slot, one heat exchange hole, another heat exchange hole and the slots of the reducer slot are arranged in sequence along the powertrain, so that the path between the outlet of the heat exchanger connected to the other heat exchange hole and the second liquid outlet on the inner side of the slot wall of the reducer slot is shorter. By placing the other heat exchange hole close to the reducer slot, the distance between the heat exchanger and the second liquid outlet is shortened or the length of the second internal flow channel is shortened, so that the other heat exchange hole can directly deliver coolant to the second liquid outlet of the reducer slot, thereby quickly and actively lubricating the bearing of the reducer close to the housing.

[0026] In one embodiment, the two heat exchange holes open toward the gap between the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove, so that the heat exchanger can be arranged in the gap between the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove, making full use of the space and making the layout of the power assembly more compact.

[0027] In one embodiment, the housing further comprises a avoidance groove, which is recessed from the outer wall of the axial groove bottom of the reducer groove toward the inner cavity of the reducer groove along the axial direction of the power assembly, and the avoidance groove and the heat exchanger mounting surface along the radial direction of the power assembly are arranged on the same side of the line between the axis of the motor groove and the axis of the output shaft bearing groove. Part of the heat exchanger mounting surface along the axial direction of the power assembly extends into the avoidance groove, and another heat exchange hole is distributed in the avoidance groove.

[0028] In an embodiment of the present application, the axial avoidance groove along the power assembly is recessed from the axial groove bottom outer wall of the reducer groove toward the inner cavity of the reducer groove, and the radial avoidance groove along the power assembly and the heat exchanger mounting surface are arranged on the same side of the line connecting the axis of the motor groove and the axis of the output shaft bearing groove, so that the avoidance groove can make full use of the space setting below the reducer groove to accommodate the output wheel of the reducer.

[0029] In the embodiment of the present application, the heat exchanger mounting surface along the axial part of the powertrain extends into the avoidance groove, so that the installation and fixation of the heat exchanger can utilize the space of the avoidance groove, so that the heat exchanger does not occupy too much space of the powertrain along the axial direction of the powertrain. Another heat exchange hole is distributed in the avoidance groove, so that a second internal flow channel connected to another heat exchange hole can be directly formed in the reducer groove wall, shortening the distance between the heat exchanger outlet and the second liquid outlet or shortening the length of the second internal flow channel, so that the heat exchanger can directly transport coolant to the second liquid outlet, and quickly actively lubricate the reducer bearing.

[0030] In one embodiment, the avoidance groove includes two openings, one opening away from the groove of the reducer groove along the axial direction of the powertrain, and the other opening away from the motor groove along the arrangement direction of the axis of the motor groove and the axis of the output shaft bearing groove.

[0031] In the embodiment of the present application, one opening is away from the notch of the reducer slot along the axial direction of the powertrain, so that the heat exchanger mounting surface can extend into the avoidance slot along the axial direction of the powertrain, so that the heat exchanger can be fully utilized in the axial space of the avoidance slot to be installed in the housing. Another opening is away from the motor slot along the arrangement direction of the axis of the motor slot and the axis of the output shaft bearing slot, so that another heat exchange hole can be formed by drafting along the arrangement direction of the axis of the motor slot and the axis of the output shaft bearing slot to connect to the second liquid outlet, and multiple fixing holes for fixing the heat exchanger can also be formed by drafting, so that the space can be fully utilized and the processing technology can be simplified.

[0032] In one embodiment, the groove wall of the reducer groove also includes an intermediate shaft bearing groove, the intermediate shaft bearing groove is used to fix the outer ring of the intermediate shaft bearing, and the housing also includes a connecting hole, the connecting hole is used to accommodate a plugging member, the connecting hole is used to connect another heat exchange hole and is used to connect the second liquid outlet through a second internal flow channel. Wherein, the opening of the connecting hole faces the arrangement direction that intersects the axis of the motor groove and the axis of the output shaft bearing groove. The radial connecting hole, the other heat exchange hole and the output shaft bearing groove are arranged in sequence along the power assembly. The extension line of the axis of the connecting hole and the second internal flow channel are arranged between the intermediate shaft bearing groove and the output shaft bearing groove.

[0033] In the embodiment of the present application, the shell further includes a connecting hole, which is used to connect to another heat exchange hole and to connect to the second liquid outlet through the second internal flow channel. The connecting hole is formed by integral die-casting of the shell, which is easy to operate, so that the coolant in the heat exchanger can be connected to the second internal flow channel through another heat exchange hole and the connecting hole. The connecting hole accommodates a plugging member, which can prevent the coolant in the shell from leaking from the connecting hole.

[0034] In an embodiment of the present application, the opening of the connecting hole is oriented toward an arrangement direction that intersects the axis of the motor slot and the axis of the output shaft bearing slot, so that the second internal flow channel connected to the connecting hole is also opened and arranged between the axis of the motor slot and the axis of the output shaft bearing slot.

[0035] In an embodiment of the present application, a radial connecting hole, another heat exchange hole and an output shaft bearing groove are arranged in sequence along the power assembly, so that the connecting hole can be directly formed by demolding from the outer side of the bottom of the shell away from the output shaft bearing groove along the axial direction of the connecting hole, thereby simplifying the operation.

[0036] In an embodiment of the present application, the extension line of the axis of the connecting hole and the second internal flow channel are arranged between the intermediate shaft bearing groove and the output shaft bearing groove, so that the coolant output from the heat exchanger can be transported from another heat exchange hole and the second internal flow channel to the second liquid outlet via a shorter path and more quickly, thereby achieving effective active lubrication of the bearings in the intermediate shaft bearing groove and the output shaft bearing groove.

[0037] In one embodiment, the housing further comprises a filter installation slot, the filter installation slot is used to accommodate a filter, the filter installation slot and the heat exchanger installation surface are arranged on the same side of the line between the axis of the motor slot and the axis of the output shaft bearing slot along the radial direction of the power assembly, and the first internal flow channel comprises a first section, the first section is used to connect another heat exchange hole with the filter installation slot. Among them, along the axis direction of another heat exchange hole, the first section is arranged between the other heat exchange hole and the filter installation slot, and the axis direction of the first section is the same as the axis direction of the other heat exchange hole. Along the axis direction of another heat exchange hole, the filter installation slot, the connecting hole and the other heat exchange hole are arranged in sequence.

[0038] In an embodiment of the present application, the filter mounting groove is used to accommodate a filter, and the filter is used to filter the coolant delivered from the heat exchanger through the first section to the filter to obtain coolant with higher purity, and then deliver the coolant to the first liquid outlet through the part of the first internal flow channel other than the first section for cooling and lubrication of the stator of the drive motor, thereby meeting the high cleanliness requirements of the drive motor for the coolant and reducing the damage to the stator of the drive motor caused by impurities in the coolant.

[0039] In an embodiment of the present application, the radial filter mounting groove and the heat exchanger mounting surface along the powertrain are arranged on the same side of the line between the axis of the motor groove and the axis of the output shaft bearing groove, so that the filter mounting groove and the heat exchanger are arranged closer, and the first internal flow channel includes a first section, and the first section is used to connect another heat exchange hole with the filter mounting groove. The first section of the first internal flow channel is reused in another heat exchange hole to connect the filter mounting groove, which not only simplifies the shell structure design, but also allows the coolant in the heat exchanger to flow into the filter mounting groove more quickly from another heat exchange hole and the first section, and be filtered and removed from impurities in the filter.

[0040] In an embodiment of the present application, along the axial direction of another heat exchange hole, the first section is arranged between the other heat exchange hole and the filter mounting groove, and the axial direction of the first section is the same as the axial direction of the other heat exchange hole, so that the first section and the other heat exchange hole can be demolded together to simplify the operation.

[0041] In an embodiment of the present application, the filter mounting groove, the connecting hole and the other heat exchange hole are arranged in sequence along the axial direction of the other heat exchange hole, so that the coolant flowing into the shell from the other heat exchange hole can be directly diverted through the connecting hole to the first liquid outlet and the second liquid outlet respectively, and then cool and lubricate the drive motor and the reducer respectively, thereby realizing parallel flow of the coolant, reducing the system flow resistance of the coolant, improving the cooling and lubrication efficiency of the coolant, and also reducing the workload of the oil pump.

[0042] In one embodiment, the multiple liquid outlets also include a third liquid outlet, and the heat exchanger in the power assembly transports coolant to the third liquid outlet through the first internal flow channel. The third liquid outlet is distributed on the inner side of the groove wall of the reducer groove, and the third liquid outlet is used to output coolant to cool the input shaft bearing of the reducer.

[0043] In an embodiment of the present application, a heat exchanger in a powertrain delivers coolant to a third liquid outlet through a first internal flow channel, and the third liquid outlet is distributed on the inner side of the groove wall of the reducer groove. The third liquid outlet is used to output coolant to cool the input shaft bearings distributed in the reducer groove of the reducer. In the process of the coolant output by the heat exchanger flowing from the first internal flow channel to the first liquid outlet for cooling and lubricating the stator of the drive motor, a portion of the coolant can be diverted from the third liquid outlet to flow into the reducer groove for lubrication of the input shaft bearing of the reducer, thereby further improving the active lubrication efficiency of the coolant on the bearings in the reducer groove of the reducer.

[0044] In one embodiment, the inner side of the groove wall of the reducer groove includes an output shaft bearing groove and an intermediate shaft bearing groove, and the multiple liquid outlets include two second liquid outlets, and the two second liquid outlets are respectively distributed on the groove wall of the output shaft bearing groove and the groove wall of the intermediate shaft bearing groove.

[0045] In an embodiment of the present application, the multiple liquid outlets include two second liquid outlets, and the two second liquid outlets are respectively distributed on the groove wall of the output shaft bearing groove and the groove wall of the intermediate shaft bearing groove, so that the coolant output from the heat exchanger can flow through the second internal flow channel to the two second liquid outlets and be respectively delivered to the output shaft bearing groove and the intermediate shaft bearing groove. The output shaft bearing groove is used to accommodate the output shaft bearing, and the intermediate shaft bearing groove is used to accommodate the intermediate shaft bearing, so that the coolant can quickly and effectively actively lubricate the output shaft bearing and the intermediate shaft bearing.

[0046] In one embodiment, the power assembly further includes a reducer housing, the reducer housing is used to enclose the reducer groove to form a reducer cavity, the reducer cavity is used to accommodate the gear shaft assembly of the reducer, and the first internal flow channel includes a first section and a second section. The first section of the first internal flow channel is used to transport the coolant transported by the heat exchanger to the first liquid outlet in the housing through the internal flow channel of the reducer housing and the second section of the first internal flow channel.

[0047] In an embodiment of the present application, the first section of the first internal flow channel is used to transport the coolant transported by the heat exchanger to the first liquid outlet in the shell through the internal flow channel of the reducer shell and the second section of the first internal flow channel, so that the coolant output from the outlet of the heat exchanger flows in sequence through another heat exchange hole, the connecting hole, the first section of the first internal flow channel, the internal flow channel of the reducer shell, the second section of the first internal flow channel, and flows into the first liquid outlet for cooling and lubrication of the stator of the drive motor.

[0048] In one embodiment, when the shell includes a filter mounting groove, the first internal flow channel also includes a third section, and the third section is used to connect the filter mounting groove with the internal flow channel of the reducer shell. The coolant output from the heat exchanger passes through the first section, the third section, the internal flow channel of the reducer shell, and the second section in sequence to reach the first liquid outlet.

[0049] In one embodiment, the reducer housing includes a reducer housing liquid inlet hole and a reducer housing liquid outlet hole, and the housing includes a housing liquid outlet hole and a housing liquid inlet hole. The reducer housing liquid inlet hole and the reducer housing liquid outlet hole are respectively used to connect the housing liquid outlet hole and the housing liquid inlet hole. The reducer housing liquid inlet hole and the reducer housing liquid outlet hole are connected through an internal flow channel of the reducer housing, the housing liquid outlet hole is connected to the heat exchanger through a first section of the first internal flow channel, and the housing liquid inlet hole is connected to the first liquid outlet through a second section of the first internal flow channel.

[0050] In the embodiment of the present application, the liquid inlet hole of the reducer housing and the liquid outlet hole of the reducer housing are respectively used to connect the liquid outlet hole of the housing and the liquid inlet hole of the housing, so that the coolant flowing out from the liquid outlet hole of the housing can flow from the liquid inlet hole of the reducer housing into the internal flow channel of the reducer housing, so that the coolant in the internal flow channel of the reducer housing can flow into the liquid inlet hole of the housing through the liquid outlet hole of the reducer housing.

[0051] In an embodiment of the present application, the shell outlet is connected to the heat exchanger through the first section of the first internal flow channel, so that the coolant output by the heat exchanger can flow to the shell outlet through the first section of the first internal flow channel and then flow out of the shell. The shell inlet is connected to the first outlet through the second section of the first internal flow channel, so that the coolant in the internal flow channel of the reducer shell can flow into the shell through the shell inlet, and then output to the first outlet through the second section of the first internal flow channel. The coolant output from the heat exchanger flows through the first section, the shell outlet, the reducer shell inlet, the internal flow channel of the reducer shell, the reducer shell outlet, the shell inlet, the second section, and finally flows into the first outlet for cooling and lubricating the stator of the drive motor.

[0052] In one embodiment, the powertrain includes two heat exchangers and two shells, the reducer shell includes two side surfaces, each side surface is used to enclose a reducer groove of a shell to form a reducer cavity, the internal flow channel of the reducer shell includes two internal flow channels of the reducer shell, each side surface includes a reducer shell liquid inlet hole and a reducer shell liquid outlet hole, and the reducer shell liquid inlet hole and the reducer shell liquid outlet hole on each side are connected through an internal flow channel of the reducer shell. Wherein, along the axial direction of the powertrain, the openings of the reducer shell liquid inlet holes on the two sides face opposite to each other, and the openings of the reducer shell liquid outlet holes on the two sides face opposite to each other. Along the axial direction of the powertrain, the openings of the shell liquid outlet holes of the two shells face opposite to each other, and the openings of the shell liquid inlet holes of the two shells face opposite to each other.

[0053] In the embodiment of the present application, along the axial direction of the powertrain, the openings of the reducer housing liquid inlet holes on the two sides face opposite to each other, so that the reducer housing liquid inlet holes on the two sides can respectively receive the coolant output from the housing liquid outlet holes of the two housings. The openings of the reducer housing liquid outlet holes on the two sides face opposite to each other, so that the reducer housing liquid outlet holes on the two sides can respectively output the coolant in the internal flow channels of the two reducer housings to the housing liquid inlet holes of the two housings.

[0054] In the embodiment of the present application, along the axial direction of the powertrain, the openings of the housing outlet holes of the two housings face each other, so that the coolant output from the housing outlet holes of the two housings can be output to the internal flow channel of the reducer housing more smoothly and quickly. The openings of the housing inlet holes of the two housings face each other, so that the housing inlet holes of the two housings can receive the coolant output from the housing outlet holes of the reducer on both sides more smoothly and quickly.

[0055] In the embodiment of the present application, the two heat exchangers work independently, so that the dual-motor powertrain can use one oil pump and one heat exchanger for cooling and lubrication, so that the materials of the powertrain are unified, the decoupling can be controlled, and the layout is simple. It is also possible to make the cooling and lubrication oil circuits of the two drive motors and the two reducers on both sides of the reducer housing in the powertrain independent, which can prevent single-side oil accumulation, match the multi-angle operation of the whole machine, and effectively prevent empty suction of the oil pump.

[0056] In one embodiment, the two side surfaces of the reducer housing are respectively isolated from the two reducer cavities formed by the reducer grooves of the two housings, so that the coolant stored in the two reducer cavities will not flow to each other, so that the cooling and lubrication system of the powertrain with dual motors can form two relatively independent systems, which is more conducive to decoupling control of the cooling and lubrication work of the powertrain.

[0057] In a second aspect, the present application provides an electric vehicle, comprising a frame, a power battery and a powertrain as in the first aspect, wherein the frame is used to fix the power battery and the powertrain, the power battery is used to electrically connect a drive motor of the powertrain, and the drive motor is used to drive wheels through a reducer.

[0058] In the powertrain of the embodiment of the present application, a plurality of internal flow channels and a plurality of liquid outlets are formed in the housing, the first internal flow channel is used to convey coolant to the stator of the drive motor for active cooling and the second internal flow channel is used to convey coolant to the bearing of the reducer for active lubrication, the first internal flow channel and the second internal flow channel convey coolant separately, so that the coolant for active cooling of the stator of the drive motor and the coolant for active lubrication of the bearing of the reducer can be conveyed independently, and the second liquid outlet is distributed on the inner side of the groove wall of the reducer groove, so that the coolant output from the heat exchanger and conveyed to the second liquid outlet through the second internal flow channel can directly and quickly actively lubricate the bearing of the reducer, which is conducive to increasing the flow rate of the coolant actively lubricating the reducer bearing and improving the active lubrication efficiency of the coolant on the reducer bearing. Thereby improving the active lubrication efficiency of the powertrain and optimizing the performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0060] Figure 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0061] Figure 2 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0062] Figure 3 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0063] Figure 4 is a schematic diagram of a housing provided in an embodiment of the present application;

[0064] Figure 5 is another schematic diagram of a housing provided in an embodiment of the present application;

[0065] Figure 6 is another schematic diagram of a housing provided in an embodiment of the present application;

[0066] Figure 7 yes Figure 6 A partial enlarged view of the M1 portion of the middle shell;

[0067] Figure 8 is another schematic diagram of a housing provided in an embodiment of the present application;

[0068] Fig. 9 is another schematic diagram of a housing provided in an embodiment of the present application;

[0069] Fig.10 is another schematic diagram of a housing provided in an embodiment of the present application;

[0070] Fig.11 yes Figure 6 A partial enlarged view of the M2 portion of the middle shell;

[0071] Fig.12 is a schematic diagram of a reducer housing provided in an embodiment of the present application;

[0072] Fig.13 is a schematic diagram of a motor end cover provided in an embodiment of the present application;

[0073] Fig.14 yes Fig.13 A partial enlarged view of the M3 part of the middle motor end cover;

[0074] Fig.15 is another schematic diagram of a motor end cover provided in an embodiment of the present application;

[0075] Fig.16 is a schematic diagram of a coolant flow path of a powertrain provided in an embodiment of the present application;

[0076] Fig.17 It is a schematic diagram of a powertrain provided in another embodiment of the present application. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0078] The embodiment of the present application provides a housing of a powertrain including a motor slot and a reducer slot, wherein the slot orientation of the motor slot and the slot orientation of the reducer slot are opposite to each other along the axial direction of the powertrain, the motor slot is used to fix and accommodate the stator of the drive motor in the powertrain, and the reducer slot is used to accommodate multiple bearings of the reducer in the powertrain, and the housing also includes multiple internal flow channels and multiple liquid outlets, wherein the multiple internal flow channels include a first internal flow channel and a second internal flow channel, and the multiple liquid outlets include a first liquid outlet and a second liquid outlet. Among them, the heat exchanger in the powertrain delivers coolant to the first liquid outlet through the first internal flow channel, the first liquid outlet is distributed on the inner side of the slot wall of the motor slot, and the first liquid outlet is used to output coolant to cool the stator of the drive motor. The heat exchanger in the powertrain delivers coolant to the second liquid outlet through the second internal flow channel, the second liquid outlet is distributed on the inner side of the slot wall of the reducer slot, and the second liquid outlet is used to output coolant to lubricate one or more bearings of the reducer.

[0079] The present application forms multiple internal flow channels and multiple liquid outlets in the shell, the first internal flow channel is used to transport coolant to the stator of the drive motor for active cooling and cooling, the second internal flow channel is used to transport coolant to the bearings of the reducer for active lubrication, the first internal flow channel and the second internal flow channel separately transport coolant, so that the coolant for active cooling of the stator of the drive motor and the coolant for active lubrication of the bearings of the reducer can be transported independently, and the second liquid outlet is distributed on the inner side of the groove wall of the reducer groove, so that the coolant output from the heat exchanger and transported to the second liquid outlet through the second internal flow channel can directly and quickly actively lubricate the bearings of the reducer, which is beneficial to increase the flow rate of coolant for active lubrication of the reducer bearings and improve the active lubrication efficiency of the coolant for the reducer bearings.

[0080] Figure 1 1 is a schematic diagram of an electric vehicle 1 provided in an embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30 and wheels 40. The powertrain 10 and the power battery 30 are fixed to the frame 20. The powertrain 10 is used to receive power from the power battery 30 and to drive the wheels 40. In the embodiment of the present application, the power battery 30 may also be referred to as a battery pack. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device.

[0081] Figure 2 1 is a schematic diagram of a powertrain 10 provided in an embodiment of the present application. Figure 2 As shown, the power assembly 10 includes a driving motor 11, a reducer 12 and a motor controller 13. In one embodiment, the power assembly 10 includes a driving motor 11 and a reducer 12.

[0082] In the embodiment of the present application, the motor controller 13 is used to receive direct current from the power battery 30 and output alternating current to the drive motor 11. The stator of the drive motor 11 receives the alternating current to drive the rotor and the motor shaft to rotate. The drive motor 11 is used to drive and connect the reducer 12. The reducer 12 is used to drive and connect the wheels 40 of the electric vehicle 1.

[0083] In the embodiment of the present application, the reducer 12 includes an input shaft, an intermediate shaft, an output shaft and a plurality of bearings 1200, and the input shaft, the intermediate shaft and the output shaft are rotatably connected to the inner wall of the reducer cavity 210 through the bearings 1200. Among them, the motor shaft of the drive motor 11 is used for transmission connection to the input shaft of the reducer 12. The input shaft of the reducer 12 is connected to the output shaft of the reducer 12 through the intermediate shaft and the gear transmission fixed to the intermediate shaft. The drive motor 11 converts the electric energy provided by the motor controller 13 into kinetic energy, and transmits the kinetic energy to the input shaft of the reducer 12 in the reducer 12, and the input shaft of the reducer 12 transmits the power to the internal gear of the reducer 12, and the output shaft of the reducer 12 is used to transmit the power of the drive motor 11 to the wheel 40.

[0084] In one embodiment, the power assembly 10 also includes a heat exchanger (not shown). The drive motor 11 and the reducer 12 will generate a lot of heat when working. When the temperature is too high or too low, it will affect the working effect of the drive motor 11 and the reducer 12. In this embodiment of the application, the heat exchanger is used to exchange heat for the cooling oil in the housing 100 of the power assembly 10 to cool and lubricate the drive motor 11 and the reducer 12.

[0085] In the powertrain, the coolant for lubricating the multiple bearings of the reducer is mostly collected passively or needs to be transported through the internal flow channel of the reducer end cover or through a longer path such as an oil guide pipe, so that the coolant flow for lubricating the reducer bearings is small or the path for the coolant to reach the reducer bearings is long, making the active lubrication efficiency of the coolant for the reducer bearings low.

[0086] In an embodiment of the present application, multiple internal flow channels and multiple liquid outlets are formed in the shell, the first internal flow channel is used to transport coolant to the stator of the drive motor for active cooling and cooling, and the second internal flow channel is used to transport coolant to the bearings of the reducer for active lubrication. The first internal flow channel and the second internal flow channel separately transport coolant, so that the coolant for active cooling of the stator of the drive motor and the coolant for active lubrication of the reducer bearings can be transported independently, and the second liquid outlet is distributed on the inner side of the groove wall of the reducer groove, so that the coolant output from the heat exchanger and transported to the second liquid outlet through the second internal flow channel can directly and quickly actively lubricate the bearings of the reducer, which is beneficial to increase the flow rate of coolant for active lubrication of the reducer bearings and improve the active lubrication efficiency of the coolant for the reducer bearings.

[0087] The powertrain 10 provided in an embodiment of the present application will be described in detail below.

[0088] Figure 3 is a schematic diagram of a powertrain 10 provided in an embodiment of the present application, Figure 4 is a schematic diagram of a housing 100 provided in an embodiment of the present application. Figure 5is another schematic diagram of the housing 100 provided in an embodiment of the present application. Figure 6 is another schematic diagram of the housing 100 provided in an embodiment of the present application. Figure 7 yes Figure 6 A partial enlarged view of the M1 portion of the middle housing 100 .

[0089] In one embodiment, if Figure 3 As shown, the power assembly 10 includes a drive motor 11, a reducer 12, a heat exchanger 14, an oil pump 15 and a filter 16. The power assembly 10 includes a housing 100, a motor end cover 190 and a reducer housing 200. The housing 100 includes a motor slot 110 and a reducer slot 120. Figure 4 and Figure 5 As shown, the notch 111 of the motor slot 110 and the notch 121 of the reducer slot 120 are oriented opposite to each other along the axial direction O of the power assembly 10. The motor slot 110 is used to fix and accommodate the stator of the drive motor 11 in the power assembly 10, and the reducer slot 120 is used to accommodate multiple bearings 1200 and a gear shaft assembly of the reducer 12 in the power assembly 10. The gear shaft assembly includes an input shaft, an intermediate shaft, an output shaft, and respective fixed gears. The motor end cover 190 is used to enclose the motor slot 110 to form a motor cavity 115, and the reducer housing 200 is used to enclose the reducer slot 120 to form a reducer cavity 210. The oil pump 15 is used to drive the coolant in the reducer cavity 210 to enter the heat exchanger 14. The heat exchanger 14 is used to exchange heat with the coolant. When the temperature of the drive motor 11 is high or the ambient temperature is high, the heat exchanger 14 is used to cool the coolant. The cooled coolant cools the drive motor 11 and lubricates the bearing 1200 or the gear shaft assembly of the reducer 12. When the ambient temperature is low, the heat exchanger 14 is also used to heat the coolant to reduce the viscosity of the coolant, which is beneficial to lubricate the bearing 1200 and the gear shaft assembly of the reducer 14. The filter 16 is used to filter the coolant to prevent impurities in the coolant from entering the air gap between the stator and the rotor of the drive motor and affecting the reliability and performance of the drive motor 11.

[0090] In one embodiment, if Figures 4 to 7 As shown, the housing 100 further includes a plurality of internal flow channels 130 and a plurality of liquid outlets 140, wherein the plurality of internal flow channels 130 include a first internal flow channel 131 and a second internal flow channel 132, and the plurality of liquid outlets 140 include a first liquid outlet 141 and a second liquid outlet 142. The heat exchanger 14 in the power assembly 10 delivers coolant to the first liquid outlet 141 through the first internal flow channel 131, as shown in FIG. Figure 4 As shown, the first liquid outlet 141 is distributed on the inner side of the slot wall 112 of the motor slot 110, and the first liquid outlet 141 is used to output the coolant to cool the stator of the drive motor 11. Figures 5 to 7As shown, the heat exchanger 14 in the power assembly 10 delivers coolant to the second liquid outlet 142 through the second internal flow channel 132. The second liquid outlet 142 is distributed on the inner side of the groove wall 122 of the reducer groove 120. The second liquid outlet 142 is used to output coolant to lubricate one or more bearings 1200 of the reducer 12 in the reducer groove 120.

[0091] In the embodiment of the present application, the heat exchanger 14 in the powertrain 10 transports coolant to the first liquid outlet 141 through the first internal flow channel 131 in the shell 100. The first liquid outlet 141 is distributed on the inner side of the slot wall 112 of the motor slot 110. The first liquid outlet 141 is used to output coolant to cool the stator of the drive motor 11, so that the coolant output by the heat exchanger 14 can actively lubricate the drive motor 11, and the cooled coolant in the heat exchanger 14 can cool the stator of the drive motor 11.

[0092] In the embodiment of the present application, the heat exchanger 14 in the power assembly 10 delivers coolant to the second liquid outlet 142 through the second internal flow channel 132, and the second liquid outlet 142 is distributed on the inner side of the groove wall 122 of the reducer groove 120, so that the coolant output by the heat exchanger 14 can be directly output to one or more bearings 1200 of the reducer 12 through the second liquid outlet 142, so that the coolant output by the heat exchanger 14 is quickly delivered to the bearings of the reducer 12, and effective active lubrication of the bearings of the reducer 12 is achieved. Under low temperature conditions, the heat exchanger 14 can also heat the coolant, so that the viscosity of the coolant with a lower viscosity after heating is reduced, and then it can be quickly delivered to the bearings 1200 of the reducer 12 to lubricate the bearings 1200, thereby reducing the working resistance of the bearings 1200 of the reducer 12, and achieving effective lubrication of the bearings 1200 of the reducer 12, thereby improving the low-temperature driving efficiency of the power assembly 10.

[0093] In the embodiment of the present application, the heat exchanger 14 actively delivers coolant to the second liquid outlet 142 on the inner side of the groove wall 122 of the reducer groove 120 of the housing 100 through the second internal flow channel 132 of the housing 100, so that the second internal flow channel 132 for delivering coolant and the actively lubricated bearing 1200 are distributed in the same housing 100, thereby making the delivery path of the coolant for actively lubricating one or more bearings 1200 in the reducer groove 120 shorter, and also facilitating the flow rate of the coolant for actively lubricating one or more bearings 1200 in the reducer groove 120, thereby improving the cooling effect of one or more bearings 1200 in the reducer groove 120. Compared with the passive oil collection lubrication of the bearing 1200 in the reducer groove 120 through the internal flow channel 220 in the reducer housing 200, in the embodiment of the present application, actively delivering oil to the bearing 1200 in the reducer groove 120 through the second internal flow channel 132 in the same housing 100 can improve the lubrication effect of the bearing 1200.

[0094] In the embodiment of the present application, a plurality of internal flow channels 130 and a plurality of liquid outlets 140 are formed in the shell 100, the first internal flow channel 131 is used to transport coolant to the stator of the drive motor 11 for active cooling and temperature reduction, and the second internal flow channel 132 is used to transport coolant to the bearings of the reducer 12 for active lubrication. The first internal flow channel 131 and the second internal flow channel 132 transport coolant separately, so that the coolant for actively cooling the stator of the drive motor 11 and the coolant for actively lubricating the bearings 1200 of the reducer 12 can be transported independently, and the second liquid outlet 142 is distributed on the inner side of the groove wall 122 of the reducer groove 120, so that the coolant output from the heat exchanger 14 and transported to the second liquid outlet 142 through the second internal flow channel 132 can directly and quickly actively lubricate the bearings 1200 of the reducer groove 120, which is beneficial to increase the flow rate of the coolant for actively lubricating the bearings 1200 of the reducer 12 and improve the active lubrication efficiency of the coolant for the bearings 1200 of the reducer 12.

[0095] Figure 8 It is another schematic diagram of the housing 100 provided in an embodiment of the present application.

[0096] In one embodiment, if Figures 4 to 8 As shown, the distance between the coolant flowing through the heat exchanger 14 and the second liquid outlet 142 is smaller than the distance between the coolant flowing through the heat exchanger 14 and the first liquid outlet 141. The aperture of the second liquid outlet 142 is smaller than the aperture of the first liquid outlet 141.

[0097] In the embodiment of the present application, the distance between the coolant flowing through the heat exchanger 14 and the second liquid outlet 142 is small, so that the coolant output by the heat exchanger 14 can be quickly output from the second liquid outlet 142 to effectively and actively lubricate the bearing of the reducer 12. The distance between the coolant flowing through the heat exchanger 14 and the first liquid outlet 141 is large, so that the coolant from the heat exchanger 14 can cool down other components in the housing 100 before reaching the first liquid outlet 141, thereby improving the cooling efficiency of the power assembly 10.

[0098] In the embodiments of the present application, Figure 4 and Figure 7As shown, the aperture of the second liquid outlet 142 is smaller than that of the first liquid outlet 141, and the distance between the coolant flowing through the heat exchanger 14 and the second liquid outlet 142 is smaller, so that the flow resistance of the coolant is also smaller. If the aperture of the second liquid outlet 142 is set larger, the flow resistance of the coolant will be further reduced, so that more coolant output by the heat exchanger 14 flows from the second internal flow channel 132 to the second liquid outlet 142, resulting in a smaller amount of coolant delivered to the first liquid outlet 141 through the first internal flow channel 131, which is not conducive to the cooling and lubrication of the drive motor 11. If the aperture of the first liquid outlet 141 is set larger, it is beneficial for the coolant in the first internal flow channel 131 to be output more quickly to the stator of the drive motor 11 for cooling and lubrication of the drive motor 11.

[0099] Therefore, the distance between the coolant flowing through the heat exchanger 14 and the second liquid outlet 142 is smaller than the distance between the coolant flowing through the heat exchanger 14 and the first liquid outlet 141, and the aperture of the second liquid outlet 142 is smaller than the aperture of the first liquid outlet 141, which can make the cooling and lubrication effect of the reducer 12 and the drive motor 11 in the powertrain 10 better.

[0100] in, Figure 8 The first liquid outlet 141 is only a schematic position of the first liquid outlet 141 and does not represent a specific structure. The actual structure of the first liquid outlet 141 is as follows: Figure 4 shown.

[0101] Fig. 9 It is another schematic diagram of the housing 100 provided in an embodiment of the present application.

[0102] In one embodiment, if Figure 4 As shown, the housing 100 further includes an oil pump groove 150 and a heat exchanger mounting surface 160. The oil pump groove 150 is used to accommodate the oil pump 15 and is used to communicate with the reducer groove 120. The notch 151 of the oil pump groove 150 is oriented opposite to the notch 121 of the reducer groove 120 along the axial direction O of the power assembly 10. The heat exchanger mounting surface 160 is used to fix the heat exchanger 14. Figure 6 As shown, the groove wall 122 of the reducer groove 120 includes an output shaft bearing groove 1121, and the output shaft bearing groove 1121 is used to fix the outer ring of the output shaft bearing 1201 among the multiple bearings 1200. Figure 4 As shown, the oil pump groove 150 and the heat exchanger mounting surface 160 are distributed outside the circumferential groove wall 113 of the motor groove 110 and outside the axial groove bottom 123 of the reducer groove 120. Fig. 9 As shown, along the radial direction R of the power assembly 10 , the oil pump groove 150 and the heat exchanger mounting surface 160 are arranged on the same side of a line between the axis of the motor groove 110 and the axis of the output shaft bearing groove 1121 .

[0103] In an embodiment of the present application, the oil pump groove 150 is used to accommodate the oil pump 15 and is used to connect to the reducer groove 120. The oil pump 15 is used to provide power for the coolant in the housing 100. The oil pump groove 150 is connected to the reducer groove 120, so that the coolant in the reducer groove 120 can flow into the oil pump groove 150, so that the oil pump 15 can provide power for the coolant in the reducer groove 120 and pump the coolant into multiple internal flow channels 130 of the housing 100.

[0104] In the embodiment of the present application, the oil pump groove 150 and the heat exchanger mounting surface 160 are distributed on the outer side of the circumferential groove wall 113 of the motor groove 110 and the outer side of the axial groove bottom 123 of the reducer groove 120, so that the oil pump groove 150 and the heat exchanger mounting surface 160 can utilize the space between the outer side of the circumferential groove wall 113 of the motor groove 110 and the outer side of the axial groove bottom 123 of the reducer groove 120, so that the layout of the power assembly 10 is more compact, which is also conducive to making the overall volume of the power assembly 10 smaller.

[0105] In the embodiments of the present application, Figure 4 As shown, the line between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121 is marked as A1, and along the radial R of the power assembly 10, the oil pump slot 150 and the heat exchanger mounting surface 160 are arranged on the same side of the line A1 between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121, so that the distance between the oil pump 15 in the oil pump slot 150 and the heat exchanger 14 installed on the heat exchanger mounting surface 160 is relatively close, so that the oil pump slot 150 can quickly transport coolant to the heat exchanger 14 for heat exchange. In addition, the short distance between the oil pump 15 and the heat exchanger 14 makes the coolant output by the heat exchanger 14 have greater power, thereby enabling the heat exchanger 14 to transport coolant with a faster flow rate to the second internal flow channel 132, so as to achieve fast, effective and active lubrication of the bearing 1200 of the reducer slot 120.

[0106] in, Figure 6 The middle output shaft bearing 1201 is only a schematic position of the output shaft bearing 1201 and does not represent a specific structure.

[0107] In one embodiment, if Fig. 9 As shown, the axial groove bottom 123 of the reducer groove 120 also includes a reflux hole 1231. The reflux hole 1231 penetrates the axial groove bottom 123 of the reducer groove 120 and the groove bottom of the oil pump groove 150. The reflux hole 1231 is used to connect the reducer groove 120 and the oil pump groove 150. The coolant in the reducer groove 120 flows into the oil pump groove 150 through the reflux hole 1231, so that the coolant in the power assembly 10 can circulate, thereby improving the utilization efficiency of the coolant.

[0108] In one embodiment, if Figure 4 and Fig. 9As shown, the distance between the heat exchanger mounting surface 160 and the output shaft bearing groove 1121 is smaller than the distance between the oil pump groove 150 and the output shaft bearing groove 1121 , and the distance between the heat exchanger mounting surface 160 and the motor groove 110 is larger than the distance between the oil pump groove 150 and the motor groove 110 .

[0109] In the embodiments of the present application, Figure 4 , Figure 6 and Fig. 9 As shown, the distance between the heat exchanger mounting surface 160 and the output shaft bearing groove 1121 is recorded as L1, the distance between the oil pump groove 150 and the output shaft bearing groove 1121 is recorded as L2, the distance between the heat exchanger mounting surface 160 and the motor groove 110 is recorded as L3, and the distance between the oil pump groove 150 and the motor groove 110 is recorded as L4, L1<L2, L3>L4, so that the heat exchanger mounting surface 160 is closer to the output shaft bearing groove 1121 than the oil pump groove 150, which is beneficial for making the heat exchanger mounting surface 160 closer to the second internal flow channel 132 and the second liquid outlet 142 in the groove wall 122 of the reducer groove 120, shortening the distance between the heat exchanger 14 and the second liquid outlet 142, so that the coolant output from the heat exchanger 14 can be output to the second liquid outlet 142 faster, so as to lubricate the bearing 1200 accommodated in the reducer groove 120.

[0110] In one embodiment, if Figure 5 As shown, the heat exchanger mounting surface 160 is parallel to the axial direction O of the power assembly 10. Fig. 9 As shown, the distance between the heat exchanger mounting surface 160 and the oil pump groove 150 along the radial direction R1 of the oil pump groove 150 is smaller than the groove width of the oil pump groove 150 .

[0111] In the embodiments of the present application, Figure 5 As shown, the heat exchanger mounting surface 160 is parallel to the axial direction O of the power assembly 10 and to the axial direction of the oil pump groove 150, so that the inlet of the heat exchanger 14 mounted on the heat exchanger mounting surface 160 can be connected with the oil pump groove 150 along the radial direction R1 of the oil pump groove 150 without using a longer pipeline, which is beneficial for the oil pump 15 to provide the heat exchanger 14 with a higher flow rate of coolant, and the coolant output from the heat exchanger 14 is more quickly transported to the second liquid outlet 142 through the second internal flow channel 132, thereby improving the active lubrication effect of the bearing 1200 in the reducer groove 120.

[0112] In the embodiments of the present application, Fig. 9 As shown, the distance between the heat exchanger mounting surface 160 and the oil pump groove 150 along the radial R1 of the oil pump groove 150 is recorded as L5, and the groove width of the oil pump groove 150 is recorded as L6, L5<L6, so that the heat exchanger 14 can quickly deliver coolant to the bearings of the reducer 12 while making the layout more compact, thereby reducing the overall volume of the power assembly 10.

[0113] In one embodiment, the heat exchanger mounting surface 160 may also be parallel to a direction that deviates from the axial direction O of the power assembly 10 by a small angle.

[0114] In one embodiment, if Figure 4 and Figure 5 As shown, the heat exchanger mounting surface 160 includes two heat exchange holes 161 and 162, one heat exchange hole 161 is used to connect the oil pump groove 150 and the inlet of the heat exchanger 14, and the other heat exchange hole 162 is used to connect the outlet of the heat exchanger 14, the first liquid outlet 141 and the second liquid outlet 142. In which, along the axial direction O of the power assembly 10, the notch 151 of the oil pump groove 150, the heat exchange hole 161 and the heat exchange hole 162 and the notch 121 of the reducer groove 120 are arranged in sequence.

[0115] In the embodiment of the present application, the heat exchange hole 161 is used to connect the oil pump groove 150 and the inlet of the heat exchanger 14, so that the coolant in the oil pump groove 150 can flow into the heat exchanger 14 through the heat exchange hole 161 and the inlet of the heat exchanger 14, and perform heat exchange in the heat exchanger 14. The heat exchange hole 162 is used to connect the outlet of the heat exchanger 14, the first liquid outlet 141 and the second liquid outlet 142, so that the coolant after heat exchange in the heat exchanger 14 can flow out of the heat exchanger 14 through the outlet of the heat exchanger 14, flow into the first liquid outlet 141 through the heat exchange hole 162 and the first internal flow channel 131 to cool and lubricate the stator of the drive motor 11, and also allow the coolant after heat exchange in the heat exchanger 14 to flow into the second liquid outlet 142 through the outlet of the heat exchanger 14, the heat exchange hole 162 and the second internal flow channel 132 to lubricate the bearing of the reducer 12.

[0116] In the embodiment of the present application, the slot 151 of the oil pump slot 150, the heat exchange hole 161 and the heat exchange hole 162 and the slot 121 of the reducer slot 120 are arranged in sequence along the axial direction O of the powertrain 10, so that the path between the outlet of the heat exchanger 14 connected to the heat exchange hole 162 and the second liquid outlet 142 on the inner side of the slot wall 122 of the reducer slot 120 is shorter. By bringing the heat exchange hole 162 close to the reducer slot 120, the distance between the heat exchanger 14 and the second liquid outlet 142 is shortened or the length of the second internal flow channel 132 is shortened, so that the heat exchange hole 162 can directly deliver coolant to the second liquid outlet 142 of the reducer slot 120, thereby quickly and actively lubricating the bearing of the reducer 12 close to the housing 100.

[0117] In one embodiment, if Figure 4 and Figure 5As shown, the two heat exchange holes 161 and 162 open toward the gap between the outer side of the circumferential groove wall 113 of the motor groove 110 and the outer side of the axial groove bottom 123 of the reducer groove 120. The heat exchanger 14 can be arranged in the gap between the outer side of the circumferential groove wall 113 of the motor groove 110 and the outer side of the axial groove bottom 123 of the reducer groove 120, making full use of the space and making the layout of the power assembly 10 more compact.

[0118] In one embodiment, if Figure 4 As shown, the shell 100 also includes a plurality of fixing holes 101, and the plurality of fixing holes 101 are used to fix the heat exchanger 14. Along the axial direction O of the power assembly 10, the plurality of fixing holes 101 are arranged on both sides of the heat exchange hole 161 and the heat exchange hole 162, so that the heat exchanger 14 is more stable when installed on the heat exchanger mounting surface 160, thereby improving the reliability of the power assembly 10.

[0119] Fig.10 It is another schematic diagram of the housing 100 provided in an embodiment of the present application.

[0120] In one embodiment, if Figure 4 and Fig.10 As shown, the housing 100 further includes a position avoidance groove 170, which is recessed from the outer wall of the axial groove bottom 123 of the reducer groove 120 toward the inner cavity of the reducer groove 120 along the axial direction of the power assembly 10. Fig. 9 As shown, the avoidance groove 170 and the heat exchanger mounting surface 160 are arranged on the same side of the line A1 between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121 along the radial direction R of the power assembly 10. Figure 4 and Figure 5 As shown, the heat exchanger mounting surface 160 extends into the avoidance groove 170 along the axial direction O of the power assembly 10 , and the heat exchange holes 162 are distributed in the avoidance groove 170 .

[0121] In the embodiment of the present application, the avoidance groove 170 along the axial direction O of the power assembly 10 is recessed from the outer wall of the axial groove bottom 123 of the reducer groove 120 toward the inner cavity of the reducer groove 120, and the avoidance groove 170 and the heat exchanger mounting surface 160 along the radial direction R of the power assembly 10 are arranged on the same side of the line A1 between the axis of the motor groove 110 and the axis of the output shaft bearing groove 1121, so that the avoidance groove 170 can make full use of the space setting below the reducer groove 120 to accommodate the output wheel of the reducer 12.

[0122] In the embodiments of the present application, Figure 3 and Figure 4As shown, the heat exchanger mounting surface 160 along the axial direction O of the power assembly 10 extends into the avoidance groove 170, so that the installation and fixation of the heat exchanger 14 can utilize the space of the avoidance groove 170, so that the heat exchanger 14 does not occupy too much space of the power assembly 10 along the axial direction O of the power assembly 10. The heat exchange holes 162 are distributed in the avoidance groove 170, so that the second internal flow channel 132 connected to the heat exchange holes 162 can be directly formed in the wall of the reducer groove 120, shortening the distance between the outlet of the heat exchanger 14 and the second liquid outlet 142 or shortening the length of the second internal flow channel 132, so that the heat exchanger 14 can directly transport the coolant to the second liquid outlet 142, and quickly actively lubricate the bearings of the reducer 12.

[0123] In one embodiment, if Figure 4 , Figure 5 and Fig.10 As shown, the avoidance groove 170 includes two openings 171 and 172, one opening 171 is away from the groove 121 of the reducer groove 120 along the axial direction O of the power assembly 10, and the other opening 172 is away from the motor groove 110 along the arrangement direction of the axis of the motor groove 110 and the axis of the output shaft bearing groove 1121.

[0124] In the embodiment of the present application, an opening 171 is away from the notch 121 of the reducer slot 120 along the axial direction O of the power assembly 10, so that the heat exchanger mounting surface 160 can extend into the avoidance slot 170 along the axial direction O of the power assembly 10, so that the heat exchanger 14 can make full use of the axial space of the avoidance slot 170 to be installed in the housing 100. Another opening 172 is away from the motor slot 110 along the arrangement direction of the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121, so that the heat exchange hole 162 can be formed by die drawing along the arrangement direction of the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121 to connect with the second liquid outlet 142, and multiple fixing holes 101 for fixing the heat exchanger 14 can also be formed by die drawing, so that the space can be fully utilized and the processing technology can be simplified.

[0125] In one embodiment, if Figure 6 As shown, the groove wall 122 of the reducer groove 120 also includes an intermediate shaft bearing groove 1122, and the intermediate shaft bearing groove 1122 is used to fix the outer ring of the intermediate shaft bearing 1202 in the plurality of bearings 1200, such as Figure 4 and Figure 5As shown, the housing 100 further includes a connecting hole 102, the connecting hole 102 is used to accommodate the blocking member 103, the connecting hole 102 is used to connect the heat exchange hole 162 and to connect the second liquid outlet 142 through the second internal flow channel 132. The opening of the connecting hole 102 faces the arrangement direction that intersects the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121. The connecting hole 102, the heat exchange hole 162 and the output shaft bearing slot 1121 are arranged in sequence along the radial direction R of the power assembly 10. Figure 4 and Figure 6 As shown, the extension line of the axis of the communicating hole 102 and the second internal flow channel 132 are arranged between the intermediate shaft bearing groove 1122 and the output shaft bearing groove 1121 .

[0126] In the embodiment of the present application, the housing 100 further includes a connecting hole 102, which is used to connect the heat exchange hole 162 and to connect the second liquid outlet 142 through the second internal flow channel 132. The connecting hole 102 is formed by integral die-casting of the housing 100, and the operation is simple, so that the coolant in the heat exchanger 14 can be connected to the second internal flow channel 132 through the heat exchange hole 162 and the connecting hole 102. The connecting hole 102 accommodates the blocking member 103, which can prevent the coolant in the housing 100 from leaking from the connecting hole 102.

[0127] In the embodiment of the present application, the opening of the connecting hole 102 is oriented toward an arrangement direction that intersects the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121, so that the second internal flow channel 132 connected to the connecting hole 102 is also opened and arranged between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121.

[0128] In the embodiment of the present application, the radial R connecting hole 102, the heat exchange hole 162 and the output shaft bearing groove 1121 are arranged in sequence along the power assembly 10, so that the connecting hole 102 can be directly formed by demolding from the outside of the bottom of the shell 100 away from the output shaft bearing groove 1121 along the axial direction of the connecting hole 102, thereby simplifying the operation.

[0129] In the embodiment of the present application, the extension line of the axis of the connecting hole 102 and the second internal flow channel 132 are arranged between the intermediate shaft bearing groove 1122 and the output shaft bearing groove 1121, so that the coolant output from the heat exchanger 14 can be transported from the heat exchange hole 162 and the second internal flow channel 132 to the second liquid outlet 142 via a shorter path and more quickly, thereby achieving effective active lubrication of the bearings 1200 in the intermediate shaft bearing groove 1122 and the output shaft bearing groove 1121.

[0130] In one embodiment, if Fig. 9As shown, the housing 100 further includes a filter installation groove 180, which is used to accommodate the filter 16. The filter installation groove 180 and the heat exchanger installation surface 160 are arranged on the same side of the line A1 between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121 along the radial direction R of the power assembly 10, as shown in FIG. Figure 5 As shown, the first internal flow channel 131 includes a first section 131a, and the first section 131a is used to connect the heat exchange hole 162 and the filter installation groove 180. Among them, along the axial direction of the heat exchange hole 162, the first section 131a is arranged between the heat exchange hole 162 and the filter installation groove 180, and the axial direction of the first section 131a is the same as the axial direction O1 of the heat exchange hole 162. Along the axial direction O1 of the heat exchange hole 162, the filter installation groove 180, the connecting hole 102 and the heat exchange hole 162 are arranged in sequence.

[0131] In the embodiment of the present application, the filter mounting groove 180 is used to accommodate the filter 16, and the filter 16 is used to filter the coolant transported from the heat exchanger 14 through the first section 131a to the filter 16 to obtain coolant with higher purity, and then transport the coolant to the first liquid outlet 141 through the part of the first internal flow channel 131 other than the first section 131a for cooling and lubricating the stator of the drive motor 11, thereby meeting the high cleanliness requirements of the drive motor 11 for the coolant and reducing the damage to the stator of the drive motor 11 caused by impurities in the coolant.

[0132] In the embodiment of the present application, the filter mounting groove 180 and the heat exchanger mounting surface 160 are arranged on the same side of the line A1 between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121 along the radial direction R of the power assembly 10, so that the filter mounting groove 180 and the heat exchanger 14 are arranged closer, and the first internal flow channel 131 includes a first section 131a, and the first section 131a is used to connect the heat exchange hole 162 and the filter mounting groove 180. The first section 131a of the first internal flow channel 131 is opened by reusing the heat exchange hole 162 to connect the filter mounting groove 180, which not only simplifies the structural design of the shell 100, but also allows the coolant in the heat exchanger 14 to flow into the filter mounting groove 180 more quickly from the heat exchange hole 162 and the first section 131a, and be filtered and removed in the filter 16.

[0133] In the embodiment of the present application, along the axial direction O1 of the heat exchange hole 162, the first section 131a is arranged between the heat exchange hole 162 and the filter mounting groove 180, and the axial direction of the first section 131a is the same as the axial direction of the heat exchange hole 162, so that the first section 131a and the heat exchange hole 162 can be demolded together to simplify the operation.

[0134] In the embodiment of the present application, the filter mounting groove 180, the connecting hole 102 and the heat exchange hole 162 are arranged in sequence along the axial direction O1 of the heat exchange hole 162, so that the coolant flowing into the shell 100 from the heat exchange hole 162 can be directly diverted through the connecting hole 102 to the first liquid outlet 141 and the second liquid outlet 142 respectively, and then cool and lubricate the drive motor 11 and the reducer 12 respectively, thereby realizing the parallel flow of the coolant, reducing the system flow resistance of the coolant, improving the cooling and lubrication efficiency of the coolant, and also reducing the workload of the oil pump 15.

[0135] in, Fig. 9 The filter 16 in FIG. 1 is only a schematic position of the filter 16 and does not represent a specific structure.

[0136] Fig.11 yes Figure 6 A partial enlarged view of the M2 portion of the middle housing 100.

[0137] In one embodiment, if Fig.11 As shown, the plurality of liquid outlets 140 further include a third liquid outlet 143, such as Figure 6 , Figure 8 and Fig.11 As shown, the heat exchanger 14 in the power assembly 10 delivers coolant to the third liquid outlet 143 through the first internal flow channel 131. The third liquid outlet 143 is distributed on the inner side of the groove wall 122 of the reducer groove 120. The third liquid outlet 143 is used to output coolant to cool the input shaft bearing 1203 of the reducer 12.

[0138] In the embodiment of the present application, the heat exchanger 14 in the power assembly 10 transports coolant to the third liquid outlet 143 through the first internal flow channel 131. The third liquid outlet 143 is distributed on the inner side of the groove wall 122 of the reducer groove 120. The third liquid outlet 143 is used to output coolant to cool the input shaft bearing 1203 distributed in the reducer groove 120 of the reducer 12. In the process of the coolant output by the heat exchanger 14 flowing from the first internal flow channel 131 to the first liquid outlet 141 for cooling and lubricating the stator of the drive motor 11, a portion of the coolant can be diverted from the third liquid outlet 143 to flow into the reducer groove 120 for lubrication of the input shaft bearing 1203 of the reducer 12, thereby further improving the active lubrication efficiency of the coolant on the bearing 1200 in the reducer groove 120 of the reducer 12.

[0139] in, Figure 6 The input shaft bearing 1203 in FIG. 1 is only a schematic position of the input shaft bearing 1203 and does not represent a specific structure. Figure 8 The third liquid outlet 143 in FIG. 1 is only a schematic position of the third liquid outlet 143 c and does not represent a specific structure.

[0140] In one embodiment, if Figure 6 and Figure 7As shown, the inner side of the groove wall 122 of the reducer groove 120 includes an output shaft bearing groove 1121 and an intermediate shaft bearing groove 1122, and the multiple liquid outlets 140 include two second liquid outlets 142, and the two second liquid outlets 142 are respectively distributed on the groove wall of the output shaft bearing groove 1121 and the groove wall of the intermediate shaft bearing groove 1122.

[0141] In the embodiment of the present application, the multiple liquid outlets 140 include two second liquid outlets 142, and the two second liquid outlets 142 are respectively distributed on the groove wall of the output shaft bearing groove 1121 and the groove wall of the intermediate shaft bearing groove 1122, so that the coolant output from the heat exchanger 14 can flow to the two second liquid outlets 142 through the second internal flow channel 132 and be transported to the output shaft bearing groove 1121 and the intermediate shaft bearing groove 1122 respectively. The output shaft bearing groove 1121 is used to accommodate the output shaft bearing 1201, and the intermediate shaft bearing groove 1122 is used to accommodate the intermediate shaft bearing 1202, so that the coolant can quickly and effectively actively lubricate the output shaft bearing 1201 and the intermediate shaft bearing 1202.

[0142] Fig.12 It is a schematic diagram of the reducer housing 200 provided in an embodiment of the present application.

[0143] In one embodiment, if Figure 6 and Fig.12 As shown, the reducer housing 200 is used to enclose the reducer groove 120 to form a reducer cavity 210, and the reducer cavity 210 is used to accommodate the gear shaft assembly of the reducer 12. Figure 5 and Figure 8 As shown, the first internal flow channel 131 includes a first section 131a and a second section 131b. The first section 131a of the first internal flow channel 131 is used to transport the coolant delivered by the heat exchanger 14 to the first liquid outlet 141 in the housing 100 through the internal flow channel 220 of the reducer housing 200 and the second section 131b of the first internal flow channel 131.

[0144] In the embodiment of the present application, the first section 131a of the first internal flow channel 131 is used to transport the coolant transported by the heat exchanger 14 to the first liquid outlet 141 in the shell 100 through the internal flow channel 220 of the reducer housing 200 and the second section 131b of the first internal flow channel 131, so that the coolant output from the outlet of the heat exchanger 14 flows in sequence through the heat exchange hole 162, the connecting hole 102, the first section 131a of the first internal flow channel 131, the internal flow channel 220 of the reducer housing 200, the second section 131b of the first internal flow channel 131, and flows into the first liquid outlet 141 for cooling and lubrication of the stator of the drive motor 11.

[0145] In one embodiment, if Figure 5 , Figure 8 and Fig.12As shown, when the housing 100 includes a filter mounting groove 180, the first internal flow channel 131 also includes a third section 131c, and the third section 131c is used to connect the filter mounting groove 180 with the internal flow channel 220 of the reducer housing 200. The coolant output from the heat exchanger 14 passes through the first section 131a, the third section 131c, the internal flow channel 220 of the reducer housing 200, and the second section 131b in sequence to reach the first liquid outlet 141.

[0146] In one implementation, Fig.12 As shown, the reducer housing 200 includes a reducer housing liquid inlet 201 and a reducer housing liquid outlet 202. Figure 6 and Figure 8 As shown, the housing 100 includes a housing liquid outlet 104 and a housing liquid inlet 105, and the reducer housing liquid inlet 201 and the reducer housing liquid outlet 202 are used to connect the housing liquid outlet 104 and the housing liquid inlet 105, respectively. Fig.12 As shown, the reducer housing liquid inlet 201 and the reducer housing liquid outlet 202 are connected through the internal flow channel 220 of the reducer housing 200. Figure 5 and Figure 8 As shown, the shell liquid outlet 104 is connected to the heat exchanger 14 through the first section 131 a of the first internal flow channel 131 , and the shell liquid inlet 105 is connected to the first liquid outlet 141 through the second section 131 b of the first internal flow channel 131 .

[0147] In the embodiment of the present application, the reducer housing liquid inlet hole 201 and the reducer housing liquid outlet hole 202 are respectively used to connect the housing liquid outlet hole 104 and the housing liquid inlet hole 105, so that the coolant flowing out from the housing liquid outlet hole 104 can flow from the reducer housing liquid inlet hole 201 into the internal flow channel 220 of the reducer housing 200, and the coolant in the internal flow channel 220 of the reducer housing 200 can flow into the housing liquid inlet hole 105 through the reducer housing liquid outlet hole 202.

[0148] In the embodiment of the present application, the shell liquid outlet 104 is connected to the heat exchanger 14 through the first section 131a of the first internal flow channel 131, so that the coolant output by the heat exchanger 14 can flow to the shell liquid outlet 104 through the first section 131a of the first internal flow channel 131 and then flow out of the shell 100. The shell liquid inlet 105 is connected to the first liquid outlet 141 through the second section 131b of the first internal flow channel 131, so that the coolant in the internal flow channel 220 of the reducer shell 200 can flow into the shell 100 through the shell liquid inlet 105, and then output to the first liquid outlet 141 through the second section 131b of the first internal flow channel 131. The coolant output from the heat exchanger 14 flows through the first section 131a, the shell liquid outlet 104, the reducer shell liquid inlet 201, the internal flow channel 220 of the reducer shell 200, the reducer shell liquid outlet 202, the shell liquid inlet 105, the second section 131b in sequence, and finally flows into the first liquid outlet 141 for cooling and lubricating the stator of the drive motor 11.

[0149] In one embodiment, if Figure 8 As shown, the housing 100 further includes a housing mounting surface 124, which is used to fix the reducer housing 200. The housing mounting surface 124 surrounds the notch 121 of the reducer slot 120, and the housing liquid outlet 104 and the housing liquid inlet 105 are distributed on the housing mounting surface 124. Fig.12 As shown, the reducer housing 200 further includes a reducer housing mounting surface 250, which is used to fix the housing mounting surface 124 of the housing 100. The reducer housing mounting surface 250 surrounds the opening of the reducer housing 200, and the reducer housing liquid inlet hole 201 and the reducer housing liquid outlet hole 202 are distributed on the reducer housing mounting surface 250. The housing mounting surface 124 and the reducer housing mounting surface 250 are fixed by bolts, and the housing mounting surface 124 and the reducer housing mounting surface 250 can be flat or concave-convex surfaces, as long as the housing mounting surface 124 and the reducer housing mounting surface 250 can be fixed.

[0150] In one embodiment, the reducer housing 200 includes another group of bearing grooves 230 and a plurality of reducer liquid outlets 240, the other group of bearing grooves 230 includes a plurality of bearing grooves 230, the groove peripheral wall of each bearing groove 230 of the other group of bearing grooves 230 is used to fix the outer ring of the bearing, and the heat exchanger 14 is used to transport coolant to the reducer liquid outlet 240 through the internal flow channel 220 of the reducer housing 200 to lubricate one or more bearings in the other group of bearing grooves 230. The coolant output from the heat exchanger 14 to the first liquid outlet 141 can be diverted from the reducer liquid outlet 240 when flowing through the internal flow channel 220 of the reducer housing 200 for active lubrication of the bearing of the reducer 12 on the reducer housing 200 side, further improving the lubrication efficiency of the reducer 12.

[0151] In one embodiment, if Figure 5 , Figure 8 and Fig.12 As shown, the internal flow channel 220 of each reducer housing 200 includes a fourth section 221, a fifth section 222 and a sixth section 223. The fourth section 221 is used to connect the reducer housing liquid inlet 201 and the first section 131a of the first internal flow channel 131, and the fifth section 222 is used to connect the reducer housing liquid outlet 202 and the fourth section 221. The fifth section 222 outputs the coolant of the fourth section 221 to the reducer housing 200 through the reducer housing liquid outlet 202, and then inputs it to the second section 131b of the first internal flow channel 131 of the housing 100 through the reducer housing liquid outlet 202 and the housing liquid inlet 105. The fourth section 221 and the sixth section 223 are used to transport the coolant to the multiple reducer liquid outlets 240 of the reducer housing 200, and to cool and lubricate the multiple bearings on the reducer housing 200 side.

[0152] In the embodiments of the present application, Figure 5 , Figure 8 and Fig.10 As shown, the coolant output from the heat exchanger 14 can flow through the first section 131a, the third section 131c, the housing outlet hole 104, the reducer housing inlet hole 201, the fourth section 221, the fifth section 222, the reducer housing outlet hole 202, and the second section 131b of the first internal flow channel 131 in sequence, and flow into the second outlet 142 for cooling and lubricating the stator of the drive motor 11. The coolant output from the heat exchanger 14 can flow through the first section 131a, the third section 131c, the housing outlet hole 104, the reducer housing inlet hole 201, the fourth section 221, and the sixth section 223 of the first internal flow channel 131 in sequence, and be output to the multiple reducer outlets 240 of the reducer housing 200, and be cooled and lubricated for one or more bearings 1200 on the reducer housing 200 side.

[0153] In one embodiment, the reducer housing 200 also includes a plurality of protrusions 260, which protrude toward the housing 100. The plurality of protrusions 260 are used to form a fourth section 221, a fifth section 222, and a sixth section 223 of an internal flow channel 220 of the reducer housing 200. The reducer housing 200 is directly used to form the internal flow channel 220 of the reducer housing 200, without the need for additional oil pipelines, thereby saving space, saving materials, and reducing costs.

[0154] In one embodiment, the reducer liquid outlet 240 connected to the sixth section 223 is the reducer liquid outlet 240a, and the reducer liquid outlet 240a is used to fix an oil spray nozzle (not shown), and the oil spray nozzle is used to spray oil for lubrication to the gear shaft assembly of the reducer 12. In one embodiment, the reducer liquid outlet 240 distributed in the input shaft bearing groove 231 is recorded as the reducer liquid outlet 240b, and the reducer liquid outlet 240b is directly connected to the fourth section 221 to deliver coolant to the input shaft bearing in the input shaft bearing groove 231 for lubrication.

[0155] In one embodiment, the input shaft bearing groove 231 and the intermediate shaft bearing groove 232 in another group of bearing grooves 230 of the reducer housing 200 are connected through a throttle hole 233, so that the coolant output from the reducer outlet 240 to the input shaft bearing groove 231 can be output to the intermediate shaft bearing groove 232 through the throttle hole 233, so that the coolant can actively lubricate the bearings in the input shaft bearing groove 231 and the intermediate shaft bearing groove 1122. The design of the throttle hole 233 can realize the secondary use of the coolant, reduce the active oil holes, and improve the rigidity of the reducer housing 200.

[0156] Fig.13 is a schematic diagram of a motor end cover 190 provided in an embodiment of the present application, Fig.14 yes Fig.13 A partial enlarged view of the M3 portion of the middle motor end cover 190.

[0157] In one embodiment, the housing 100 further includes a motor end cover 190, such as Figure 4 and Fig.13 As shown, the motor end cover 190 is used to enclose the motor slot 110 to form a motor cavity 115 and to fix the outer ring of the motor bearing 11a, and the inner ring of the motor bearing 11a is fixed to the motor shaft of the drive motor 11. Figure 4 As shown, the housing 100 further includes another housing mounting surface 114, which faces away from the reducer slot 120 along the axial direction O of the power assembly 10, and the housing mounting surface 114 is used to fix the motor end cover 190. Figure 8 As shown, the plurality of internal flow channels 130 further include a third internal flow channel 133, which is distributed in the slot wall of the motor slot 110, and is used to connect to the second section 131b. Figure 4 and Figure 8 As shown, the housing mounting surface 114 includes a motor outlet 106, and the housing inlet 105 is used to transport cooling liquid to the motor outlet 106 through the second section 131b and the third internal flow channel 133. Fig.13 and Fig.14As shown, the motor end cover 190 includes an end cover liquid inlet hole 191 and a motor bearing liquid outlet hole 192. The end cover liquid inlet hole 191 is used to connect to the motor liquid outlet hole 106 to receive coolant. The end cover liquid inlet hole 191 is used to lubricate the motor bearing 11a with the coolant transported to the motor bearing liquid outlet hole 192 through the internal flow channel 193 of the motor end cover 190.

[0158] In an embodiment of the present application, the multiple internal flow channels 130 also include a third internal flow channel 133, which is distributed in the cavity wall of the motor cavity 115, and the third internal flow channel 133 is used to connect to the second section 131b, so that the coolant in the second section 131b of the first internal flow channel 131 can be transported to the internal flow channel 193 of the motor end cover 190 through the third internal flow channel 133.

[0159] In an embodiment of the present application, another shell mounting surface 114 includes a motor liquid outlet 106, and the shell liquid inlet 105 is used to transport coolant to the motor liquid outlet 106 through the second section 131b and the third internal flow channel 133. The coolant flows through the shell liquid inlet 105, the second section 131b, the third internal flow channel 133, and the motor liquid outlet 106 in sequence.

[0160] In an embodiment of the present application, the motor end cover 190 includes an end cover liquid inlet hole 191 and a motor bearing liquid outlet hole 192. The end cover liquid inlet hole 191 is used to connect to the motor liquid outlet hole 106 to receive coolant. The end cover liquid inlet hole 191 is used to lubricate the motor bearing 11a with the coolant delivered to the motor bearing liquid outlet hole 192 through the internal flow channel 193 of the motor end cover 190, so that the coolant flowing out of the motor liquid outlet hole 106 can flow through the end cover liquid inlet hole 191, the internal flow channel 193 of the motor end cover 190, and the motor bearing liquid outlet hole 192 in sequence, and be output to the motor bearing 11a, thereby providing cooling and lubrication for the motor bearing 11a.

[0161] In the embodiment of the present application, the housing mounting surface 114 may be a flat surface or a concave-convex surface, as long as the housing mounting surface 114 and the motor end cover 190 can be fixed.

[0162] in, Fig.13 The motor bearing 11a in the figure only indicates the schematic position of the motor bearing 11a and does not represent the specific structure.

[0163] Fig.15 This is another schematic diagram of the motor end cover 190 provided in an embodiment of the present application.

[0164] In one embodiment, if Fig.15 As shown, the motor end cover 190 also includes a bearing lubrication hole 194, and the bearing lubrication hole 194 is used to collect the oil thrown off the motor rotor and guide the oil in a directional manner to lubricate the motor bearing 11a, thereby realizing the secondary utilization of the coolant.

[0165] in, Fig.15 The motor bearing 11a in the figure only indicates the schematic position of the motor bearing 11a and does not represent the specific structure.

[0166] In one embodiment, if Figure 4 As shown, the plurality of internal flow channels 130 further include a fourth internal flow channel 134 , which protrudes from the outer side of the slot wall 112 of the motor slot 110 away from the axis of the motor slot 110 , and the axial direction of the fourth internal flow channel 134 is the same as the axial direction of the motor slot 110 . The groove wall 112 of the motor groove 110 also includes a groove 112a and a motor liquid outlet 112b. The groove 112a is a depression from the inner side of the groove wall 112 of the motor groove 110 away from the axis of the motor groove 110. The motor liquid outlet 112b is located at the bottom of the groove 112a. The groove wall 112 of the motor groove 110 and the stator of the drive motor 11 are interference fit, so that the stator of the drive motor 11 and the groove 112a are enclosed to form a motor groove flow channel 112c. The first liquid outlet 141 is distributed at the groove bottom of the groove 112a and is connected to the motor groove flow channel 112c, so that the coolant flowing from the first liquid outlet 141 into the groove 112a of the motor groove 110 can be transported along the motor groove flow channel 112c to the motor liquid outlet 112b, so that the coolant can be transported from the motor groove flow channel 112c to the fourth internal flow channel 134. Figure 6 As shown, the multiple liquid outlets 140 also include a fourth liquid outlet 144, which is located on the inner side of the axial groove bottom 123 of the reducer groove 120, and the axis of the fourth liquid outlet 144 is coaxial with the axis of the fourth internal flow channel 134. The fourth liquid outlet 144 is used to install and fix the oil-conducting plastic part (not shown), so that the coolant in the fourth internal flow channel 134 can be output from the fourth liquid outlet 144 to the oil-conducting plastic part, and then can be sprayed onto the gear shaft assembly of the reducer 12 or the inner wall of the housing 100, so as to actively lubricate the gear shaft assembly of the reducer 12 and cool the housing 100.

[0167] in, Figure 4 The motor liquid outlet 112 b is only a schematic position of the motor liquid outlet 112 b and does not represent a specific structure. The opening of the motor liquid outlet 112 b is toward the inner cavity of the motor slot 110 along the radial direction R of the power assembly 10 .

[0168] In one embodiment, the distance between the motor liquid outlet 112b and the first liquid outlet 141 is greater than half the inner diameter of the motor slot 110, so that the fourth internal flow channel 134 and the second section 131b of the first internal flow channel 131 are separated by the slot wall 112 of the motor slot 110, which is beneficial for the fourth internal flow channel 134 to transport coolant to the reducer 12.

[0169] In one embodiment, the fourth internal flow channel 134 is arranged between the axis of the motor slot 110 and the axis of the output shaft bearing slot 1121, so that the fourth liquid outlet 144 connected to the fourth internal flow channel 134 can be distributed between the output shaft bearing slot 1121 and the intermediate shaft bearing slot 1122, so that the oil-conducting plastic part fixed by the fourth liquid outlet 144 can be fixed to the slot wall 122 of the reducer slot 120 by utilizing the space between the output shaft bearing slot 1121 and the intermediate shaft bearing slot 1122.

[0170] In one embodiment, if Figure 4 As shown, the shell 100 also includes a connecting plate 1100, which encloses the outer side of a portion of the slot wall 122 of the reducer slot 120 and the outer side of a portion of the circumferential slot wall 113 of the motor slot 110 to form an electric control cavity 1101. The electric control cavity 1101 is used to accommodate functional components of the motor controller 13, wherein the functional components of the motor controller 13 include bus capacitors (not shown) and power modules (not shown). The bus capacitors are stacked on the outer side of the portion of the slot wall 122 of the reducer slot 120 that constitute the electric control cavity 1101, and the oil-conducting plastic parts are distributed at the bottom of the outer side of the portion of the slot wall 122, so that the coolant sprayed by the oil-conducting plastic parts can directly cool the outer side of the portion of the slot wall 122, thereby cooling the bus capacitors stacked on the outer side of the portion of the slot wall 122.

[0171] Fig.16 Schematic diagram of the coolant flow path of the powertrain 10 provided in an embodiment of the present application.

[0172] In one embodiment, the combination of Figure 3 , Figure 8 , Fig. 9 , Fig.12 , Fig.13 and Fig.16The oil pump 15 draws the coolant at the bottom of the reducer cavity 210 into the oil pump groove 150 through the reflux hole 1231, and then pumps it into the heat exchanger 14 through the oil pump 15. The coolant is diverted after being output from the heat exchanger 14. A part of the coolant flows directly to the output shaft bearing groove 1121 and the intermediate shaft bearing groove 1122 from the second liquid outlet 142 through the second internal flow channel 132 of the housing 100, and actively lubricates the output shaft bearing 1201 and the intermediate shaft bearing 1202. The other part of the coolant output from the heat exchanger 14 is removed by the filter 16 and enters the internal flow channel 220 of the reducer housing. The coolant is diverted in the internal flow channel 220 of the reducer housing, and the coolant in the internal flow channel 220 of the reducer housing is transported to the nozzle through the reducer liquid outlet 240a, thereby actively lubricating the gear shaft assembly of the reducer 12. The coolant in the internal flow channel 220 of the reducer housing is delivered to the input shaft bearing groove 231 and the intermediate shaft bearing groove 232 through the reducer liquid outlet 240b, and then actively lubricates the bearings in the input shaft bearing groove 231 and the intermediate shaft bearing groove 232. The coolant in the internal flow channel 220 of the reducer housing further flows through the second section 131b of the first internal flow channel 131 to cool and lubricate the stator and rotor of the drive motor 11 from the first liquid outlet 141. The coolant output from the second section 131b can also be delivered to the input shaft bearing 1203 from the third liquid outlet 143 for active lubrication. The coolant output from the second section 131b can also be output from the third internal flow channel 133 to the motor end cover 190 to actively lubricate the motor bearing 11a on the motor end cover 190 side. The coolant output from the first liquid outlet 141 to the stator of the drive motor 11 will also flow in the motor slot channel 112c, and then be output from the motor liquid outlet 112b to the fourth internal channel 134 and the fourth liquid outlet 144, and then actively lubricate the gear shaft assembly of the reducer 12 or cool the housing 100 through the oil-conducting plastic part fixed to the fourth liquid outlet 144.

[0173] Fig.17 It is a schematic diagram of a powertrain 10 provided in another embodiment of the present application.

[0174] In one embodiment, the powertrain 10 includes two heat exchangers 14 and two housings 100. Figure 8 , Fig.12 and Fig.17As shown, the reducer housing 200 includes two side surfaces 270, each side surface 270 is used to enclose a reducer groove 120 of a housing 100 to form a reducer cavity 210, and the internal flow channel 220 of the reducer housing 200 includes two internal flow channels 220 of the reducer housing 200, each side surface 270 includes a reducer housing liquid inlet hole 201 and a reducer housing liquid outlet hole 202, and the reducer housing liquid inlet hole 201 and the reducer housing liquid outlet hole 202 of each side surface 270 are connected through an internal flow channel 220 of the reducer housing 200. Wherein, along the axial direction O of the power assembly 10, the openings of the reducer housing liquid inlet holes 201 of the two side surfaces 270 face oppositely, and the openings of the reducer housing liquid outlet holes 202 of the two side surfaces 270 face oppositely. Along the axial direction O of the power assembly 10, the openings of the housing liquid outlet holes 104 of the two housings 100 face oppositely, and the openings of the housing liquid inlet holes 105 of the two housings 100 face oppositely.

[0175] In the embodiment of the present application, along the axial direction O of the power assembly 10, the openings of the reducer housing liquid inlet holes 201 on the two side surfaces 270 face opposite to each other, so that the reducer housing liquid inlet holes 201 on the two side surfaces 270 can respectively receive the coolant output from the housing liquid outlet holes 104 of the two housings 100. The openings of the reducer housing liquid outlet holes 202 on the two side surfaces 270 face opposite to each other, so that the reducer housing liquid outlet holes 202 on the two side surfaces 270 can respectively output the coolant in the internal flow channels 220 of the two reducer housings 200 to the housing liquid inlet holes 105 of the two housings 100.

[0176] In the embodiment of the present application, along the axial direction O of the power assembly 10, the openings of the housing liquid outlet holes 104 of the two housings 100 face each other, so that the coolant output from the housing liquid outlet holes 104 of the two housings 100 can be output to the internal flow channel 220 of the reducer housing 200 more smoothly and quickly. The openings of the housing liquid inlet holes 105 of the two housings 100 face each other, so that the housing liquid inlet holes 105 of the two housings 100 can receive the coolant output from the reducer housing liquid outlet holes 202 on the two sides 270 more smoothly and quickly.

[0177] In the embodiment of the present application, the two heat exchangers 14 work independently, so that the two drive motors 11 and the two reducers 12 of the power assembly 10 can be cooled and lubricated by the two heat exchangers 14 respectively, so that the materials of the power assembly 10 are unified, the decoupling can be controlled, and the layout is simple. It is also possible to make the cooling and lubricating oil circuits of the two drive motors 11 and the two reducers 12 on both sides of the reducer housing 200 in the power assembly 10 independent, which can prevent the accumulation of oil on one side, match the multi-angle operation of the whole machine, and effectively prevent the oil pump 15 from sucking empty.

[0178] In one embodiment, the two housings 100 have the same structure, and the power assembly 10 includes two oil pumps 15 and two filters 16 .

[0179] In one embodiment, the two side surfaces 270 of the reducer housing 200 are respectively isolated and disconnected from the two reducer cavities 210 formed by the reducer grooves 120 of the two housings 100, so that the coolant stored in the two reducer cavities 210 will not flow to each other, so that the cooling and lubrication system of the powertrain with two drive motors 11 can form two relatively independent systems, which is more conducive to decoupling control of the cooling and lubrication work of the powertrain 10.

[0180] The powertrain and electric vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A powertrain, characterized in that: The housing of the power assembly includes a motor slot and a reducer slot, the slot openings of the motor slot and the reducer slot are opposite to each other along the axial direction of the power assembly, the motor slot is used to fix and accommodate the stator of the drive motor in the power assembly, and the reducer slot is used to accommodate multiple bearings of the reducer in the power assembly, the housing also includes multiple internal flow channels and multiple liquid outlets, the multiple internal flow channels include a first internal flow channel and a second internal flow channel, and the multiple liquid outlets include a first liquid outlet and a second liquid outlet, wherein: The heat exchanger in the power assembly delivers coolant to the first liquid outlet through the first internal flow channel, the first liquid outlet is distributed on the inner side of the slot wall of the motor slot, and the first liquid outlet is used to output coolant to cool the stator of the drive motor; The heat exchanger in the powertrain delivers coolant to the second liquid outlet through the second internal flow channel. The second liquid outlet is distributed on the inner side of the groove wall of the reducer groove. The second liquid outlet is used to output coolant to lubricate one or more bearings of the reducer.

2. The powertrain according to claim 1, characterized in that: The housing further comprises an oil pump groove and a heat exchanger mounting surface, wherein the oil pump groove is used to accommodate an oil pump and is used to communicate with the reducer groove, the groove opening of the oil pump groove is opposite to the groove opening of the reducer groove along the axial direction of the power assembly, the heat exchanger mounting surface is used to fix the heat exchanger, the groove wall of the reducer groove comprises an output shaft bearing groove, and the output shaft bearing groove is used to fix the outer ring of the output shaft bearing, wherein: The oil pump groove and the heat exchanger mounting surface are distributed on the outer side of the circumferential groove wall of the motor groove and the outer side of the axial groove bottom of the reducer groove; The oil pump groove and the heat exchanger mounting surface are arranged on the same side of a line between the axis of the motor groove and the axis of the output shaft bearing groove in the radial direction of the power assembly.

3. The powertrain according to claim 2, characterized in that: The distance between the heat exchanger mounting surface and the output shaft bearing groove is smaller than the distance between the oil pump groove and the output shaft bearing groove, and the distance between the heat exchanger mounting surface and the motor groove is larger than the distance between the oil pump groove and the motor groove.

4. The powertrain according to claim 2, characterized in that: The heat exchanger mounting surface is parallel to the axial direction of the power assembly, and the distance between the heat exchanger mounting surface and the oil pump groove along the radial direction of the oil pump groove is smaller than the groove width of the oil pump groove.

5. The powertrain according to claim 2, characterized in that: The heat exchanger mounting surface includes two heat exchange holes, one of which is used to connect the oil pump groove and the inlet of the heat exchanger, and the other heat exchange hole is used to connect the outlet of the heat exchanger, the first liquid outlet and the second liquid outlet, wherein: The notch of the oil pump groove, the one heat exchange hole, the other heat exchange hole and the notch of the reducer groove are arranged in sequence along the axial direction of the power assembly.

6. The powertrain according to claim 5, characterized in that: The housing further comprises a position-avoiding groove, which is recessed from the outer wall of the axial groove bottom of the reducer groove toward the inner cavity of the reducer groove along the axial direction of the power assembly, and the position-avoiding groove and the heat exchanger mounting surface are arranged on the same side of the line between the axis of the motor groove and the axis of the output shaft bearing groove along the radial direction of the power assembly, wherein: The heat exchanger mounting surface extends into the avoidance groove along the axial portion of the power assembly, and the other heat exchange hole is distributed in the avoidance groove.

7. The powertrain according to claim 6, characterized in that: The avoidance groove includes two openings, one of which is away from the groove of the reducer groove along the axial direction of the power assembly, and the other opening is away from the motor groove along the arrangement direction of the axis of the motor groove and the axis of the output shaft bearing groove.

8. The powertrain according to claim 5, characterized in that: The groove wall of the reducer groove further includes an intermediate shaft bearing groove, the intermediate shaft bearing groove is used to fix the outer ring of the intermediate shaft bearing, the housing further includes a connecting hole, the connecting hole is used to accommodate a blocking member, the connecting hole is used to connect to the other heat exchange hole and to connect to the second liquid outlet through the second internal flow channel, wherein: The opening of the communication hole faces the arrangement direction intersecting the axis of the motor slot and the axis of the output shaft bearing slot; The communicating hole, the other heat exchange hole and the output shaft bearing groove are arranged in sequence along the radial direction of the power assembly; An extension line of the axis of the communicating hole and the second internal flow passage are arranged between the intermediate shaft bearing groove and the output shaft bearing groove.

9. The powertrain according to claim 8, characterized in that: The housing further comprises a filter installation slot, the filter installation slot is used to accommodate a filter, the filter installation slot and the heat exchanger installation surface are arranged on the same side of a line between the axis of the motor slot and the axis of the output shaft bearing slot in the radial direction of the power assembly, the first internal flow channel comprises a first section, the first section is used to connect the other heat exchange hole with the filter installation slot, wherein: The first section is arranged between the other heat exchange hole and the filter installation slot along the axial direction of the other heat exchange hole, and the axial direction of the first section is the same as the axial direction of the other heat exchange hole; The filter installation groove, the connecting hole and the other heat exchange hole are arranged in sequence along the axial direction of the other heat exchange hole.

10. The power assembly according to any one of claims 1 to 9, characterized in that: The multiple liquid outlets also include a third liquid outlet. The heat exchanger in the powertrain transports coolant to the third liquid outlet through the first internal flow channel. The third liquid outlet is distributed on the inner side of the groove wall of the reducer groove. The third liquid outlet is used to output coolant to cool the input shaft bearing of the reducer.

11. The power assembly according to any one of claims 1 to 10, characterized in that: The inner side of the groove wall of the reducer groove includes an output shaft bearing groove and an intermediate shaft bearing groove, and the multiple liquid outlets include two second liquid outlets, and the two second liquid outlets are respectively distributed on the groove wall of the output shaft bearing groove and the groove wall of the intermediate shaft bearing groove.

12. The power assembly according to any one of claims 1 to 11, characterized in that: The power assembly further includes a reducer housing, the reducer housing is used to enclose the reducer groove to form a reducer cavity, the reducer cavity is used to accommodate the gear shaft assembly of the reducer, the first internal flow channel includes a first section and a second section, wherein: The first section of the first internal flow channel is used to transport the coolant delivered by the heat exchanger to the first liquid outlet in the housing through the internal flow channel of the reducer housing and the second section of the first internal flow channel.

13. The powertrain according to claim 12, characterized in that: The reducer housing includes a reducer housing liquid inlet hole and a reducer housing liquid outlet hole, and the housing includes a housing liquid outlet hole and a housing liquid inlet hole. The reducer housing liquid inlet hole and the reducer housing liquid outlet hole are respectively used to connect the housing liquid outlet hole and the housing liquid inlet hole. The reducer housing liquid inlet hole and the reducer housing liquid outlet hole are connected through the internal flow channel of the reducer housing, the housing liquid outlet hole is connected to the heat exchanger through the first section of the first internal flow channel, and the housing liquid inlet hole is connected to the first liquid outlet through the second section of the first internal flow channel.

14. The powertrain according to claim 13, characterized in that: The power assembly includes two heat exchangers and two shells, the reducer shell includes two side surfaces, each of the side surfaces is used to enclose a reducer groove of the shell to form a reducer cavity, the internal flow channel of the reducer shell includes two internal flow channels of the reducer shell, each of the side surfaces includes a reducer shell liquid inlet hole and a reducer shell liquid outlet hole, and the reducer shell liquid inlet hole and the reducer shell liquid outlet hole of each side surface are connected through an internal flow channel of the reducer shell, wherein: Along the axial direction of the power assembly, the openings of the liquid inlet holes of the reducer housing on the two side surfaces face opposite to each other, and the openings of the liquid outlet holes of the reducer housing on the two side surfaces face opposite to each other; Along the axial direction of the power assembly, the openings of the housing liquid outlet holes of the two housings face oppositely, and the openings of the housing liquid inlet holes of the two housings face oppositely.

15. An electric vehicle, characterized in that: The electric vehicle includes a frame, a power battery and a power assembly as described in any one of claims 1 to 14, wherein the frame is used to fix the power battery and the power assembly, the power battery is used to electrically connect the drive motor of the power assembly, and the drive motor is used to drive the wheels through the reducer.

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