Oil cooling power assembly and electric vehicle

Abstract

The invention provides an oil cooling power assembly and an electric vehicle. A shell of the oil cooling power assembly comprises an integrated shell, a motor end cover and a speed reducer end cover, the integrated shell comprises a motor groove and a speed reducer groove, the motor end cover is used for enclosing the motor groove, and the speed reducer end cover is used for enclosing the speed reducer groove. The shell of the oil cooling power assembly further comprises a cooling oil way and a lubricating oil way, the cooling oil way is used for communicating the filter of the oil cooling power assembly and the heat exchanger of the oil cooling power assembly, and the lubricating oil way is used for communicating the filter. The oil filtered by the filter is divided into two paths, one path lubricates the speed reducer contained in the speed reducer groove through the lubricating oil path, the other path flows into the heat exchanger through the cooling oil path, and the oil subjected to heat exchange of the heat exchanger is used for cooling at least one of a stator and a rotor of the driving motor contained in the motor groove. The cooling and lubricating performance of the oil cooling power assembly is good, and the performance of the oil cooling power assembly and the endurance mileage of the electric vehicle can be improved.

Description

Technical Field

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

[0002] In order to better meet the space requirements of electric vehicles, the powertrain in electric vehicles tends to be miniaturized and highly integrated. However, the cooling and lubrication performance of the miniaturized and highly integrated powertrain in the prior art is poor, which affects the performance of the powertrain and is not conducive to improving the cruising range of electric vehicles. Summary of the invention

[0003] The present application provides an oil-cooled powertrain and an electric vehicle. The oil-cooled powertrain has good cooling and lubrication performance, which is beneficial to improving the performance of the oil-cooled powertrain, thereby increasing the cruising range of the electric vehicle.

[0004] In the first aspect, an embodiment of the present application provides an oil-cooled powertrain, wherein the housing of the oil-cooled powertrain includes an integrated housing, a motor end cover, and a reducer end cover, wherein the integrated housing includes a motor slot and a reducer slot, wherein the motor end cover is used to enclose the motor slot, and the reducer end cover is used to enclose the reducer slot. The housing of the oil-cooled powertrain also includes a cooling oil circuit and a lubricating oil circuit, wherein the cooling circuit is used to connect the filter of the oil-cooled powertrain and the heat exchanger of the oil-cooled powertrain, and the lubricating circuit is used to connect the filter. Among them, the oil filtered by the filter is divided into two paths, one path is used to lubricate the reducer accommodated in the reducer slot through the lubricating oil circuit, and the other path is used to flow into the heat exchanger through the cooling oil circuit, and the oil after heat exchange in the heat exchanger is used to cool at least one of the stator and the rotor of the drive motor shaft machine accommodated in the motor slot.

[0005] In the oil-cooled powertrain provided in the embodiment of the present application, the oil filtered by the filter is divided into two paths according to the lubricating oil circuit and the cooling oil circuit. The hot oil flowing into the lubricating oil circuit directly lubricates the reducer without passing through the heat exchanger, making full use of the low viscosity of the hot oil to reduce the rotation load of each gear of the reducer and the oil stirring loss, thereby improving the lubrication effect of the reducer. The hot oil flowing into the cooling oil circuit cools the drive motor after heat exchange in the heat exchanger, thereby improving the heat dissipation and cooling effect of the drive motor. In this way, the cooling and lubrication performance of the oil-cooled powertrain is better, which is conducive to improving the performance of the oil-cooled powertrain.

[0006] In one implementation, the integrated housing is also used to fix the heat exchanger, and an end surface of the reducer end cover facing the reducer groove includes an oil outlet, and the oil outlet is used to connect to the filter through the internal oil passage of the reducer end cover. An end surface of the integrated housing facing the reducer end cover includes an oil inlet, and the oil inlet is used to connect to an oil outlet of the reducer end cover and to connect to the heat exchanger through the internal oil passage of the housing. Among them, an oil outlet of the reducer end cover, the internal oil passage of the reducer end cover, an oil inlet of the integrated housing, and the internal oil passage of the integrated housing form a cooling oil circuit.

[0007] The oil filtered by the filter flows into an oil outlet of the reducer end cover through an internal channel of the reducer end cover, flows along the oil inlet of the integrated shell connected to the oil outlet of the reducer end cover, and flows into the heat exchanger through the internal oil channel of the integrated shell.

[0008] Compared with external pipelines, the cooling oil circuit is deployed in the housing of the oil-cooled powertrain, which can reduce the risk of oil leakage in the cooling oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain.

[0009] In one implementation, the inner wall of the reducer end cover includes another oil outlet, and the other oil outlet of the reducer end cover is used to connect to the filter through the internal oil passage of the reducer end cover. The other oil outlet of the reducer end cover and the internal oil passage of the reducer end cover form a lubricating oil circuit.

[0010] The oil filtered by the filter flows into another oil outlet on the inner wall of the reducer end cover through the inside of the reducer end cover, and flows into the reducer cavity formed by the reducer end cover and the reduction groove along another oil outlet on the inner wall of the reducer end cover to lubricate the reducer.

[0011] Compared with external pipelines, the lubricating oil circuit is deployed inside the reducer end cover, which can reduce the risk of oil leakage in the lubricating oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain.

[0012] In one implementation, the reducer includes a transmission shaft, a primary gear set, a secondary gear set and a differential, the primary gear set is used to drive the transmission shaft and the motor shaft of the drive motor, the transmission shaft is used to drive the differential through the secondary gear set, and the reducer slot is also used to accommodate the transmission shaft, the primary gear set, the secondary gear set and the oil guide pipe. Among them, the oil guide pipe surrounds the driving wheel of the secondary gear set, one end of the oil guide pipe is used to connect the lubricating oil circuit and to receive the oil filtered by the filter through the lubricating oil circuit, and the other end of the oil guide pipe is used to output the oil.

[0013] The oil output by the oil guide pipe can actively lubricate the reducer, thereby improving the lubrication effect of the reducer, which in turn is beneficial to improving the performance of the oil-cooled powertrain.

[0014] In addition, the diameter of the driven wheel of the first-stage gear set of the reducer is larger than the driving wheel of the second-stage gear set, and the oil guide pipe surrounds the driving wheel of the second-stage gear set, which can make full use of the radial free space between the driving wheel of the second-stage gear set and the reducer groove along the drive motor, which is conducive to the miniaturization of the oil-cooled powertrain.

[0015] In one implementation, the other end of the oil guide pipe includes two oil outlets, and the directions of the two oil outlets are opposite along the axial direction of the drive motor. Among them, one of the two oil outlets is used to output oil to lubricate the driving wheel of the first-stage gear set, and the other of the two oil outlets is used to output oil to lubricate the driven wheel of the second-stage gear set.

[0016] The two oil outlets at the other end of the oil guide pipe can respectively actively lubricate the driving wheel of the first-stage gear set and the driven wheel of the second-stage gear set of the reducer, thereby improving the lubrication effect of the reducer, thereby facilitating improving the performance of the oil-cooled powertrain.

[0017] In one implementation, the diameter of the driving wheel of the primary gear set is smaller than the diameter of the driven wheel of the secondary gear set, and the distance between the two oil outlets and the central axis of the motor shaft is greater than or equal to the radius of the driven wheel of the secondary gear set. Along the gravity direction, the two oil outlets at the other end of the oil guide pipe are distributed above the driving wheel of the primary gear set and the driven wheel of the secondary gear set of the reducer. The oil output from the two oil outlets at the other end of the oil guide pipe can actively lubricate the driving wheel of the primary gear set and the driven wheel of the secondary gear set of the reducer, thereby improving the utilization rate of the oil, which is beneficial to improving the performance of the oil-cooled powertrain.

[0018] In one implementation, the wall of the oil guide pipe includes a plurality of oil outlet holes, and each of the plurality of oil outlet holes is used to output oil to lubricate the driving wheel of the secondary gear set.

[0019] The multiple oil outlet holes on the wall of the oil guide pipe can respectively actively lubricate the driving wheel of the secondary gear set of the reducer, thereby improving the lubrication effect of the reducer, which is beneficial to improving the performance of the oil-cooled powertrain.

[0020] In one implementation, the integrated housing further includes two other oil inlets and two bearing slots, one of the two bearing slots is used to fix a bearing of the transmission shaft, the other of the two bearing slots is used to fix a bearing of the motor shaft, and each of the other two oil inlets is used to communicate with one of the two bearing slots. The oil guide pipe is also used to output oil to the bearing slot connected to at least one of the other two oil inlets through at least one of the other two oil inlets.

[0021] The oil guide pipe can actively lubricate the various bearings of the powertrain through the other two oil inlets on the integrated housing, thereby improving the lubrication effect of the reducer, which in turn helps to improve the performance of the oil-cooled powertrain.

[0022] In one implementation, the distance between one of the other two oil inlets and one bearing groove is smaller than the distance between one oil inlet and the other bearing groove. The distance between another of the other two oil inlets and the other bearing groove is smaller than the distance between the other oil inlet and the one bearing groove.

[0023] By arranging each of the other two oil inlets close to one of the two bearing grooves, the path of the oil circuit from the oil guide pipe to each bearing groove can be shortened, thereby improving the lubrication efficiency of the reducer, which is beneficial to improving the performance of the oil-cooled powertrain.

[0024] In one implementation, the reducer groove is also used to accommodate an oil collecting groove, which is distributed between the driving wheel of the secondary gear set and the oil guide pipe. The notch of the oil collecting groove faces the oil guide pipe, and the notch of the oil collecting groove is used to collect oil leaked from the oil guide pipe.

[0025] The oil collecting tank can reduce the oil stored in the reducer tank and reduce the oil churning loss, thereby improving the lubrication effect of the reducer, which is beneficial to improving the performance of the oil-cooled powertrain.

[0026] In one implementation, the bottom of the oil collecting tank includes a plurality of oil outlets, and the plurality of oil outlets are used to output oil to lubricate the driving wheel of the secondary gear set.

[0027] The oil collecting tank guides the collected oil to the driving wheel of the secondary gear set through multiple oil outlets at the bottom of the tank, lubricates the driving wheel of the secondary gear set, thereby improving the lubrication effect of the reducer, which is beneficial to improving the performance of the oil-cooled powertrain.

[0028] In one implementation, the oil collecting groove includes a protrusion, the protrusion protrudes in a direction away from the driven wheel of the primary gear set along the axial direction of the drive motor, and the protrusion includes an oil outlet, and the oil outlet of the protrusion is used to output oil to lubricate the differential.

[0029] The oil collecting tank guides the collected oil to the differential through the oil outlet on the protrusion to lubricate the differential, thereby improving the lubrication effect of the reducer, which is beneficial to improving the performance of the oil-cooled powertrain.

[0030] In one implementation, the reducer end cover includes a differential slot and a filter slot, wherein the differential slot is used to accommodate the differential of the reducer, and the filter slot is used to accommodate and fix the filter. The slot wall of the differential slot protrudes from the side of the reducer end cover away from the reducer slot along the axial direction of the drive motor, and the direction of the notch of the filter slot is the same as the protruding direction of the slot wall of the differential slot.

[0031] The filter is arranged on the side of the reducer end cover away from the reducer groove, which can facilitate the layout of the lubricating oil circuit of the oil-cooled power assembly. In addition, the free space on the side of the reducer end cover away from the reducer groove can be fully utilized, which is conducive to the miniaturization of the oil-cooled power assembly.

[0032] In one implementation, the motor slot includes an oil outlet, and the oil outlet of the motor slot is used to connect to the heat exchanger through the internal oil channel of the integrated shell, and the oil outlet of the motor slot is used to receive the oil after heat exchange by the heat exchanger through the internal oil channel of the integrated shell and to output the oil to cool the stator of the drive motor.

[0033] The oil after heat exchange by the heat exchanger flows into the oil outlet of the motor slot through a channel inside the integrated housing, and flows into the motor slot along the oil outlet of the motor slot to cool the stator of the drive motor.

[0034] The oil outlet of the motor slot and the internal part of the integrated housing connected thereto form the stator oil circuit of the drive motor. Compared with the external pipeline, the stator oil circuit is deployed inside the integrated housing, which can reduce the risk of oil leakage in the stator oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain.

[0035] In one implementation, an end surface of the motor end cover facing the motor slot includes an oil inlet, and the oil inlet of the motor end cover is used to connect to the internal oil passage of the motor end cover, and an end surface of the integrated housing facing the motor end cover includes an oil outlet, and the oil outlet of the integrated housing is used to connect to an oil inlet of the motor end cover and to connect to the heat exchanger through the internal oil passage of the integrated housing. The oil after heat exchange in the heat exchanger is used to flow into the shaft cavity of the motor shaft of the drive motor through the internal oil passage of the integrated housing, an oil outlet of the integrated housing, an oil inlet of the motor end cover, and the internal oil passage of the motor end cover to cool the rotor of the drive motor.

[0036] The oil after heat exchange in the heat exchanger flows into the oil outlet of the integrated shell through the internal channel of the integrated shell, flows into the internal oil channel of the motor end cover along the oil inlet of the motor end cover connected to the oil outlet of the integrated shell, and flows into the shaft cavity of the motor shaft through the internal oil channel of the motor end cover to cool the rotor of the drive motor.

[0037] The oil outlet of the integrated housing and the internal oil passage of the integrated housing connected thereto, as well as the oil inlet of the motor end cover and the internal oil passage of the motor end cover connected thereto form the rotor oil circuit of the drive motor. Compared with the external pipe, the rotor oil circuit is deployed in the housing of the oil-cooled powertrain, which can reduce the risk of oil leakage in the stator oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain.

[0038] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising wheels, a transmission mechanism, and an oil-cooled powertrain as described in the first aspect and any one of its implementations, the oil-cooled powertrain being used to drive two front wheels or two rear wheels through two half-shafts, respectively.

[0039] The performance of the oil-cooled powertrain provided in the embodiment of the present application is improved, which is beneficial to increasing the cruising range of the electric vehicle and improving the driving experience of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0041] Figure 2 A schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application.

[0042] Figure 3 A schematic diagram of a transmission system of an oil-cooled powertrain provided in an embodiment of the present application.

[0043] Figure 4 A schematic diagram of a housing of an oil-cooled powertrain provided in an embodiment of the present application.

[0044] Figure 5 and Figure 6 Each of them is a schematic diagram of an integrated shell provided in an embodiment of the present application.

[0045] Figure 7 A schematic diagram of a motor end cover provided in an embodiment of the present application.

[0046] Figure 8 A schematic diagram of a reducer end cover provided in an embodiment of the present application.

[0047] Fig. 9 A schematic diagram of the oil circuit of an oil-cooled powertrain provided in an embodiment of the present application.

[0048] Fig.10 Another schematic diagram of an integrated housing provided in an embodiment of the present application.

[0049] Fig.11 Another schematic diagram of the reducer end cover provided in an embodiment of the present application.

[0050] Fig.12 A schematic diagram of a cooling oil circuit provided in an embodiment of the present application.

[0051] Fig.13 A schematic diagram of an oil guide pipe provided in an embodiment of the present application.

[0052] Fig.14Another schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application.

[0053] Fig.15 Another schematic diagram of the oil guide pipe provided in an embodiment of the present application.

[0054] Fig.16 Another schematic diagram of an integrated housing provided in an embodiment of the present application.

[0055] Fig.17 A schematic diagram of an oil collecting tank provided in an embodiment of the present application.

[0056] Fig.18 Another schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application.

[0057] Fig.19 Another schematic diagram of the oil collecting tank provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0059] The "equal" in this application is not equal to the strict sense, but is within the tolerance range. The "parallel" is not parallel to the strict sense, but is within the tolerance range. The "perpendicular" is not perpendicular to the strict sense, but is within the tolerance range.

[0060] In the embodiments of the present application, the same reference numerals represent the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings as an example. For other identical parts or components, the reference numerals are also applicable. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0061] Figure 1A schematic diagram of an electric vehicle provided in an embodiment of the present application. The electric vehicle provided in an embodiment of the present application includes a pure electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, a plug-in hybrid electric vehicle or a new energy vehicle, etc. Among them, a pure electric vehicle is also called a pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. A hybrid electric vehicle is also called a hybrid electric vehicle, or simply HEV. An extended-range electric vehicle is also called a range extended electric vehicle, or simply REEV. A plug-in hybrid electric vehicle is also called a plug-in hybrid electric vehicle, or simply PHEV. A new energy vehicle is also called a newenergy vehicle, or simply NEV.

[0062] like Figure 1 As shown, the electric vehicle 1 includes an oil-cooled powertrain 10 and a power battery 20. The oil-cooled powertrain 10 is used to receive power from the power battery 20 and to convert electrical energy into mechanical energy to drive the wheels of the electric vehicle 1.

[0063] In one embodiment, the electric vehicle 1 includes two oil-cooled power assemblies 10, one of the two oil-cooled power assemblies 10 is used to drive the two front wheels of the electric vehicle 1, and the other of the two oil-cooled power assemblies 10 is used to drive the two rear wheels of the electric vehicle 1. In one embodiment, the electric vehicle 1 includes four oil-cooled power assemblies 10, and the four oil-cooled power assemblies 10 are used to drive the four wheels of the electric vehicle 1 respectively.

[0064] like Figure 1 As shown, the electric vehicle 1 also includes a power module 40. The power module 40 is used to receive power from an external power source 50 to charge the power battery 20. In one embodiment, the external power source 50 is an AC power grid, an AC charging pile, or a DC charging pile. The power module 40 includes at least one of a DC charger or an AC charger.

[0065] The present application also provides an oil-cooled powertrain. In one embodiment, the oil-cooled powertrain includes a drive motor and a reducer, and the drive motor is used to drive the wheels of the electric vehicle through the reducer.

[0066] like Figure 1 As shown, the oil-cooled powertrain 10 provided in the embodiment of the present application includes a drive motor 100 and a reducer 200 , and the drive motor 100 drives the wheels of the electric vehicle 1 through the reducer 200 .

[0067] In one embodiment, the oil-cooled powertrain further includes a motor controller, wherein the motor controller is used to control the drive motor to drive the wheels of the electric vehicle.

[0068] like Figure 1 As shown, the oil-cooled powertrain 10 provided in the embodiment of the present application further includes a motor controller 300. The motor controller 300 is used to receive the DC power output by the power battery 20, convert the DC power output by the power battery 20 into AC power and control the drive motor 100 to drive the wheels of the electric vehicle 1.

[0069] Figure 2 A schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application. Figure 2 As shown, the oil-cooled powertrain 10 includes a drive motor 100 and a reducer 200 .

[0070] The driving motor 100 includes a stator 110 , a rotor 120 and a motor shaft 130 . The motor shaft 130 is used to fix the rotor 120 .

[0071] In one embodiment, Figure 2 As shown, the oil-cooled power assembly 10 further includes a motor controller 300, which is used to convert the direct current output by the power battery 20 into alternating current. The motor controller 300 outputs three-phase alternating current to the stator winding of the stator 110 of the drive motor 100, thereby controlling the rotor 120 of the drive motor 100 to rotate relative to the stator 110, and the rotor 120 drives the motor shaft 130 to rotate.

[0072] Continue to refer Figure 2 As shown, the stator 110 of the driving motor 100 includes a stator core 111 and a stator winding 112. The stator core 111 is used to wind the stator winding 112. The stator winding 112 is used to receive the alternating current provided by the motor controller 300.

[0073] In one embodiment, the stator winding 112 includes three-phase windings and three winding busbars, wherein each phase winding in the three-phase winding includes multiple sets of windings connected in parallel, and the multiple sets of windings connected in parallel in each phase winding receive one-phase alternating current through one winding busbar.

[0074] Figure 3 A schematic diagram of a transmission system of an oil-cooled powertrain provided in an embodiment of the present application. Figure 3As shown, the reducer 200 in the oil-cooled powertrain 10 includes a transmission shaft 210, a primary gear set 220, a secondary gear set 230 and a differential 240. The transmission shaft 210 of the reducer 200 is arranged in parallel with the motor shaft 130 of the drive motor 100, that is, the transmission shaft 210 of the reducer 200 is offset from the motor shaft 130 of the drive motor 100. The primary gear set 220 of the reducer 200 is used to drive and connect the transmission shaft 210 of the reducer 200 and the motor shaft 130 of the drive motor 100, and the transmission shaft 210 of the reducer 200 is used to drive and connect the differential 240 through the secondary gear set 230, and the differential 240 is used to drive one of the two wheels of the electric vehicle 1.

[0075] like Figure 3 As shown, the primary gear set 220 includes a driving wheel 221 and a driven wheel 222. The driving wheel 221 of the primary gear set 220 is used to be fixed to the motor shaft 130, and the driven wheel 222 of the primary gear set 220 is used to be fixed to the transmission shaft 210. The driving wheel 221 and the driven wheel 222 of the primary gear set 220 are meshed with each other, and the rotation of the motor shaft 130 of the drive motor 100 drives the transmission shaft 210 of the reducer 200 to rotate.

[0076] like Figure 3 As shown, the secondary gear set 230 includes a driving wheel 231 and a driven wheel 232. The driving wheel 231 of the secondary gear set 230 is used to be fixed to the transmission shaft 210, and the driven wheel 222 of the secondary gear set 230 is used to drive and connect the differential 240. The driving wheel 221 and the driven wheel 222 of the secondary gear set 230 are meshed, and the rotation of the transmission shaft 210 of the reducer 200 drives the differential 240 to rotate.

[0077] Continue to refer Figure 3 As shown, the oil-cooled powertrain 10 further includes a drive shaft 400, and the transmission shaft 210 of the reducer 200 is also used to drive and connect the drive shaft 400 and the differential 240 through the secondary gear set 230, and the drive shaft 400 is used to drive the other wheel of the two wheels of the electric vehicle 1. In one embodiment, the drive shaft 400 can also be called a transfer half shaft.

[0078] like Figure 4As shown, one end of the motor shaft 130 is used to fix the rotor 120 of the drive motor 100, and the other end of the motor shaft 130 is used to fix the driving wheel 221 of the primary gear set 220. In other words, the motor shaft 130 of the drive motor 100 serves as both the transmission shaft of the drive motor 100 and the shaft that drives the driving wheel 221 of the primary gear set 220 of the reducer 200 to rotate. The motor shaft 130 of the drive motor 100 and the input shaft of the reducer 200 are set to the same shaft. In addition, the motor shaft 130 of the drive motor 100 and the transmission shaft 210 of the reducer 200 are arranged in parallel. Therefore, the oil-cooled powertrain 10 provided in the embodiment of the present application can also be called an offset coaxial oil-cooled powertrain 10.

[0079] Figure 4 A schematic diagram of the housing of the oil-cooled powertrain provided in an embodiment of the present application. Figure 4 As shown, the housing of the oil-cooled powertrain 10 includes an integrated housing 500, a motor end cover 510 and a reducer end cover 520. The integrated housing 500 includes a motor slot G1 and a reducer slot G2. The motor end cover 510 is used to enclose the motor slot G1 to form a receiving chamber for the drive motor 100. The reducer end cover 520 is used to enclose the reducer slot G2 to form a receiving chamber for the reducer 200.

[0080] One end of the motor shaft 130 of the driving motor 100 is used to be accommodated in the motor slot G1, and the other end is used to extend into the reducer slot G2 to fix the driving wheel 221 of the primary gear set 220. In addition, one end of the two ends of the driving shaft 400 extends into the reducer slot G2 through the shaft cavity of the motor shaft 130 to be transmission-connected to the differential 240 of the reducer 200, and the other end of the two ends of the driving shaft 400 is used to be transmission-connected to the other wheel of the two wheels of the electric vehicle 1.

[0081] In one embodiment, the orientation of the slot of the motor slot G1 is opposite to the orientation of the slot of the reducer slot G2 along the axial direction of the drive motor 100. In other words, the motor slot G1 and the reducer slot G2 are arranged opposite to each other along the axial direction of the drive motor 100 of the oil-cooled power assembly 10.

[0082] In the embodiment of the present application, the axial direction of the drive motor 100 can be understood as the axial direction of the motor shaft 130 of the drive motor 100 , the axial direction of the stator core 111 of the drive motor 100 , the axial direction of the reducer 200 , and the axial direction of the oil-cooled power assembly 10 .

[0083] In one embodiment, the integrated housing 500 of the oil-cooled powertrain 10 further includes an electric control slot G3 , which is used to accommodate the electrical components of the motor controller 300 .

[0084] In some embodiments, the housing of the oil-cooled power assembly 10 further includes an electric control cover plate 530 , and the electric control cover plate 530 is used to enclose the electric control slot G3 to form an electric control accommodating cavity.

[0085] In one embodiment, the orientation of the notch of the electric control slot G3 is perpendicular to the orientation of the notch of the motor slot G1 and the orientation of the notch of the reducer slot G2.

[0086] Figure 5 and Figure 6 They are schematic diagrams of an integrated housing provided in an embodiment of the present application. Figure 5 and Figure 6 As shown, the integrated housing 500 further includes an oil storage tank G4, and the reducer tank G2 and the motor tank G1 are distributed on the same side of the oil storage tank G4 along the radial direction of the drive motor 100. Figure 5 and Figure 6 As shown, the reducer slot G2 and the motor slot G1 are both distributed above the oil storage tank G4. The oil storage tank G4 is used to store oil, and the oil stored in the oil storage tank G4 is used to lubricate and cool the oil-cooled power assembly 10.

[0087] In the embodiment of the present application, the radial direction of the drive motor 100 can be understood as the radial direction of the motor shaft 130 of the drive motor 100 , the radial direction of the stator core 111 of the drive motor 100 , the radial direction of the reducer 200 , and the radial direction of the oil-cooled power assembly 10 .

[0088] The oil storage tank G4 is integrated in the integrated housing 500 of the oil-cooled powertrain 10 having the reducer slot G2 and the motor slot G1, so that the oil storage tank G4 serves as a dry oil sump of the oil-cooled powertrain 10 and does not need to be set up separately or assembled. This can reduce the size of the oil-cooled powertrain 10, thereby facilitating the miniaturization and cost reduction of the oil-cooled powertrain 10 and saving space in the electric vehicle 1.

[0089] Combination Figure 5 and Figure 6 The oil storage tank G4 includes two openings 501 and 502, and the two openings 501 and 502 are arranged opposite to each other along the axial direction of the driving motor 100. The oil-cooled power assembly 10 also includes two end covers, one of the two end covers is used to enclose one opening 501 of the two openings 501 and 502 of the oil storage tank G4, and the other end cover is used to enclose the other opening 502 of the two openings 501 and 502 of the oil storage tank G4.

[0090] In one embodiment, one of the two end covers and the reducer end cover 520 are an integrated structure. It can also be understood that the reducer groove G2 and the opening 501 of the oil storage groove G4 share one end cover. This can simplify the assembly operation of the oil-cooled power assembly 10, reduce the size of the oil-cooled power assembly 10, and further facilitate the miniaturization and cost reduction of the oil-cooled power assembly 10.

[0091] In one embodiment, the other of the two end covers and the motor end cover 510 are an integrated structure. It can also be understood that the motor slot G1 and the opening 502 of the oil storage tank G4 share one end cover. This can simplify the assembly operation of the oil-cooled power assembly 10, reduce the size of the oil-cooled power assembly 10, and further facilitate the miniaturization and cost reduction of the oil-cooled power assembly 10.

[0092] The oil stored in the oil storage tank G4 comes from the motor slot G1, that is, the oil storage tank G4 is used to collect the oil in the motor slot G1. Figure 5 As shown, the integrated housing 500 also includes an oil return hole 503. The oil return hole 503 of the integrated housing 500 is used to penetrate the wall shared by the motor slot G1 and the oil storage tank G4. The oil storage tank G4 is used to collect the oil refluxed in the reducer slot G2 through the oil return hole 503 of the integrated housing 500.

[0093] In the oil-cooled powertrain 10 provided in the embodiment of the present application, the oil storage tank G4 is separated from the motor slot G1, and the oil return hole 503 is set on the wall shared by the oil storage tank G4 and the motor slot G1, so that the oil storage tank G4 can collect the oil refluxed from the motor slot G1 through the oil return hole 503 of the integrated housing 500, and the oil storage tank G4 is equivalent to the dry oil sump of the drive motor 100 of the oil-cooled powertrain 10. In this way, the oil in the motor slot G1 can be reduced, the oil inflow into the air gap of the drive motor 100 can be avoided, the loss of oil can be reduced, and the over-temperature ablation of the drive motor 100 can be prevented. In this way, the performance of the oil-cooled powertrain 10 is improved, which is conducive to the high performance of the oil-cooled powertrain 10, which is conducive to improving the cruising range of the electric vehicle 1 and improving the driving experience of the electric vehicle 1.

[0094] Figure 7 A schematic diagram of a motor end cover provided in an embodiment of the present application. In one embodiment, as Figure 5 As shown, the oil return hole 503 of the integrated housing 500 is also used to communicate with the opening 502 of the oil storage tank G4. Figure 7 As shown, the motor end cover 510 includes an oil return groove 511, and the oil return groove 511 of the motor end cover 510 is used to communicate with the oil return hole 503 of the integrated housing 500. Therefore, the oil return groove 511 of the motor end cover 510 and the oil return hole 503 of the integrated housing 500 together form the oil return structure of the accommodating chamber of the drive motor 100, and the oil in the accommodating chamber of the drive motor 100 flows back to the oil storage tank G4 through the oil return structure of the accommodating chamber of the drive motor 100.

[0095] The oil stored in the oil storage tank G4 comes from the reducer tank G2, that is, the oil storage tank G4 is used to collect the oil in the reducer tank G2. Figure 6As shown, the integrated housing 500 also includes another oil return hole 504. The oil return hole 504 of the integrated housing 500 is used to penetrate the wall shared by the reducer groove G2 and the oil storage groove G4. The oil storage groove G4 is used to collect the oil refluxed in the reducer groove G2 through the oil return hole 504 of the integrated housing 500.

[0096] In the oil-cooled powertrain 10 provided in the embodiment of the present application, the oil storage tank G4 is separated from the reducer tank G2, and the oil return hole 504 is set on the wall shared by the oil storage tank G4 and the reducer tank G2, so that the oil storage tank G4 can collect the oil refluxed from the reducer tank G2 through the oil return hole 504 of the integrated housing 500, and the oil storage tank G4 is equivalent to the dry oil sump of the reducer 200 of the oil-cooled powertrain 10. Therefore, the oil in the reducer tank G2 can be reduced, the oil stirring loss of the reducer 200 can be reduced, and the performance of the oil-cooled powertrain 10 can be improved, which is conducive to the high performance of the oil-cooled powertrain 10, and is conducive to improving the cruising range of the electric vehicle 1 and improving the driving experience of the electric vehicle 1.

[0097] In one embodiment, the electric control slot G3 and the oil storage tank G4 are distributed on both sides of the reducer slot G2 and the motor slot G1 along the radial direction of the drive motor 100. When the oil-cooled power assembly 10 is fixed to the electric vehicle 1, the oil storage tank G4 is placed at the lowest point, the electric control slot G3 is placed at the highest point, and the reducer slot G2 and the motor slot G1 are arranged in the middle position along the direction of gravity. Therefore, under the action of gravity, the oil in the reducer slot G2 and the oil in the motor slot G1 can all flow into the oil storage tank G4 below, thereby improving the oil collection effect of the oil storage tank G4. In addition, the oil in the reducer slot G2 and the oil in the motor slot G1 will not flow into the electric control slot above it, thereby preventing the oil from affecting the performance of the electrical components of the motor controller in the electric control slot.

[0098] Figure 8 A schematic diagram of a reducer end cover provided in an embodiment of the present application. In one embodiment, as Figure 6 As shown, the oil return hole 504 of the integrated housing 500 is also used to communicate with the opening 501 of the oil storage tank G4. Figure 8 As shown, the reducer end cover 520 includes an oil return groove 521, and the oil return groove 521 of the reducer end cover 520 is used to communicate with the oil return hole 504 of the integrated housing 500. Therefore, the oil return groove 521 of the reducer end cover 520 and the oil return hole 504 of the integrated housing 500 together form the oil return structure of the accommodating cavity of the reducer 200, and the oil in the accommodating cavity of the reducer 200 flows back to the oil storage tank G4 through the oil return structure of the accommodating cavity of the reducer 200.

[0099] refer to Figure 5As shown, the motor slot G1 includes an oil outlet 505, and the oil outlet 505 of the motor slot G1 is used to output oil to cool the drive motor 100 accommodated in the motor slot G1. Therefore, the oil in the motor slot G1 collected by the oil storage tank G4 can be recycled, thereby improving the utilization rate of the oil.

[0100] refer to Figure 8 As shown, the reducer end cover 520 includes an oil outlet 522, and the oil outlet 522 of the reducer end cover 520 is used to output oil to lubricate the reducer 200 contained in the reducer groove G2. Therefore, the oil in the reducer groove G2 collected by the oil storage tank G4 can be recycled, thereby improving the utilization rate of the oil.

[0101] In one embodiment, the diameter of each of the two oil return holes 503 and 504 of the integrated housing 500 is larger than the diameter of the oil outlet 522 of the reducer end cover 520 and the diameter of the oil outlet 505 of the motor slot G1. Thus, the oil in the reducer slot G2 can quickly flow into the oil storage tank G4, thereby improving the performance of the oil-cooled power assembly 10.

[0102] In one embodiment, the interval between the oil outlet 522 of the reducer end cover 520 and the oil return hole 504 along the radial direction of the drive motor 100 occupies an angle range of 90 degrees to 180 degrees. The interval between the oil outlet 505 of the motor slot G1 and the oil return hole 503 along the radial direction of the drive motor 100 occupies an angle range of 90 degrees to 180 degrees. Thus, the oil output from the oil outlet 522 of the reducer end cover 520 and the oil outlet 505 of the motor slot G1 can fully lubricate and cool the oil-cooled power assembly 10, and the lubricating or cooling oil can fully flow into the oil storage tank G4, thereby improving the utilization rate of the oil.

[0103] In one embodiment, the angular range occupied by the interval between the oil outlet 522 of the reducer end cover 520 and the oil return hole 504 can be understood as the angle range between the projection of the oil outlet 522 of the reducer end cover 520 along the axial direction of the drive motor 100 along the radial center line of the drive motor 100 and the projection of the oil return hole 504 along the axial direction of the drive motor 100 along the radial center line of the drive motor 100.

[0104] In one embodiment, the angular range occupied by the interval between the oil outlet 505 and the oil return hole 503 along the radial motor slot G1 of the drive motor 100 can be understood as the angle range between the projection of the oil outlet 505 along the axial motor slot G1 of the drive motor 100 along the radial center line of the drive motor 100 and the projection of the axial oil return hole 503 along the radial center line of the drive motor 100.

[0105] Fig. 9 A schematic diagram of the oil circuit of the oil-cooled powertrain provided in the embodiment of the present application. Fig. 9 As shown, the oil-cooled power assembly 10 further includes an oil pump 600. The oil pump 600 is used to absorb the oil in the oil storage tank G4 and to deliver the oil to the oil outlet 505 of the motor slot G1 and the oil outlet 522 of the reducer end cover 520. Thus, the oil outlet 505 of the motor slot G1 outputs the oil in the oil storage tank G4 delivered by the oil pump 600 to cool the drive motor 100 accommodated in the motor slot G1, and the oil outlet 522 of the reducer end cover 520 outputs the oil in the oil storage tank G4 delivered by the oil pump 600 to lubricate the reducer 200 accommodated in the reducer slot G2.

[0106] In one embodiment, Figure 6 As shown, the oil storage tank G4 further includes two tank walls 506 and 507, one of the two tank walls 506 and 507 includes an oil pump suction port 508, and the oil pump 600 is used to suck the oil from the oil storage tank G4 through the oil pump suction port 508. Therefore, the oil pump 600 sucking the oil from the oil storage tank G4 will not interfere with the oil refluxed in the reducer tank G2 and the oil refluxed in the motor tank G1 collected by the oil storage tank G4, and it can also prevent the oil pump 600 from having a dry suction phenomenon, so as not to affect the oil suction capacity of the oil pump 600, thereby improving the performance of the oil-cooled power assembly 10.

[0107] In one embodiment, the arrangement directions of the two groove walls 506 and 507 of the oil storage groove G4 are respectively perpendicular to the axial direction of the drive motor 100 and the arrangement direction of the oil storage groove G4 and the reducer groove G2.

[0108] In one embodiment, the distance between the two groove walls 506 and 507 of the oil storage tank G4 decreases along the direction of the oil storage tank G4 away from the reducer groove, so that the oil in the reducer groove G2 or the motor groove G1 can quickly flow into the oil storage tank G4, thereby improving the performance of the oil-cooled power assembly 10.

[0109] Fig.10 Another schematic diagram of an integrated housing provided in an embodiment of the present application. Fig.10 As shown, the integrated housing 500 further includes an oil pump groove 610, which is used to accommodate and fix the oil pump 600, and the oil pump groove 610 is used to communicate with the oil pump suction port 508 through the internal oil passage of the integrated housing 500. The orientation of the notch of the oil pump groove 610 is the same as the orientation of the notch of the motor groove G1, and the oil pump groove 610 and the motor groove G1 are distributed on the same side of the reducer groove G2 along the axial direction of the drive motor 100.

[0110] Generally, the size of the reducer groove G2 is larger than the size of the motor groove G1, the oil pump groove 610 and the motor groove G1 are arranged on one side, and the reducer groove G2 is arranged on the other side. In addition, the connecting oil passage between the oil pump groove 610 and the oil storage tank G4 is also arranged in the integrated housing 500, so that the space of the integrated housing 500 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10.

[0111] In one embodiment, Fig. 9 As shown, the oil-cooled power assembly 10 further includes a primary filter 700. The primary filter 700 first filters the oil sucked from the oil storage tank G4 by the oil pump 600, and then introduces the filtered oil into the oil pump 600. This can improve the purity of the oil and improve the lubrication and cooling effects of the oil-cooled power assembly 10.

[0112] In one embodiment, the integrated housing 500 further includes a primary filter groove 710 , which is used to accommodate and fix the primary filter 700 of the oil-cooled power assembly 10 , and the primary filter groove 710 is used to connect the oil pump suction port 508 and the oil pump groove 610 .

[0113] In one embodiment, combining Figure 6 and Fig.10 The primary filter groove 710 and the oil pump groove 610 are arranged opposite to each other along the axial direction of the oil pump groove 610. In other words, the primary filter groove 710 and the oil pump groove 610 are arranged back to back along the axial direction of the oil pump groove 610. Thus, the space of the integrated housing 500 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10.

[0114] In one embodiment, Fig. 9 As shown, the oil-cooled powertrain 10 further includes a secondary filter 800, which is used to receive the oil delivered by the oil pump 600 and to perform secondary filtration on the oil delivered by the oil pump 600. This improves the purity of the oil, thereby improving the lubrication and cooling effects of the oil-cooled powertrain 10.

[0115] Fig.11 Another schematic diagram of a reducer end cover provided in an embodiment of the present application. In one embodiment, the reducer end cover 520 includes a secondary filter slot 523, which is used to accommodate and fix the secondary filter 800 of the oil-cooled power assembly 10, and the secondary filter slot 523 is used to connect to the oil pump slot 610.

[0116] It should be understood that the filtering accuracy of the secondary filter 800 is greater than the filtering accuracy of the primary filter 700. In other words, the particle size of impurities filtered by the secondary filter 800 is smaller than the particle size of impurities filtered by the primary filter 700.

[0117] In one embodiment, the reducer end cover 520 includes a differential slot 524, and the differential slot 524 is used to accommodate the differential 240 of the reducer 200. Fig.11 As shown, the groove wall of the differential groove 524 protrudes from the side of the reducer end cover 520 away from the reducer groove G2 along the axial direction of the drive motor 100, and the direction of the notch of the secondary filter groove 523 is the same as the protruding direction of the groove wall of the differential groove 524. In this way, the external space of the reducer end cover 520 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10. In addition, the secondary filter groove 523 is arranged on the side of the reducer end cover 520 away from the reducer groove G2, which can facilitate the layout of the lubricating oil circuit R of the oil-cooled power assembly 10.

[0118] In one embodiment, Fig. 9 As shown, the oil-cooled powertrain 10 further includes a heat exchanger 900, a cooling oil circuit L and a lubricating oil circuit R. The cooling oil circuit L and the lubricating oil circuit R are distributed in the housing of the oil-cooled powertrain 10. The cooling circuit L is used to connect the secondary filter 800 and the heat exchanger 900, and the lubricating circuit R is used to connect the secondary filter 800. The oil filtered by the secondary filter 800 is divided into two paths, one path is used to lubricate the reducer 200 accommodated in the reducer groove G2 through the lubricating oil circuit R, and the other path flows into the heat exchanger 900 through the cooling oil circuit L. The oil after heat exchange in the heat exchanger 900 is used to cool at least one of the stator 110 and the rotor 120 of the drive motor 100 accommodated in the motor groove G1.

[0119] The oil filtered by the secondary filter 800 is divided into two paths according to the lubricating oil circuit R and the cooling oil circuit L. The hot oil flowing into the lubricating oil circuit R directly lubricates the reducer 200 without passing through the heat exchanger 900, making full use of the low viscosity of the hot oil to reduce the rotation load and oil stirring loss of the first-stage gear set 220 and the second-stage gear set 230 of the reducer 200, thereby improving the lubrication effect of the reducer 200. The hot oil flowing into the cooling oil circuit L cools the drive motor 100 after heat exchange in the heat exchanger 900, thereby improving the heat dissipation and cooling effect of the drive motor 100. The cooling and lubrication performance of the oil-cooled powertrain 10 is better, which is beneficial to improving the performance of the oil-cooled powertrain 10. This is beneficial to improving the cruising range of the electric vehicle 1 and improving the driving experience of the electric vehicle 1.

[0120] In one embodiment, the reducer end cover 520 includes a first cooling oil circuit, and the integrated housing 500 includes a second cooling oil circuit, the first cooling oil circuit is used to connect the secondary filter tank 523 and the second cooling oil circuit, the second cooling oil circuit is used to connect the oil inlet of the heat exchanger 900, and the oil outlet of the heat exchanger 900 is used to connect the oil outlet 505 of the motor tank G1. The first cooling oil circuit and the second cooling oil circuit form a cooling oil circuit L.

[0121] The oil filtered by the secondary filter 800 is introduced from the reducer end cover 520 of the oil-cooled powertrain 10 into the heat exchanger 900 on the integrated housing 500 of the oil-cooled powertrain 10 through the first cooling oil circuit and the second cooling oil circuit, thereby making full use of the space of the reducer end cover 520 of the oil-cooled powertrain 10 and the space of the integrated housing 500, thereby reducing the size of the oil-cooled powertrain 10.

[0122] In addition, compared with external pipelines, the cooling oil circuit is deployed in the shell of the oil-cooled powertrain 10, which can reduce the risk of oil leakage in the cooling oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain.

[0123] In one embodiment, reference Figure 8 As shown, one end surface of the reducer end cover 520 facing the reducer groove G2 includes another oil outlet 524, and the other oil outlet 524 of the reducer end cover 520 is used to communicate with the secondary filter groove 523 through the internal oil passage of the reducer end cover 520. The internal oil passage of the reducer end cover 520 and the other oil outlet 524 of the reducer end cover 520 form a first cooling oil circuit.

[0124] In one embodiment, the outlet of another oil outlet 524 of the reducer end cover 520 is oriented toward the reducer groove G2 along the axial direction of the drive motor 100. This can shorten the first cooling oil circuit, thereby reducing the flow resistance of the oil and improving the cooling effect of the drive motor 100 of the oil-cooled power assembly 10.

[0125] In one embodiment, reference Figure 6 As shown, one end surface of the integrated housing 500 facing the reducer end cover 520 includes an oil inlet 509, and the oil inlet 509 of the integrated housing 500 is used to connect to another oil outlet 524 of the reducer end cover 520 and the oil inlet of the heat exchanger 900 through the internal oil passage of the integrated housing 500. The oil inlet 509 of the integrated housing 500 and the internal oil passage of the integrated housing 500 form a second cooling oil circuit.

[0126] Fig.12 A schematic diagram of a cooling oil circuit provided in an embodiment of the present application. Figure 8 , Figure 6 and Fig.12 As shown, the oil filtered by the secondary filter 800 flows into the oil outlet 524 of the reducer end cover 520 through the internal oil channel of the reducer end cover 520, flows along the oil inlet 509 of the integrated shell 500 connected to the oil outlet 524 of the reducer end cover 520, and flows into the heat exchanger 900 through the internal oil channel of the integrated shell 500.

[0127] In one embodiment, the inlet of an oil inlet 509 of the integrated housing 500 is away from the reducer end cover 520 along the axial direction of the drive motor 100. This can shorten the second cooling oil circuit, thereby reducing the flow resistance of the oil and improving the cooling effect of the drive motor of the oil-cooled powertrain 10.

[0128] In one embodiment, Fig.10 As shown, the outer wall of the integrated housing 500 further includes an oil inlet 901 and an oil outlet 902. The oil inlet 901 of the outer wall of the integrated housing 500 is used to connect the oil outlet 505 of the motor slot G1 and the oil outlet of the heat exchanger 900, and the oil outlet 902 of the outer wall of the integrated housing 500 is used to connect the oil inlet of the heat exchanger 900. Thus, the oil in the oil outlet 902 of the outer wall of the integrated housing 500 flows into the heat exchanger through the oil inlet of the heat exchanger 900, and the oil after heat exchange in the heat exchanger 900 flows into the oil outlet 505 of the motor slot G1 through the oil outlet of the heat exchanger 900 and the oil inlet 901 of the outer wall of the integrated housing 500, and flows into the motor slot G1 along the oil outlet 505 of the motor slot G1 to cool the drive motor 100.

[0129] In one embodiment, the oil inlet 901 of the outer wall of the integrated housing 500 and the oil outlet 902 of the outer wall of the integrated housing 500 are respectively arranged on a side of the oil pump groove 600 away from the oil storage tank G4 along the radial direction of the drive motor 100.

[0130] The oil inlet 901 of the outer wall of the integrated housing 500 connected to the oil outlet of the heat exchanger 900, the oil outlet 902 of the outer wall of the integrated housing 500 connected to the oil inlet of the heat exchanger 900, the oil pump groove 600 and the motor groove G1 are arranged on one side, and the reducer groove G2 is arranged on the other side, so that the space of the integrated housing 500 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10. In addition, relative to the oil inlet 901 of the outer wall of the integrated housing 500 connected to the oil outlet of the heat exchanger 900 and the oil outlet 902 of the outer wall of the integrated housing 500 connected to the oil inlet of the heat exchanger 900, the oil pump groove 600 is arranged close to the oil storage tank G4, so that sufficient oil pressure can be ensured to send oil to the reducer groove G2 and the motor groove G1, so as to avoid excessive flow resistance of the oil affecting the transmission of the oil.

[0131] In one embodiment, the outlet of the oil outlet 505 of the motor slot G1 is directed toward the drive motor 100 along the radial direction of the drive motor 100. Thus, the oil path between the oil outlet of the heat exchanger 900 and the oil outlet 505 of the motor slot G1 can be shortened, thereby reducing the flow resistance of the oil and improving the cooling effect of the drive motor 100 of the oil-cooled power assembly 10.

[0132] In one embodiment, the oil inlet 901 of the outer wall of the integrated housing 500 is used to connect to the oil outlet 505 of the motor slot G1 through the internal oil passage of the integrated housing 500. That is, the oil outlet 505 of the motor slot G1 is used to connect to the heat exchanger 900 through the internal oil passage of the integrated housing 500 and the oil inlet 901 of the outer wall of the integrated housing 500, and the oil outlet 505 of the motor slot G1 is used to receive the oil after heat exchange in the heat exchanger 900 through the internal oil passage of the integrated housing 500 and to output the oil to cool the drive motor 100. Thus, the oil after heat exchange in the heat exchanger 900 flows into the oil outlet 505 of the motor slot G1 through the oil outlet of the heat exchanger 900, the oil inlet 901 of the outer wall of the integrated housing 500 and the internal oil passage of the integrated housing 500, and flows into the motor slot G1 along the oil outlet 505 of the motor slot G1 to cool the drive motor 100.

[0133] In one embodiment, the oil inlet 901 on the outer wall of the integrated housing 500, the internal oil passage of the integrated housing 500 connected thereto, and the oil outlet 505 of the motor slot G1 form a stator oil circuit of the drive motor 100. Compared with an external pipeline, the stator oil circuit is arranged inside the integrated housing 500, which can reduce the risk of oil leakage in the stator oil circuit, thereby improving the utilization rate of the oil, which is beneficial to improving the performance of the oil-cooled powertrain 10.

[0134] In one embodiment, reference Figure 7 As shown, one end surface of the motor end cover 510 facing the motor slot G1 includes an oil inlet 512, and the oil inlet 512 of the motor end cover 510 is used to connect to the internal oil passage of the motor end cover 510. Figure 5 As shown, one end surface of the integrated housing 500 facing the motor end cover 510 includes another oil outlet 5010, and the oil outlet 5010 of the integrated housing 500 is used to connect the heat exchanger 900 and the oil inlet 512 for connecting the motor end cover 510 through the internal oil passage of the integrated housing 500. The oil outlet 5010 of the integrated housing 500 and the internal oil passage of the integrated housing 500 connected thereto, and the oil inlet 512 of the motor end cover 510 and the internal oil passage of the motor end cover 510 connected thereto flow form the rotor oil passage of the drive motor 100. Thus, the oil after heat exchange in the heat exchanger 900 is used to flow into the shaft cavity of the motor shaft 130 of the drive motor 100 through the internal oil passage of the integrated housing 500, the oil outlet 5010 of the integrated housing 500, the oil inlet 512 of the motor end cover 510, and the internal oil passage of the motor end cover 510 to cool the rotor of the drive motor 100. Compared with external pipelines, the rotor oil circuit is deployed in the housing of the oil-cooled powertrain 10, which can reduce the risk of oil leakage in the stator oil circuit, thereby improving the utilization rate of the oil and helping to improve the performance of the oil-cooled powertrain 10.

[0135] In one embodiment, the motor end cover 510 is also used to accommodate an annular oil guide plate, which is used to receive cooling oil from the internal oil channel of the motor end cover 510 and transport the received cooling oil to the shaft cavity of the motor shaft 130.

[0136] In one embodiment, reference Fig.10 As shown, the outer wall of the electric control tank G3 further includes a liquid inlet 903 and a liquid outlet 904. The liquid inlet 903 of the electric control tank G3 is used to connect to the liquid outlet of the heat exchanger 900, and the liquid outlet 904 of the electric control tank G3 is used to connect to the liquid inlet of the heat exchanger 900. The coolant of the heat exchanger 900 is used to exchange heat for the electrical components of the motor controller 300. The coolant flow channel is integrated in the integrated housing 500, so that the space of the integrated housing 500 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10.

[0137] In one embodiment, the inlet of the liquid inlet 903 of the electric control tank G3 is away from the heat exchanger 900 in a direction perpendicular to the outer wall of the electric control tank G3, and the outlet of the liquid outlet 904 of the electric control tank G3 is toward the heat exchanger 900 in a direction perpendicular to the outer wall of the electric control tank G3. Thus, the coolant flow channel between the heat exchanger 900 and the electric control tank G3 can be shortened, thereby reducing the flow resistance of the coolant and improving the cooling effect of the motor controller 300 of the oil-cooled power assembly 10.

[0138] In one embodiment, the oil outlet 522 of the reducer end cover 520 is used to communicate with the secondary filter groove 523 through the internal oil passage of the reducer end cover 520. The oil outlet 522 of the reducer end cover 520 and the internal oil passage of the reducer end cover 520 form a lubricating oil passage R. The oil filtered by the secondary filter 800 flows into the oil outlet 522 of the reducer end cover 520 through the internal oil passage of the reducer end cover 520, and flows along the oil outlet 522 of the reducer end cover 520 into the reducer cavity formed by the reducer end cover 520 and the reduction groove G2 to lubricate the reducer 200.

[0139] The lubricating oil circuit R is arranged in the reducer end cover 520 of the oil-cooled power assembly 10, so that the space of the reducer end cover 520 of the oil-cooled power assembly 10 can be fully utilized, thereby reducing the size of the oil-cooled power assembly 10. In addition, compared with the external pipeline, the lubricating oil circuit R is arranged in the reducer end cover 520, which can reduce the risk of oil leakage in the lubricating oil circuit R, thereby improving the utilization rate of the oil, which is conducive to improving the performance of the oil-cooled power assembly 10.

[0140] In one embodiment, the outlet of the oil outlet 522 of the reducer end cover 520 is oriented toward the reducer groove G2 along the axial direction of the drive motor 100 , thereby reducing the flow resistance of the oil and improving the lubrication effect of the reducer 200 of the oil-cooled power assembly 10 .

[0141] In one embodiment, the oil-cooled power assembly 10 further includes an oil guide pipe 1000, and the reducer groove G2 is also used to accommodate the oil guide pipe 1000. The oil guide pipe 1000 is a hollow structure, and the oil outlet 522 of the reducer end cover 520 outputs oil through the oil guide pipe 1000 to lubricate the reducer 200 accommodated in the reducer groove G2. This improves the lubrication effect of the reducer 200, which is beneficial to improving the performance of the oil-cooled power assembly 10.

[0142] Fig.13 A schematic diagram of an oil guide tube provided in an embodiment of the present application. One end 1001 of the oil guide tube 1000 is used to be embedded in the oil outlet 522 of the reducer end cover 520, that is, one end 1001 of the oil guide tube 1000 is used to connect to the lubricating oil circuit R through the oil outlet 522 of the reducer end cover 520, and receive the oil filtered by the secondary filter 800. The other end 1002 of the oil guide tube 1000 is used to output oil to actively lubricate the reducer 200.

[0143] Fig.14 Another schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application. Fig.14 As shown, the oil guide pipe 1000 surrounds the driving wheel 231 of the secondary gear set 230. Since the diameter of the driven wheel 222 of the primary gear set 220 of the reducer 200 is larger than the driving wheel 231 of the secondary gear set 230, the oil guide pipe 1000 surrounds the driving wheel 231 of the secondary gear set 230, and the idle space between the driving wheel 231 of the secondary gear set 230 and the reducer groove G2 along the radial direction of the drive motor 100 can be fully utilized, which is conducive to the miniaturization of the oil-cooled power assembly 10.

[0144] In one embodiment, the oil output from the oil guide pipe 1000 is used to actively lubricate the driving wheel 221 of the primary gear set 220 and the driven wheel 232 of the secondary gear set 230 of the reducer 200 .

[0145] Fig.15 Another schematic diagram of the oil guide pipe provided in the embodiment of the present application. Fig.13 and Fig.15The other end 1002 of the oil guide pipe 1000 includes two oil outlets 1003a and 1003b, one of the two oil outlets 1003a and 1003b is used to output oil to lubricate the driving wheel 221 of the primary gear set 220, and the other of the two oil outlets 1003a and 1003b is used to output oil to lubricate the driven wheel 232 of the secondary gear set 230. The two oil outlets 1003a and 1003b of the other end 1003 of the oil guide pipe 1000 can respectively actively lubricate the driving wheel 221 of the primary gear set 220 of the reducer 200 and the driven wheel 232 of the secondary gear set 230, thereby improving the lubrication effect of the reducer 200, which is beneficial to improving the performance of the oil-cooled power assembly 10.

[0146] In one embodiment, the two oil outlets 1003a and 1003b are oriented in opposite directions along the axial direction of the drive motor 100. Fig.13 and Fig.15 As shown, the other end 1002 of the oil guide tube 1000 includes two bending sections 1002a and 1002b, and the bending direction of one of the two bending sections 1002a and 1002b is opposite to the bending direction of the other bending section 1002b along the axial direction of the drive motor 100, and the outlet of the bending section 1002a forms the oil outlet 1002a, and the outlet of the bending section 1002b forms the oil outlet 1003b.

[0147] In one embodiment, the diameter of the driving wheel 221 of the primary gear set 220 is smaller than the diameter of the driven wheel 232 of the secondary gear set 230, and the distance between the two oil outlets 1001 and 1002 and the central axis of the motor shaft 130 is greater than or equal to the radius of the driven wheel 232 of the secondary gear set 230. When the oil-cooled power assembly 10 is fixed to the electric vehicle 1, along the direction of gravity, the two oil outlets 1003a and 1003b of the other end 1002 of the oil guide pipe 1000 are distributed above the driving wheel 221 of the primary gear set 220 and the driven wheel 232 of the secondary gear set 230 of the reducer 200. This improves the utilization rate of the oil, which is beneficial to improving the performance of the oil-cooled power assembly 10.

[0148] In one embodiment, the oil output by the oil guide pipe 1000 is also used to actively lubricate the driving wheel 231 of the secondary gear set 230 of the reducer 200 .

[0149] Continue to refer Fig.15As shown, the wall of the oil guide tube 1000 includes a plurality of oil outlet holes 1004, and each of the plurality of oil outlet holes 1004 is used to output oil to lubricate the driving wheel 231 of the secondary gear set 230. The plurality of oil outlet holes 1004 on the wall of the oil guide tube 1000 can respectively actively lubricate the driving wheel 231 of the secondary gear set 230 of the reducer 200, thereby improving the lubrication effect of the reducer 200, and further facilitating the performance of the oil-cooled power assembly 10.

[0150] In one embodiment, the oil output by the oil guide pipe 1000 is also used to lubricate the bearings of the oil-cooled power assembly 10 , thereby improving the lubrication effect of the reducer 200 , which is beneficial to improving the performance of the oil-cooled power assembly 10 .

[0151] Fig.16 Another schematic diagram of an integrated housing provided in an embodiment of the present application. Fig.16 As shown, the integrated housing 500 further includes two other oil inlets 1005 and 1006, and two bearing grooves 1007 and 1008. One of the two bearing grooves 1007 and 1008 is used to fix a bearing of the transmission shaft 210, and the other of the two bearing grooves 1007 and 1008 is used to fix a bearing of the motor shaft 130. Each of the other two oil inlets 1005 and 1006 is used to communicate with one of the two bearing grooves 1007 and 1008. The oil guide pipe 1000 is also used to output oil to the bearing groove connected to at least one of the other two oil inlets 1005 and 1006 through at least one of the other two oil inlets 1005 and 1006.

[0152] In one embodiment, the distance between the oil inlet 1005 and the bearing groove 1007 is smaller than the distance between the oil inlet 1005 and the bearing groove 1008. The distance between the oil inlet 1006 and the bearing groove 1008 is smaller than the distance between the oil inlet 1006 and the bearing groove 1007. By arranging each of the other two oil inlets 1005 and 1006 close to one of the two bearing grooves 1007 and 1008, the path of the oil path from the oil guide pipe 1000 to each bearing groove can be shortened, thereby improving the lubrication efficiency of the reducer 200, and further facilitating the performance of the oil-cooled power assembly 10.

[0153] Fig.17 A schematic diagram of an oil collecting tank provided in an embodiment of the present application. The oil-cooled power assembly 10 also includes an oil collecting tank 1100, and the reducer groove G2 is also used to accommodate the oil collecting tank 1100. Fig.17As shown, the oil collecting groove 1100 includes a notch 1101 and a groove bottom 1102 arranged relatively, the notch 1101 of the oil collecting groove 1100 is away from the oil outlet 504, and the oil collecting groove 1100 is used to collect the oil in the reducer groove G2. Therefore, the oil collecting groove 1100 can further reduce the oil in the reducer groove G2, reduce the oil stirring loss of the reducer 200, improve the performance of the oil-cooled power assembly 10, and further contribute to the high performance of the oil-cooled power assembly 10.

[0154] Fig.18 Another schematic diagram of an oil-cooled powertrain provided in an embodiment of the present application. In one embodiment, the oil collecting tank 1100 is used to collect the oil leaked from the oil guide pipe 1000. Fig.18 As shown, the oil collecting tank 1100 is distributed between the driving wheel 231 of the secondary gear set 230 and the oil guide pipe 1000. The notch 1101 of the oil collecting tank 1100 faces the oil guide pipe 1000, and the notch 1101 of the oil collecting tank 1100 is used to collect the oil leaked from the oil guide pipe 1000.

[0155] In one embodiment, the bottom 1102 of the oil collecting groove 1100 is an arc wall that is recessed toward the side away from the driving wheel 231 of the secondary gear set 230. Thus, the free space between the driving wheel 231 of the secondary gear set 230 and the oil guide pipe 1000 along the radial direction of the drive motor 100 can be fully utilized, which is conducive to the miniaturization of the oil-cooled power assembly 10.

[0156] Fig.19 Another schematic diagram of the oil collecting tank provided in the embodiment of the present application. In one embodiment, the oil collecting tank 1100 is also used to output oil to actively lubricate the driving wheel 231 of the secondary gear set 230. Fig.19 As shown, the bottom 1102 of the oil collecting tank 1100 includes a plurality of oil outlets 1103, and the plurality of oil outlets 1103 are used to output oil to actively lubricate the driving wheel 231 of the secondary gear set 230. This improves the lubrication effect of the reducer 200, and further helps to improve the performance of the oil-cooled power assembly 10.

[0157] In one embodiment, reference Fig.18 As shown, the multiple oil outlets 1103 of the bottom 1102 of the oil collecting groove 1100 are respectively divided into two groups, and the two groups of oil outlets 1103 are distributed at both ends of the bottom 1102 of the oil collecting groove 1100 along the circumference of the driving motor 100. Therefore, the two groups of oil outlets 1103 can fully actively lubricate the driving wheel 231 of the secondary gear set 230.

[0158] In the embodiment of the present application, the circumferential direction of the drive motor 100 can be understood as the circumferential direction of the motor shaft 130 of the drive motor 100, the circumferential direction of the stator core 111 of the drive motor 100, the circumferential direction of the reducer 200, and the circumferential direction of the oil-cooled power assembly 10.

[0159] In one embodiment, the oil collecting tank 1100 is also used to output oil to lubricate the differential 240. Fig.17 As shown, the oil collecting groove 1100 includes a protrusion 1104, the protrusion 1104 protrudes in the axial direction of the driving motor 100 away from the driven wheel 221 of the primary gear set 220, and the protrusion 1104 includes an oil outlet 1105, and the oil outlet 1105 of the protrusion 1102 is used to output oil to lubricate the differential 240. The oil collecting groove 1100 guides the collected oil to the differential 240 through the oil outlet 1105 on the protrusion 1102, and actively lubricates the differential 240. Thereby, the lubrication effect of the reducer 200 is improved, which is conducive to improving the performance of the oil-cooled power assembly 10.

[0160] In one embodiment, the oil collecting tank 1100 is used to be fixed to the reducer end cover 520. Fig.17 and Fig.18 As shown, the oil collecting tank 1100 includes a plurality of fixed ends 1106 , and the oil collecting tank 1100 is fixed to the reducer end cover 520 via the plurality of fixed ends 1106 .

[0161] In one embodiment, each fixed end 1106 of the oil collecting groove 1100 is distributed on the groove wall of the oil collecting groove 1100 facing the reducer end cover 520. Each fixed end 1106 of the oil collecting groove 1100 includes a fixing hole 1107, and each fixing hole 1107 is used to pass a fixing member to fix the oil collecting groove 1100 and the reducer end cover 520.

[0162] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An oil-cooled powertrain, characterized in that: The housing of the oil-cooled powertrain includes an integrated housing, a motor end cover and a reducer end cover, the integrated housing includes a motor slot and a reducer slot, the motor end cover is used to enclose the motor slot, the reducer end cover is used to enclose the reducer slot, the housing of the oil-cooled powertrain also includes a cooling oil circuit and a lubricating oil circuit, the cooling circuit is used to connect the filter of the oil-cooled powertrain and the heat exchanger of the oil-cooled powertrain, and the lubricating circuit is used to connect the filter, wherein: The oil filtered by the filter is divided into two paths, one path is used to lubricate the reducer accommodated in the reducer groove through the lubricating oil path, and the other path flows into the heat exchanger through the cooling oil path. The oil after heat exchange in the heat exchanger is used to cool at least one of the stator and the rotor of the drive motor accommodated in the motor groove.

2. The oil-cooled powertrain according to claim 1, characterized in that: The integrated housing is also used to fix the heat exchanger, and one end surface of the reducer end cover facing the reducer groove includes an oil outlet, and the oil outlet is used to communicate with the filter through the internal oil passage of the reducer end cover, and one end surface of the integrated housing facing the reducer end cover includes an oil inlet, and the oil inlet is used to communicate with the oil outlet of the reducer end cover and the heat exchanger through the internal oil passage of the integrated housing, wherein: The one oil outlet of the reducer end cover, the internal oil passage of the reducer end cover, the one oil inlet of the integrated housing and the internal oil passage of the integrated housing form the cooling oil circuit.

3. The oil-cooled powertrain according to claim 1 or 2, characterized in that: The inner wall of the reducer end cover includes another oil outlet, and the other oil outlet of the reducer end cover is used to communicate with the filter through the internal oil passage of the reducer end cover, wherein: The other oil outlet of the reducer end cover and the internal oil passage of the reducer end cover form the lubricating oil circuit.

4. The oil-cooled power assembly according to any one of claims 1 to 3, characterized in that: The reducer comprises a transmission shaft, a primary gear set, a secondary gear set and a differential, wherein the primary gear set is used for transmission connection between the transmission shaft and the motor shaft of the drive motor, and the transmission shaft is used for transmission connection with the differential through the secondary gear set, and the reducer slot is also used for accommodating the transmission shaft, the primary gear set, the secondary gear set and the oil guide pipe, wherein: The oil guide pipe surrounds the driving wheel of the secondary gear set, one end of the oil guide pipe is used to connect to the lubricating oil circuit and to receive the oil filtered by the filter through the lubricating oil circuit, and the other end of the oil guide pipe is used to output the oil.

5. The oil-cooled powertrain according to claim 4, characterized in that: The other end of the oil guide pipe comprises two oil outlets, and the directions of the two oil outlets are opposite along the axial direction of the drive motor, wherein: One of the two oil outlets is used to output oil to lubricate the driving wheel of the first-stage gear set, and the other of the two oil outlets is used to output oil to lubricate the driven wheel of the second-stage gear set.

6. The oil-cooled powertrain according to claim 5, characterized in that: The diameter of the driving wheel of the primary gear set is smaller than the diameter of the driven wheel of the secondary gear set, and the distance between the two oil outlets and the central axis of the motor shaft is greater than or equal to the radius of the driven wheel of the secondary gear set.

7. The oil-cooled power assembly according to any one of claims 4 to 6, characterized in that: The wall of the oil guide pipe includes a plurality of oil outlet holes, and each of the plurality of oil outlet holes is used to output oil to lubricate the driving wheel of the secondary gear set.

8. The oil-cooled power assembly according to any one of claims 4 to 7, characterized in that: The integrated housing further comprises two other oil inlets and two bearing grooves, one of the two bearing grooves being used to fix a bearing of the transmission shaft, the other of the two bearing grooves being used to fix a bearing of the motor shaft, and each of the other two oil inlets being used to communicate with one of the two bearing grooves, wherein: The oil guide pipe is also used to output oil to the bearing groove connected to the at least one oil inlet through at least one of the other two oil inlets.

9. The oil-cooled powertrain according to claim 8, characterized in that: The distance between one of the other two oil inlets and the one bearing groove is smaller than the distance between the one oil inlet and the other bearing groove; The distance between another one of the other two oil inlets and the other bearing groove is smaller than the distance between the other one of the oil inlets and the one bearing groove.

10. The oil-cooled power assembly according to any one of claims 4 to 9, characterized in that: The reducer groove is also used to accommodate an oil collecting groove, and the oil collecting groove is distributed between the driving wheel of the secondary gear set and the oil guide pipe, wherein: The notch of the oil collecting groove faces the oil guiding pipe, and the notch of the oil collecting groove is used to collect the oil leaked from the oil guiding pipe.

11. The oil-cooled powertrain according to claim 10, characterized in that: The bottom of the oil collecting tank includes a plurality of oil outlets, and the plurality of oil outlets are used to output oil to lubricate the driving wheel of the secondary gear set.

12. The oil-cooled power assembly according to claim 10 or 11, characterized in that: The oil collecting groove includes a protrusion, the protruding direction of the protrusion is away from the driven wheel of the first-stage gear set along the axial direction of the drive motor, and the protrusion includes an oil outlet, and the oil outlet of the protrusion is used to output oil to lubricate the differential.

13. The oil-cooled power assembly according to any one of claims 1 to 12, characterized in that: The reducer end cover comprises a differential slot and a filter slot, wherein the differential slot is used to accommodate the differential of the reducer, and the filter slot is used to accommodate and fix the filter, wherein: The slot wall of the differential slot protrudes from the side of the reducer end cover away from the reducer slot along the axial direction of the drive motor, and the direction of the notch of the filter slot is the same as the protruding direction of the slot wall of the differential slot.

14. The oil-cooled power assembly according to any one of claims 1 to 13, characterized in that: The motor slot includes an oil outlet, the oil outlet of the motor slot is used to communicate with the heat exchanger through the internal oil passage of the integrated housing, the oil outlet of the motor slot is used to receive the oil after heat exchange by the heat exchanger through the internal oil passage of the integrated housing and to output the oil to cool the stator of the drive motor; One end surface of the motor end cover facing the motor slot includes an oil inlet, and the oil inlet of the motor end cover is used to communicate with the internal oil passage of the motor end cover. One end surface of the integrated housing facing the motor end cover includes an oil outlet, and the oil outlet of the integrated housing is used to communicate with the oil inlet of the motor end cover and to communicate with the heat exchanger through the internal oil passage of the integrated housing, wherein: The oil after heat exchange by the heat exchanger is used to flow into the shaft cavity of the motor shaft of the drive motor through the internal oil channel of the integrated housing, the one oil outlet of the integrated housing, the one oil inlet of the motor end cover, and the internal oil channel of the motor end cover to cool the rotor of the drive motor.

15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism and an oil-cooled powertrain as claimed in any one of claims 1 to 14, wherein the oil-cooled powertrain is used to drive the two front wheels or the two rear wheels through two half-axles respectively.

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