Oil cooling motor, power assembly and vehicle

Abstract

The invention provides an oil cooling motor, a power assembly and a vehicle. The oil cooling motor comprises a stator and a rotor, a rotor shaft sequentially penetrates through a first end plate, a rotor iron core and a second end plate in the circumferential direction of the oil cooling motor, an oil cooling loop of the rotor comprises an oil inlet channel and a plurality of oil outlets, the oil inlet channel is distributed in the rotor shaft, and the oil outlets comprise a plurality of first oil outlets and a plurality of second oil outlets; the multiple first oil outlets are distributed in the side, away from the rotor iron core, of the first end plate at intervals in the circumferential direction of the oil-cooled motor, and the multiple second oil outlets are distributed in the side, away from the rotor iron core, of the second end plate at intervals in the circumferential direction of the oil-cooled motor. At least one of the area of each first oil outlet and the area of each second oil outlet or the distance between each first oil outlet and the inner circumferential face of the stator and the distance between each second oil outlet and the inner circumferential face of the stator in the radial direction of the oil cooling motor is different. Cooling oil in different states can be sprayed out of the two ends of the rotor of the oil-cooled motor to meet different oil cooling requirements of the two ends of the stator winding.

Description

Technical Field

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

[0002] With the development of new energy vehicles, the motors in the vehicle's powertrain are developing towards high speed, high density and miniaturization.

[0003] At present, the rotor of the motor can be cooled by oil by passing cooling oil into the rotor. Specifically, the cooling oil enters the oil path inside the rotor and flows to both ends of the rotor and sprays out as the rotor rotates. The cooling oil sprayed on both sides of the rotor can be sprayed for oil cooling at both ends of the stator winding. The end winding structures of the stator winding at both ends of the motor along the axial direction are different, and the cooling requirements are also different. The rotor oil spraying method in the prior art cannot meet the requirements. Summary of the invention

[0004] The present application provides an oil-cooled motor, a powertrain and a vehicle. The two ends of the rotor of the oil-cooled motor can spray cooling oil in different states to perform oil cooling and heat dissipation on the end windings of the stator, thereby meeting the different oil cooling requirements at the two ends of the stator windings.

[0005] In a first aspect, an embodiment of the present application provides an oil-cooled motor, which includes a stator and a rotor, wherein the center hole of the stator is used to accommodate the rotor, and the rotor includes a rotor shaft, a rotor core, a first end plate, and a second end plate, wherein the rotor shaft passes through the first end plate, the rotor core, and the second end plate in sequence along the circumference of the oil-cooled motor, and the oil cooling circuit of the rotor includes: an oil inlet channel and a plurality of oil outlets, wherein the oil inlet channel is distributed inside the rotor shaft, and the oil inlet channel is used to transport cooling oil to the inside of the rotor core; the plurality of oil outlets are used to discharge the cooling oil inside the rotor, and the plurality of oil outlets include a plurality of first oil outlets and a plurality of second oil outlets; wherein the plurality of first oil outlets are distributed at intervals along the circumference of the oil-cooled motor on a side of the first end plate away from the rotor core, and the plurality of second oil outlets are distributed at intervals along the circumference of the oil-cooled motor on a side of the second end plate away from the rotor core, and at least one of the areas of each first oil outlet and each second oil outlet or the distances between each first oil outlet and each second oil outlet and the inner circumferential surface of the stator along the radial direction of the oil-cooled motor is different.

[0006] In the above oil-cooled motor, the oil outlets at the two ends of the rotor have different structures, and the cooling oil of the rotor has different spraying states when spraying out at the two ends, thereby meeting the different heat dissipation requirements of the two ends of the stator winding and improving the heat dissipation efficiency of the oil-cooled motor. The different oil discharge states at the two ends of the rotor include at least one of oil quantity, direction, distance, and angle.

[0007] In one embodiment, along the radial direction of the oil-cooled motor, the distance between each first oil outlet and the outer peripheral surface of the rotor is smaller than the distance between each second oil outlet and the outer peripheral surface of the rotor. When the rotor rotates at high speed, the cooling oil in the rotor is concentrated toward the outer peripheral side of the rotor due to the centripetal force during the circulation process. The different radial distances between the oil outlet and the outer peripheral surface of the stator can affect the order and amount of cooling oil entering the oil outlet, thereby changing the oil injection state at both ends of the rotor.

[0008] In one embodiment, the area of ​​each first oil outlet is greater than the area of ​​each second oil outlet. Different areas of the oil outlets will affect the oil output and flow rate of the cooling oil, thereby changing the oil injection state at both ends of the rotor.

[0009] In one embodiment, the oil cooling circuit of the rotor further includes a plurality of radial flow channels and a plurality of axial flow channels, each radial flow channel is used to connect the oil inlet channel and an axial flow channel, wherein: along the axial direction of the oil-cooled motor, the distance between each radial flow channel and the first oil outlet is greater than the distance between each radial flow channel and the second oil outlet. The radial flow channel supplies cooling oil to both ends of the rotor for different lengths of time, which can change the amount of oil flowing to both ends of the rotor, thereby changing the oil injection state at both ends of the rotor.

[0010] In one embodiment, the rotor core includes a first core end face and a second core end face that are opposite to each other in the axial direction of the oil-cooled motor, and each axial flow channel includes a first opening and a second opening that are opposite to each other in the axial direction of the oil-cooled motor, and the first opening of each axial flow channel is distributed on the first core end face, and the second opening of each axial flow channel is distributed on the second core end face. Wherein: each first opening is used to discharge cooling oil through a first oil outlet, and the distance between each first opening and the outer peripheral surface of the rotor is greater than the distance between each first oil outlet and the outer peripheral surface of the rotor. There is a height difference between the first opening and the first oil outlet along the radial direction of the oil-cooled motor, which facilitates the cooling oil inside the rotor to flow to the first oil outlet.

[0011] In one embodiment, each radial flow channel is used to deliver cooling oil to a second opening and a second oil outlet, wherein the distance between each second opening and the outer peripheral surface of the rotor is less than or equal to the distance between the axis of each second oil outlet and the outer peripheral surface of the rotor, and the cooling oil inside the rotor is more likely to flow to the first oil outlet, thereby adjusting the state of oil spraying at both ends of the rotor.

[0012] In one embodiment, the area of ​​each first oil outlet is greater than or equal to the area of ​​each first opening, and the area of ​​each second oil outlet is less than the area of ​​each second opening. The different areas of the first oil outlet and the second oil outlet will affect the different oil injection amounts at both ends of the rotor.

[0013] In one embodiment, the rotor core further includes a plurality of auxiliary flow channels, each of which includes an inlet and an outlet, wherein: the inlets of the plurality of auxiliary flow channels are spaced apart along the circumference of the oil-cooled motor on the second core end face, the inlet of each auxiliary flow channel is spaced apart along the radial direction of the oil-cooled motor and is used to connect to the same radial flow channel, and the area of ​​the inlet of each auxiliary flow channel is smaller than the area of ​​the second opening of each axial flow channel; the outlets of the plurality of auxiliary flow channels are spaced apart along the circumference of the oil-cooled motor on the first core end face, the outlet of each auxiliary flow channel is spaced apart along the radial direction of the oil-cooled motor and is used to connect to the same first oil outlet, and the area of ​​the outlet of each auxiliary flow channel is smaller than the area of ​​the first opening of each axial flow channel. The plurality of auxiliary flow channels and the plurality of axial flow channels are connected in parallel as part of the oil cooling circuit of the rotor, which can improve the oil cooling effect of the rotor.

[0014] In one embodiment, the second end plate includes a plurality of radial grooves on the side facing the rotor core, each radial groove is used as a radial flow channel, and the plurality of radial grooves are arranged at intervals along the circumference of the oil-cooled motor, and each radial groove is used to connect an axial flow channel and a second oil outlet. In the radial direction of the oil-cooled motor, the distance between each radial groove and the outer peripheral surface of the rotor is smaller than the distance between the second oil outlet and the outer peripheral surface of the rotor, and the distance between the axial flow channel and the outer peripheral surface of the rotor. The cooling oil in the radial flow channel can be partially stored in the radial groove under the action of the centripetal force, changing the oil distribution of the cooling oil to the second oil outlet and the axial flow channel, thereby changing the state of oil injection at both ends of the rotor.

[0015] In one embodiment, along the circumference of the oil-cooled motor, the circumferential width of each radial groove is greater than the circumferential width of the connected second oil outlet and less than the circumferential width of the second opening of the axial flow channel. The amount of cooling oil in the radial groove can ensure the supply to the axial flow channel and the second oil outlet.

[0016] In one embodiment, the second end plate further includes an annular groove on the side facing the rotor core, and the annular groove is used to surround and connect multiple radial grooves. The annular groove can receive the cooling oil delivered by the radial flow channel and allow the cooling oil to flow along the circumference of the oil-cooled motor, uniformly cool the oil in the circumference, prevent the rotor from generating local hot spots, and help improve the stability of the rotor and optimize the performance of the oil-cooled motor. Among them, along the radial direction of the oil-cooled motor, the distance between the annular groove and the outer peripheral surface of the rotor is less than or equal to the distance between each second oil outlet and the outer peripheral surface of the rotor, and less than the distance between the second opening of the axial flow channel and the outer peripheral surface of the rotor, so that the annular groove plays the function of storing cooling oil, ensuring the annular groove supplies cooling oil to the axial flow channel and the second cooling hole.

[0017] In one embodiment, the side of the first end plate facing the rotor core includes a plurality of first oil inlets, and the side of the second end plate facing the rotor core includes a plurality of second oil inlets, each first oil inlet is used to connect to a first oil outlet, and each second oil inlet is used to connect to a second oil outlet, wherein: the area of ​​each first oil inlet is larger than the area of ​​each second oil inlet, so that the amount of cooling oil reaching the first oil outlet and the second oil outlet is different.

[0018] In one embodiment, the distance between each first oil inlet and the outer peripheral surface of the rotor is greater than or equal to the distance between each first oil outlet and the outer peripheral surface of the rotor. By adjusting the structure of the connected first oil inlet and the first oil outlet, the angle and direction of the cooling oil sprayed from the first oil outlet can be changed. The distance between each second oil inlet and the outer peripheral surface of the rotor is greater than or equal to the distance between each second oil outlet and the outer peripheral surface of the rotor. By adjusting the structure of the second oil outlet and the second oil inlet, the angle and direction of the cooling oil sprayed from the first oil outlet can be changed.

[0019] In a second aspect, an embodiment of the present application further provides a power assembly, which includes a reducer and any one of the oil-cooled motors provided in the first aspect above, wherein the rotor shaft of the oil-cooled motor is drivingly connected to the input shaft of the reducer, wherein the reducer can be replaced by a transmission.

[0020] In a third aspect, the present application also provides an electric vehicle, which includes wheels and the powertrain provided in the second aspect, wherein the oil-cooled motor is connected to the wheel through a transmission mechanism, so that the driving force can be further transmitted to the wheel to drive the electric vehicle.

[0021] For the technical effects that can be achieved by the above-mentioned second and third aspects, please refer to the description of the technical effects that can be achieved by the corresponding design scheme in the above-mentioned first aspect, and this application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0024] Figure 3 A schematic cross-sectional structure diagram of an oil-cooled motor provided in an embodiment of the present application;

[0025] Figure 4a A schematic structural diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0026] Figure 4b An exploded diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0027] Figure 4c An exploded diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0028] Figure 5a A schematic structural diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0029] Figure 5b An exploded diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0030] Figure 6a A schematic cross-sectional view of a portion of the structure of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0031] Figure 6b A schematic cross-sectional view of a portion of the structure of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0032] Figure 7 A schematic cross-sectional view of a portion of the structure of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0033] Figure 8 A schematic cross-sectional view of a portion of the structure of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0034] Fig. 9 A schematic cross-sectional view of a portion of the structure of an oil-cooled motor provided in an embodiment of the present application; Fig.10a A schematic structural diagram of a second end plate of an oil-cooled motor provided in an embodiment of the present application;

[0035] Fig.10b A schematic cross-sectional structure diagram of a second end plate of an oil-cooled motor provided in an embodiment of the present application;

[0036] Fig.11a A schematic cross-sectional structure diagram of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0037] Fig.11b A schematic cross-sectional view of a partial structure of an oil-cooled motor provided in an embodiment of the present application;

[0038] Fig.12 A schematic structural diagram of a second end plate of an oil-cooled motor provided in an embodiment of the present application;

[0039] Fig.13 A schematic cross-sectional view of a portion of the structure of a rotor of an oil-cooled motor provided in an embodiment of the present application;

[0040] Fig.14a A schematic diagram of the structure of a rotor punching sheet and a magnetic steel of an oil-cooled motor provided in an embodiment of the present application;

[0041] Fig.14b A schematic diagram of the structure of rotor punchings and magnetic steel of an oil-cooled motor provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 1000-powertrain; 2000-transmission mechanism; 3000-wheel;

[0044] 100-oil-cooled motor; 200-motor controller; 300-reducer;

[0045] 10-rotor; 20-stator; 201-stator core; 202-stator winding; 30-housing;

[0046] 1-rotor shaft; 11-oil inlet channel; 12-annular shoulder; 2-rotor core; 21-rotor punching; 211-cooling hole; 212-mounting hole; 213-auxiliary cooling hole; 22-magnetic steel; 3-end plate; 3a-first end plate; 3b-second end plate; 31-oil outlet; 31a-first oil outlet; 31b-second oil outlet; 32a-first oil inlet; 32b-second oil inlet; 4-fixing member; 4a-first fixing member; 4b-second fixing member; 5-rotor sleeve;

[0047] a1-first core end face; a2-second core end face; d11-axial channel; d12-radial channel; d21-axial flow channel; d22-radial flow channel; d23-auxiliary axial flow channel; d31-first oil outlet channel; d32-second oil outlet channel; d33-radial groove; d34-annular groove; k1-first center hole; k2-second center hole; t1-axial groove; t2-axial protrusion. DETAILED DESCRIPTION

[0048] In an oil-cooled motor, the cooling oil introduced into the rotor can be sprayed out from the two axial ends of the rotor to perform oil spray cooling on the stator winding. The two ends of the stator winding have different requirements for cooling oil.

[0049] Based on this, an embodiment of the present application provides an oil-cooled motor, a powertrain and a vehicle, wherein the rotor of the oil-cooled motor can adjust the oil output state on both sides of the axial direction to meet the cooling requirements of the oil-cooled motor and improve the efficiency of the oil-cooled motor.

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0051] Figure 1 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application is shown in FIG. Figure 1As shown, the electric vehicle is a wheeled device driven or towed by a power device, and can be specifically a pure electric vehicle (pure electric vehicle / battery electric vehicle, pure EV / battery EV), a hybrid electric vehicle (hybrid electric vehicle, HEV), a range extended electric vehicle (range extended electric vehicle, REEV) or a plug-in hybrid electric vehicle (plug-in hybrid electric vehicle, PHEV), etc. The vehicle includes a powertrain 1000, a transmission mechanism 2000 and a wheel 3000. The powertrain 1000 drives the wheel 3000 through the transmission mechanism 2000. Among them, the powertrain 1000 is used to convert electrical energy into mechanical energy. The transmission mechanism 2000 is used to transmit and connect the powertrain 1000 and the wheel 3000. Of course, the vehicle also includes a frame that withstands the internal and external environmental loads of the vehicle and a battery for supplying power to the powertrain 1000.

[0052] Figure 2 This is a schematic diagram of the structure of the powertrain 1000 provided in the embodiment of the present application. Figure 2 As shown, the powertrain 1000 includes a motor 100 and a motor controller 200. The motor controller 200 is used to convert the direct current provided by the battery into alternating current, and transmit the alternating current to the oil-cooled motor 100. In one embodiment, the powertrain 1000 also includes a reducer 300, and the power output end of the oil-cooled motor 100 is connected to the wheel 3000 of the vehicle through the reducer 300. The reducer 300 can also be called a transmission. The oil-cooled motor 100 of the electric vehicle is usually a permanent magnet synchronous or AC asynchronous motor.

[0053] Figure 3 FIG. 1 is a schematic diagram of a cross-sectional structure of an oil-cooled motor 100. Figure 3As shown, the oil-cooled motor 100 includes a rotor 10, a stator 20 and a housing 30, and the stator 20 and a part of the rotor 10 are accommodated in the housing 30. The rotor 10 includes a rotor shaft 1 and a rotor core 2, and the rotor core 2 is coaxially fixed to the rotor shaft 1. One end of the rotor shaft 1 is rotatably mounted on the housing 30, and the other end extends out of the housing 30 for transmission connection with the reducer 300. The rotor shaft 1 can also be considered as the motor shaft of the oil-cooled motor 100. The stator 20 is sleeved outside the rotor core 2, and the stator 20 includes a stator core 201 and a stator winding 202 wound on the stator core 201. When the stator winding 202 is energized, a magnetic field can be formed in the center hole of the stator core 201, and the rotor 10 can rotate around the axis of the rotor shaft 1 in the magnetic field. Among them, the stator winding 202 includes an end winding protruding from the axial end surface of the stator core 201. Along the axial direction of the oil-cooled motor 100, the end winding of one end of the stator winding 202 is the cross-line end, and the end winding of the other end is the connection terminal. The connection terminal of the stator winding 202 is used to connect three-phase electricity, and the structure of the connection terminal is different from that of the cross-line segment.

[0054] The rotor 10 provided in the embodiment of the present application includes an oil cooling circuit inside. Cooling oil is introduced into the oil cooling circuit inside the rotor 10 to perform liquid cooling and heat dissipation on the rotor 10. Finally, the cooling oil can be sprayed out from the two axial ends of the rotor 10. Figure 3 As shown by the dotted arrows in the figure, the cooling oil sprayed from the two axial ends of the rotor 10 can spray and dissipate heat for the two end windings of the stator winding 202. In view of the different structures of the two end windings of the stator winding 202, the rotor 10 provided in the embodiment of the present application has a differentiated design of the oil spraying ports at both ends to adjust the state of the cooling oil sprayed from the two ends of the rotor 10 to meet the different liquid cooling needs of the two end windings, so as to improve the cooling efficiency of the oil-cooled motor 100, thereby improving the performance of the oil-cooled motor 100.

[0055] In the embodiment of the present application, the axial direction of the oil-cooled motor, the axial direction of the rotor core, and the axial direction of the rotor shaft refer to the same direction, the circumferential direction of the oil-cooled motor, the circumferential direction of the rotor core, and the circumferential direction of the rotor shaft refer to the same direction, and the radial direction of the oil-cooled motor, the radial direction of the rotor core, and the radial direction of the rotor shaft refer to the same direction. For ease of understanding, the axial direction of the oil-cooled motor 100 is represented by the letter A, and the radial direction of the oil-cooled motor 100 is represented by the letter R.

[0056] Figure 4a The structure of the rotor 10 in one embodiment provided in the present application is as follows: Figure 4b The structure of the rotor 10 can be combined with Figure 4a and Figure 4b understand.

[0057] like Figure 4aAs shown, the rotor 10 includes a rotor shaft 1, a rotor core 2, and two end plates 3. Along the axial direction of the oil-cooled motor, the two end plates 3 are arranged on both sides of the rotor core 2, and the rotor shaft 1 can pass through one end plate 3, the rotor core 2, and the other end plate 3 in sequence. The rotor core 2 and the two end plates 3 can be fixed to the rotor shaft 1 by keyway matching. One end of the rotor shaft 1 is a power output end S, which is used for transmission connection to a reducer.

[0058] In some embodiments, the oil cooling circuit of the rotor 10 includes an oil inlet channel 11 and a plurality of oil outlets 31. The oil inlet channel 11 is distributed inside the rotor shaft 1, and the oil inlet channel 11 is used to transport cooling oil to the inside of the rotor core 2. The plurality of oil outlets 31 are used to discharge the cooling oil inside the rotor 10. The plurality of oil outlets 31 are oil injection ports at both ends of the rotor 10 for oil injection.

[0059] Combination Figure 4b and Figure 4c As shown, for the convenience of description, of the two end plates 3, the end plate 3 close to the power output end S is set as the second end plate 3b, and the end plate 3 away from the power output end S is set as the first end plate 3a. In one embodiment, the above-mentioned multiple oil outlets include multiple first oil outlets 31a and multiple second oil outlets 31b, and the multiple first oil outlets 31a and the multiple second oil outlets 31b are respectively used to discharge oil from the two ends of the rotor 10. Among them, each first oil outlet 31a and each second oil outlet 31b are different, so that the cooling oil of the rotor 10 has different injection states when it is sprayed at both ends, thereby meeting the different heat dissipation requirements of the two ends of the stator winding 202 and improving the heat dissipation efficiency of the oil-cooled motor 100. The injection state here includes at least one of the states of flow rate, direction, injection rate, injection distance, injection angle, etc.

[0060] In one embodiment, the plurality of first oil outlets 31a are spaced apart along the circumferential direction of the oil-cooled motor on the side of the first end plate 3a away from the rotor core 2, and the plurality of second oil outlets 31b are spaced apart along the circumferential direction of the oil-cooled motor on the side of the second end plate 3b away from the rotor core 2. The cooling oil in the rotor 10 can be sprayed out from the side of the first end plate 3a away from the rotor core 2 through the plurality of first oil outlets 31a, and the cooling oil in the rotor 10 can be sprayed out from the side of the second end plate 3b away from the rotor core 2 through the plurality of second oil outlets 31b.

[0061] In some embodiments, the area of ​​each first oil outlet 31a is different from the area of ​​each second oil outlet 31b. The area of ​​the orthographic projection of a first oil outlet 31a on the rotor core 2 along the axial direction of the oil-cooled motor is the area of ​​the first oil outlet 31a, and the area of ​​the orthographic projection of a second oil outlet 31b on the rotor core 2 along the axial direction of the oil-cooled motor is the area of ​​the second oil outlet 31b. The area of ​​each first oil outlet 31a is different from the area of ​​each second oil outlet 31b, which will affect the oil output and flow rate of the cooling oil, thereby changing the oil injection state at both ends of the rotor 10.

[0062] In some embodiments, the distance between each first oil outlet 31a and the inner circumference of the stator 20 along the radial direction of the oil-cooled motor is different from the distance between each second oil outlet 31b and the inner circumference of the stator 20 along the radial direction of the oil-cooled motor. With the inner circumference of the stator 20 as a reference, when the rotor 10 rotates at high speed, the cooling oil in the rotor 10 is concentrated toward the outer circumference of the rotor 10 due to the centripetal force during the circulation process. The distance between each first oil outlet 31a and the inner circumference of the stator 20 along the radial direction of the oil-cooled motor is different from the distance between each second oil outlet 31b and the inner circumference of the stator 20 along the radial direction of the oil-cooled motor, which can affect the order and amount of the cooling oil in the rotor 10 entering the first oil outlet 31a and the second oil outlet 31b, thereby changing the oil injection state at both ends of the rotor 10.

[0063] Of course, based on the basic structure of the oil-cooled motor 100 provided in the embodiment of the present application, adaptive changes to any one or more structures in the cooling oil circuit can change the oil outlet state at both ends of the rotor 10, thereby meeting the different cooling requirements at both ends of the stator winding 202. The above-mentioned differentiated design solutions for the first oil outlet 31a and the second oil outlet 31b provided in the embodiment of the present application are only exemplary descriptions of two of the solutions, and the above-mentioned two solutions can be implemented separately or in combination, and can also be implemented in combination with at least one other structural improvement of the rotor core 2 and the two end plates 3, so as to finally meet the different requirements for the oil outlet state at both ends of the rotor 10.

[0064] In some embodiments, the rotor core 2 and the first end plate 3a and the second end plate 3b are fixed to the rotor shaft 1 along the axial direction of the oil-cooled motor by two fixing members 4, one of which is arranged along the axial direction of the oil-cooled motor on the side of the first end plate 3a away from the rotor core 2, and the other fixing member 4 is arranged along the axial direction of the oil-cooled motor on the side of the second end plate 3b away from the rotor core 2. The two fixing members 4 can limit and fix the rotor core 2 and the first end plate 3a and the second end plate 3b along the axial direction of the oil-cooled motor. As a specific example, in combination with Figure 4b and Figure 4cAs shown, one of the fixing members 4 is a first fixing member 4a, which is arranged along the axial direction of the oil-cooled motor on the side of the first end plate 3a away from the rotor core 2. The other fixing member 4 is a second fixing member 4b, which is arranged along the axial direction of the oil-cooled motor on the side of the second end plate 3b away from the rotor core 2.

[0065] In one embodiment, along the radial direction of the oil-cooled motor, the distance between the outer diameter of the first fixing member 4a and the axis of the rotor 10 is less than or equal to the distance between the first oil outlet hole 31a and the axis of the rotor 10, and the first fixing member 4a will not block the first oil outlet hole 31a, ensuring that the cooling oil can be smoothly sprayed out from the first oil outlet hole 31a. Similarly, along the radial direction of the oil-cooled motor, the distance between the outer diameter of the second fixing member 4b and the axis of the rotor 10 is less than or equal to the distance between the second oil outlet hole 31b and the axis of the rotor 10, and the second fixing member 4b will not block the second oil outlet hole 31b, ensuring that the cooling oil can be smoothly sprayed out from the second oil outlet hole 31b.

[0066] In one embodiment, the first fixing member 4a is an annular structure member, and the annular structure member is used to be fitted on the rotor shaft 1 through friction force to achieve fixation.

[0067] In one embodiment, the second fixing member 4b is a part of the rotor shaft 1 and has an integral structure with the rotor shaft 1. Specifically, the second fixing member 4b is an annular shoulder protruding from the outer peripheral surface of the rotor shaft 1.

[0068] In some embodiments, please refer to Figure 4b and Figure 4c As shown, the rotor core 2 includes a plurality of rotor punchings 21 and a plurality of magnetic steel groups 22 assembled on the plurality of rotor punchings 21, and the plurality of magnetic steel groups 22 are arranged at intervals along the circumference of the oil-cooled motor to form a magnetic field, which is used to couple with the magnetic field formed by the stator winding 202, thereby driving the rotor 10 to rotate. The plurality of rotor punchings 21 are adjacently arranged along the axial direction of the oil-cooled motor to form a cylindrical main structure of the rotor core 2. Each rotor punching 21 includes a plurality of cooling holes 211, and the cooling holes 211 included in the plurality of rotor punchings 21 can be connected according to a set path to form a channel for the circulation of cooling oil.

[0069] In one embodiment, each rotor punching 21 includes a first center hole k1 that penetrates the rotor punching 21 along the axial direction of the oil-cooled motor, and the first center hole k1 is used for the rotor shaft 1 to pass through and fix. The first center holes k1 of multiple rotor punchings 21 are connected in sequence along the axial direction of the oil-cooled motor to form a channel for the rotor shaft 1 to pass through. The first end plate 3a includes a second center hole k2 that penetrates the end plate 3 along the axial direction of the oil-cooled motor, and the second end plate 3b includes a second center hole k2 that penetrates the end plate 3 along the axial direction of the oil-cooled motor, and each second center hole k2 is used for the rotor shaft 1 to pass through. Similarly, the first fixing member 4a includes a third center hole k3 that penetrates the first fixing member 4a along the axial direction of the oil-cooled motor, and the third center hole k3 is also used for the rotor shaft 1 to pass through. The inner circumference of each first center hole k1 and each second center hole k2 includes an axial protrusion t2, and the outer circumference of the rotor shaft 1 includes an axial groove t1. The circumferential length of the axial protrusion t2 along the circumference of the oil-cooled motor is less than the circumferential length of the axial groove t1, and the radial height of the axial protrusion t2 along the radial direction of the oil-cooled motor is less than the radial height of the axial groove t1. Along the axial direction of the oil-cooled motor, the axial length of the axial groove t1 is greater than the overall axial length of the stacked rotor sheets 21, and the axial groove t1 is used to accommodate the axial protrusions t2 of the multiple rotor sheets 21. When the multiple rotor sheets 21 are driven by the magnetic field formed by the stator winding 202, the rotation of the multiple rotor sheets 21 can be transmitted to the rotor shaft 1 through the keyway of the axial protrusion t2 and the axial groove t1, thereby driving the rotor shaft 1 to rotate, and finally outputting power from the power output end S.

[0070] In some embodiments, the fit between each rotor punching sheet 21 and the rotor shaft 1 can be achieved by two sets of keyway structures. Specifically, the inner circumferential surface of the first center hole k1 of each rotor punching sheet 21 includes two axial protrusions t2, and the two axial protrusions t2 are arranged at intervals along the circumference of the oil-cooled motor. Correspondingly, the outer circumferential surface of the rotor shaft 1 includes two axial grooves t1, and the two axial grooves t1 are arranged at intervals along the circumference of the oil-cooled motor. Each axial groove t1 is used to accommodate an axial protrusion t2 of each rotor punching sheet 21 along the axial direction of the oil-cooled motor, strengthen the radial fit between the rotor punching sheet 21 and the rotor shaft 1, and also help to balance the circumferential stress distribution of the rotor 10 during rotation. In one embodiment, the two axial protrusions t2 of each rotor punching sheet 21 are arranged symmetrically with reference to the axial direction of the oil-cooled motor 100, and correspondingly, the two axial grooves t1 of the rotor shaft 1 are arranged symmetrically with reference to the axial direction of the oil-cooled motor 100.

[0071] In one embodiment, the axial groove t1 of the rotor shaft 1 is also used to accommodate a portion of the axial protrusion t2 of the first end plate 3a and a portion of the axial protrusion t2 of the second end plate 3b, so that the rotor shaft 1 can drive the two end plates 3 to rotate together, and the two end plates 3 maintain synchronous rotation with the multiple rotor punchings 21.

[0072] Combination Figures 4a to 4c As shown, when the rotor 10 is assembled, the second end plate 3b, the plurality of rotor punchings 21, and the first end plate 3a are sleeved on the outer peripheral surface of the rotor shaft 1 along the axial direction of the oil-cooled motor, and the outer peripheral surface of the rotor shaft 1 is respectively matched with the first center hole k1 of each rotor punching 21 and the second center hole k2 of each end plate 3, and the axial protrusion t2 of each first center hole k1 and the axial protrusion t2 of each second center hole k2 can be embedded in the axial groove t2 of the rotor shaft 1 along the axial direction of the oil-cooled motor. After the plurality of rotor punchings 21 and the two end plates 3 are assembled, the side of the second end plate 3b away from the plurality of rotor punchings 21 abuts against the second fixing member 4b. The first fixing member 4a is sleeved on the side of the rotor shaft 1 away from the power output end S along the axial direction of the oil-cooled motor, and the first fixing member 4a is pressed and fixed on the side of the first end plate 3a away from the plurality of rotor punchings 21, and the first fixing member 4a and the second fixing member 4b provide axial limit for the plurality of stator punchings 21 and the two end plates 3 along the axial direction of the oil-cooled motor.

[0073] The rotor punching sheet 21 is generally a steel sheet, and the outer surface of the outer peripheral surface of the combination of multiple rotor punching sheets 21 is relatively smooth. Figure 5a and Figure 5b As shown, the rotor 10 further includes a rotor sleeve 5 sleeved on the outer circumference of the rotor core 2. In one embodiment, the rotor sleeve 5 is wrapped around the rotor core 2 along the circumferential direction of the oil-cooled motor. Along the axial direction of the oil-cooled motor, the axial length of the rotor sleeve 5 is greater than the axial length of the rotor core 2, and the two end portions of the rotor sleeve 5 are sleeved on the outer circumferential surfaces of the first end plate 3a and the second end plate 3b.

[0074] In one embodiment, the rotor sleeve 5 is made of carbon fiber, and the rotor sleeve 5 includes a plurality of carbon fibers, which are wound around the outer peripheral surface of the combined structure of a plurality of rotor punchings 21 to form a carbon fiber sleeve. Carbon fiber wound around the outer peripheral surface of the combined structure of a plurality of rotor punchings 21 can better average the stress of the carbon fiber on the rotor 10 and improve the life of the rotor 10. The carbon fiber sleeve can also enhance the sealing effect on the outer peripheral surface of the rotor 10, prevent the cooling oil in the cooling channel in the rotor core 2 from leaking to the outer periphery of the rotor 10 and entering between the stator 20 and the rotor 10, reduce the friction loss of the rotor 10, and improve the reliability of the oil-cooled motor 100. In one embodiment, the distance between each first oil outlet 31a and the outer peripheral surface of the rotor 10 is smaller than the distance between each second oil outlet 31b and the outer peripheral surface of the rotor 10. When the rotor 10 rotates, the cooling oil in the rotor 10 will be concentrated on one side of the outer peripheral surface of the rotor 10 due to the centripetal force, and the cooling oil in the rotor 10 will more easily enter the first oil outlet 31a. The first oil outlet 31a has a higher priority than the second oil outlet 31b in the order of receiving the cooling oil in the rotor core 2, so that the oil outlet states at both ends of the rotor 10 are different. Figure 6aThe schematic diagram of the partial cross-sectional structure of the rotor 10 is shown, the distance between the first oil outlet 31a and the outer peripheral surface of the rotor 10 is h11, the distance between the second oil outlet 31b and the outer peripheral surface of the rotor 10 is h21, and h11 is smaller than h21. It can be considered that the first oil outlet 31a is closer to the outer peripheral surface of the rotor 10 than the second oil outlet 31b.

[0075] It should be understood that the outer circumference of the rotor 10 may have different outer diameters. The reference for comparing the first oil outlet 31a and the second oil outlet 31b is the outer circumference of the rotor 10 at the same position, and the outer circumference of the rotor 10 at this position is parallel to the inner circumference of the stator 20. In the subsequent embodiments, when the outer circumference of the rotor 10 is used as a reference for distance comparison, it is the outer circumference of the rotor 10 at the same position and with the same radial size.

[0076] like Figure 6a As shown, in one embodiment, the first end plate 3a includes a plurality of first oil inlets 32a on the side facing the rotor core 2, and the second end plate 3b includes a plurality of second oil inlets 32b on the side facing the rotor core 2, each first oil inlet 32a is used to connect to a first oil outlet 31a, and each second oil inlet 32b is used to connect to a second oil outlet 31b. For ease of understanding, the first end plate 3a includes a first oil outlet channel d31 connecting the first oil outlet 31a and the first oil inlet 32a, and the first oil outlet channel d31 connects the two end surfaces of the first end plate 3a. The second end plate 3b includes a second oil outlet channel d32 connecting the second oil outlet 31b and the second oil inlet 32b, and the second oil outlet channel d32 connects the two end surfaces of the second end plate 3b. The cooling oil in the rotor core 2 can pass through the first oil outlet channel d31 and then be sprayed out through the first oil outlet 31a, and the cooling oil in the rotor core 2 can pass through the second oil outlet channel d32 and then be sprayed out through the second oil outlet 31b.

[0077] In one embodiment, the area of ​​each first oil inlet 32a is larger than the area of ​​each second oil inlet 32b, so the amount of cooling oil in the rotor 10 entering the first oil inlet 32a will be greater than the amount of oil entering the second oil inlet 32b, thereby affecting the oil outlet state of the first oil outlet 31a and the second oil outlet 31b.

[0078] In one embodiment, Figure 6aAs shown, along the radial direction of the oil-cooled motor, the distance h12 between each first oil inlet 32a and the outer peripheral surface of the rotor 10 is equal to the distance h11 between each first oil outlet 31a and the outer peripheral surface of the rotor 10. When the rotor 10 rotates, the cooling oil is concentrated to the side of the first oil outlet channel d31 close to the outer peripheral surface of the rotor 10 due to the centripetal force, and the direction in which the cooling oil flows from the first oil inlet 32a to the first oil outlet 31a is parallel to the axial direction of the oil-cooled motor. Taking the first oil outlet channel d31 as a reference, the axis of the first oil outlet channel d31 is parallel to the axial direction of the oil-cooled motor, and the spraying direction of the cooling oil derived from the first oil outlet channel d31 can be limited, so that the direction of the cooling oil sprayed from the first oil outlet 31a is parallel to the axial direction of the oil-cooled motor.

[0079] Similarly, the distance h22 between each second oil inlet 32b and the outer peripheral surface of the rotor 10 is equal to the distance h21 between each second oil outlet 31b and the outer peripheral surface of the rotor 10. When the rotor 10 rotates, the cooling oil is concentrated on the side of the second oil outlet channel d32 close to the outer peripheral surface of the rotor 10 due to the centripetal force, and the direction in which the cooling oil flows from the second oil inlet 32b to the second oil outlet 31b is parallel to the axial direction of the oil-cooled motor. Taking the second oil outlet channel d32 as a reference, the axis of the second oil outlet channel d32 is parallel to the axial direction of the oil-cooled motor, and the spraying direction of the cooling oil derived from the second oil outlet channel d32 can be limited, so that the direction of the cooling oil sprayed from the second oil outlet 31b is parallel to the axial direction of the oil-cooled motor.

[0080] In one embodiment, Figure 6b As shown, along the radial direction of the oil-cooled motor, the distance h12 between each first oil inlet 32a and the outer peripheral surface of the rotor 10 is greater than the distance h11 between each first oil outlet 31a and the outer peripheral surface of the rotor 10. When the rotor 10 rotates, the cooling oil is concentrated on the side of the first oil outlet channel d31 close to the outer peripheral surface of the rotor 10 due to the centripetal force, and the direction of the cooling oil flowing from the first oil inlet 32a to the first oil outlet 31a has a tendency to tilt outward along the radial direction of the oil-cooled motor. Taking the first oil outlet channel d31 as a reference, the axis of the first oil outlet channel d31 forms an angle with the axial direction of the oil-cooled motor, and the spraying direction of the cooling oil derived from the first oil outlet channel d31 can be limited, so that the direction of the cooling oil sprayed from the first oil outlet 31a tilts outward along the radial direction of the oil-cooled motor.

[0081] Similarly, the distance h22 between each second oil inlet 32b and the outer peripheral surface of the rotor 10 is greater than the distance h21 between each second oil outlet 31b and the outer peripheral surface of the rotor 10. When the rotor 10 rotates, the cooling oil is concentrated on the side of the second oil outlet channel d32 close to the outer peripheral surface of the rotor 10 due to the centripetal force, and the direction of the cooling oil flowing from the second oil inlet 32b to the second oil outlet 31b has a tendency to tilt outward along the radial direction of the oil-cooled motor. Taking the second oil outlet channel d32 as a reference, the axis of the second oil outlet channel d32 forms an angle with the axial direction of the oil-cooled motor, and the spraying direction of the cooling oil derived from the second oil outlet channel d32 can be limited, so that the direction of the cooling oil sprayed from the second oil outlet 31b is tilted outward along the radial direction of the oil-cooled motor.

[0082] In one embodiment, the cross-sectional shape of any part of the first oil outlet channel d31 perpendicular to the axial direction of the oil-cooled motor can be the same or different, and the cross-sectional shape of any part of the second oil outlet channel d32 perpendicular to the axial direction of the oil-cooled motor can be the same or different. The shape change of the first oil outlet channel d31 can affect the flow direction and flow rate of the cooling oil.

[0083] In one embodiment, the area of ​​each first oil outlet 31a is greater than the area of ​​each second oil outlet 31b, which is conducive to making the oil output of the first oil outlet 31a greater than the oil output of the second oil outlet 31b. Of course, the oil output of the first oil outlet 31a and the oil output of the second oil outlet 31b are also related to the amount of oil supplied to the first oil outlet 31a and the second oil outlet 31b by the rotor core 2.

[0084] In one embodiment, Figure 7 The schematic cross-sectional structure diagram of a rotor 10 is shown, and the oil cooling circuit of the rotor 10 also includes a plurality of radial flow channels d22 and a plurality of axial flow channels d21, and each radial flow channel d22 is used to connect the liquid inlet channel 11 and an axial flow channel d21. Along the axial direction of the oil-cooled motor, the distance s1 between each radial flow channel d22 and the first oil outlet 31a is greater than the distance s2 between each radial flow channel d22 and the second oil outlet 31b. The time for the cooling oil supplied to the rotor 10 by the radial flow channel d22 to flow to the first oil outlet 31a can be shorter than the time for the cooling oil to flow to the second oil outlet 31b, so that the oil output of the rotor 10 on the second oil outlet 31b side can be different from the oil output on the first oil outlet 31a side.

[0085] In one embodiment, please continue to refer to Figure 7As shown, with the structure of the rotor core 2 as a reference, the rotor core 2 includes a first core end face a1 and a second core end face a2, each axial flow channel d21 includes a first opening d211 and a second opening d212 opposite to each other along the axial direction of the oil-cooled motor, the first opening d211 of each axial flow channel d21 is distributed on the first core end face a1, and the second opening d212 of each axial flow channel d21 is distributed on the second core end face a2, and each first opening d211 is used to discharge cooling oil through a first oil outlet 31a. During the rotation of the rotor 10, the cooling oil in the rotor 10 is concentrated to one side of the outer peripheral surface of the rotor 10 under the action of centrifugal force.

[0086] In some embodiments, the distance h01 between the first opening d211 and the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor is greater than the distance h11 between the first oil outlet 31a and the outer peripheral surface of the rotor 10. It can be considered that there is a height difference between the first opening d211 of the axial flow channel d21 and the first oil outlet 31a along the radial direction of the oil-cooled motor, and when the cooling oil in the axial flow channel d21 is concentrated on the side of the axial flow channel d21 close to the outer peripheral surface of the rotor 10 due to the centrifugal force, the cooling oil can be smoothly transmitted to the first oil outlet 31a through the first opening d211 for spraying.

[0087] In some embodiments, the distance h02 between the second opening d212 and the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor is smaller than the distance h21 between the second oil outlet 31b and the outer peripheral surface of the rotor 10. It can be considered that there is a height difference between the second opening d212 of the axial flow channel d21 and the second oil outlet 31b along the radial direction of the oil-cooled motor. When the cooling oil in the axial flow channel d21 is concentrated on the side of the axial flow channel d21 close to the outer peripheral surface of the rotor 10 due to the centrifugal force, the cooling oil in the axial flow channel d21 needs to meet a certain liquid level height before it can flow to the second oil outlet 31b.

[0088] In one embodiment, Figure 7 In the rotor 10 shown, the first opening d211 of each axial flow channel d21 is connected to the first oil outlet 31a, and the first opening d212 of each axial flow channel d21 is connected to the second oil outlet 31b. Each axial flow channel d21 receives cooling oil delivered from the oil inlet channel 11 of the rotor shaft 1 through a radial flow channel d22, and the cooling oil in each axial flow channel d21 is sprayed out through the first oil outlet 31a and the second oil outlet 31b respectively.

[0089] In one embodiment, the axial flow channel d21 is used as a reference, the axis of the axial flow channel d21 is parallel to the axis of the rotor 10, and the distance between the axial flow channel d21 and the outer peripheral surface of the rotor 10 at any point along the axial direction of the oil-cooled motor is equal. Specifically, along the axial direction of the oil-cooled motor, one end of the axial flow channel d21 is connected to a first oil outlet 31a through a first oil outlet channel d31, and the other end of the axial flow channel d21 is connected to a second oil outlet 31b through a second oil outlet channel d32. The cooling oil in the axial flow channel d21 can flow to the first oil outlet 31a and the second oil outlet 31b along the axial direction of the oil-cooled motor and be sprayed out.

[0090] Please continue to refer to Figure 7 As shown, in one embodiment, the distance between the first oil inlet 32a and the outer circumference of the rotor 10 is smaller than the distance between the first opening d211 and the outer circumference of the rotor 10, and a step is formed between the axial flow channel d21 and the first oil outlet channel d31, which is close to the outer circumference of the rotor 10 along the radial direction of the oil-cooled motor. The cooling oil in the axial flow channel d21 flows to the end close to the first end plate 3a and can enter the first oil outlet channel d31 and be sprayed out through the first oil outlet 31a.

[0091] In one embodiment, the distance between the second oil inlet 32b and the outer peripheral surface of the rotor 10 is greater than the distance between the second opening d212 and the outer peripheral surface of the rotor 10, and a step is formed between the axial flow channel d21 and the second oil outlet channel d32, which is away from the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor. When the rotor 10 rotates at a high speed, the cooling oil in the axial flow channel d21 accumulates on the side of the axial flow channel d21 close to the outer peripheral surface under the action of centrifugal force. When the oil level of the cooling oil in the axial flow channel d21 reaches the position of the second opening d212 along the radial direction of the oil-cooled motor, the cooling oil can enter the second oil outlet channel d32 and spray through the second oil outlet 31b. In other words, when the oil level of the cooling oil in the axial flow channel d21 plus the distance between the axial flow channel d21 and the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor is greater than the distance between the second opening d212 and the outer peripheral surface of the rotor 10, the cooling oil can enter the second oil outlet channel d32 and spray through the second oil outlet 31b.

[0092] In one embodiment, the area of ​​each first oil outlet 31a is greater than or equal to the area of ​​each first opening d211, and the area of ​​each second oil outlet 31b is less than the area of ​​each second opening d212. The cooling oil in the axial flow channel d21 enters the first oil outlet channel d31 more easily and in greater quantity and is sprayed out through the first oil outlet hole 31a.

[0093] In one embodiment, based on the structure that the two ends of an axial flow channel d21 are respectively connected to a first oil outlet 31a and a second oil outlet 31b, the connection area between the axial flow channel d21 and the first oil outlet 31a is larger than the connection area between the axial flow channel d21 and the second oil outlet 31b. Specifically, the connection area between the axial flow channel d21 and the first oil outlet channel d31 is larger than the connection area between the axial flow channel d21 and the second oil outlet channel d32, and the cooling oil in the axial flow channel d21 enters the first oil outlet channel d31 more easily and in greater quantity and is ejected through the first oil outlet 31a.

[0094] In one embodiment, Figure 8 As shown, the rotor core 2 includes a plurality of rotor punchings 21, and the plurality of rotor punchings 21 are arranged adjacent to each other along the axial direction of the oil-cooled motor to form the rotor core 2. Each rotor punching 21 includes a plurality of cooling holes 211. When the plurality of rotor punchings 21 are arranged adjacent to each other along the circumferential direction of the oil-cooled motor, the plurality of cooling holes 211 of each rotor punching 21 can be respectively connected with the plurality of cooling holes 211 of the adjacent rotor punchings 21 to form the above-mentioned plurality of axial flow channels d21. Among them, the plurality of cooling holes 211 of a rotor punching 21 are respectively connected with the plurality of cooling holes 211 of the adjacent rotor punchings 21 in a one-to-one correspondence. Among them, one or more of the plurality of radial flow channels d22 in the oil cooling circuit of the rotor 10 are formed by a structure on a rotor punching 21, that is, one rotor punching 21 includes one or more of the above-mentioned plurality of radial flow channels d22. For the rotor punching 21, one end of each radial flow channel d22 is connected to a cooling hole 211, and the other end is connected to the central hole of the rotor punching 21, so as to receive the cooling oil transmitted by the rotor shaft 1 and deliver it to an axial flow channel d21.

[0095] In one embodiment, Fig. 9 The cross-sectional structure diagram of a rotor 10 is shown as an example, and each radial flow channel d31 is used to transport cooling oil to a second opening d212 and a second oil outlet 31b. The distance h02 between each second opening d212 and the outer peripheral surface of the rotor 10 is less than or equal to the distance h21 between each second oil outlet 31b and the outer peripheral surface of the rotor 10. Each radial flow channel d31 is used to divert the cooling oil in the oil inlet channel 11 of the rotor shaft 1 to an axial flow channel d21 and a second oil outlet 31b. At this time, the rotor 10 is equivalent to single-sided oil inlet.

[0096] In one embodiment, along the radial direction of the oil-cooled motor, the distance h3 between each radial flow channel d22 and the outer peripheral surface of the rotor 10 is smaller than the distance h02 between the second opening d212 and the outer peripheral surface of the rotor 10, and smaller than the distance h21 between the second oil outlet 31b and the outer peripheral surface of the rotor 10. There is a height difference between the radial flow channel d22 and the second opening d212 and the second oil outlet 31b along the radial direction of the oil-cooled motor. Under the centrifugal force of the rotation of the rotor 10, the radial flow channel d22 can have a certain reserve effect on the cooling oil.

[0097] In one embodiment, along the radial direction of the oil-cooled motor, the height difference between the radial flow channel d22 and the second opening d212 is smaller than the height difference between the radial flow channel d22 and the second oil outlet 31b, that is, the difference between h02 and h3 is smaller than the difference between h21 and h3. Under the centrifugal force of the rotation of the rotor 10, the cooling oil in the radial flow channel d can flow to the second opening d212 before the second oil outlet 31b.

[0098] In one embodiment, the radial flow channel d22 is a part of the structure of the second end plate 3b, and the radial flow channel d22 is connected to a second opening d212 of an axial flow channel d21 and a second oil outlet 31b along the axial direction of the oil-cooled motor. Fig.10a A structure of a second end plate 3b is shown. Fig.10b 3b is a schematic diagram of the cross-sectional structure of the second end plate 3b. Fig.10a and Fig.10b As shown, the second end plate 3b includes a plurality of radial grooves d33, a plurality of second oil outlet channels d32 and a plurality of second oil outlet ports 31b, each radial groove d33 is used as a radial flow channel d22, and each radial groove d33 is used to connect an axial flow channel d21 with a second oil outlet port 31b.

[0099] Specifically, the end surface of the second end plate 3b facing away from the rotor core 2 includes a plurality of second oil outlets 31b, and the plurality of second oil outlets 31b are arranged at intervals along the circumference of the oil-cooled motor. The end surface of the second end plate 3b facing the rotor core 2 includes the plurality of radial grooves d33, and the plurality of radial grooves d33 are arranged at intervals along the circumference of the oil-cooled motor. Each second oil outlet channel d31 connects a second oil outlet channel d32 with a radial groove d33. In the radial direction of the oil-cooled motor, one end of the radial groove d33 is connected to the second center hole k2 of the second end plate 3b. Among them, each radial groove d33 has the same shape, and the second oil outlet 31b is exemplified by a circular hole.

[0100] In one embodiment, along the radial direction of the oil-cooled motor, the distance between one end of the radial groove d33 close to the outer peripheral surface of the second end plate 3b and the second center hole k2 is greater than the distance between one end of the second oil outlet 31b close to the outer peripheral surface of the second end plate 3b and the second center hole k2. The radial groove d33 serves as a radial flow channel to supply oil to the axial flow channel d21. Along the circumference of the oil-cooled motor, the circumferential width of the radial groove d33 is greater than the circumferential width of the connected second oil outlet 31b and is less than or less than the circumferential width of the connected axial flow channel d21. The amount of cooling oil in the radial groove d33 can ensure the supply to the first oil outlet 31a and the second oil outlet 31b. For a group of connected second oil outlets 31b and radial grooves d33, along the axial direction of the oil-cooled motor, the orthographic projection of the radial groove d33 on any end surface of the second end plate 3b covers the orthographic projection of a corresponding second oil outlet 31b on the end surface, which is conducive to the cooling oil in the radial groove d33 meeting the oil injection cooling requirements.

[0101] Fig.11a For a Fig.10a , Fig.10bThe cross-sectional structure of the rotor 10 of the second end plate 3b is shown. The oil inlet channel 11 of the rotor shaft 1 specifically includes a plurality of axial channels d11 and a plurality of radial channels d12. Among them, the axial channel d11 penetrates the rotor shaft 1 along the axial direction of the oil-cooled motor, and each radial channel d12 connects the outer peripheral surface of the rotor shaft 1 with the axial channel d11 along the radial direction of the oil-cooled motor, and the plurality of radial channels d12 are arranged at intervals along the circumferential direction of the oil-cooled motor. The plurality of cooling holes 211 of the plurality of rotor punchings 21 of the rotor core 2 are respectively connected along the axial direction of the oil-cooled motor to form a plurality of axial flow channels d21, and each axial flow channel d21 penetrates the entire rotor core 2 along the axial direction of the oil-cooled motor, and the two end openings of each axial flow channel d21 are respectively located at the two core end faces of the rotor core 2. The first end plate 3a includes a plurality of first oil outlet passages d31 and a plurality of first oil outlets 31a. The end surface of the first end plate 3a facing away from the rotor core 2 includes the above-mentioned first oil outlets 31a. The plurality of first oil outlets 31a are arranged at intervals along the circumference of the oil-cooled motor. Each first oil outlet passage d31 connects a first oil outlet 31a with the end surface of the first end plate 3a facing the rotor core 2. The second end plate 3b includes a plurality of radial grooves d33, a plurality of second oil outlet passages d31 and a plurality of second oil outlets 31b. The end surface of the second end plate 3b facing away from the rotor core 2 includes the above-mentioned plurality of second oil outlets 31b. The plurality of second oil outlets 31b are arranged at intervals along the circumference of the oil-cooled motor. Each radial groove d33 is formed on the end surface of the second end plate 3b facing the rotor core 2. The plurality of radial grooves d33 are arranged at intervals along the circumference of the oil-cooled motor. Each second oil outlet channel d31 is connected to a second oil outlet port 31b and a radial groove d33 along the circumference of the oil-cooled motor, and each radial groove d33 is connected to a radial channel d12 of the rotor shaft 1 along the radial direction of the oil-cooled motor. Each radial groove d33 serves as a radial flow channel d22 of the oil cooling circuit of the rotor 10, which can receive the cooling oil delivered from the rotor shaft 1 and deliver it to an axial flow channel d21 and a second oil outlet channel d32. The distribution of multiple radial grooves d33 and multiple axial flow channels d21 can distribute the cooling oil delivered from the rotor shaft 1 more evenly along the circumference of the oil-cooled motor, prevent the cooling oil from being unevenly distributed in the circumference of the rotor 10 and causing hot spots, which is beneficial to improving the stability of the rotor 10 and optimizing the performance of the oil-cooled motor 100.

[0102] With reference to the structure of the entire rotor 10, each axial flow channel d21 is connected to the axial channel d11 through a radial groove d33 and a radial channel d12, thereby receiving the cooling oil delivered from the rotor shaft 1. Each radial groove d33 is connected to an axial flow channel d21 and a second oil outlet channel d32 along the axial direction of the oil-cooled motor, and the cooling oil can be delivered to a first oil outlet 31a and a second oil outlet 31b for spraying.

[0103] Fig.11b for Fig.11aThe partial structure of the middle rotor 10 specifically includes the second end plate 3b and the partial structure of the rotor core 2 and the rotor shaft 1. Fig.11b As shown, a radial groove d33 is connected to an axial flow channel d21 and a second oil outlet channel d32 along the axial direction of the oil-cooled motor, and the radial groove d33 is connected to a radial channel d12 along the radial direction of the oil-cooled motor. In the radial direction of the oil-cooled motor, the distance between the radial groove d33 and the outer peripheral surface of the rotor 10 is smaller than the distance between the axial flow channel d21 and the outer peripheral surface of the rotor 10, the distance between the second oil outlet channel d32 and the outer peripheral surface of the rotor 10, and the distance between the second oil outlet 31b and the outer peripheral surface of the rotor 10. Steps are formed between the radial groove d33 and the axial flow channel d21 and the second oil outlet channel d32, respectively, and both steps are close to one side of the outer peripheral surface of the rotor 10. When the cooling oil delivered by the rotor shaft 1 through the axial channel d11 and the radial channel d12 enters the radial groove d33, the cooling oil accumulates toward the outer peripheral surface of the rotor 10 under the action of the centripetal force. The end of the radial groove d33 close to the outer peripheral surface of the rotor 10 can play the role of storing cooling oil. The cooling oil delivered to the axial flow channel d21 and the second oil outlet channel d32 through the radial groove d33 has at least one difference in oil volume, flow rate, time, and angle. Combined with the different areas of the first oil outlet 31a and the second oil outlet 31b, the different spacing between the first oil outlet 31a and the outer peripheral surface of the rotor 10 and the different spacing between the second oil outlet 31b and the outer peripheral surface of the rotor 10, the cooling oil sprayed from the first oil outlet 31a and the second oil outlet 31b is finally different in quality, flow rate, time, and angle to meet the different oil cooling requirements of the windings at both ends of the stator 20.

[0104] In some embodiments, Fig.12 As shown, the second end plate 3b includes an annular groove d34. The annular groove d34 is used to surround and connect the above-mentioned multiple radial grooves d33. The annular groove d34 can receive the cooling oil delivered by the multiple radial grooves d33 and make the cooling oil flow along the circumference of the oil-cooled motor, further circumferentially homogenizing the cooling oil. Under the action of centripetal force, the cooling oil enters the annular groove d34 through the multiple radial grooves d33, and then the cooling oil is uniformly flowed along the circumference of the oil-cooled motor through the annular groove d34, and is respectively supplied to the multiple axial flow channels d21 and the multiple second oil outlets 31b along the axial direction of the oil-cooled motor. Fig.12 The second end plate 3b shown is applied to Fig.11a In the rotor shown, the annular groove d34 can make the cooling oil delivered by the multiple radial grooves d33 flow along the circumference of the oil-cooled motor to improve the uniformity of the circumferential distribution of the oil, so that the cooling oil entering the rotor core 2 is more evenly distributed along the circumference of the oil-cooled motor, and the cooling oil sprayed from both ends of the rotor 10 is also more evenly distributed in the circumferential direction of the oil-cooled motor.

[0105] In one embodiment, along the axial direction of the oil-cooled motor, the axial depth of the axial flow channel d34 is the same as the axial depth of the radial groove d33, which is beneficial to reducing the circulation resistance of the cooling oil.

[0106] In one embodiment, along the radial direction of the oil-cooled motor, the distance between the annular groove d34 and the outer peripheral surface of the rotor 10 is less than or equal to the distance between each second oil outlet 31b and the outer peripheral surface of the rotor 10, and less than the distance between the second opening d212 of the axial flow channel d21 and the outer peripheral surface of the rotor 10. The cooling oil enters the annular groove d34 under the action of centrifugal force. The annular groove d34 can provide a certain oil storage function, and then distributes the cooling oil to the axial flow channel d21 and the second oil outlet 31b.

[0107] In one embodiment, the annular groove d34 is connected to two or more radial grooves d33, but not to all radial grooves d33. When the cooling oil flows in the annular groove d34, the cooling oil can be evenly distributed in the circumferential direction, which can meet some special cooling requirements.

[0108] The present application also provides a rotor 10 having two or more layers of oil passages distributed radially, which can achieve a better oil cooling effect. Fig.13 The cross-sectional structure of a rotor 10 is shown. Fig.11a The difference of the rotor 10 shown is that the oil cooling circuit of the rotor 10 also includes a plurality of auxiliary flow channels d23, each auxiliary flow channel d23 includes an inlet d232 and an outlet d231, the inlets d232 of the plurality of auxiliary flow channels d23 are spaced apart along the circumference of the oil-cooled motor on the second core end face a2, the inlet d232 of each auxiliary flow channel d23 is spaced apart along the radial direction of the oil-cooled motor with the second opening d212 of an axial flow channel d21 and is used to connect with the same radial flow channel d22. The outlets of the plurality of auxiliary flow channels d23 are spaced apart along the circumference of the oil-cooled motor on the first core end face a1, the outlet of each auxiliary flow channel d23 is spaced apart along the radial direction of the oil-cooled motor with the first opening d211 of an axial flow channel and is used to connect with the same first oil outlet 31a. The cooling oil transmitted by a radial flow channel d22 can enter an axial flow channel d21 and an auxiliary flow channel d23 respectively, and the cooling oil in the axial flow channel d21 and the auxiliary flow channel d23 can flow into the same first oil outlet 31a at the same time. The axial flow channel d21 and the auxiliary flow channel d23 are similar to parallel oil circuits in the oil cooling circuit of the cooling oil, which can improve the oil cooling effect.

[0109] In one embodiment, between the auxiliary flow channel d23 and the axial flow channel d21 arranged at intervals along the radial direction of the oil-cooled motor, the distance between the auxiliary flow channel d23 and the axis of the rotor 10 is greater than the distance between the axial flow channel d21 and the axis of the rotor 10, thereby forming two layers of oil cooling channels arranged along the radial direction of the oil-cooled motor. When the auxiliary flow channel d23 is arranged between an axial flow channel d21 and the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor, the auxiliary flow channel d23 is closer to the magnetic steel 22 in the rotor 10, and the auxiliary flow channel d23 can better dissipate heat for the magnetic steel 22.

[0110] In one embodiment, the area of ​​the inlet d232 of each auxiliary flow channel d23 is smaller than the area of ​​the second opening d212 of each axial flow channel d21, the area of ​​the outlet d231 of each auxiliary flow channel d23 is smaller than the area of ​​the first opening d211 of each axial flow channel d21, and the cooling oil in the auxiliary flow channel d23 is used to assist oil cooling. When the auxiliary flow channel d23 is arranged between an axial flow channel d21 and the outer peripheral surface of the rotor 10 along the radial direction of the oil-cooled motor, the smaller size of the auxiliary oil channel d23 can ensure the strength of the rotor core 2.

[0111] In one embodiment, Fig.13 As shown, the distance between the outlet d231 of each auxiliary channel d23 and the axis of the rotor 10 is smaller than the sum of the distance between the first liquid outlet channel d31 connected to the auxiliary channel d23 and the axis of the rotor 10 and the radial length of the first liquid outlet channel d31, so that the auxiliary channel d23 can be connected through the first liquid outlet channel d31, and then connected with the first liquid outlet hole 31a.

[0112] In one embodiment, the outlet d231 of each auxiliary channel d23 can be connected to the first liquid outlet 31a through a channel on the first end plate 3a. Specifically, the first end plate 3a includes a channel that can connect the outlet d231 of the auxiliary channel d23 with the first liquid outlet 31a.

[0113] like Fig.14a The partial structure of the rotor core 2 of a rotor 10 provided in the embodiment of the present application shown in the figure specifically includes a rotor punching 21 and a plurality of magnetic steels 22 embedded in the rotor punching 21. Fig.14a As shown, the rotor punching 21 includes a plurality of cooling holes 211 and a plurality of mounting holes 212, each cooling hole 211 and each mounting hole 212 penetrates the rotor punching 21 along the axial direction of the oil-cooled motor. Along the circumference of the oil-cooled motor, the plurality of cooling holes 211 are arranged at intervals. Each mounting hole 212 is used to embed a magnetic steel 22.

[0114] In one embodiment, combining Fig.14aAs shown, the oval dotted circle contains a group of magnetic steel 22. Along the circumference of the oil-cooled motor, multiple groups of magnetic steel 22 are arranged at intervals, and one or more cooling holes 211 are arranged between any two adjacent groups of magnetic steel. When cooling oil flows through the cooling hole 211, the cooling oil exchanges heat with the rotor punching 21 through the cooling hole 211, thereby taking away the heat generated by the magnetic steel 22.

[0115] In one embodiment, along the radial direction of the oil-cooled motor, the distance between each cooling hole 211 and the first center hole k1 is smaller than the distance between each magnetic steel group and the first center hole k1, so as to ensure the strength of the rotor punching 21.

[0116] In one embodiment, combining Fig.14a As shown, each cooling hole 211 includes two circumferential inner walls that are opposite to each other along the radial direction of the oil-cooled motor. Among the two circumferential inner walls, the length of the circumferential side wall close to the outer peripheral surface of the rotor punching 21 along the circumference of the oil-cooled motor is less than the length of the axial side wall close to the first center hole k1. One end of the cooling hole 211 facing the outer peripheral surface of the rotor punching 21 can adapt to the shape of the area between two adjacent groups of magnetic steel, so as to achieve a good cooling effect while ensuring the strength of the rotor punching 21.

[0117] In one embodiment, combining Fig.14a As shown, each cooling hole 211 also includes two radial inner walls opposite to each other along the circumference of the oil-cooled motor, each radial inner wall is connected between the ends of the two axial inner walls, and the two circumferential inner walls and the two radial inner walls can enclose a cooling hole 211 with a trapezoidal cross-section. In order to improve the good flowability of the cooling oil, the connection between each group of circumferential inner walls and the radial inner walls is a smoothly transitioned arc surface. Among them, the radius of the arc surface can be set according to the shape of the rotor punching 21 and the size of the cooling hole 211. In some embodiments, the radius of the arc surface at the connection between the circumferential inner wall and the radial inner wall is about 1 mm.

[0118] like Fig.14b Another example of a rotor punching 21 and a plurality of magnetic steels 22 embedded in the rotor punching 21. The rotor punching 21 includes a plurality of cooling holes 211 and auxiliary cooling holes 213. The auxiliary cooling holes 213 penetrate the rotor punching 21 along the axial direction of the oil-cooled motor. The auxiliary cooling holes 213 are also used to circulate cooling oil. Exemplarily, an auxiliary cooling hole 213 is arranged between each cooling hole 211 and the outer peripheral surface of the rotor punching 21. The circumferential width of the auxiliary cooling hole 213 along the circumference of the oil-cooled motor is smaller than the circumferential width of the cooling hole 211, and is used to adapt to the space between two groups of magnetic steels 22 arranged along the axial direction. When multiple Fig.14b The rotor punchings 21 shown are stacked along the circumferential direction of the oil-cooled motor to form at least a portion of the rotor core 2. The multiple auxiliary cooling holes 213 of adjacent rotor punchings 21 can be connected in a one-to-one correspondence manner to form Fig.13At least a portion of the auxiliary flow channel d23.

[0119] The cross-sectional area of ​​the auxiliary cooling hole 213 is smaller than the cross-sectional area of ​​the cooling hole 211 , and the cooling oil in the auxiliary cooling hole 213 is mainly used for auxiliary oil cooling.

[0120] Combination Fig.14a and Fig.14b As shown, the mounting hole 212 included in the rotor punching 21 of the rotor 10 provided in the embodiment of the present application can be connected to the cooling hole 211, so that the cooling oil in the cooling hole 211 can enter the mounting hole 212 to directly oil-cool the magnetic steel 22 fixed in the mounting hole 212. Among them, the internal space of each mounting hole 212 is larger than the volume of the magnetic steel 22 accommodated in the mounting hole 212, so that the mounting hole 212 has a surplus space to accommodate the cooling oil after the magnetic steel 22 is embedded. Among them, the magnetic steel 22 can be fixed in the mounting hole 212 by gluing, interference fit, etc.

[0121] In summary, the oil-cooled motor 100 provided in the embodiment of the present application has an oil cooling circuit of the rotor 10 that can spray cooling oil in different states at both axial ends of the rotor 10, thereby spraying oil in different states at both ends of the stator winding 202 to meet the different heat dissipation requirements at both ends of the stator winding 202. Specifically, at least one parameter of the position, size, and shape of the oil outlets 31 on the two end plates 3 of the rotor 10 is different. Combined with the oil cooling circuit design inside the rotor 10, the oil outlet state at both ends of the rotor 10 can be adjusted as needed to meet the different oil cooling requirements at both ends of the stator winding 202. Of course, the structural changes in the different embodiments introduced in the above embodiments can be implemented independently or in combination, as long as the oil spraying state at both ends of the rotor 10 can meet the different heat dissipation requirements of the end windings on both sides of the stator winding 202.

[0122] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the 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 motor, characterized in that: The oil-cooled motor comprises a stator and a rotor, wherein the central hole of the stator is used to accommodate the rotor, and the rotor comprises a rotor shaft, a rotor core, a first end plate and a second end plate, and the rotor shaft passes through the first end plate, the rotor core and the second end plate in sequence along the axial direction of the oil-cooled motor, and the oil cooling circuit of the rotor comprises: An oil inlet channel, the oil inlet channel is distributed inside the rotor shaft, and the oil inlet channel is used to transport cooling oil to the inside of the rotor core; A plurality of oil outlets, the plurality of oil outlets are used to discharge cooling oil inside the rotor, the plurality of oil outlets comprising a plurality of first oil outlets and a plurality of second oil outlets; Among them, the multiple first oil outlets are distributed at intervals along the circumferential direction of the oil-cooled motor on the side of the first end plate away from the rotor core, and the multiple second oil outlets are distributed at intervals along the circumferential direction of the oil-cooled motor on the side of the second end plate away from the rotor core, and at least one of the areas of each first oil outlet and each second oil outlet or the distances between each first oil outlet and each second oil outlet and the inner circumferential surface of the stator along the radial direction of the oil-cooled motor are different.

2. The oil-cooled motor according to claim 1, characterized in that: Along the radial direction of the oil-cooled motor, a distance between each of the first oil outlets and the outer circumferential surface of the rotor is smaller than a distance between each of the second oil outlets and the outer circumferential surface of the rotor.

3. The oil-cooled motor according to claim 1 or 2, characterized in that: An area of ​​each of the first oil outlets is greater than an area of ​​each of the second oil outlets.

4. The oil-cooled motor according to any one of claims 1 to 3, characterized in that: The oil cooling circuit of the rotor further comprises a plurality of radial flow channels and a plurality of axial flow channels, each of the radial flow channels being used to connect the oil inlet channel and one of the axial flow channels, wherein: Along the axial direction of the oil-cooled motor, the distance between each of the radial flow channels and the first oil outlet is greater than the distance between each of the radial flow channels and the second oil outlet.

5. The oil-cooled motor according to claim 4, characterized in that: The rotor core comprises a first core end face and a second core end face opposite to each other in the axial direction of the oil-cooled motor, each of the axial flow channels comprises a first opening and a second opening opposite to each other in the axial direction of the oil-cooled motor, the first opening of each axial flow channel is distributed on the first core end face, and the second opening of each axial flow channel is distributed on the second core end face, wherein: Along the radial direction of the oil-cooled motor, each of the first openings is used to discharge cooling oil through a first oil outlet, and the distance between each of the first openings and the outer circumferential surface of the rotor is greater than the distance between each of the first oil outlets and the outer circumferential surface of the rotor.

6. The oil-cooled motor according to claim 5, characterized in that: Each of the radial flow channels is used to transport cooling oil to one of the second openings and one of the second oil outlets, wherein: Along the radial direction of the oil-cooled motor, the distance between each of the second openings and the outer circumferential surface of the rotor is less than or equal to the distance between each of the second oil outlets and the outer circumferential surface of the rotor.

7. The oil-cooled motor according to claim 6, characterized in that: The area of ​​each of the first oil outlets is greater than or equal to the area of ​​each of the first openings, and the area of ​​each of the second oil outlets is smaller than the area of ​​each of the second openings.

8. The oil-cooled motor according to claim 4, characterized in that: The rotor core further comprises a plurality of auxiliary flow channels, each of the auxiliary flow channels comprising an inlet and an outlet, wherein: The inlets of the plurality of auxiliary flow channels are spaced apart along the circumferential direction of the oil-cooled motor and distributed on the end surface of the second core. The inlet of each auxiliary flow channel and the second opening of one axial flow channel are spaced apart along the radial direction of the oil-cooled motor and are used to communicate with the same radial flow channel. The area of ​​the inlet of each auxiliary flow channel is smaller than the area of ​​the second opening of each axial flow channel. The outlets of the multiple auxiliary flow channels are distributed on the first core end surface along the circumferential direction of the oil-cooled motor, and the outlet of each auxiliary flow channel is arranged at intervals along the radial direction of the oil-cooled motor with the first opening of an axial flow channel and is used to connect to the same first oil outlet hole, and the area of ​​each outlet of the auxiliary flow channel is smaller than the area of ​​the first opening of each axial flow channel.

9. The oil-cooled motor according to any one of claims 4 to 8, characterized in that: The second end plate includes a plurality of radial grooves on one side facing the rotor core, each of the radial grooves is used as a radial flow channel, the plurality of radial grooves are arranged at intervals along the circumference of the oil-cooled motor, and each radial groove is used to connect one of the axial flow channels and one of the second oil outlets; Along the radial direction of the oil-cooled motor, the distance between each radial groove and the outer peripheral surface of the rotor is smaller than the distance between the second oil outlet and the outer peripheral surface of the rotor, and the distance between the axial flow channel and the outer peripheral surface of the rotor.

10. The oil-cooled motor according to claim 9, characterized in that: Along the circumference of the oil-cooled motor, the circumferential width of each radial groove is greater than the circumferential width of the second oil outlet connected thereto and smaller than the circumferential width of the second opening of the axial flow channel.

11. The oil-cooled motor according to claim 9 or 10, characterized in that: The second end plate further comprises an annular groove on a side facing the rotor core, wherein the annular groove is used to surround and connect the plurality of radial grooves, wherein: Along the radial direction of the oil-cooled motor, the distance between the annular groove and the outer circumferential surface of the rotor is less than or equal to the distance between each of the second oil outlets and the outer circumferential surface of the rotor, and less than the distance between the second opening of the axial flow channel and the outer circumferential surface of the rotor.

12. The oil-cooled motor according to any one of claims 1 to 11, characterized in that: The first end plate includes a plurality of first oil inlets on one side facing the rotor core, and the second end plate includes a plurality of second oil inlets on one side facing the rotor core, each of the first oil inlets is used to communicate with one of the first oil outlets, and each of the second oil inlets is used to communicate with one of the second oil outlets, wherein: An area of ​​each of the first oil inlets is greater than an area of ​​each of the second oil inlets.

13. The oil-cooled motor according to claim 12, characterized in that: Along the radial direction of the oil-cooled motor, the distance between each of the first oil inlet and the outer peripheral surface of the rotor is greater than or equal to the distance between each of the first oil outlet and the outer peripheral surface of the rotor, and the distance between each of the second oil inlet and the outer peripheral surface of the rotor is greater than or equal to the distance between each of the second oil outlet and the outer peripheral surface of the rotor.

14. A powertrain, characterized in that: The power assembly includes a reducer and the oil-cooled motor as claimed in claim 13, and the oil-cooled motor is drivingly connected to the reducer.

15. An electric vehicle, characterized in that: The vehicle comprises wheels and the powertrain according to claim 14, wherein the powertrain is used to drive the wheels.

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