Oil cooling motor, electric driving system and electric vehicle

Abstract

The utility model provides an oil cooling motor, an electric driving system and an electric automobile, the oil cooling motor comprises a stator iron core, two ends of the stator iron core are provided with an A-end stator winding and a B-end stator winding, and an iron core oil channel is arranged in the stator iron core; the A-end oil ring is connected between the stator iron core and the inner wall of the motor shell in an abutting mode, an A-end oil cavity is formed among the A-end oil ring, the motor shell and the stator iron core, and the A-end stator winding is located in the A-end oil cavity; the B-end oil ring is connected between the stator iron core and the inner wall of the motor shell in an abutting mode, a B-end oil cavity is formed between the motor shell and the stator iron core through the B-end oil ring, and the B-end stator winding is located in the B-end oil cavity; wherein the A-end oil cavity is communicated with the B-end oil cavity through the iron core oil duct, one of the A-end oil cavity and the B-end oil cavity is communicated with the oil inlet, and the other one of the A-end oil cavity and the B-end oil cavity is communicated with the oil outlet. According to the oil cooling motor, the electric driving system and the electric automobile provided by the utility model, the cooling efficiency of the stator winding can be improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy, and in particular to an oil-cooled motor, an electric drive system and an electric vehicle. Background Art

[0002] The oil spray ring, also known as the oil ring or oil distribution ring, is a part used to form the stator cooling oil circuit on the oil-cooled motor and spray cool the stator winding end of the motor. The oil spray ring consists of the oil ring body, two sealing rings and the oil spray holes on the oil ring body.

[0003] The oil sprayed from the oil spray hole cannot adhere to the surface of the stator winding for a long time, and will drip from the stator winding into the motor cavity due to gravity, resulting in low cooling efficiency of the stator winding. Therefore, there is room for improvement. Utility Model Content

[0004] The utility model aims to provide an oil-cooled motor, an electric drive system and an electric vehicle to improve the cooling efficiency of the stator winding.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model provides an oil-cooled motor, comprising a motor housing and a rotor and a stator installed therein, wherein the stator comprises:

[0007] The stator core has an A-end stator winding and a B-end stator winding at both ends, and an iron core oil channel is arranged inside the stator core;

[0008] An A-end oil ring is abutted between the stator core and the inner wall of the motor housing, an A-end oil cavity is formed between the A-end oil ring, the motor housing and the stator core, and the A-end stator winding is located in the A-end oil cavity; and

[0009] The B-end oil ring is in contact with the inner wall of the stator core and the motor housing, and a B-end oil cavity is formed between the B-end oil ring, the motor housing and the stator core, and the B-end stator winding is located in the B-end oil cavity;

[0010] The A-end oil chamber is connected to the B-end oil chamber through the core oil passage, one of the A-end oil chamber and the B-end oil chamber is connected to the oil inlet, and the other is connected to the oil outlet.

[0011] In one embodiment of the utility model, the A-end oil ring comprises:

[0012] An A-end oil ring body, one end of which abuts against the stator core; and

[0013] The annular protrusion is connected to the other end of the A-end oil ring body, and the annular protrusion abuts against the inner wall of the motor housing.

[0014] In an embodiment of the present invention, an A-end seal is provided between the contact surface between the annular protrusion and the motor housing.

[0015] In an embodiment of the utility model, the A-end oil ring further includes an annular abutment portion, which is formed on the periphery of the annular protrusion and abuts against the inner wall of the motor housing.

[0016] In one embodiment of the utility model, the B-end oil ring includes:

[0017] A B-end oil ring body, one end of which abuts against the stator core, and the other end of which abuts against the inner wall of the motor housing; and

[0018] The B-end sealing member is located between the abutting portion of the motor housing and the B-end oil ring body.

[0019] In one embodiment of the utility model, the B-end oil ring body comprises:

[0020] An inner oil ring, one end of which is in contact with the stator core;

[0021] a connecting piece connected to the other end of the inner oil ring; and

[0022] An outer oil ring has one end connected to the connecting piece and the other end abutting against the inner wall of the motor housing, wherein the inner oil ring is located on the inner side of the outer oil ring.

[0023] In an embodiment of the present invention, the B-end oil ring is connected to the motor housing in an abutting manner or in a detachable manner.

[0024] In an embodiment of the present invention, the A-end oil ring and the B-end oil ring are stainless steel sheet metal parts, and in the vertical direction, the cross-section of the A-end oil ring and the B-end oil ring is in a Z shape.

[0025] The utility model also provides an electric drive system, comprising the oil-cooled motor.

[0026] The utility model also provides an electric vehicle, comprising the electric drive system.

[0027] As described above, the utility model provides an oil-cooled motor, an electric drive system and an electric vehicle, which can effectively improve the cooling efficiency by directly immersing the stator winding in flowing cooling oil, thereby improving the performance of the motor to a certain extent.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a partial cross-sectional schematic diagram of an oil-cooled motor in one embodiment;

[0031] Figure 2 is a schematic diagram of the A-end oil ring in one embodiment;

[0032] Figure 3 It is a cross-sectional schematic diagram of one side of the oil ring at the A end of an oil-cooled motor in one embodiment;

[0033] Figure 4 Another cross-sectional schematic diagram of one side of the oil ring at the A end of the oil-cooled motor in one embodiment;

[0034] Figure 5 It is another cross-sectional schematic diagram of one side of the oil ring at the A end of the oil-cooled motor in one embodiment;

[0035] Figure 6 is another partial cross-sectional schematic diagram of an oil-cooled motor in one embodiment;

[0036] Figure 7 is a schematic diagram of the B-end oil ring in one embodiment;

[0037] Figure 8 FIG. 4 is a schematic cross-sectional view of another part of an oil-cooled motor in an embodiment.

[0038] In the figure: 10, motor housing; 11, B end cover;

[0039] 20. Stator core; 21. Stator winding at end A; 22. Stator winding at end B;

[0040] 30. A-end oil ring; 31. A-end oil ring body; 32. A-end seal; 33. Oil return groove; 34. Annular protrusion; 35. Annular abutment;

[0041] 40. B-end oil ring; 41. B-end oil ring body; 411. Inner oil ring; 412. Connector; 413. Outer oil ring; 42. B-end seal; 43. Oil outlet; 44. Three-phase outlet; 45. Lug; 46. Washer; 47. Reinforcement rib; 48. Bolt;

[0042] 50. Oil chamber at end A;

[0043] 60, oil chamber at end B;

[0044] 70. Iron core oil channel. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] The utility model discloses an electric vehicle, which may include a power battery system, a control system, a vehicle body, an electric drive system and the like.

[0047] Among them, the power battery system is usually composed of multiple battery cells, which may include a temperature management system, a battery management system (BMS), a charging system, etc. to ensure the safety and efficiency of the battery.

[0048] The control system includes the central control unit of the electric vehicle and various auxiliary control systems, which work together to ensure the performance, safety and comfort of the vehicle.

[0049] The vehicle body may include the frame, suspension system, braking system, tires, etc.

[0050] The electric drive system may include an inverter, a reducer, a motor controller, an oil-cooled motor, etc.

[0051] Specifically, the inverter can convert the direct current output by the battery into the alternating current required to drive the motor.

[0052] The reducer can reduce the high-speed rotational force output by the oil-cooled motor to the lower speed required by the wheels, while increasing the torque to meet the needs of vehicle driving.

[0053] The motor controller may be responsible for regulating the power output of the oil-cooled motor to ensure efficient and performance vehicle operation.

[0054] The oil-cooled motor can convert the electrical energy of the battery unit into mechanical energy to drive the vehicle. The oil-cooled motor may include a motor housing 10, a rotor, a bearing, a stator, and the like.

[0055] In one embodiment, the motor housing 10 is the outer shell of the oil-cooled motor. The motor housing 10 is made of metal material, which is used to protect the internal components from the external environment, and also plays a role in supporting and fixing the entire oil-cooled motor structure.

[0056] The rotor is located in the motor housing 10 and can rotate around a central axis. The rotor can interact with the magnetic field of the stator to generate torque and rotational motion. The rotor can be an iron core with a winding.

[0057] Bearings can be installed at both ends of the motor's shaft to support the shaft, reduce friction during rotation, and maintain a precise gap between the rotor and stator.

[0058] See also Figure 1 In one embodiment, the stator is located in the motor housing 10. The stator may include a stator core 20, an A-end oil ring 30, a B-end oil ring 40, and the like.

[0059] Specifically, the stator core 20 is composed of a plurality of silicon steel sheets stacked together. The silicon steel sheets are insulated to reduce energy loss caused by eddy currents. The stator core 20 can provide a magnetic circuit path for conducting the magnetic field generated by the current flowing through the stator winding. When the motor is working, the magnetic field interacts with the magnetic field on the rotor to generate torque and drive the rotor to rotate.

[0060] See also Figure 1 In one embodiment, the two ends of the stator core 20 may be formed with an A-end stator winding 21 and a B-end stator winding 22. The A-end stator winding 21 and the B-end stator winding 22 may generate a magnetic field through current. The magnetic field generated by the stator winding interacts with the magnetic field on the rotor, thereby generating torque and rotational motion, so that the rotor can drive the load to work.

[0061] Furthermore, after the current passes through the stator winding, a certain amount of heat will be generated, causing the temperature of the stator winding 21 at the A end and the stator winding 22 at the B end to rise. Therefore, the stator winding 21 at the A end and the stator winding 22 at the B end need to be cooled.

[0062] See also Figure 1 and Figure 2 In one embodiment, the A-end oil ring 30 can be installed on one side of the A-end stator winding 21. One end of the A-end oil ring 30 can abut against the inner wall of the motor housing 10, and the other end can abut against one end of the stator core 20. At this time, the outer side of the A-end oil ring 30, the inside of the motor housing 10, and the outer periphery of one end of the stator core 20 can form a cavity, namely, the A-end oil cavity 50. The A-end stator winding 21 can be located in the A-end oil cavity 50. The cooling oil in the A-end oil cavity 50 can cool the A-end stator winding 21.

[0063] See also Figure 2 In one embodiment, the material of the A-end oil ring 30 may be plastic. The A-end oil ring 30 may be an integrally formed structure. The A-end oil ring 30 may include an A-end oil ring body 31 , an A-end seal 32 , and an oil return groove 33 .

[0064] See also Figure 2 and Figure 3 , the entire A-end oil ring body 31 may be in a shape similar to a circular ring. In the vertical direction, the cross-section of the A-end oil ring body 31 may be in a shape similar to a trapezoid, and the hypotenuse of the trapezoid is located inside the A-end oil ring body 31. In the direction toward the stator core 20, the thickness of one end of the A-end oil ring body 31 is less than the thickness of the other end, thereby avoiding interference between the A-end oil ring body 31 and the rotor.

[0065] Among them, in the direction toward the stator core 20, on the abutting portion of the A-end oil ring body 31 and the stator core 20, one end of the A-end oil ring body 31 will partially protrude from the stator core 20. At least one oil return groove 33 may be formed on the inner wall of the A-end oil ring body 31. The oil return groove 33 can serve to return the cooling oil in the air gap between the stator core 20 and the rotor to the oil pan, ensuring the effective recovery and circulation of the cooling oil. Among them, the air gap refers to the non-contact space between the stator core 20 and the rotor, which will be filled with cooling oil. The cooling oil can not only play a lubricating role and reduce the friction between the stator and the rotor, but also transfer heat.

[0066] In the direction away from the stator core 20, on the abutting portion between the A-end oil ring body 31 and the motor housing 10, an annular protrusion 34 may be formed on the other end of the A-end oil ring body 31. The annular protrusion 34 may abut against the inner wall of the motor housing 10. The annular protrusion 34 may protrude from the outer surface of the A-end oil ring body 31.

[0067] See also Figure 3 On the contact surface between the annular protrusion 34 and the motor housing 10, an annular sealing groove may be formed on the annular protrusion 34, and an annular sealing groove may also be correspondingly formed on the inner wall of the motor housing 10, and the positions of the two annular sealing grooves may correspond to each other. The A-end seal 32 may be installed on the annular sealing groove between the annular protrusion 34 and the motor housing 10. The A-end seal 32 may be a rubber sealing ring. When the A-end oil ring 30 is abutted against the inner wall of the motor housing 10 through the stator core 20, the A-end oil ring 30 is in an interference compression state. At this time, the axial interference compression amount can be reduced by the rubber sealing ring. That is, the A-end seal 32 can play a role of sealing and buffering.

[0068] See also Figure 4 In one embodiment, on the contact surface between the annular protrusion 34 and the motor housing 10, the A-end seal 32 may not be installed between the annular protrusion 34 and the motor housing 10. The A-end oil ring 30 and the inner wall of the motor housing 10 may be directly abutted by interference fit. At this time, the annular protrusion 34 may be formed with an annular sealing groove or may not be formed with an annular sealing groove.

[0069] See also Figure 5 In one embodiment, in the direction away from the stator core 20, on the abutment portion of the A-end oil ring body 31 and the motor housing 10, an annular abutment portion 35 may be formed on the periphery of the annular protrusion 34. The annular abutment portion 35 may abut against the inner wall of the motor housing 10. By providing the annular abutment portion 35 on the periphery of the annular protrusion 34, the contact area between the A-end oil ring 30 and the motor housing 10 can be increased, thereby improving the sealing effect. At the same time, the structural stability of the A-end oil ring 30 can also be improved to prevent cracks from occurring during the abutment process. At this time, in the vertical direction, the shape of the cross section of the A-end oil ring 30 can be approximately L-shaped.

[0070] In one embodiment, the annular protrusion 34 and the annular abutment portion 35 can be processed by integral molding. Alternatively, the annular protrusion 34 and the annular abutment portion 35 can also be connected by welding, splicing, bolting, etc.

[0071] In one embodiment, an annular sealing groove may be formed on the annular abutment portion 35, and an annular sealing groove may be correspondingly formed on the inner wall of the motor housing 10, and the positions of the two annular sealing grooves may correspond to each other. The A-end seal 32 may be installed on the annular sealing groove of the annular abutment portion 35 and the motor housing 10.

[0072] In one embodiment, on the contact surface between the annular abutment portion 35 and the motor housing 10, the A-end seal 32 may not be installed between the annular abutment portion 35 and the motor housing 10. The A-end oil ring 30 may directly abut against the inner wall of the motor housing 10 by a bonding method. At this time, an annular sealing groove may be formed on the annular abutment portion 35, or an annular sealing groove may not be formed.

[0073] See also Figure 6 In one embodiment, the A-end oil ring 30 may also be a stainless steel sheet metal. Since the strength of stainless steel sheet metal is higher than that of plastic, the A-end oil ring 30 may be directly installed between the motor housing 10 and the stator core 20 by interference fit. At this time, the A-end oil ring 30 may be composed of two circular rings with different inner diameters, and in the vertical direction, the cross-section of the A-end oil ring 30 may be approximately Z-shaped.

[0074] See also Figure 1 and Figure 7In one embodiment, the B-end oil ring 40 can be installed on one side of the B-end stator winding 22. One end of the B-end oil ring 40 can abut against one end of the stator core 20, and the other end can abut against the inner wall of the motor housing 10. At this time, one side of the B-end oil ring 40, the inside of the motor housing 10, and the periphery of one end of the stator core 20 can form a cavity, namely, the B-end oil cavity 60. The B-end stator winding 22 can be located in the B-end oil cavity 60. The cooling oil in the B-end oil cavity 60 can cool the B-end stator winding 22.

[0075] See also Figure 7 In one embodiment, the material of the B-end oil ring 40 may be plastic. The B-end oil ring 40 may be an integrally formed structure. The B-end oil ring 40 may include a B-end oil ring body 41 and a B-end seal 42 .

[0076] See also Figure 1 and Figure 7 In one embodiment, the B-end oil ring body 41 may include an inner oil ring 411, a connector 412, and an outer oil ring 413. One end of the inner oil ring 411 may be connected to one end of the outer oil ring 413 through the connector 412. The inner diameter of the inner oil ring 411 is smaller than the inner diameter of the outer oil ring 413, the width of the inner oil ring 411 is larger than the width of the outer oil ring 413, and the inner oil ring 411 is located on the inner side of the outer oil ring 413. The inner diameter of the A-end oil ring body 31 is also smaller than the inner diameter of the outer oil ring 413. The inner oil ring 411 may be in a circular ring shape. The connector 412 may be in a disc shape. The outer oil ring 413 may be in a circular ring shape.

[0077] Specifically, in the direction toward the stator core 20, the inner oil ring 411 can abut against the stator core 20. At the abutting portion, one end of the inner oil ring 411 partially protrudes from the stator core 20. In this way, when the B-end oil ring 40 is installed inside the motor housing 10, the inner oil ring 411 can be in an interference-tightened state.

[0078] See also Figure 1 and Figure 7 In one embodiment, in the direction toward the stator core 20, the outer oil ring 413 can abut against the inner wall of the motor housing 10. On the contact surface between the outer oil ring 413 and the motor housing 10, an annular sealing groove can be formed on the outer oil ring 413, and an annular sealing groove can be formed correspondingly on the inner wall of the motor housing 10, and the positions of the two annular sealing grooves can correspond to each other. The B-end seal 42 can be installed between the two annular sealing grooves. The B-end seal 42 can be a rubber sealing ring. When the B-end oil ring is abutted against the motor housing 10, the B-end oil ring 40 is in an interference compression state, and the axial interference compression can be reduced by the rubber sealing ring. That is, the B-end seal 42 can play a role of sealing and buffering.

[0079] See also Figure 1 and Figure 7 In one embodiment, the B-end seal 42 may not be installed on the contact surface between the outer oil ring 413 and the motor housing 10. The B-end oil ring 40 and the inner wall of the motor housing 10 may be directly abutted by interference fit. At this time, the outer oil ring 413 may be formed with an annular sealing groove or may not be formed with an annular sealing groove.

[0080] See also Figure 7 In one embodiment, in order to improve the overall strength of the B-end oil ring 40 , a plurality of reinforcing ribs 47 may be provided at intervals on the inner surface of the outer oil ring 413 in a direction toward the inner oil ring 411 .

[0081] See also Figure 7 In one embodiment, an oil outlet 43 and a three-phase outlet 44 may be provided on the connector 412. The cooling oil in the A-end oil chamber 50 and the B-end oil chamber 60 may be discharged through the oil outlet 43. The three-phase outlet 44 may be an interface for connecting the motor with a power supply or a control system for transmitting electric energy. The three-phase outlet 44 may correspond to different windings of the motor. Of course, in other embodiments, the oil outlet 43 and the three-phase outlet 44 may also be provided on the motor housing 10.

[0082] See also Figure 7 In one embodiment, the B-end oil ring 40 can be connected to the motor housing 10 in a detachable manner. For example, the B-end oil ring 40 and the motor housing 10 can be connected by bolting. Specifically, a plurality of lugs 45 can be provided at intervals on the connecting member 412. Each lug 45 can be provided with a washer 46, which can then be matched with the motor housing 10 through a bolt 48 to fix the B-end oil ring 40 to the motor housing 10.

[0083] See also Figure 8 In one embodiment, the B-end oil ring 40 may also be abutted against the motor housing 10 by interference fit. For example, the outer oil ring 413 may be abutted against the motor housing 10 through the B-end cover 11. At this time, a rubber gasket may be installed on the contact portion between the B-end cover 11 and the outer oil ring 413, and the axial interference compression amount may be reduced by the rubber gasket to prevent cracks from occurring during the abutment process.

[0084] See also Figure 6 In one embodiment, the B-end oil ring 40 may also be a stainless steel sheet metal. Since the strength of stainless steel sheet metal is higher than that of plastic, the B-end oil ring 40 may be directly installed between the motor housing 10 and the stator core 20 by interference fit. At this time, the B-end oil ring 40 may be composed of two circular rings with different inner diameters, and in the vertical direction, the cross-section of the B-end oil ring 40 may be approximately Z-shaped.

[0085] See also Figure 1 In one embodiment, at least one core oil passage 70 may be provided in the stator core 20. The core oil passage 70 may be connected to the A-end oil chamber 50 and the B-end oil chamber 60. At this time, the cooling oil in the A-end oil chamber 50 may flow into the B-end oil chamber 60 through the core oil passage 70. Alternatively, the cooling oil in the B-end oil chamber 60 may flow into the A-end oil chamber 50 through the core oil passage 70.

[0086] Furthermore, in order to cool the A-end stator winding 21 in the A-end oil chamber 50 and the B-end stator winding 22 in the B-end oil chamber 60, an oil inlet can be provided on the motor housing 10 on one side of the A-end oil chamber 50, and an oil outlet can be provided on the motor housing 10 on one side of the B-end oil ring 40 or the B-end oil chamber 60. The cooling oil can enter the A-end oil chamber 50 through the oil inlet, and enter the B-end oil chamber 60 through the core oil passage 70, and finally be discharged from the oil outlet under the action of the oil pump. At this time, the A-end stator winding 21 and the B-end stator winding 22 can be cooled by the circulation of the cooling oil, and the cooling efficiency is relatively high.

[0087] Furthermore, the oil inlet may also be provided on the B-end oil ring 40 or on the motor housing 10 on one side of the B-end oil chamber 60, and the oil outlet may also be provided on the motor housing 10 on one side of the A-end oil chamber 50. The cooling oil may enter the B-end oil chamber 60 through the oil inlet, and enter the A-end oil chamber 50 through the core oil passage 70, and finally be discharged from the oil outlet under the action of the oil pump.

[0088] See also Figure 1 During the assembly of the motor, the stator core 20 can be first installed in the motor housing 10, and the axial direction of the stator core 20 can be positioned by the stopper. After that, the A-end oil ring 30 can be installed on one side of the A-end stator winding 21. The A-end oil ring 30 can abut between the inner wall of the motor housing 10 and the stator core 20 to form an A-end oil chamber 50. Finally, the B-end oil ring 40 can be installed on one side of the B-end stator winding 22 by bolts or the B-end cover body 11 to form a B-end oil chamber 60.

[0089] It can be seen that in the above scheme, directly immersing the stator winding in the flowing cooling oil can effectively improve the cooling efficiency, and thus improve the performance of the motor to a certain extent.

[0090] The embodiments of the utility model disclosed above are only used to help illustrate the utility model. The embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An oil-cooled motor, characterized in that: It includes a motor housing and a rotor and a stator installed therein, wherein the stator includes: The stator core has an A-end stator winding and a B-end stator winding at both ends, and an iron core oil channel is arranged inside the stator core; An A-end oil ring is abutted between the stator core and the inner wall of the motor housing, an A-end oil cavity is formed between the A-end oil ring, the motor housing and the stator core, and the A-end stator winding is located in the A-end oil cavity; and The B-end oil ring is in contact with the inner wall of the stator core and the motor housing, and a B-end oil cavity is formed between the B-end oil ring, the motor housing and the stator core, and the B-end stator winding is located in the B-end oil cavity; The oil chamber at the A end is connected to the oil chamber at the B end through an iron core oil passage, one of the oil chamber at the A end and the oil chamber at the B end is connected to the oil inlet, and the other is connected to the oil outlet.

2. The oil-cooled motor according to claim 1, characterized in that: The A-end oil ring comprises: An A-end oil ring body, one end of which abuts against the stator core; and The annular protrusion is connected to the other end of the A-end oil ring body, and the annular protrusion abuts against the inner wall of the motor housing.

3. The oil-cooled motor according to claim 2, characterized in that: An A-end seal is provided between the contact surface between the annular protrusion and the motor housing.

4. The oil-cooled motor according to claim 2, characterized in that: The A-end oil ring further includes an annular abutment portion, which is formed on the periphery of the annular protrusion and abuts against the inner wall of the motor housing.

5. The oil-cooled motor according to claim 1, characterized in that: The B-end oil ring comprises: A B-end oil ring body, one end of which abuts against the stator core, and the other end of which abuts against the inner wall of the motor housing; and The B-end sealing member is located between the abutting portion of the motor housing and the B-end oil ring body.

6. The oil-cooled motor according to claim 5, characterized in that: The B-end oil ring body comprises: An inner oil ring, one end of which is in contact with the stator core; a connecting piece connected to the other end of the inner oil ring; and An outer oil ring has one end connected to the connecting piece and the other end abutting against the inner wall of the motor housing, wherein the inner oil ring is located on the inner side of the outer oil ring.

7. The oil-cooled motor according to claim 1, characterized in that: The B-end oil ring is connected to the motor housing in an abutting manner or in a detachable manner.

8. The oil-cooled motor according to claim 1, characterized in that: The A-end oil ring and the B-end oil ring are stainless steel sheet metal parts, and in the vertical direction, the cross-section of the A-end oil ring and the B-end oil ring is in a Z shape.

9. An electric drive system, characterized in that: It comprises the oil-cooled motor as claimed in any one of claims 1 to 8.

10. An electric vehicle, characterized in that: Comprising the electric drive system as claimed in claim 9.

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