Motor cooling system and vehicle

Abstract

The present invention provides a motor cooling system and a vehicle, belonging to the technical field of motors, and comprising a casing, a rotor assembly, a stator assembly, and a first oil cooling structure, a second oil cooling structure, a third oil cooling structure, and a fourth oil cooling structure respectively arranged in the casing. The rotor assembly is rotatably arranged in the casing; the stator assembly is sleeved on the outer periphery of the rotor assembly; the first oil cooling structure is located at the periphery of the first end of the rotor assembly, the second oil cooling structure is located at the periphery of the first end of the stator assembly, the third oil cooling structure is located at the periphery of the second end of the rotor assembly, and the fourth oil cooling structure is located at the periphery of the second end of the stator assembly. In the motor cooling system provided by the present invention, whether the vehicle is in the process of driving or in the process of parking and boosting charging, the first oil cooling structure and the third oil cooling structure can spray oil to cool the rotor assembly to avoid overheating and failure of the rotor assembly; the second oil cooling structure and the fourth oil cooling structure can spray oil to cool the stator assembly to improve the cooling effect of the stator assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and more specifically, relates to a motor cooling system and a vehicle. Background Art

[0002] Boost charging technology can increase the low voltage of the power grid (such as 220V / 380V) to a higher voltage (such as 400V or 800V) to meet the high voltage requirements of electric vehicle batteries. As one of the core components for implementing boost charging technology, the structure and heat dissipation of the motor need to be adjusted accordingly.

[0003] During the parking boost charging process, the boost charging current generates resistance loss through the motor windings, which can cause the stator and rotor inside the motor to overheat. If this heat cannot be dissipated effectively and in a timely manner, the motor temperature will be too high, thereby affecting the performance of the motor and may even damage the motor.

[0004] Under the existing boost charging technology, the cooling methods of the motor are mainly divided into water cooling and oil cooling. However, whether it is water cooling or oil cooling, the rotor assembly cannot be cooled during the boost charging process when the vehicle is parked, resulting in rotor overheating and failure, and the cooling effect of the stator assembly is not ideal. Summary of the invention

[0005] The object of the present invention is to provide a motor cooling system and a vehicle, aiming to solve the technical problems in the prior art that the rotor assembly cannot be cooled and the stator assembly cooling effect is not ideal during the vehicle parking boost charging process.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: providing a motor cooling system, comprising a housing, a rotor assembly and a stator assembly; the rotor assembly is rotatably arranged in the housing; the stator assembly is located in the housing and sleeved on the outer periphery of the rotor assembly; it is defined that the rotor assembly and the stator assembly both have a first end and a second end axially opposite to each other; the motor cooling system further comprises a first oil cooling structure, a second oil cooling structure, a third oil cooling structure and a fourth oil cooling structure respectively arranged in the housing;

[0007] Among them, the first oil cooling structure is located at the periphery of the first end of the rotor assembly, the second oil cooling structure is located at the periphery of the first end of the stator assembly, the third oil cooling structure is located at the periphery of the second end of the rotor assembly, and the fourth oil cooling structure is located at the periphery of the second end of the stator assembly.

[0008] The beneficial effects of the motor cooling system provided by the present invention are as follows: compared with the prior art, in the motor cooling system of the present invention, the first oil cooling structure is arranged on the periphery of the first end of the rotor assembly, and the third oil cooling structure is arranged on the periphery of the second end of the rotor assembly. Whether the vehicle is in the process of driving or in the process of parking boost charging, the first oil cooling structure and the third oil cooling structure can spray oil to cool the rotor assembly to reduce the temperature of the rotor assembly and avoid overheating and failure of the rotor assembly; the second oil cooling structure is arranged on the periphery of the first end of the stator assembly, and the fourth oil cooling structure is arranged on the periphery of the second end of the stator assembly. Whether the vehicle is in the process of driving or in the process of parking boost charging, the second oil cooling structure and the fourth oil cooling structure can spray oil to cool the stator assembly to improve the cooling effect of the stator assembly.

[0009] In a possible implementation, the housing includes a shell and an end cover, the end cover is connected to the shell; the shell is provided with a first oil inlet branch and a second oil inlet branch, the inlet end of the first oil inlet branch and the inlet end of the second oil inlet branch are both connected to the electronic pump; the end cover is provided with an oil main passage;

[0010] The first oil inlet branch is in communication with the oil main passage, and the oil main passage is in communication with the first oil cooling structure and the second oil cooling structure respectively;

[0011] The second oil inlet branch is communicated with the third oil cooling structure and the fourth oil cooling structure respectively.

[0012] By arranging the first oil inlet branch and the second oil inlet branch on the shell, and arranging the main oil passage on the end cover, the shell and the end cover are connected with the above-mentioned four oil cooling structures respectively by utilizing their own structures, without the need for external pipelines, thereby simplifying the structure of the motor oil cooling system and optimizing the circulation path of the cooling oil.

[0013] In some embodiments, the first oil cooling structure includes:

[0014] A first annular tube is located at the axial periphery of the first end of the rotor assembly and is coaxially arranged with the rotor assembly; a plurality of first oil injection holes are arranged on the first annular tube, and each of the first oil injection holes faces the first end of the rotor assembly;

[0015] a first oil inlet pipe, whose oil inlet end is connected to the oil outlet end of the oil main passage, and whose oil outlet end is connected to the oil inlet end of the first annular pipe; and

[0016] The first mounting bracket is arranged on the first ring tube and fixed on the end cover.

[0017] The main body of the first cooling structure is an annular tubular structure, which can fully utilize the inner cavity space of the end cover and ensure uniform cooling and heat dissipation of the first end of the rotor assembly.

[0018] In some embodiments, the main oil passage includes an axial oil passage main passage, a first radial oil passage branch passage, and a first axial oil passage branch passage that are connected in sequence; the cooling oil flow direction in the axial oil passage main passage is opposite to the cooling oil flow direction in the first axial oil passage branch passage;

[0019] The first oil inlet pipe is extended along the axial direction of the rotor assembly, and the oil inlet end is inserted into the first axial oil branch.

[0020] The axial oil main passage, the first radial oil branch passage and the first axial oil branch passage are connected in sequence to form a semi-enclosed structure similar to a U shape. On the one hand, the second oil cooling structure can be avoided. On the other hand, the structure of the end cover itself is fully utilized to ensure precise docking with the first oil inlet pipe.

[0021] In some embodiments, a step surface is formed on the inner peripheral wall of the end cover; the second oil cooling structure includes:

[0022] A second oil injection ring is clamped inside the end cover and is located radially outside the first end of the stator assembly; the outer peripheral surface of the second oil injection ring abuts against the inner peripheral wall of the end cover, one end surface abuts against the step surface, and the other end surface abuts against the docking surface of the housing;

[0023] Among them, an annular flow channel is provided on the outer peripheral surface of the second oil injection ring, and the annular flow channel is connected to the oil main passage; a plurality of second oil injection holes are provided on the second oil injection ring, and the plurality of second oil injection holes are all connected to the annular flow channel, and the plurality of second oil injection holes are all facing the first end of the stator assembly.

[0024] The second oil cooling structure is designed as a second oil spray ring and is squeezed and fixed between the docking surface and the step surface of the shell. On the first hand, there is no need to set a mounting bracket on the second oil cooling structure, thereby reducing the mounting points of the end cover; on the second hand, the second oil spray ring has a large coverage area and can also spray oil to cool the outer peripheral surface of the first end of the stator assembly; on the third hand, the first end of the stator assembly is the outlet end, and the second oil cooling structure is arranged on the radial periphery of the first end of the stator assembly, which will not affect the outlet.

[0025] In some embodiments, the main oil passage includes an axial main oil passage and a second radial oil passage branch which are interconnected; an oil outlet end of the second radial oil passage branch faces the annular flow channel.

[0026] The main oil passage adopts the above structure, which makes full use of the structure of the end cover, ensuring that the first axial oil passage branch is accurately connected with the first oil inlet pipe, and the second radial oil passage branch is accurately connected with the annular flow channel.

[0027] In some embodiments, the third oil cooling structure is coaxially arranged with the fourth oil cooling structure and is coaxial with the rotor assembly;

[0028] A connecting pipe is provided between the third oil cooling structure and the fourth oil cooling structure; the oil inlet end of the connecting pipe is connected with the oil outlet end of the second oil inlet branch, and the connecting pipe has a radially outer oil end and a radially inner oil outlet end, the radially outer oil end is connected with the oil inlet end of the fourth oil cooling structure, and the radially inner oil outlet end is connected with the oil inlet end of the third oil cooling structure.

[0029] The connecting pipe connects the third oil cooling structure and the fourth oil cooling structure, that is, the third oil cooling structure and the fourth oil cooling structure share an oil inlet, which is connected to the oil outlet end of the second oil inlet branch. This can optimize the structure of the second oil inlet branch, and the second oil inlet branch does not need to branch again, thereby simplifying the oil channel structure of the shell.

[0030] In some embodiments, a second mounting bracket is further provided between the third oil cooling structure and the fourth oil cooling structure, and the second mounting bracket is fixed on the housing.

[0031] The third oil cooling structure and the fourth oil cooling structure are fixed by a common second mounting bracket. On the one hand, the fixing method of the third oil cooling structure and the fourth oil cooling structure can be simplified so that the two can be assembled and fixed at the same time; on the other hand, the mounting points on the shell can be reduced, thereby improving the strength of the shell itself.

[0032] In some embodiments, the third oil cooling structure is a third annular tube, the third annular tube is located at the axial periphery of the second end of the rotor assembly, and the third annular tube is provided with a plurality of third oil spray holes, and the plurality of third oil spray holes are all facing the rotor assembly;

[0033] The fourth oil cooling structure is a fourth annular tube, which is located at the axial periphery of the second end of the stator assembly. The fourth annular tube is provided with a plurality of fourth oil spray holes, and the plurality of fourth oil spray holes are all facing the stator assembly.

[0034] The third oil cooling structure and the fourth oil cooling structure are both designed as annular tube structures, which are simple in structure, easy to manufacture and assemble, and can also make full use of the inner cavity space of the shell to ensure uniform cooling and heat dissipation of the second end of the rotor assembly and the second end of the stator assembly.

[0035] In one possible implementation, a cooling oil channel is formed inside the rotor assembly; a fifth oil spray hole connected to the cooling oil channel is provided at the first end of the rotor assembly, and the fifth oil spray hole faces the first end of the stator assembly; a sixth oil spray hole connected to the cooling oil channel is provided at the second end of the rotor assembly, and the sixth oil spray hole faces the second end of the stator assembly.

[0036] A fifth oil spray hole is arranged at the first end of the rotor assembly, and a sixth oil spray hole is arranged at the second end. When the motor is working, the cooling oil channel can not only cool the rotor assembly through oil, but also cool the stator winding of the stator assembly through oil spray.

[0037] In some embodiments, the rotor assembly comprises:

[0038] The rotating shaft is a hollow shaft, and an oil inlet channel is formed at one end, and the oil inlet channel is connected to the electronic pump; the rotating shaft is also provided with a plurality of radial oil hole groups, and the plurality of radial oil hole groups are distributed at intervals along the axial direction of the rotating shaft;

[0039] A rotor core is sleeved outside the rotating shaft; the rotor core has a plurality of axial flow channels, the plurality of axial flow channels are evenly spaced along the circumference of the rotating shaft, and the plurality of axial flow channels are connected to the plurality of radial oil hole groups in a one-to-one correspondence;

[0040] A first end plate is fixed to the first end surface of the rotor core; a plurality of the fifth oil injection holes are provided on the first end plate, and the plurality of the fifth oil injection holes are connected to the plurality of the axial flow channels in a one-to-one correspondence; and

[0041] A second end plate is fixed to the second end surface of the rotor core; a plurality of the sixth oil injection holes are provided on the second end plate, and the plurality of the sixth oil injection holes are connected to the plurality of the axial flow channels in a one-to-one correspondence;

[0042] Wherein, the oil inlet channel, the plurality of radial oil hole groups and the plurality of axial flow channels form the cooling oil channel.

[0043] In this embodiment, multiple radial oil hole groups are provided on the rotating shaft, multiple axial flow channels are provided on the rotor core, multiple fifth oil injection holes are provided on the first end plate, and multiple sixth oil injection holes are provided on the second end plate. With the above structure, when the motor is working, not only the rotor assembly can be cooled by oil, but also the stator winding of the stator assembly can be cooled by oil spraying.

[0044] In a possible implementation, the stator assembly includes a stator core, and a neutral point lead wire, a U-phase lead wire, a V-phase lead wire, and a W-phase lead wire respectively connected to the lead ends of the stator core.

[0045] The lead wires of the stator core in this embodiment are changed from the original three-phase lead wires to four-phase lead wires, which can realize the neutral point voltage boost of the motor and achieve the purpose of boost charging.

[0046] The present invention also provides a vehicle, comprising the motor cooling system mentioned above.

[0047] The vehicle provided by the present invention adopts the above-mentioned motor cooling system, so the rotor assembly and the stator assembly can be sprayed with oil for cooling, whether the vehicle is driving or stopped for boost charging, thereby improving the cooling effect of the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A schematic cross-sectional structure diagram of a motor cooling system provided by an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the structure of an end cover of a motor cooling system provided by an embodiment of the present invention;

[0051] Figure 3 A schematic cross-sectional structure diagram of an end cover of a motor cooling system provided by an embodiment of the present invention;

[0052] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at the middle circle A;

[0053] Figure 5 A schematic diagram of the structure of a housing of a motor cooling system provided by an embodiment of the present invention;

[0054] Figure 6 A schematic diagram of a partial cross-sectional structure of a housing of a motor cooling system provided by an embodiment of the present invention;

[0055] Figure 7 A schematic structural diagram of a first oil cooling structure of a motor cooling system provided in an embodiment of the present invention;

[0056] Figure 8 A schematic diagram of the structure of a second oil cooling structure of a motor cooling system provided by an embodiment of the present invention;

[0057] Fig. 9 A schematic diagram of the structure of a third oil cooling structure and a fourth oil cooling structure of a motor cooling system provided in an embodiment of the present invention;

[0058] Fig.10 for Fig. 9 Rear view of

[0059] Fig.11 A schematic structural diagram of a rotor assembly of a motor cooling system provided by an embodiment of the present invention;

[0060] Fig.12 A schematic structural diagram of a stator assembly of a motor cooling system provided in an embodiment of the present invention.

[0061] In the figure:

[0062] 1. Housing; 11. First oil inlet branch; 12. Second oil inlet branch; 13. Main oil inlet; 14. Mounting position; 15. Oil inlet pipeline;

[0063] 2. End cover; 21. Axial oil main passage; 22. First radial oil branch passage; 23. First axial oil branch passage; 24. Second radial oil branch passage; 25. Step surface;

[0064] 3. rotor assembly; 31. rotating shaft; 311. oil inlet channel; 312. radial oil hole group; 32. rotor core; 321. axial flow channel; 33. first end plate; 331. fifth oil injection hole; 34. second end plate; 341. sixth oil injection hole;

[0065] 4. stator assembly; 41. stator core; 42. neutral point lead wire; 43. U phase lead wire; 44. V phase lead wire; 45. W phase lead wire;

[0066] 5. First oil cooling structure; 51. First annular pipe; 511. First oil spray hole; 52. First oil inlet pipe; 53. First mounting bracket; 54. First connecting part;

[0067] 6. Second oil cooling structure; 61. Second oil spray ring; 62. Annular flow channel; 63. Second oil spray hole; 64. Sealing ring;

[0068] 7. The third oil cooling structure; 71. The third annular pipe; 711. The third oil injection hole;

[0069] 8. Fourth oil cooling structure; 81. Fourth annular pipe; 811. Fourth oil injection hole;

[0070] 91, connecting pipe; 911, radially outward oil outlet; 912, radially inward oil outlet; 92, second mounting bracket; 93, second connecting portion; 94, third connecting portion; 95, fourth connecting portion;

[0071] 100. Power supply; 200. Vehicle controller; 300. Electronic pump. DETAILED DESCRIPTION

[0072] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0073] Boost charging technology can increase the low voltage of the power grid (such as 220V / 380V) to a higher voltage (such as 400V or 800V) to meet the high voltage requirements of electric vehicle batteries. Specifically, it is mainly reflected in:

[0074] First, boost charging can significantly improve charging efficiency and reduce charging time, which is especially important for fast charging stations. Moreover, boost charging technology enables electric vehicles of different voltage levels to use the same charging station, improving the compatibility and utilization of charging infrastructure.

[0075] Secondly, in order to improve endurance and energy density, modern electric vehicles often use high-voltage battery systems (such as 800V systems). Boost charging technology can ensure that the high-voltage battery system obtains sufficient power input during charging, thereby quickly replenishing energy.

[0076] Thirdly, during the power transmission process, the greater the current, the greater the energy loss on the line. Boost charging technology reduces the current by increasing the voltage, thereby reducing the energy loss during transmission and improving the overall energy utilization efficiency.

[0077] As one of the core components for realizing boost charging technology, the motor's structure and heat dissipation method need to be adjusted accordingly in order to adapt to boost charging.

[0078] During the parking boost charging process, the boost charging current generates resistance loss through the motor windings, which can cause overheating of the stator and rotor inside the motor. If this heat cannot be removed effectively and in a timely manner, the motor temperature will be too high, thereby affecting the performance of the motor and may even damage the motor.

[0079] In the prior art, the cooling methods of motors are mainly divided into water cooling and oil cooling. For the water cooling method, the heat source inside the motor needs to be transferred to the outside through layers of components and then carried away by the water channel. Due to the thermal resistance, there is a temperature gradient from the winding to the casing, and the winding cannot be cooled directly, resulting in temperature accumulation to form local hot spots. More importantly, whether the vehicle is parked for charging or driving, the rotor assembly cannot be cooled, resulting in rotor overheating and failure, and the cooling effect is not ideal.

[0080] For the oil cooling method, the rotating shaft of the rotor assembly is designed as a hollow shaft, and the two end plates are designed with oil circuits. The hollow shaft is connected to the oil circuit to indirectly cool the rotor assembly. However, when the vehicle is parked for charging, the rotor assembly cannot rotate and cannot be effectively cooled, resulting in the rotor overheating and failure, and the cooling effect is not ideal.

[0081] To solve the above technical problems, please refer to Figures 1 to 12The motor cooling system provided by the present invention is now described. The motor cooling system comprises a housing, a rotor assembly 3 and a stator assembly 4; the rotor assembly 3 is rotatably arranged in the housing; the stator assembly 4 is located in the housing and sleeved on the outer periphery of the rotor assembly 3; the rotor assembly 3 and the stator assembly 4 are defined to have a first end and a second end axially opposite to each other; in addition, the motor cooling system further comprises a first oil cooling structure 5, a second oil cooling structure 6, a third oil cooling structure 7 and a fourth oil cooling structure 8 respectively arranged in the inner cavity of the housing.

[0082] Among them, the first oil cooling structure 5 is located at the periphery of the first end of the rotor assembly 3, the second oil cooling structure 6 is located at the periphery of the first end of the stator assembly 4, the third oil cooling structure 7 is located at the periphery of the second end of the rotor assembly 3, and the fourth oil cooling structure 8 is located at the periphery of the second end of the stator assembly 4.

[0083] The housing has a closed cavity, and the rotor assembly 3 and the stator assembly 4 are both located in the closed cavity; the axial ends of the rotor assembly 3 are connected to the housing through bearings. The stator assembly 4 is sleeved on the outer circumference of the rotor assembly 3, and the outer circumference is in contact with the inner circumference of the housing, and a winding is provided on the stator assembly 4. The stator winding has a straight portion and a bent portion, wherein the straight portion is located inside the stator core 41, and the bent portions are located at both ends of the stator core 41. The working principle of the above motor is the same as the working principle of the motor in the prior art, and will not be repeated here.

[0084] When the motor is working normally, the rotor assembly 3 rotates and generates heat; when boost charging, the boost charging current passes through the motor winding to generate resistance loss, which also generates heat. Therefore, during the motor operation and boost charging process, the rotor assembly 3 and the stator assembly 4 need to be cooled and dissipated.

[0085] Specifically, the present embodiment uses the first oil cooling structure 5 and the third oil cooling structure 7 to cool the rotor assembly 3, and uses the second oil cooling structure 6 and the fourth oil cooling structure 8 to cool the stator assembly 4. In addition, a cooling oil channel is also provided inside the rotor assembly 3. When the motor is operating normally, the cooling oil channel inside the rotor assembly 3 also cools the rotor assembly 3.

[0086] It should be noted that the above definition that the rotor assembly 3 has an axially opposite first end and a second end, and the stator assembly 4 also has an axially opposite first end and a second end, is only for the convenience of describing the specific positions of the above four oil cooling structures; and the first end of the rotor assembly 3 and the first end of the stator assembly 4 are the same axial end. In addition, the first end of the stator assembly 4 is the outlet end, and the second end is the non-outlet end.

[0087] The first oil cooling structure 5, the second oil cooling structure 6, the third oil cooling structure 7 and the fourth oil cooling structure 8 are respectively connected to the oil inlet pipeline 15. In addition, the cooling oil channel inside the rotor assembly 3 is also connected to the oil inlet pipeline 15; the oil inlet pipeline 15 is connected to the electronic pump 300, the electronic pump 300 is electrically connected to the vehicle controller 200, and the vehicle controller 200 is also electrically connected to the motor.

[0088] Specifically, when the vehicle is running, the vehicle controller 200 transmits the working signal of the motor to the electronic pump 300. After receiving the working signal, the electronic pump 300 pumps the cooling oil into the first oil cooling structure 5, the second oil cooling structure 6, the third oil cooling structure 7, the fourth oil cooling structure 8 and the cooling oil passage of the rotor assembly 3 through the oil inlet pipeline 15. The first oil cooling structure 5 and the third oil cooling structure 7 spray oil to both ends of the rotor assembly 3 respectively, and the cooling oil passage sprays oil to the inside of the rotor assembly 3 to cool and dissipate the heat of the rotor assembly 3. The second oil cooling structure 6 and the fourth oil cooling structure 8 spray oil to both ends of the stator assembly 4 respectively to cool and dissipate the heat of the stator assembly 4.

[0089] When the vehicle is parked for boost charging, the vehicle power supply 100 (12V) supplies power to the electronic pump 300 and the vehicle controller 200. The vehicle controller 200 transmits the charging signal to the electronic pump 300. After receiving the charging signal, the electronic pump 300 pumps the cooling oil into the first oil cooling structure 5, the second oil cooling structure 6, the third oil cooling structure 7, the fourth oil cooling structure 8 and the cooling oil channel of the rotor assembly 3 through the oil inlet pipeline 15. Since the rotor assembly 3 is not running, the cooling oil channel cannot spray oil, and the first oil cooling structure 5 and the third oil cooling structure 7 are mainly used to spray oil to the two ends of the rotor assembly 3 to cool and dissipate the heat of the rotor assembly 3. The second oil cooling structure 6 and the fourth oil cooling structure 8 spray oil to the two ends of the stator assembly 4 to cool and dissipate the heat of the stator assembly 4.

[0090] Compared with the prior art, the motor cooling system provided by the present invention has a first oil cooling structure 5 arranged on the periphery of the first end of the rotor assembly 3, and a third oil cooling structure 7 arranged on the periphery of the second end of the rotor assembly 3. Whether the vehicle is in the process of driving or in the process of parking and boost charging, the first oil cooling structure 5 and the third oil cooling structure 7 can spray oil to cool the rotor assembly 3 to reduce the temperature of the rotor assembly 3 and prevent the rotor assembly 3 from overheating and failure; the second oil cooling structure 6 is arranged on the periphery of the first end of the stator assembly 4, and the fourth oil cooling structure 8 is arranged on the periphery of the second end of the stator assembly 4. Whether the vehicle is in the process of driving or in the process of parking and boost charging, the second oil cooling structure 6 and the fourth oil cooling structure 8 can spray oil to cool the stator assembly 4 to improve the cooling effect of the stator assembly 4.

[0091] In some embodiments, the housing may be Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The structure shown, see Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The casing includes a shell 1 and an end cover 2, and the shell 1 is connected to the end cover 2 to form a closed cavity. The shell 1 is provided with a first oil inlet branch 11 and a second oil inlet branch 12, and the inlet end of the first oil inlet branch 11 and the inlet end of the second oil inlet branch 12 are both connected to the electronic pump 300; the end cover 2 is provided with an oil passage; the first oil inlet branch 11 is connected to the oil passage, and the oil passage is respectively connected to the first oil cooling structure 5 and the second oil cooling structure 6; the second oil inlet branch 12 is respectively connected to the third oil cooling structure 7 and the fourth oil cooling structure 8.

[0092] The housing 1 is the main part of the casing, and one side of the housing is open to facilitate the installation of the rotor assembly 3 and the stator assembly 4. The end cover 2 is sealed on the open surface of the housing 1. The two ends of the rotor assembly 3 are fixed to the housing 1 and the end cover 2 respectively through bearings.

[0093] The housing 1 is also provided with a mounting position 14 for mounting an electronic pump 300, and the electronic pump 300 is connected to the first oil inlet branch 11 and the second oil inlet branch 12 through an oil inlet pipeline 15; specifically, the first oil inlet branch 11 and the second oil inlet branch 12 share a total oil inlet port 13, and the total oil inlet port 13 is connected to the oil inlet pipeline 15, such as Figure 6 shown.

[0094] Since the electronic pump 300 is mounted on the housing 1, the oil inlet pipeline 15 is also provided on the housing 1. It can be understood that, on the housing 1, an oil inlet flow channel is provided between the mounting position 14 and the total oil inlet port 13, and the oil inlet flow channel is the oil inlet pipeline 15. The position of the total oil inlet port 13 is determined according to the position of the mounting position 14. Preferably, the total oil inlet port 13 is close to the mounting position 14, so that the structure of the oil inlet flow channel can be optimized.

[0095] In this embodiment, the main oil inlet 13 is also located close to the third oil cooling structure 7 and the fourth oil cooling structure 8, so that the structure of the second oil inlet branch 12 can be optimized. The first oil inlet branch 11 extends axially and is close to the radial outer peripheral surface of the housing 1. It should be noted that a cooling water channel can also be provided on the housing 1 to dissipate heat from the stator assembly 4 using water cooling.

[0096] By arranging a first oil inlet branch 11 and a second oil inlet branch 12 on the shell 1, and arranging an oil main passage on the end cover 2, the shell 1 and the end cover 2 are connected to the above-mentioned four oil cooling structures respectively by utilizing their own structures, without the need for external pipelines, thereby simplifying the structure of the motor oil cooling system and optimizing the circulation path of the cooling oil.

[0097] In some embodiments, the first oil cooling structure 5 may be configured as follows: Figure 2, Figure 3 and Figure 7 The structure shown, see Figure 2 , Figure 3 and Figure 7 The first oil cooling structure 5 includes a first annular tube 51, a first oil inlet pipe 52 and a first mounting bracket 53. The first annular tube 51 is located at the axial periphery of the first end of the rotor assembly 3 and is coaxially arranged with the rotor assembly 3; a plurality of first oil injection holes 511 are arranged on the first annular tube 51, and each of the first oil injection holes 511 faces the first end of the rotor assembly 3; the oil inlet end of the first oil inlet pipe 52 is connected to the oil outlet end of the oil passage, and the oil outlet end is connected to the oil inlet end of the first annular tube 51; the first mounting bracket 53 is arranged on the first annular tube 51 and fixed on the end cover 2.

[0098] The first annular tube 51 is arranged around the first end of the rotor assembly 3 and is provided with a plurality of first oil injection holes 511 distributed at intervals along the circumferential direction. Even when the rotor assembly 3 is not rotating, it can ensure uniform oil injection to the first end thereof, ensure the uniform temperature of the first end surface of the rotor assembly 3, and avoid local hot spot problems.

[0099] The first oil inlet pipe 52 extends in a direction away from the rotor assembly 3 and is inserted into the oil main passage. The first oil inlet pipe 52 serves to connect the oil main passage and the first annular pipe 51. Preferably, a first connecting portion 54 is provided at the oil outlet end of the first oil inlet pipe 52, and the first connecting portion 54 is also sleeved on the first annular pipe 51. The first connecting portion 54 is similar to a three-way valve and serves to increase the connection strength between the first oil inlet pipe 52 and the first annular pipe 51.

[0100] At least two first mounting brackets 53 are also provided on the first annular tube 51 . The first mounting brackets 53 are fixed to the end cover 2 by bolts to improve the fixing strength of the first cooling structure.

[0101] The main body of the first cooling structure is an annular tubular structure, which can fully utilize the inner cavity space of the end cover 2 and ensure uniform cooling and heat dissipation of the first end of the rotor assembly 3.

[0102] In some embodiments, the oil passage can be Figure 3 The structure shown, see Figure 3 The main oil passage includes an axial oil main passage 21, a first radial oil branch passage 22 and a first axial oil branch passage 23 which are connected in sequence; the cooling oil flow direction in the axial oil main passage 21 is opposite to the cooling oil flow direction in the first axial oil branch passage 23; the first oil inlet pipe 52 is extended along the axial direction of the rotor assembly 3, and the oil inlet end is inserted into the first axial oil branch passage 23.

[0103] The axial oil passage main passage 21 is connected to the first oil inlet branch 11. It should be noted that the oil inlet of the axial oil passage main passage 21 extends to the docking surface of the end cover 2, the oil outlet of the first oil inlet branch 11 extends to the docking surface of the housing 1, and the oil inlet of the axial oil passage main passage 21 is completely axially docked with the oil outlet of the first oil inlet branch 11.

[0104] The first radial oil flow branch 22 and the first axial oil flow branch 23 are used to supply oil to the first oil inlet pipe 52. The axial oil flow main path 21, the first radial oil flow branch 22 and the first axial oil flow branch 23 are connected in sequence to form a semi-enclosed structure similar to a U-shaped structure. On the one hand, the second oil cooling structure 6 can be avoided. On the other hand, the structure of the end cover 2 itself is fully utilized to ensure precise docking with the first oil inlet pipe 52.

[0105] Preferably, a sealing ring is provided between the insertion end of the first oil inlet pipe 52 and the first axial oil branch passage 23 .

[0106] In some embodiments, the second oil cooling structure 6 may be configured as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 The structure shown, see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 , a step surface 25 is formed on the inner peripheral wall of the end cover 2; the second oil cooling structure 6 includes a second oil injection ring 61. The second oil injection ring 61 is clamped inside the end cover 2 and is located at the radial periphery of the first end of the stator assembly 4; the outer peripheral surface of the second oil injection ring 61 abuts against the inner peripheral wall of the end cover 2, one end surface abuts against the step surface 25, and the other end surface abuts against the docking surface of the housing 1.

[0107] Among them, an annular flow channel 62 is provided on the outer peripheral surface of the second oil injection ring 61, and the annular flow channel 62 is connected to the main oil passage; a plurality of second oil injection holes 63 are also provided on the second oil injection ring 61, and the plurality of second oil injection holes 63 are all connected to the annular flow channel 62, and the plurality of second oil injection holes 63 are all facing the first end of the stator assembly 4.

[0108] Preferably, two sealing rings 64 are further provided between the outer circumferential surface of the second oil injection ring 61 and the inner circumferential wall of the end cover 2 , and the two sealing rings 64 are respectively located at two axial ends of the annular flow channel 62 .

[0109] The cooling oil enters the annular flow channel 62 through the oil main passage, and then is sprayed toward the first end of the stator assembly 4 through the plurality of second oil spray holes 63 to cool the stator assembly 4. Preferably, the plurality of second oil spray holes 63 are evenly spaced along the circumferential direction, and the plurality of second oil spray holes 63 can be arranged in multiple rows along the axial direction.

[0110] Since the first oil cooling structure 5 and the second oil cooling structure 6 are both arranged in the inner cavity of the end cover 2, and the axial dimension of the end cover 2, that is, the cavity depth, is relatively small, in order to make full use of the space in the inner cavity of the end cover 2, the second oil cooling structure 6 is designed as a second oil injection ring 61, and is squeezed and fixed between the docking surface and the step surface 25 of the shell 1. On the first hand, there is no need to set a mounting bracket on the second oil cooling structure 6, thereby reducing the mounting points of the end cover 2 and improving the strength of the end cover 2 itself; on the second hand, the second oil injection ring 61 has a large coverage area and can also spray oil for cooling the outer peripheral surface of the first end of the stator assembly 4, thereby increasing the cooling area of ​​the stator assembly 4; on the third hand, the first end of the stator assembly 4 is the outlet end, and the second oil cooling structure 6 is arranged on the radial periphery of the first end of the stator assembly 4, which will not affect the outlet.

[0111] Preferably, the second oil spray hole 63 is a trumpet-shaped structure, with its large diameter end facing the flow channel and its small diameter end facing the stator assembly 4. The trumpet-shaped second oil spray hole 63 can increase the outlet speed of the cooling oil, make the cooling oil spray range wider, and increase the effective heat dissipation area.

[0112] In some embodiments, the oil passage can also be Figure 3 and Figure 4 The structure shown, see Figure 3 and Figure 4 The main oil passage includes an axial oil passage 21 and a second radial oil passage branch 24 which are interconnected; the oil outlet end of the second radial oil passage branch 24 faces the annular flow channel 62 .

[0113] The main oil passage and the second radial oil passage branch 24 are arranged in a cross shape, and the second radial oil passage branch 24 is arranged in parallel with the first radial oil passage branch 22. The main oil passage adopts the above structure, which makes full use of the structure of the end cover 2, ensuring that the first axial oil passage branch 23 is accurately connected with the first oil inlet pipe 52, and the second radial oil passage branch 24 is accurately connected with the annular flow channel 62.

[0114] In some embodiments, the third oil cooling structure 7 and the fourth oil cooling structure 8 may be configured as follows: Figure 1 , Fig. 9 and Fig.10 The structure shown, see Figure 1 , Fig. 9 and Fig.10 The third oil cooling structure 7 is coaxially arranged with the fourth oil cooling structure 8 and is coaxial with the rotor assembly 3; a connecting pipe 91 is provided between the third oil cooling structure 7 and the fourth oil cooling structure 8; the oil inlet end of the connecting pipe 91 is connected with the oil outlet end of the second oil inlet branch 12, and the connecting pipe 91 has a radially outer oil end 911 and a radially inner oil outlet end 912, the radially outer oil end 911 is connected with the oil inlet end of the fourth oil cooling structure 8, and the radially inner oil outlet end 912 is connected with the oil inlet end of the third oil cooling structure 7.

[0115] The third oil cooling structure 7 is coaxially arranged with the fourth oil cooling structure 8 and is coaxial with the rotor assembly 3. That is to say, the third oil cooling structure 7 is arranged around the second end of the rotor assembly 3. Even when the rotor assembly 3 is not rotating, it can ensure uniform oil spraying to the second end thereof, thereby ensuring the uniform temperature of the second end surface of the rotor assembly 3 and avoiding local hot spot problems.

[0116] Similarly, the fourth oil cooling structure 8 is arranged around the second end of the stator assembly 4, and can spray oil evenly to the second end of the stator assembly 4 to ensure the uniform temperature of the second end of the stator assembly 4 and avoid local hot spot problems.

[0117] The connecting pipe 91 connects the third oil cooling structure 7 and the fourth oil cooling structure 8, that is, the third oil cooling structure 7 and the fourth oil cooling structure 8 share an oil inlet, which is connected to the oil outlet end of the second oil inlet branch 12. This can optimize the structure of the second oil inlet branch 12, and the second oil inlet branch 12 does not need to branch again, thereby simplifying the oil channel structure of the shell 1.

[0118] Preferably, a second connecting portion 93 is provided on the connecting pipe 91, and the oil inlet end of the second connecting portion 93 is inserted into the second oil inlet branch 12; a third connecting portion 94 is provided at the radially outer oil end 911, and the third connecting portion 94 is also connected to the fourth oil cooling structure 8; a fourth connecting portion 95 is provided at the radially inner oil outlet end 912, and the fourth connecting portion 95 is also connected to the third oil cooling structure 7.

[0119] The above three connecting parts are similar to three-way valves. The second connecting part 93 serves to increase the supporting strength of the connecting pipe 91, the third connecting part 94 serves to increase the connection strength between the connecting pipe 91 and the fourth oil cooling structure 8, and the fourth connecting part 95 serves to increase the connection strength between the connecting pipe 91 and the third oil cooling structure 7.

[0120] In some embodiments, the third oil cooling structure 7 and the fourth oil cooling structure 8 may also be configured as follows: Fig. 9 and Fig.10 The structure shown, see Fig. 9 and Fig.10 A second mounting bracket 92 is further provided between the third oil cooling structure 7 and the fourth oil cooling structure 8 , and the second mounting bracket 92 is fixed on the housing 1 .

[0121] Preferably, a plurality of second mounting brackets 92 are arranged at equal intervals along the circumferential direction, and each second mounting bracket 92 is fixed to the housing 1 by bolts.

[0122] The third oil cooling structure 7 and the fourth oil cooling structure 8 are fixed by a common second mounting bracket 92. On the one hand, the fixing method of the third oil cooling structure 7 and the fourth oil cooling structure 8 can be simplified so that the two can be assembled and fixed at the same time; on the other hand, the number of mounting points on the shell 1 can be reduced, thereby improving the strength of the shell 1 itself.

[0123] In some embodiments, the third oil cooling structure 7 and the fourth oil cooling structure 8 may also be configured as follows: Fig. 9 and Fig.10 The structure shown, see Fig. 9 and Fig.10 The third oil cooling structure 7 is a third annular tube 71, which is located at the axial periphery of the second end of the rotor assembly 3. The third annular tube 71 is provided with a plurality of third oil spray holes 711, and the plurality of third oil spray holes 711 are all facing the rotor assembly 3; the fourth oil cooling structure 8 is a fourth annular tube 81, which is located at the axial periphery of the second end of the stator assembly 4. The fourth annular tube 81 is provided with a plurality of fourth oil spray holes 811, and the plurality of fourth oil spray holes 811 are all facing the stator assembly 4.

[0124] The third oil cooling structure 7 and the fourth oil cooling structure 8 are both designed as annular tube structures, which have simple structures and are easy to manufacture and assemble. In addition, they can fully utilize the inner cavity space of the shell 1 to ensure uniform cooling and heat dissipation of the second end of the rotor assembly 3 and the second end of the stator assembly 4.

[0125] In some embodiments, the rotor assembly may be configured as follows: Fig.11 The structure shown, see Fig.11 A cooling oil channel is formed inside the rotor assembly 3; a fifth oil injection hole 331 connected to the cooling oil channel is provided at the first end of the rotor assembly, and the fifth oil injection hole 331 faces the first end of the stator assembly 4; a sixth oil injection hole 341 connected to the cooling oil channel is provided at the second end of the rotor assembly, and the sixth oil injection hole 341 faces the second end of the stator assembly 4.

[0126] The stator assembly 4 is provided with a winding. The stator winding has a straight portion and a bent portion, wherein the straight portion is located inside the stator core 41, and the bent portions are located at both ends of the stator core 41.

[0127] This embodiment utilizes the cooling oil channel structure of the rotor assembly 3, and a fifth oil injection hole 331 and a sixth oil injection hole 341 are respectively arranged at both ends of the rotor assembly 3. When the motor is working, the cooling oil channel can not only cool the rotor assembly 3 with oil, but also spray oil to the bent part of the stator winding through the fifth oil injection hole 331 and the sixth oil injection hole 341 to cool the stator winding, so as to reduce the temperature of the stator winding.

[0128] Specifically, when the motor is working, the vehicle controller 200 transmits the working signal of the motor to the electronic pump 300. After receiving the working signal, the electronic pump 300 pumps the cooling oil into the cooling oil channel through the oil inlet pipeline 15. The cooling oil flows in the cooling oil channel to take away the heat of the rotor core 32. The cooling oil entering the cooling oil channel can also be sprayed outward through the fifth oil injection hole 331 and the sixth oil injection hole 341 to cool and dissipate heat from the bent portion of the stator assembly 4.

[0129] In some embodiments, the rotor assembly 3 may be configured as follows: Fig.11 The structure shown, see Fig.11 The rotor assembly 3 includes a rotating shaft 31 , a rotor core 32 , a first end plate 33 and a second end plate 34 . The rotating shaft 31 is a hollow shaft, and an oil inlet channel 311 is formed at one end, and the oil inlet channel 311 is connected to the electronic pump 300; a plurality of radial oil hole groups 312 are also provided on the rotating shaft 31, and the plurality of radial oil hole groups 312 are distributed at intervals along the axial direction of the rotating shaft 31; the rotor core 32 is sleeved outside the rotating shaft 31; the rotor core 32 has a plurality of axial flow channels 321, and the plurality of axial flow channels 321 are distributed at equal intervals along the circumference of the rotating shaft 31, and the plurality of axial flow channels 321 are connected to the plurality of radial oil hole groups 312 in a one-to-one correspondence; the first end plate 33 is fixed to the first end surface of the rotor core 32; a plurality of fifth oil injection holes 331 are provided on the first end plate 33, and the plurality of fifth oil injection holes 331 are connected to the plurality of axial flow channels 321 in a one-to-one correspondence; the second end plate 34 is fixed to the second end surface of the rotor core 32; a plurality of sixth oil injection holes 341 are provided on the second end plate 34, and the plurality of sixth oil injection holes 341 are connected to the plurality of axial flow channels 321 in a one-to-one correspondence.

[0130] The oil inlet channel 311 , the plurality of radial oil hole groups 312 and the plurality of axial flow channels 321 form a cooling oil channel.

[0131] The two ends of the rotating shaft 31 are fixed to the housing 1 and the end cover 2 respectively through bearings. The rotor core 32 is sleeved on the rotating shaft 31, and the first end plate 33 and the second end plate 34 are arranged at the axial ends of the rotor core 32 to fix the rotor core 32. The structure and working principle of the rotor assembly 3 are the same as those of the rotor assembly 3 in the prior art, and will not be repeated here.

[0132] The windings of the stator assembly 4 are arranged inside and at both ends of the stator core 41, and are located radially outside the rotor core 32. Specifically, when the motor is working, the vehicle controller 200 transmits the working signal of the motor to the electronic pump 300. After receiving the working signal, the electronic pump 300 pumps the cooling oil into the oil inlet channel 311 through the oil inlet pipeline 15, and then enters the inner cavity of the rotating shaft 31. The cooling oil rotates with the rotating shaft 31, and at the same time passes through each radial oil hole group 312 into the corresponding axial flow channel 321. The cooling oil flows in the axial flow channel 321 to take away the heat of the rotor core 32.

[0133] The cooling oil entering the axial flow channel 321 can also be sprayed outward through the corresponding fifth oil spray hole 331 and the sixth oil spray hole 341 to cool and dissipate heat from the bent portion of the stator winding.

[0134] It should be noted that the fifth oil injection hole 331 can be arranged on the communication path between the radial oil hole group 312 and the axial flow channel 321, that is, it can be arranged at the head end of the axial flow channel 321, and it can also be arranged at the tail end of the axial flow channel 321. Similarly, the sixth oil injection hole 341 can be arranged at the head end of the axial flow channel 321, and it can also be arranged at the tail end of the axial flow channel 321. Preferably, corresponding to any axial flow channel 321, the fifth oil injection hole 331 or the sixth oil injection hole 341 is arranged at its head end, and the sixth oil injection hole 341 or the fifth oil injection hole 331 is arranged at its tail end.

[0135] Specifically, taking one of the axial flow channels 321 as an example, the cooling oil in the inner cavity of the rotating shaft 31 enters the axial flow channel 321 through the radial oil hole group 312, a small portion of the cooling oil passes through the fifth oil injection hole 331 located at the head end to be sprayed toward the first end of the stator assembly 4, most of the cooling oil flows in the axial flow channel 321, and a small portion of the cooling oil passes through the sixth oil injection hole 341 located at the tail end to be sprayed toward the second end of the stator assembly 4.

[0136] In some embodiments, the stator assembly 4 may be configured as follows: Fig.12 The structure shown, see Fig.12 The stator assembly 4 includes a stator core 41, and a neutral point lead wire 42, a U-phase lead wire 43, a V-phase lead wire 44 and a W-phase lead wire 45 respectively connected to the lead ends of the stator core 41.

[0137] The lead end of the stator core 41 is the first end of the stator assembly 4. The lead wires of the stator core 41 in this embodiment are changed from the original three-phase lead wires to four-phase lead wires, namely, the neutral point lead wire 42, the U-phase lead wire 43, the V-phase lead wire 44 and the W-phase lead wire 45. The lead wires of each phase are fixed to the adapter by bolts, and the electrical connection between the lead wires of each phase and the vehicle controller is realized through the copper busbar installation position 14, so as to realize the neutral point boost of the motor and achieve the purpose of boost charging.

[0138] Based on the same inventive concept, an embodiment of the present application also provides a vehicle, comprising the above-mentioned motor cooling system.

[0139] The vehicle provided by the present invention adopts the above-mentioned motor cooling system, so that the rotor assembly 3 and the stator assembly 4 can be sprayed with oil for cooling, whether the vehicle is driving or parking for boost charging, thereby improving the cooling effect of the motor and extending the service life of the motor.

[0140] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor cooling system, comprising a housing, a rotor assembly (3) and a stator assembly (4); the rotor assembly (3) is rotatably arranged in the housing; the stator assembly (4) is located in the housing and sleeved on the outer circumference of the rotor assembly (3); the rotor assembly (3) and the stator assembly (4) both have a first end and a second end axially opposite to each other; characterized in that: The motor cooling system further comprises a first oil cooling structure (5), a second oil cooling structure (6), a third oil cooling structure (7) and a fourth oil cooling structure (8) which are respectively arranged in the housing; The first oil cooling structure (5) is located at the periphery of the first end of the rotor assembly (3), the second oil cooling structure (6) is located at the periphery of the first end of the stator assembly (4), the third oil cooling structure (7) is located at the periphery of the second end of the rotor assembly (3), and the fourth oil cooling structure (8) is located at the periphery of the second end of the stator assembly (4).

2. The motor cooling system according to claim 1, characterized in that: The casing comprises a shell (1) and an end cover (2), wherein the end cover (2) is butt-jointed with the shell (1); a first oil inlet branch (11) and a second oil inlet branch (12) are provided on the shell (1), and the inlet end of the first oil inlet branch (11) and the inlet end of the second oil inlet branch (12) are both connected to the electronic pump (300); and an oil main passage is provided on the end cover (2); The first oil inlet branch (11) is in communication with the oil main passage, and the oil main passage is in communication with the first oil cooling structure (5) and the second oil cooling structure (6) respectively; The second oil inlet branch (12) is respectively connected to the third oil cooling structure (7) and the fourth oil cooling structure (8).

3. The motor cooling system according to claim 2, characterized in that: The first oil cooling structure (5) comprises: a first annular tube (51) located at the axial periphery of the first end of the rotor assembly (3) and coaxially arranged with the rotor assembly (3); a plurality of first oil injection holes (511) are arranged on the first annular tube (51), and each of the first oil injection holes (511) faces the first end of the rotor assembly (3); A first oil inlet pipe (52), the oil inlet end of which is in communication with the oil outlet end of the oil main passage, and the oil outlet end of which is in communication with the oil inlet end of the first annular pipe (51); and A first mounting bracket (53) is arranged on the first ring tube (51) and fixed on the end cover (2).

4. The motor cooling system according to claim 3, characterized in that: The main oil passage comprises an axial oil passage main passage (21), a first radial oil passage branch passage (22) and a first axial oil passage branch passage (23) which are connected in sequence; the cooling oil flow direction in the axial oil passage main passage (21) is opposite to the cooling oil flow direction in the first axial oil passage branch passage (23); The first oil inlet pipe (52) is arranged to extend along the axial direction of the rotor assembly (3), and the oil inlet end is inserted into the first axial oil branch (23).

5. The motor cooling system according to claim 2, characterized in that: A step surface (25) is formed on the inner peripheral wall of the end cover (2); the second oil cooling structure (6) comprises: A second oil injection ring (61) is clamped inside the end cover (2) and is located radially outside the first end of the stator assembly (4); the outer peripheral surface of the second oil injection ring (61) abuts against the inner peripheral wall of the end cover (2), one end surface abuts against the step surface (25), and the other end surface abuts against the docking surface of the housing (1); An annular flow channel (62) is provided on the outer peripheral surface of the second oil injection ring (61), and the annular flow channel (62) is connected to the main oil passage; a plurality of second oil injection holes (63) are provided on the second oil injection ring (61), and the plurality of second oil injection holes (63) are all connected to the annular flow channel (62), and the plurality of second oil injection holes (63) are all oriented toward the first end of the stator assembly (4).

6. The motor cooling system according to claim 5, characterized in that: The main oil passage comprises an axial main oil passage (21) and a second radial oil passage branch (24) which are interconnected; the oil outlet end of the second radial oil passage branch (24) faces the annular flow channel (62).

7. The motor cooling system according to claim 2, characterized in that: The third oil cooling structure (7) is coaxially arranged with the fourth oil cooling structure (8) and is coaxial with the rotor assembly (3); A connecting pipe (91) is provided between the third oil cooling structure (7) and the fourth oil cooling structure (8); the oil inlet end of the connecting pipe (91) is connected to the oil outlet end of the second oil inlet branch (12); the connecting pipe (91) has a radially outward oil end (911) and a radially inward oil outlet end (912); the radially outward oil end (911) is connected to the oil inlet end of the fourth oil cooling structure (8), and the radially inward oil outlet end (912) is connected to the oil inlet end of the third oil cooling structure (7).

8. The motor cooling system according to claim 7, characterized in that: A second mounting bracket (92) is also provided between the third oil cooling structure (7) and the fourth oil cooling structure (8), and the second mounting bracket (92) is fixed on the housing (1).

9. The motor cooling system according to claim 7, characterized in that: The third oil cooling structure (7) is a third annular tube (71), the third annular tube (71) is located at the axial periphery of the second end of the rotor assembly (3), the third annular tube (71) is provided with a plurality of third oil spray holes (711), and the plurality of third oil spray holes (711) are all oriented toward the rotor assembly (3); The fourth oil cooling structure (8) is a fourth annular tube (81), the fourth annular tube (81) is located at the axial periphery of the second end of the stator assembly (4), the fourth annular tube (81) is provided with a plurality of fourth oil spray holes (811), and the plurality of fourth oil spray holes (811) are all oriented toward the stator assembly (4).

10. The motor cooling system according to claim 1, characterized in that: A cooling oil channel is formed inside the rotor assembly (3); a fifth oil injection hole (331) communicating with the cooling oil channel is provided at the first end of the rotor assembly, and the fifth oil injection hole (331) faces the first end of the stator assembly (4); a sixth oil injection hole (341) communicating with the cooling oil channel is provided at the second end of the rotor assembly, and the sixth oil injection hole (341) faces the second end of the stator assembly (4).

11. The motor cooling system according to claim 10, characterized in that: The rotor assembly (3) comprises: A rotating shaft (31); the rotating shaft (31) is a hollow shaft, and an oil inlet channel (311) is formed at one end, and the oil inlet channel (311) is communicated with the electronic pump (300); a plurality of radial oil hole groups (312) are also provided on the rotating shaft (31), and the plurality of radial oil hole groups (312) are distributed at intervals along the axial direction of the rotating shaft (31); A rotor core (32) is sleeved outside the rotating shaft (31); the rotor core (32) has a plurality of axial flow channels (321), the plurality of axial flow channels (321) are evenly spaced along the circumference of the rotating shaft (31), and the plurality of axial flow channels (321) are connected to the plurality of radial oil hole groups (312) in a one-to-one correspondence; a first end plate (33) fixed to a first end surface of the rotor core (32); a plurality of fifth oil injection holes (331) are provided on the first end plate (33), and the plurality of fifth oil injection holes (331) are connected to the plurality of axial flow channels (321) in a one-to-one correspondence; and A second end plate (34) is fixed to the second end surface of the rotor core (32); a plurality of sixth oil injection holes (341) are provided on the second end plate (34), and the plurality of sixth oil injection holes (341) are connected to the plurality of axial flow channels (321) in a one-to-one correspondence; The oil inlet channel (311), the plurality of radial oil hole groups (312) and the plurality of axial flow channels (321) form the cooling oil channel.

12. The motor cooling system according to claim 1, characterized in that: The stator assembly (4) comprises a stator core (41), and a neutral point lead wire (42), a U-phase lead wire (43), a V-phase lead wire (44), and a W-phase lead wire (45) respectively connected to the lead ends of the stator core (41).

13. A vehicle, characterized in that: The motor cooling system comprises the motor cooling system according to any one of claims 1 to 12.

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