Oil-cooled electric machine

Abstract

The application discloses an oil-cooled motor, which comprises a shell, a motor shell, an oil collecting shell, a mounting shell and a mounting portion, the oil collecting shell, the mounting shell and the mounting portion are sequentially arranged on the outer circumferential side of the motor shell in a circumferential direction, the mounting shell is provided with a communication port which is in communication with the outside; a driving assembly is arranged in the motor shell; a circulating assembly comprises a filter, a pump body and a cooling member, the filter and the pump body are detachably mounted in the mounting shell through the communication port, and are respectively used for filtering oil medium and providing power; the cooling member is detachably mounted in the mounting portion and is used for cooling the oil medium; an oil circuit assembly is sequentially arranged in the motor shell, the oil collecting shell, the mounting shell and the mounting portion to form an oil medium circulating loop. The oil-cooled motor aims to improve the maintainability and stability of the motor as a whole.

Description

Technical Field

[0001] This application belongs to the field of motor technology, and in particular relates to an oil-cooled motor. Background Technology

[0002] With the development of the automotive industry, the performance requirements for motors in vehicles are gradually increasing, and the cooling efficiency of the motor itself is a crucial factor affecting motor performance. Currently, for commercial vehicles, considering unsprung mass and layout space, a combination of an electric drive axle and a water-cooled single motor is usually adopted. However, the cooling effect of water-cooled motors is relatively poor, limiting further improvements in motor performance.

[0003] To address the issue of poor cooling performance in water-cooled motors, oil-cooled motors are typically used instead to improve overall cooling efficiency. Oil-cooled motors require sophisticated integration and design capabilities, necessitating the integration of the oil pump, oil filter, and oil cooler onto the motor housing. However, as the operating time of oil-cooled motors increases, the entire motor requires maintenance. Currently, components such as the oil pump, oil filter, and oil cooler are not easily disassembled from the motor housing, impacting maintenance efficiency and leading to unstable motor operation. Utility Model Content

[0004] This application provides an oil-cooled motor, which aims to improve the overall maintainability and stability of the motor.

[0005] This application provides an oil-cooled motor, comprising a housing including a motor housing, an oil collection housing, a mounting housing, and a mounting part, wherein the oil collection housing, the mounting housing, and the mounting part are sequentially arranged circumferentially on the outer periphery of the motor housing, and the mounting housing has a communication port connecting to the outside; a drive assembly disposed inside the motor housing; a circulation assembly including a filter element, a pump body, and a cooling element, wherein the filter element and the pump body are detachably installed inside the mounting housing through the communication port, respectively used for filtering the oil medium and providing power, and the cooling element is detachably installed in the mounting part for cooling the oil medium; and an oil circuit assembly sequentially passing through the motor housing, the oil collection housing, the mounting housing, and the mounting part to form an oil medium circulation loop.

[0006] The oil-cooled motor described above has a cylindrical structure for both the motor housing and the oil collection housing, and the motor housing and the oil collection housing extend in the same direction. The housing also includes an end cover assembly, which includes a first end cover and a second end cover. The first end cover is detachably installed at one side opening of the motor housing and the oil collection housing, and the second end cover is detachably installed at the other side opening of the motor housing and the oil collection housing.

[0007] In the oil-cooled motor described above, the mounting housing and the oil collecting housing are at least partially overlapped, and the outer surface of the mounting housing is sealed to the oil collecting housing, with the communication port of the mounting housing located outside the oil collecting housing.

[0008] The oil-cooled motor described above has a first mounting groove and a second mounting groove extending in the same direction inside the mounting housing, which are used to install the filter element and the pump body, respectively. The ends of the first mounting groove and the second mounting groove are connected. The communication port of the mounting housing is located at the end of the second mounting groove away from the first mounting groove, and the cross-sectional area of ​​the first mounting groove in its own extension direction is smaller than the cross-sectional area of ​​the second mounting groove in its own extension direction.

[0009] In the oil-cooled motor described above, the oil circuit assembly includes a circulating oil circuit pipe and a cooling oil circuit pipe connected together. The circulating oil circuit pipe passes through the oil collection shell, the mounting shell, and the mounting part in sequence, and is connected to the filter element, the pump body, and the cooling element in sequence, so that the oil medium in the oil collection shell is transferred to the cooling oil circuit pipe after being filtered and cooled. The cooling oil circuit pipe passes through the motor housing and the end cover assembly to cool the drive components inside the motor housing at different locations.

[0010] In the oil-cooled motor described above, there are oil leakage gaps between the end cover assembly and the end face of the motor housing, as well as between the end face of the oil collection housing. The end of the cooling oil pipeline is connected to the beginning of the circulating oil pipeline through the oil leakage gap to form an oil medium circulation loop of the circulating oil pipeline, the cooling oil pipeline, and the oil leakage gap.

[0011] The oil-cooled motor described above includes a drive assembly comprising a stator structure and a rotor structure. The cooling oil pipeline includes a first oil guide pipe and a second oil guide pipe. The first oil guide pipe passes through the motor housing and the end cover assembly in sequence to guide the oil medium to the inner side of the rotor structure and the stator structure. The second oil guide pipe passes through the motor housing to guide the oil medium to the outer side of the stator structure.

[0012] In the oil-cooled motor described above, the drive assembly further includes a first bearing. The first bearing is located on the outer peripheral surface of the rotor structure and is close to the first end cover. The first oil guide pipe includes a first connecting pipe, a first drain pipe, and a second drain pipe. The first connecting pipe passes through the motor housing and is connected at one end to the cooling oil circuit pipe. The first drain pipe and the second drain pipe are connected to the other end of the first connecting pipe and both pass through the first end cover. The first drain pipe extends from the first end cover to the first bearing, and the second drain pipe extends from the first end cover into the interior of the rotor structure.

[0013] In the oil-cooled motor described above, the drive assembly also includes a second bearing. The second bearing is located on the outer peripheral surface of the rotor structure and is close to the second end cover. The second oil guide pipe includes a second connecting pipe, a third drain pipe, and a fourth drain pipe. The second connecting pipe passes through the motor housing and is connected at one end to the cooling oil circuit pipe. The third drain pipe and the fourth drain pipe are connected to the other end of the second connecting pipe. The third drain pipe passes through the motor housing and the second end cover in sequence to guide the oil medium to the second bearing. The fourth drain pipe passes through the motor housing and extends from the motor housing to the outside of the stator structure to guide the oil medium to the outside of the stator structure.

[0014] The oil-cooled motor described above includes a third oil guide pipe and a fourth oil guide pipe. The third oil guide pipe extends from inside the oil collection shell to the mounting shell and is connected to the filter element inside the mounting shell. One end of the fourth oil guide pipe is connected to the pump body, and the other end is connected to the cooling element.

[0015] The oil-cooled motor of this application includes a housing, a drive assembly, a circulation assembly, and an oil circuit assembly. The housing includes a motor casing and, circumferentially, an oil collection shell, a mounting shell, and a mounting portion sequentially arranged on the outer periphery of the motor casing. The drive assembly is housed inside the motor casing and serves as the driving body of the oil-cooled motor, capable of being driven by an external mechanical structure to drive its operation. The oil circuit assembly is sequentially arranged through the motor casing, the oil collection shell, the mounting shell, and the mounting portion to form an oil medium circulation loop. As the oil medium passes through the motor casing, it absorbs heat from the drive assembly inside the motor casing, thereby achieving a cooling effect on the drive assembly. The oil collection shell serves to store the oil medium that passes through it. The circulation assembly includes a filter, a pump body, and a cooling component. The filter and pump body are detachably installed in the mounting housing via a connecting port, respectively for filtering the oil medium passing through the mounting housing and providing power. The cooling component is detachably installed in the mounting section for cooling the oil medium passing through the mounting section. After the oil-cooled motor has been operating for a long time, the filter or pump body can be directly disassembled through the connecting port of the mounting housing, or the cooling component can be disassembled through the mounting section. This allows for independent maintenance and cleaning of the filter, pump body, or cooling component. Therefore, the independent design of the mounting housing and mounting section improves the ease of disassembly of the circulation assembly and enhances the overall maintainability and post-maintenance operational stability of the oil-cooled motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the housing and circulation assembly of the oil-cooled motor according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the assembly of the mounting housing and circulation assembly of the oil-cooled motor according to an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the overall structure of the oil-cooled motor according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the cooling oil circuit pipes inside the oil-cooled motor according to an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the stator structure of an oil-cooled motor according to an embodiment of this application.

[0022] Explanation of icon numbers:

[0023] 10. Outer casing; 11. Motor housing; 12. Oil collection housing; 13. Mounting housing; 131. Connecting port; 132. First mounting groove; 133. Second mounting groove; 14. Mounting part; 141. Sleeve structure; 15. End cover assembly; 151. First end cover; 152. Second end cover; 16. Oil leakage gap;

[0024] 20. Drive assembly; 21. Stator structure; 211. Stator core; 212. Stator winding; 213. Core body; 214. Oil guide ring; 215. Oil injection hole; 22. Rotor structure; 221. Oil slinger hole; 23. First bearing; 24. Second bearing;

[0025] 30. Circulation components; 31. Filter components; 32. Pump body; 33. Cooling components;

[0026] 40. Oil circuit assembly; 41. Circulating oil circuit pipeline; 411. Third oil guide pipeline; 412. Fourth oil guide pipeline; 42. Cooling oil circuit pipeline; 421. First oil guide pipeline; 4211. First connecting pipeline; 4212. First oil drain pipeline; 4213. Second oil drain pipeline; 422. Second oil guide pipeline; 4221. Second connecting pipeline; 4222. Third oil drain pipeline; 4223. Fourth oil drain pipeline. Detailed Implementation

[0027] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0028] Please refer to the following: Figures 1 to 5 This application provides an oil-cooled motor, comprising a housing 10, including a motor housing 11, an oil collection housing 12, a mounting housing 13, and a mounting part 14. The oil collection housing 12, the mounting housing 13, and the mounting part 14 are sequentially arranged circumferentially on the outer periphery of the motor housing 11. The mounting housing 13 has a communication port 131 connecting to the outside. A drive assembly 20 is disposed inside the motor housing 11. A circulation assembly 30 includes a filter element 31, a pump body 32, and a cooling element 33. The filter element 31 and the pump body 32 are detachably installed inside the mounting housing 13 through the communication port 131, and are used to filter the oil medium and provide power, respectively. The cooling element 33 is detachably installed in the mounting part 14 for cooling the oil medium. An oil circuit assembly 40 is sequentially disposed through the motor housing 11, the oil collection housing 12, the mounting housing 13, and the mounting part 14 to form an oil medium circulation loop.

[0029] In a specific implementation, the oil-cooled motor of this application embodiment includes a housing 10, a drive assembly 20, a circulation assembly 30, and an oil circuit assembly 40. The housing 10 includes a motor housing 11 and an oil collection shell 12, a mounting shell 13, and a mounting portion 14 arranged sequentially along the outer periphery of the motor housing 11. The drive assembly 20 is disposed inside the motor housing 11. The drive assembly 20 serves as the drive body of the oil-cooled motor and can be driven to connect with an external mechanical structure to drive the external mechanical structure to operate. The oil circuit assembly 40 is sequentially disposed through the motor housing 11, the oil collection shell 12, the mounting shell 13, and the mounting portion 14 to form an oil medium circulation loop. When the oil medium passes through the motor housing 11, it can absorb heat from the drive assembly 20 inside the motor housing 11, thereby achieving a cooling effect on the drive assembly 20. The oil collection shell 12 can store the oil medium that passes through it.

[0030] The circulation assembly 30 includes a filter element 31, a pump body 32, and a cooling element 33. The filter element 31 and the pump body 32 are detachably installed in the mounting housing 13 through the communication port 131, and are used to filter the oil medium passing through the mounting housing 13 and provide power, respectively. The cooling element 33 is detachably installed in the mounting part 14 and is used to cool the oil medium passing through the mounting part 14. After the oil-cooled motor has been working for a long time, the filter element 31 or the pump body 32 can be directly disassembled through the communication port 131 of the mounting housing 13, or the cooling element 33 can be disassembled through the mounting part 14. This allows for independent maintenance and cleaning of the filter element 31, the pump body 32, or the cooling element 33. Therefore, the independent setting of the mounting housing 13 and the mounting part 14 improves the ease of disassembly of the circulation assembly 30 and improves the overall maintainability and post-maintenance operational stability of the oil-cooled motor.

[0031] During the operation of the oil-cooled motor in this embodiment, the pump body 32 of the circulation component 30 can provide the power for the circulation of the oil medium in the oil circuit component 40. Under the power of the pump body 32, the oil medium stored in the oil collection shell 12 can flow to the filter element 31 of the mounting shell 13. After being filtered by the filter element 31, the oil medium reaches the pump body 32 and flows to the cooling element 33 for cooling under the continuous pumping of the pump body 32, thereby reducing the temperature of the oil medium. After the low temperature oil medium reaches the inside of the motor housing 11, it cools the drive component 20. After cooling the drive component 20, the oil medium finally returns to the oil collection shell 12, thus completing a circulation process of the oil medium in the oil circuit component 40.

[0032] The filter element 31 and the pump body 32 are integrated and installed in the mounting housing 13, which makes it easy to install the filter element 31 directly at the inlet of the pump body 32 without setting up extra piping structure between the filter element 31 and the pump body 32. This improves the overall integration of the oil-cooled motor, and the filter element 31 and the pump body 32 can also be easily disassembled, which improves the maintainability of the oil-cooled motor.

[0033] Specifically, such as Figure 3 As shown, the mounting part 14 includes multiple sleeve structures 141 protruding from the outer peripheral surface of the motor housing 11. Each sleeve structure 141 has an internal thread structure, and the multiple sleeve structures 141 are arranged in an array. The cooling component 33 can be detachably connected to the multiple sleeve structures 141 by bolts. The sleeve structures 141 are lightweight and easy to bolt to the cooling component 33, ensuring the overall lightweight design of the oil-cooled motor.

[0034] like Figure 1 and Figure 3 As shown in the embodiment of this application, the oil-cooled motor, wherein, as Figure 1 As shown, both the motor housing 11 and the oil collecting housing 12 have a cylindrical structure, and their extending directions are the same, as... Figure 3 As shown, the housing 10 also includes an end cap assembly 15, which includes a first end cap 151 and a second end cap 152. The first end cap 151 is detachably installed at one side opening of the motor housing 11 and the oil collection housing 12, and the second end cap 152 is detachably installed at the other side opening of the motor housing 11 and the oil collection housing 12.

[0035] In practice, both ends of the motor housing 11 and the oil collection housing 12 are open. The first end cover 151 can be installed at one side opening of the motor housing 11 and the oil collection housing 12, and the second end cover 152 is installed at the other side opening. This seals the internal space of the motor housing 11 and the oil collection housing 12, protecting the internal drive assembly 20, reducing interference from the external environment on the rotation of the drive assembly 20, and preventing leakage of the oil medium inside the motor housing 11 and the oil collection housing 12. Moreover, both the first end cover 151 and the second end cover 152 can be disassembled to maintain or repair the drive assembly 20 inside the motor housing 11, or to clean the inside of the motor housing 11 and the oil collection housing 12, further improving the maintenance efficiency of the motor and enabling the oil-cooled motor to operate more stably after maintenance.

[0036] In some alternative embodiments, the first end cover 151 can be configured as a split structure, with one part detachably installed in the motor housing 11 and the other part detachably installed in the oil collection tank 12. This configuration facilitates the independent disassembly of the end cover according to the maintenance needs of different housings, improving the convenience of oil-cooled motor maintenance and further enhancing the maintenance efficiency of the motor. For example, when the drive component 20 inside the motor housing 11 needs maintenance, the corresponding part of the first end cover 151 in the motor housing 11 can be disassembled, so that the oil medium inside the oil collection tank 12 does not need to be drained, and the oil medium in the oil collection tank 12 can continue to be used for circulating cooling after the drive component 20 is maintained. The second end cover 152 can also be configured as a split structure, with the same configuration and installation method as the first end cover 151.

[0037] like Figure 1 As shown in the embodiment of the present application, the oil-cooled motor has a mounting shell 13 and an oil collecting shell 12 that are at least partially overlapped, and the outer surface of the mounting shell 13 is sealed to the oil collecting shell 12. The communication port 131 of the mounting shell 13 is located outside the oil collecting shell 12.

[0038] In specific implementation, the mounting shell 13 and the oil collecting shell 12 are at least partially overlapped, that is, at least part of the mounting shell 13 extends into the oil collecting shell 12. While ensuring that there is sufficient installation space inside the mounting shell 13 for installing the filter element 31 and the pump body 32, the common volume of the mounting shell 13 and the oil collecting shell 12 can be reduced, thereby reducing the overall space occupied by the oil-cooled motor and further improving the overall integration of the oil-cooled motor.

[0039] The outer surface of the mounting housing 13 is sealed to the oil collecting housing 12, preventing oil from leaking from the connection between the mounting housing 13 and the oil collecting housing 12. The connection port 131 of the mounting housing 13 is located outside the oil collecting housing 12, ensuring that the internal space of the mounting housing 13 can directly communicate with the external environment through the connection port 131. This allows operators to directly disassemble the filter element 31 or the pump body 32 at the connection port 131, ensuring the overall maintainability of the oil-cooled motor.

[0040] It should be noted that the part of the housing 13 inside the oil collecting shell 12 has a connecting hole. The connecting hole can connect the internal space of the housing 13 with the internal space of the oil collecting shell 12, so that part of the oil circuit assembly 40 passes through the connecting hole and transfers the oil medium in the oil collecting shell 12 to the filter element 31 in the housing 13 for filtration.

[0041] like Figure 2 As shown in the embodiment of the present application, the oil-cooled motor has a first mounting groove 132 and a second mounting groove 133 extending in the same direction inside the mounting housing 13, which are respectively used to install the filter element 31 and the pump body 32. The ends of the first mounting groove 132 and the second mounting groove 133 are connected. The communication port 131 of the mounting housing 13 is located at the end of the second mounting groove 133 away from the first mounting groove 132, and the cross-sectional area of ​​the first mounting groove 132 in its own extension direction is smaller than the cross-sectional area of ​​the second mounting groove 133 in its own extension direction.

[0042] In specific implementation, the first mounting groove 132 and the second mounting groove 133 extend in the same direction and are connected to each other. The filter element 31 is detachably installed in the bottom first mounting groove 132, and the pump body 32 is detachably installed in the second mounting groove 133. The ends of the first mounting groove 132 and the second mounting groove 133 are connected, so that the filter element 31 in the first mounting groove 132 can be directly connected to the pump body 32 in the second mounting groove 133 without the need for further connecting pipelines. This improves the overall integration of the oil-cooled motor, and the filter element 31 and the pump body 32 can also be easily disassembled, improving the maintainability of the oil-cooled motor.

[0043] Furthermore, in its extension direction, the cross-sectional area of ​​the first mounting groove 132 is smaller than that of the second mounting groove 133, so that a stepped structure can be formed between the first mounting groove 132 and the second mounting groove 133. This allows the pump body 32 to have a mounting foundation when installed in the second mounting groove 133, and the stepped structure can also prevent the axial movement of the pump body 32, ensuring the installation stability of the pump body 32 in the second mounting groove 133, and further improving the connection stability between the pump body 32 and the filter element 31.

[0044] like Figure 3As shown in the embodiment of this application, the oil-cooled motor includes an oil circuit assembly 40 comprising a circulating oil circuit pipe 41 and a cooling oil circuit pipe 42 connected to each other. The circulating oil circuit pipe 41 passes through the oil collection shell 12, the mounting shell 13 and the mounting part 14 in sequence, and is connected to the filter element 31, the pump body 32 and the cooling element 33 in sequence, so that the oil medium in the oil collection shell 12 is transferred to the cooling oil circuit pipe 42 after being filtered and cooled. The cooling oil circuit pipe 42 passes through the motor housing 11 and the end cover assembly 15 to cool the drive assembly 20 inside the motor housing 11 at different locations.

[0045] In practical implementation, the circulating oil pipeline 41 connects the internal space of the oil collecting shell 12, the filter element 31 in the mounting shell 13, and the pump body 32 with the cooling element 33 installed on the mounting part 14 to form a loop. The oil medium with high heat in the oil collecting shell 12 can reach the filter element 31 for filtration under the pumping of the pump body 32, and then reach the cooling element 33 for cooling after passing through the pump body 32, thereby reducing the temperature of the oil medium so that it can enter the cooling oil pipeline 42 to cool the drive assembly 20 in the motor housing 11. Furthermore, the cooling oil pipeline 42 also passes through the motor housing 11 and the end cover assembly 15, thereby cooling the drive assembly 20 at different locations to achieve comprehensive cooling of the drive assembly 20, improve the internal cooling effect of the oil-cooled motor, and ensure motor efficiency.

[0046] like Figure 4 As shown in the embodiment of this application, the oil-cooled motor has an oil leakage gap 16 between the end cover assembly 15 and the end face of the motor housing 11 and between the end face of the oil collection housing 12. The end of the cooling oil passage pipe 42 is connected to the beginning of the circulating oil passage pipe 41 through the oil leakage gap 16 to form an oil medium circulation loop of the circulating oil passage pipe 41, the cooling oil passage pipe 42 and the oil leakage gap 16.

[0047] In practice, the oil leakage gap 16 enables the connection between the cooling oil pipeline 42 and the circulating oil pipeline 41, eliminating the need for further pipeline structures to guide oil, thus simplifying the internal structure of the oil-cooled motor and reducing its complexity and installation difficulty.

[0048] Specifically, the oil collection shell 12 is located at the bottom of the motor housing 11. After the oil medium cools the drive component 20, it will flow along the oil leakage gap 16 to the oil collection shell 12 at the bottom under the action of gravity. In this process, no additional power is required to realize the transfer of the oil medium from the motor housing 11 to the oil collection shell 12, saving the energy required to drive the transfer of the oil medium and completing the overall circulation process of the oil medium.

[0049] like Figure 4 and Figure 5As shown in the embodiment of this application, the oil-cooled motor includes a drive assembly 20 comprising a stator structure 21 and a rotor structure 22. The cooling oil pipeline 42 includes a first oil guide pipe 421 and a second oil guide pipe 422. The first oil guide pipe 421 passes through the motor housing 11 and the end cover assembly 15 in sequence, and is used to guide the oil medium to the inner side of the rotor structure 22 and the stator structure 21. The second oil guide pipe 422 passes through the motor housing 11, and is used to guide the oil medium to the outer side of the stator structure 21.

[0050] In specific implementation, the first oil guide pipe 421 passes through the motor housing 11 and the end cover assembly 15, so that the oil medium, after passing through the first oil guide pipe 421, reaches the end position of the rotor structure 22 and flows from the end to the center position along the extension direction of the rotor structure 22, thereby cooling the inner surface of the rotor structure 22 and the stator structure 21. The second oil guide pipe 422 passes through the motor housing 11, and the oil medium, after passing through the second oil guide pipe 422, can directly reach the outer peripheral surface of the stator structure 21, cooling the outer surface of the stator structure 21. This achieves comprehensive cooling of the inner and outer surfaces of the rotor structure 22 and the stator structure 21, improves the cooling effect inside the motor, ensures the motor efficiency, and the effective cooling of the rotor structure 22 can reduce the risk of magnet demagnetization and ensure the continuous power of the motor.

[0051] Specifically, the stator structure 21 is an annular columnar structure, and the rotor structure 22 is rotatably disposed inside the stator structure 21. The rotational cooperation between the rotor structure 22 and the stator structure 21 enables the driving effect of the oil-cooled motor. The cylindrical motor housing 11 is adapted to the shape of the stator structure 21 and the rotor structure 22, ensuring the stable rotation of the rotor structure 22 within the motor housing 11.

[0052] like Figure 3 and Figure 4 As shown in the embodiment of this application, the oil-cooled motor, wherein the drive assembly 20 further includes a first bearing 23, the first bearing 23 being disposed on the outer peripheral surface of the rotor structure 22 and close to the first end cover 151, as shown in the figure. Figure 3 As shown by the blue arrow, the first oil guide pipe 421 includes a first connecting pipe 4211, a first drain pipe 4212, and a second drain pipe 4213. The first connecting pipe 4211 passes through the motor housing 11 and one end is connected to the cooling oil pipe 42. The first drain pipe 4212 and the second drain pipe 4213 are connected to the other end of the first connecting pipe 4211 and both pass through the first end cover 151. The first drain pipe 4212 extends from the first end cover 151 to the first bearing 23, and the second drain pipe 4213 extends from the first end cover 151 to the inside of the rotor structure 22.

[0053] In practical implementation, the oil medium cooled by the cooling component 33 can be diverted through the first connecting pipe 4211 to the first oil drain pipe 4212 and the second oil drain pipe 4213. The first oil drain pipe 4212 can transfer the oil medium to the first bearing 23 to cool it, thereby preventing the first bearing 23, which is in rotational contact with the rotor structure 22, from overheating and affecting mutual rotation. The second oil drain pipe 4213 can cool the inside of the rotor structure 22, thereby ensuring the overall cooling effect of the rotor structure 22. Therefore, the first oil guide pipe 421 can simultaneously cool the first bearing 23 near the first end cover 151 and the rotor structure 22, ensuring the cooling effect inside the motor and further improving the working efficiency of the motor.

[0054] Specifically, the rotor structure 22 is a hollow shaft structure. The end of the second oil drain pipe 4213 is connected to the inside of the rotor structure 22. The rotor structure 22 has an oil throwing hole 221 along its radial direction. After the oil medium is discharged into the rotor structure 22 through the second oil drain pipe 4213, the rotation of the rotor structure 22 can throw the internal oil medium out through the oil throwing hole 221 and inject it into the inside of the stator structure 21, thereby achieving cooling of the rotor structure 22 and the inside of the stator structure 21, and achieving the effect of cooling the inside of the drive assembly 20.

[0055] like Figure 3 and Figure 4 As shown in the embodiment of the oil-cooled motor of this application, the drive assembly 20 further includes a second bearing 24, which is disposed on the outer peripheral surface of the rotor structure 22 and close to the second end cover 152. Figure 3 As shown by the red arrow, the second oil guide pipe 422 includes a second connecting pipe 4221, a third oil drain pipe 4222, and a fourth oil drain pipe 4223. The second connecting pipe 4221 passes through the motor housing 11 and one end is connected to the cooling oil pipe 42. The third oil drain pipe 4222 and the fourth oil drain pipe 4223 are connected to the other end of the second connecting pipe 4221. The third oil drain pipe 4222 passes through the motor housing 11 and the second end cover 152 in sequence to guide the oil medium to the second bearing 24. The fourth oil drain pipe 4223 passes through the motor housing 11 and extends from the motor housing 11 to the outside of the stator structure 21 to guide the oil medium to the outside of the stator structure 21.

[0056] In practical implementation, the oil medium, after being cooled by the cooling component 33, can be diverted to the third oil drain pipe 4222 and the fourth oil drain pipe 4223 after passing through the second connecting pipe 4221. The third oil drain pipe 4222 allows the oil medium to pass through the motor housing 11 and the second end cover 152 until it reaches the position of the second bearing 24, cooling the second bearing 24 and thus preventing the second bearing 24, which is in rotational contact with the rotor structure 22, from overheating and affecting mutual rotation. The fourth oil drain pipe 4223 allows the oil medium to directly pass through the motor housing 11 to the outside of the stator structure 21, cooling the outside of the stator structure 21. With the cooperation of the first oil guide pipe 421 and the second oil guide pipe 422, the inner and outer sides of the stator structure 21 of the drive assembly 20, the rotor structure 22, the first bearing 23, and the second bearing 24 can all be cooled, thereby achieving an overall cooling effect for the drive assembly 20 and ensuring the working efficiency of the motor.

[0057] Specifically, such as Figure 5 As shown, the stator structure 21 includes a stator core 211 and a stator winding 212. The stator winding 212 is arranged inside the stator core 211. The stator core 211 includes a core body 213 and oil guide rings 214 connected to both sides of the core body 213. The oil guide rings 214 are all annular structures and have oil injection holes 215 that are arranged radially through them to drain the oil medium on the surface of the stator winding 212 to the outer peripheral surface of the stator winding 212.

[0058] After the fourth oil pipe 4223 guides the oil medium to the outer surface of the stator structure 21, since the stator core 211 is located on the outer side of the stator structure 21 as a whole, the oil medium reaches the outer surface of the stator core 211 and flows from the outer surface of the core body 213 in the middle of the stator core 211 to the oil guide ring 214. The oil spray hole 215 penetrating the oil guide ring 214 can guide the oil medium to the outer circumferential surface of the stator winding 212, cooling the outer circumferential surface of the stator winding 212, thereby achieving complete cooling of the outer surfaces of the stator core 211 and the stator winding 212. In addition, the two oil guide rings 214 on both sides of the core body 213 can cool the part of the stator winding 212 protruding from the core body 213 at both ends, so that the stator winding 212 has sufficient cooling area, thereby ensuring the cooling effect of the stator structure 21 as a whole.

[0059] like Figure 1 and Figure 3 As shown in the embodiment of this application, the oil-cooled motor has a circulating oil pipeline 41 including a third oil guide pipe 411 and a fourth oil guide pipe 412. The third oil guide pipe 411 extends from the inside of the oil collection shell 12 into the mounting shell 13 and is connected to the filter element 31 inside the mounting shell 13. One end of the fourth oil guide pipe 412 is connected to the pump body 32, and the other end is connected to the cooling element 33.

[0060] In practical implementation, the third oil guide pipe 411 guides the oil medium in the oil collecting shell 12 to the filter element 31 in the mounting shell 13, allowing the filter element 31 to filter impurities in the oil medium. After passing through the pump body 32, the filtered oil medium reaches the cooling element 33 for cooling under the guidance of the fourth oil guide pipe 412. Therefore, the arrangement of the third oil guide pipe 411 and the fourth oil guide pipe 412 in the circulating oil pipeline 41 enables the connection between the oil collecting shell 12 and the filter element 31, as well as the connection between the pump body 32 and the cooling element 33, thereby achieving the filtration and cooling of the oil medium, allowing the oil medium to be recycled without the need for continuous external oil supply, thus saving overall costs.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. An oil-cooled electric machine characterized by, include: The outer casing (10) includes a motor housing (11), an oil collection housing (12), a mounting housing (13), and a mounting part (14). The oil collection housing (12), the mounting housing (13), and the mounting part (14) are arranged sequentially on the outer periphery of the motor housing (11) in the circumferential direction. The mounting housing (13) has a communication port (131) that communicates with the outside. The drive assembly (20) is disposed inside the motor housing (11); The circulation assembly (30) includes a filter element (31), a pump body (32), and a cooling element (33). The filter element (31) and the pump body (32) are detachably installed in the mounting housing (13) through the communication port (131) and are used to filter the oil medium and provide power, respectively. The cooling element (33) is detachably installed in the mounting part (14) and is used to cool the oil medium. The oil circuit assembly (40) is sequentially installed in the motor housing (11), the oil collection housing (12), the mounting housing (13) and the mounting part (14) to form an oil medium circulation loop.

2. The oil-cooled electric machine of claim 1, wherein, Both the motor housing (11) and the oil collection shell (12) are cylindrical structures, and the extension directions of the motor housing (11) and the oil collection shell (12) are the same. The outer shell (10) also includes an end cap assembly (15), which includes a first end cap (151) and a second end cap (152). The first end cap (151) is detachably installed at one side opening of the motor housing (11) and the oil collection shell (12), and the second end cap (152) is detachably installed at the other side opening of the motor housing (11) and the oil collection shell (12).

3. The oil-cooled electric machine of claim 1, wherein, The mounting shell (13) overlaps the oil collecting shell (12) at least partially, and the outer surface of the mounting shell (13) is sealed to the oil collecting shell (12). The communication port (131) of the mounting shell (13) is located outside the oil collecting shell (12).

4. The oil-cooled electric machine of claim 3, wherein, The mounting housing (13) has a first mounting groove (132) and a second mounting groove (133) extending in the same direction, which are used to install the filter element (31) and the pump body (32) respectively. The ends of the first mounting groove (132) and the second mounting groove (133) are connected. The communication port (131) of the mounting housing (13) is located at the end of the second mounting groove (133) away from the first mounting groove (132). The cross-sectional area of ​​the first mounting groove (132) in its own extending direction is smaller than the cross-sectional area of ​​the second mounting groove (133) in its own extending direction.

5. The oil-cooled electric machine of claim 2, wherein, The oil circuit assembly (40) includes a circulating oil circuit pipe (41) and a cooling oil circuit pipe (42) connected to each other. The circulating oil circuit pipe (41) passes through the oil collection shell (12), the mounting shell (13) and the mounting part (14) in sequence, and is connected to the filter element (31), the pump body (32) and the cooling element (33) in sequence, so that the oil medium in the oil collection shell (12) is transferred to the cooling oil circuit pipe (42) after filtration and cooling. The cooling oil circuit pipe (42) passes through the motor housing (11) and the end cover assembly (15) to cool the drive assembly (20) inside the motor housing (11) at different locations.

6. The oil-cooled electric machine of claim 5, wherein, There are oil leakage gaps (16) between the end cap assembly (15) and the end face of the motor housing (11) and between the end face of the oil collection housing (12). The end of the cooling oil pipeline (42) is connected to the beginning of the circulating oil pipeline (41) through the oil leakage gap (16) to form an oil medium circulation loop of the circulating oil pipeline (41), the cooling oil pipeline (42) and the oil leakage gap (16).

7. The oil-cooled electric machine of claim 5, wherein, The drive assembly (20) includes a stator structure (21) and a rotor structure (22). The cooling oil pipeline (42) includes a first oil guide pipe (421) and a second oil guide pipe (422). The first oil guide pipe (421) passes through the motor housing (11) and the end cover assembly (15) in sequence, and is used to guide the oil medium to the inner side of the rotor structure (22) and the stator structure (21). The second oil guide pipe (422) passes through the motor housing (11) and is used to guide the oil medium to the outer side of the stator structure (21).

8. The oil-cooled electric machine of claim 7, wherein, The drive assembly (20) further includes a first bearing (23), which is disposed on the outer peripheral surface of the rotor structure (22) and close to the first end cover (151). The first oil guide pipe (421) includes a first connecting pipe (4211), a first drain pipe (4212), and a second drain pipe (4213). The first connecting pipe (4211) passes through the motor housing (11) and one end is connected to the cooling oil pipe (42). The first drain pipe (4212) and the second drain pipe (4213) are connected to the other end of the first connecting pipe (4211) and both pass through the first end cover (151). The first drain pipe (4212) extends from the first end cover (151) to the first bearing (23), and the second drain pipe (4213) extends from the first end cover (151) to the interior of the rotor structure (22).

9. The oil-cooled electric machine of claim 7, wherein, The drive assembly (20) further includes a second bearing (24), which is disposed on the outer peripheral surface of the rotor structure (22) and close to the second end cover (152). The second oil guide pipe (422) includes a second connecting pipe (4221), a third drain pipe (4222), and a fourth drain pipe (4223). The second connecting pipe (4221) passes through the motor housing (11) and one end is connected to the cooling oil passage pipe (42). The third drain pipe (4222)... 222) and the fourth oil drain pipe (4223) are connected to the other end of the second connecting pipe (4221). The third oil drain pipe (4222) passes through the motor housing (11) and the second end cover (152) in sequence, and is used to guide the oil medium to the second bearing (24). The fourth oil drain pipe (4223) passes through the motor housing (11) and extends from the motor housing (11) to the outside of the stator structure (21), and is used to guide the oil medium to the outside of the stator structure (21).

10. The oil-cooled electric machine of claim 5, wherein, The circulating oil pipeline (41) includes a third oil guide pipeline (411) and a fourth oil guide pipeline (412). The third oil guide pipeline (411) extends from the inside of the oil collection shell (12) into the mounting shell (13) and is connected to the filter element (31) inside the mounting shell (13). One end of the fourth oil guide pipeline (412) is connected to the pump body (32), and the other end is connected to the cooling element (33).

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