An electric machine and vehicle

Abstract

The application provides a motor and a vehicle, and relates to the technical field of vehicles, and the motor comprises a casing, a stator winding, a stator core, a first sealing ring and a second sealing ring, one end of the first sealing ring and the second sealing ring is respectively in sealing connection with the axial two ends of the stator core, the other end is respectively in sealing connection with the casing, the first sealing ring, the stator core and the casing surround a first oil cavity which is in communication with an oil inlet, the second sealing ring, the stator core and the casing surround a second oil cavity which is in communication with the oil inlet, and the axial two ends of the stator winding are respectively located in the first oil cavity and the second oil cavity; the casing is provided with a first oil passing channel which is in communication with the first oil cavity and a second oil passing channel which is in communication with the second oil cavity, and the first oil passing channel and the second oil passing channel are respectively in communication with an oil outlet. In this way, the stator winding can be soaked and cooled, and the cooling oil can be prevented from entering the rotor air gap to stir the oil, so that the cooling effect and efficiency of the motor are improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to an electric motor and a vehicle. Background Technology

[0002] Currently, when cooling motors, oil spraying is usually carried out using methods such as oil spray pipes, oil spray sealing rings, or in-slot cooling. However, the cooling effect is poor, and cooling oil is prone to leaking into the rotor air gap, resulting in oil churning losses and reducing motor efficiency. Summary of the Invention

[0003] The problem this invention addresses is how to improve the cooling effect and efficiency of an electric motor.

[0004] To address the above problems, the present invention provides an electric motor and a vehicle.

[0005] In a first aspect, the present invention provides an electric motor, including a housing having an oil inlet and an oil outlet, and a stator assembly, a first sealing ring and a second sealing ring disposed within the housing. The stator assembly includes a stator winding and a stator core having stator slots. The stator winding is disposed at the stator slots and extends out of the stator core along the axial direction. The first sealing ring and the second sealing ring are respectively disposed at both ends of the stator core along the axial direction. The first sealing ring and the second sealing ring are respectively sealed to the stator core and the housing at their axial ends. The first sealing ring, the first end face of the stator core and the housing form a closed first oil cavity, and the second sealing ring, the second end face of the stator core and the housing form a closed second oil cavity. The first oil cavity and the second oil cavity are respectively connected to the oil inlet. The axial ends of the stator winding are respectively located in the first oil cavity and the second oil cavity and are respectively immersed in the cooling oil in the first oil cavity and the second oil cavity. The first end face and the second end face of the stator core are respectively the end faces of the two axial ends of the stator core. The inner wall of the housing is provided with a first oil passage and a second oil passage. The first oil passage is located on the side of the first sealing ring away from the stator core and is connected to the first oil cavity. The second oil passage is located on the side of the second sealing ring away from the stator core and is connected to the second oil cavity. The first oil passage and the second oil passage are respectively connected to the oil outlet.

[0006] Optionally, the first sealing ring and the second sealing ring are respectively provided with a first oil passage hole and a second oil passage hole, the first oil cavity and the first oil passage channel are connected at the first oil passage hole, the second oil cavity and the second oil passage channel are connected at the second oil passage hole, and the first oil passage hole and the second oil passage hole are located above the stator winding.

[0007] Optionally, the stator core is provided with a first oil passage and a second oil passage. The first oil passage is an annular structure arranged around the central axis of the stator core and is disposed on the outer side wall of the stator core. The second oil passage penetrates the end faces of both ends of the stator core along the axial direction. The oil inlet, the first oil passage and the second oil passage are connected in sequence. The two ends of the second oil passage along the axial direction of the stator core are respectively connected to the first oil cavity and the second oil cavity.

[0008] Optionally, the stator core includes a first core segment, a second core segment, and a third core segment. The two first core segments form the two ends of the stator core along the axial direction and are arranged adjacent to the second core segment. The second core segment and the third core segment are located between the two first core segments and are arranged alternately along the axial direction. The first core segment and the second core segment have the same outer diameter, which is larger than the outer diameter of the third core segment. The outer circumferential surface of the third core segment and the second core segments at both ends of the third core segment form the first oil passage. The second oil passage passes through the first core segment and the second core segment along the axial direction of the stator core and passes through the first oil passage.

[0009] Optionally, the stator core further includes a cylindrical sealing skeleton. The stator slot has a groove on one side near the central axis of the stator core. The sealing skeleton is arranged inside the stator core along the axial direction of the stator core and seals the groove of the stator slot. The two ends of the sealing skeleton extend out of the stator core and are respectively sealed and connected to the first sealing ring and the second sealing ring.

[0010] Optionally, the sealing frame includes first sealing portions located at both axial ends and a plurality of second sealing portions located between the two first sealing portions and spaced circumferentially along the stator core. The second sealing portions are located in the corresponding stator slots on the second core segment and the third core segment, and seal the slot openings of the corresponding stator slots on the second core segment and the third core segment. The inner diameters of the second core segment and the third core segment are the same and smaller than the inner diameter of the first core segment. The inner circumferential surface of the first core segment and its adjacent second core segment form a receiving groove. The first sealing portions are located in the receiving groove and seal the slot openings of the corresponding stator slots on the first core segment.

[0011] Optionally, the first sealing ring includes a first ring body and a first sealing ring. The first sealing ring is sleeved on the first ring body and abuts against the inner wall of the housing in the radial direction of the housing. The end face of one end of the first ring body along its axial direction abuts against the housing. The other end of the first ring body along its axial direction is provided with one of a first annular groove and a first annular boss. The other end of the sealing skeleton along its axial direction is provided with the other of the first annular groove and the first annular boss. The first annular boss is inserted into the first annular groove. And / or, the second sealing ring includes a second ring body and a second sealing ring, the second sealing ring is sleeved on the second ring body and abuts against the inner wall of the housing in the radial direction of the housing, the end face of one end of the second ring body along its axial direction abuts against the housing, the other end of the second ring body along its axial direction is provided with one of a second annular groove and a second annular boss, the other end of the sealing skeleton along its axial direction is provided with the other of the second annular groove and the second annular boss, and the second annular boss is inserted into the second annular groove.

[0012] Optionally, the housing includes a first end cover, a housing, and a second end cover arranged sequentially along its axial direction. The first end cover and the second end cover are respectively provided with a first oil passage and a second oil passage at their ends facing the stator assembly. The housing is provided with an oil inlet, an oil outlet, and a third oil passage penetrating the end faces of both ends of the housing along its axial direction. The two ends of the third oil passage along the axial direction of the housing are respectively connected to the first oil passage and the second oil passage, and the oil outlet is connected to the middle part of the third oil passage.

[0013] Optionally, the oil inlet and the oil outlet are located at the bottom of the housing, and the oil outlet is located at the lowest point of the housing.

[0014] Secondly, the present invention provides a vehicle including the motor described above.

[0015] The beneficial effects of the motor of the present invention are as follows: By providing an oil inlet on the motor housing, and providing a first sealing ring and a second sealing ring at both axial ends of the stator core, the first sealing ring, the first end face of the stator core, and the housing form a first oil cavity that communicates with and is closed to the oil inlet. Similarly, the second sealing ring, the second end face of the stator core, and the housing form a second oil cavity that communicates with and is closed to the oil inlet. This allows external cooling oil to flow into and be stored in both the first and second oil cavities through the oil inlet. Simultaneously, the axial ends of the stator windings located in the stator slots of the stator core are respectively located within the first and second oil cavities. The cooling oil in the first and second oil cavities immerses and cools the ends of the stator windings extending outside the stator core, thereby efficiently and rapidly reducing the temperature of the stator windings and improving the cooling effect of the motor. Furthermore, the first and second sealing rings are sealed at one end along the axial direction of the stator core to both axial ends of the stator core, and at the other end to the housing, ensuring the sealing of the first and second oil cavities. Meanwhile, by setting an oil outlet on the housing and setting a first oil passage and a second oil passage on the inner wall of the housing, which are respectively connected to the oil outlet, and connecting the first oil passage and the second oil passage to the first oil chamber and the second oil chamber respectively, the cooling oil flowing into the first oil chamber and the second oil chamber can flow back to the oil outlet through the first oil passage and the second oil passage when it reaches the upper limit of storage. On the one hand, this can ensure that the cooling oil flows back in the first oil passage and the second oil passage, avoiding the cooling oil from entering the rotor air gap and causing oil turbulence, thereby improving the motor efficiency. On the other hand, it is convenient to transport the cooling oil back to the oil inlet for circulation cooling, thereby further improving the cooling effect of the motor. Furthermore, by setting the first oil passage on the side of the first sealing ring away from the stator core and the second oil passage on the side of the second sealing ring away from the stator core, it is convenient to set the oil passage in the housing, such as the end cover structure, to realize oil return, thereby reducing the axial dimension of the housing and even the motor, and thus facilitating its arrangement on the vehicle. On the other hand, it can increase the contact area between the cooling oil and the housing, making it easier for the cooling oil to absorb the heat transferred from the stator assembly to the housing during the return flow, thereby further improving the cooling effect of the motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the exploded structure of the motor in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the motor at the oil inlet in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the motor at the oil outlet in an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 for Figure 3A magnified view of a section at point B in the middle; Figure 6 This is a cross-sectional schematic diagram of the stator core in an embodiment of the present invention; Figure 7 This is a schematic diagram of the stator core structure in an embodiment of the present invention; Figure 8 This is a schematic diagram of the sealing skeleton in an embodiment of the present invention; Figure 9 This is a partial structural diagram of the stator core at the receiving slot in an embodiment of the present invention; Figure 10 This is a partial cross-sectional view of the first sealing ring in an embodiment of the present invention; Figure 11 This is a partial cross-sectional schematic diagram of the second sealing ring in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Housing; 11. First end cover; 12. Housing; 13. Second end cover; 14. Oil inlet; 15. Oil outlet; 16. First oil passage; 17. Second oil passage; 18. Third oil passage; 2. Stator assembly; 21. Stator winding; 22. Stator core; 221. First core section; 222. Second core section; 223. Third core section; 224. Sealing frame; 2241. First sealing part; 2242. Second sealing part; 2 25. Stator slot; 226. Receiving groove; 231. First oil passage; 232. Second oil passage; 3. First sealing ring; 31. First oil passage hole; 32. First ring body; 33. First sealing ring; 4. Second sealing ring; 41. Second oil passage hole; 42. Second ring body; 43. Second sealing ring; 5. First oil cavity; 6. Second oil cavity; 71. First annular groove; 72. First annular boss; 73. Second annular groove; 74. Second annular boss. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0020] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] In related technologies, when cooling the motor, oil spraying is usually carried out by means of oil spraying pipe, oil spraying sealing ring or in-slot cooling, but the cooling effect is poor and the cooling oil is prone to leaking into the rotor air gap, resulting in oil churning loss and reducing motor efficiency.

[0022] To address the problems existing in the aforementioned related technologies, the present invention provides an electric motor and a vehicle.

[0023] Combination Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides an electric motor, including a housing 1 with an oil inlet 14 and an oil outlet 15, and a stator assembly 2, a first sealing ring 3 and a second sealing ring 4 disposed within the housing 1. The stator assembly 2 includes a stator winding 21 and a stator core 22 with stator slots 225. The stator winding 21 is disposed at the stator slots 225 and extends out of the stator core 22 along the axial direction. The first sealing ring 3 and the second sealing ring 4 are respectively disposed at both ends of the axial direction of the stator core 22. Both ends of the first sealing ring 3 and the second sealing ring 4 along the axial direction are respectively sealed to the stator core 22 and the housing 1. The first sealing ring 3, the first end face of the stator core 22 and the housing 1 form a closed first oil cavity 5. The second sealing ring 4, the second end face of the stator core 22 and the housing 1 form a closed second oil cavity 6. The first oil cavity 5 and the second oil cavity 6 are respectively connected to the oil inlet 14. The two ends of the stator winding 21 along the axial direction are respectively located in the first oil cavity 5 and the second oil cavity 6 and are respectively immersed in the cooling oil in the first oil cavity 5 and the second oil cavity 6. The first end face and the second end face of the stator core 22 are the end faces of the two ends of the stator core 22 along the axial direction. The inner wall of the housing 1 is provided with a first oil passage 16 and a second oil passage 17. The first oil passage 16 is located on the side of the first sealing ring 3 away from the stator core 22 and is connected to the first oil cavity 5. The second oil passage 17 is located on the side of the second sealing ring 4 away from the stator core 22 and is connected to the second oil cavity 6. The first oil passage 16 and the second oil passage 17 are respectively connected to the oil outlet 15.

[0024] Specifically, the shape of the housing 1 is usually adapted to the shape of the stator assembly 2. Since the stator assembly 2 is a hollow cylindrical structure, the housing 1 is also a hollow cylindrical structure. Moreover, the stator assembly 2 can be fixed inside the housing 1 using a heat-fitting process to ensure the firmness of the stator assembly 2 within the housing 1. The stator assembly 2 includes a stator winding 21 and a stator core 22. The stator core 22 has multiple stator slots 225 evenly distributed along its circumference. The stator winding 21 is disposed within the stator slots 225 and extends axially outward from the stator core 22. The first sealing ring 3 and the second sealing ring 4 are generally sleeve-shaped structures and are respectively disposed at the two ends of the stator core 22. The first sealing ring 3, the first end face of the stator core 22 and the housing 1 form a closed first oil cavity 5, and the second sealing ring 4, the second end face of the stator core 22 and the housing 1 form a closed second oil cavity 6. The two ends of the stator winding 21 are respectively located in the first oil cavity 5 and the second oil cavity 6, so that the two ends of the stator winding 21 can be immersed in the cooling oil in the first oil cavity 5 and the second oil cavity 6. At the same time, one end of the first sealing ring 3 is sealed to the first end of the stator core 22 and the other end of the first sealing ring 3 is sealed to the housing 1. One end of the second sealing ring 4 is sealed to the second end of the stator core 22 and the other end of the second sealing ring 4 is sealed to the housing 1, so that the first oil cavity 5 and the second oil cavity 6 are sealed cavities, wherein the first end and the second end of the stator core 22 are the two ends of the stator core 22.

[0025] More specifically, the housing 1 is provided with an oil inlet 14, which penetrates the housing wall of the housing 1. The first oil chamber 5 and the second oil chamber 6 are respectively connected to the oil inlet 14, so that the cooling oil outside the motor can flow into the first oil chamber 5 and the second oil chamber 6 through the oil inlet 14 to immerse and cool the axial ends of the stator winding 21. Figure 2The red arrows indicate the oil inlet paths. For example, an oil inlet 14 can be provided on the housing 1 at positions corresponding to the first oil chamber 5 and the second oil chamber 6, connecting the first oil chamber 5 and the second oil chamber 6 to these two oil inlets 14 respectively; alternatively, an oil inlet 14 and an oil inlet channel connected to the oil inlet 14 can be provided on the housing 1, connecting the first oil chamber 5 and the second oil chamber 6 to the oil inlet channel respectively, allowing external cooling oil to flow into the first oil chamber 5 and the second oil chamber 6 through the oil inlet 14 and the oil inlet channel; alternatively, a cooling channel (i.e., the first oil passage 231 and the second oil passage 232 mentioned later) connected to the oil inlet 14 can be provided on the stator core 22, using the cooling channel to connect the first oil chamber 5 and the second oil chamber 6 to the oil inlet 14 respectively. No specific limitations are made here; the design can be selected according to needs in practical applications. Furthermore, the housing 1 is also provided with an oil outlet 15, a first oil passage 16, and a second oil passage 17. The oil outlet 15 penetrates the housing wall of the housing 1. The first oil passage 16 and the second oil passage 17 are located on the inner wall of the housing 1 and are respectively connected to the oil outlet 15. Simultaneously, the first oil passage 16 is located on the side of the first sealing ring 3 away from the stator core 22 and is connected to the first oil cavity 5. The second oil passage 17 is located on the side of the second sealing ring 4 away from the stator core 22 and is connected to the second oil cavity 6. The oil passage can be connected to the corresponding oil cavity by opening an oil passage hole on the sealing ring, or by setting a connecting channel on the inner wall of the housing 1. No specific limitation is made here. Thus, as... Figure 2 and Figure 3 The green arrow in the middle indicates the oil outlet path, which allows the cooling oil flowing into the first oil chamber 5 and the second oil chamber 6 to return to the oil outlet 15 via the first oil passage 16 and the second oil passage 17 respectively when the storage limit is reached.

[0026] In this embodiment, an oil inlet 14 is provided on the motor housing 1, and a first sealing ring 3 and a second sealing ring 4 are respectively provided at both axial ends of the stator core 22. The first sealing ring 3, the first end face of the stator core 22, and the housing 1 form a first oil cavity 5 that is connected to and closed by the oil inlet 14. The second sealing ring 4, the second end face of the stator core 22, and the housing 1 form a second oil cavity 6 that is connected to and closed by the oil inlet 14. This allows cooling oil from outside the motor to flow into the first oil cavity 5 and the second oil cavity 6 for storage. At the same time, the two axial ends of the stator winding 21, which is located at the stator slot 225 of the stator core 22, are respectively located in the first oil cavity 5 and the second oil cavity 6. The cooling oil in the first oil cavity 5 and the second oil cavity 6 is used to immerse and cool the two ends of the stator winding 21 that extend outside the stator core 22, thereby efficiently and quickly reducing the temperature of the stator winding 21 and improving the cooling effect of the motor. In addition, one end of the first sealing ring 3 and the second sealing ring 4 along the axial direction of the stator core 22 are respectively sealed to both ends of the stator core 22, and the other end is respectively sealed to the housing 1 to ensure the sealing of the first oil chamber 5 and the second oil chamber 6. At the same time, by setting an oil outlet 15 on the housing 1, and setting a first oil passage 16 and a second oil passage 17 on the inner wall of the housing 1 respectively connected to the oil outlet 15, and connecting the first oil passage 16 and the second oil passage 17 to the first oil chamber 5 and the second oil chamber 6 respectively, the cooling oil flowing into the first oil chamber 5 and the second oil chamber 6 can flow back to the oil outlet 15 through the first oil passage 16 and the second oil passage 17 respectively when the storage limit is reached. On the one hand, this can ensure that the cooling oil flows back in the first oil passage 16 and the second oil passage 17, avoiding the cooling oil from entering the rotor air gap and causing oil turbulence, thereby improving the motor efficiency. On the other hand, it is convenient to transport the cooling oil back to the oil inlet 14 for circulation cooling, thereby further improving the cooling effect of the motor. Furthermore, by setting the first oil passage 16 on the side of the first sealing ring 3 away from the stator core 22 and setting the second oil passage 17 on the side of the second sealing ring 4 away from the stator core 22, it is convenient to set the oil passage on the end cover structure of the housing 1 to realize oil return, thereby reducing the axial dimension of the housing 1 and even the motor, and thus facilitating its arrangement on the vehicle. On the other hand, it can increase the contact area between the cooling oil and the housing 1, making it easier for the cooling oil to absorb the heat transferred from the stator assembly 2 to the housing 1 during the return process, thereby further improving the cooling effect of the motor.

[0027] Furthermore, the first oil passage 16 and the second oil passage 17 can be arranged circumferentially along the housing 1. That is, the first oil passage 16 and the second oil passage 17 form an annular channel structure. This can further increase the contact area between the cooling oil and the housing 1, making it easier for the cooling oil to absorb the heat transferred from the stator assembly 2 to the housing 1 during the return flow process, thereby further improving the cooling effect of the motor.

[0028] Optionally, combined Figure 2 , Figure 3 , Figure 10 and Figure 11 As shown, the first sealing ring 3 and the second sealing ring 4 are respectively provided with a first oil passage hole 31 and a second oil passage hole 41. The first oil cavity 5 is connected to the first oil passage channel 16 at the first oil passage hole 31, and the second oil cavity 6 is connected to the second oil passage channel 17 at the second oil passage hole 41. The first oil passage hole 31 and the second oil passage hole 41 are located above the stator winding 21.

[0029] Specifically, the first ring body 32 of the first sealing ring 3 (described later) and the second ring body 42 of the second sealing ring 4 (described later) both include a cylindrical portion and a disc portion with a central hole. The disc portion is sleeved outside the cylindrical portion and located at one end of the cylindrical portion to form the end face of one end of the sealing ring. The first oil passage hole 31 is provided on the disc portion of the first ring body 32 and is located above the stator winding 21. The second oil passage hole 41 is provided on the disc portion of the second ring body 42 and is located above the stator winding 21.

[0030] Compared to connecting the oil passage to the corresponding oil cavity by setting a connecting channel on the inner wall of the housing 1, connecting the oil cavity to the corresponding oil passage by opening an oil passage hole on the sealing ring not only facilitates production but also simplifies the structure of the housing 1, thereby simplifying the production mold of the housing 1 and reducing production costs. In addition, by placing the first oil passage hole 31 and the second oil passage hole 41 above the stator winding 21, it is possible to prevent the cooling oil from flowing out of the first oil passage hole 31 or the second oil passage hole 41 when the cooling oil level is low. This ensures that the cooling oil stored in the oil cavity can completely immerse both axial ends of the stator winding 21, thereby improving the immersion cooling effect.

[0031] Optionally, combined Figure 2 and Figure 6 As shown, the stator core 22 is provided with a first oil passage 231 and a second oil passage 232. The first oil passage 231 is a ring structure arranged around the central axis of the stator core 22 and is arranged on the outer side wall of the stator core 22. The second oil passage 232 passes through the end faces of both ends of the stator core 22 along the axial direction. The oil inlet 14, the first oil passage 231 and the second oil passage 232 are connected in sequence. The two ends of the second oil passage 232 along the axial direction of the stator core 22 are respectively connected to the first oil cavity 5 and the second oil cavity 6.

[0032] Specifically, the first oil passage 231 penetrates the outer wall of the stator core 22, and the second oil passage 232 penetrates the end faces of both ends of the stator core 22 along its axial direction. The first oil passage 231 can be a circular passage arranged circumferentially around the stator core 22, or an elliptical passage arranged around the central axis of the stator core 22. The second oil passage 232 can be arranged axially along the stator core 22, or inclined relative to the axial direction of the stator core 22; no specific limitation is made here. Furthermore, multiple second oil passages 232 can be provided. In this case, the multiple second oil passages 232 are evenly distributed circumferentially around the stator core 22 and are respectively connected to the first oil passage 231.

[0033] In this optional embodiment, a first oil passage 231 communicating with the oil inlet 14 can be provided on the outer wall of the stator core 22, so that the cooling oil outside the motor can flow into the stator core 22 through the oil inlet 14 and the first oil passage 231 to cool the stator core 22. At the same time, a second oil passage 232 communicating with the first oil passage 231 can be provided in the stator core 22, and the second oil passage 232 can penetrate the end faces of both ends of the stator core 22 in the axial direction, so that the cooling oil flowing into the stator core 22 can flow out from both ends of the stator core 22 in the axial direction and then flow into the first oil cavity 5 and the second oil cavity 6, so as to soak and cool both ends of the stator winding 21. Furthermore, by setting the first oil passage 231 as a ring structure arranged around the central axis of the stator core 22, on the one hand, the difficulty of aligning the oil inlet 14 with the first oil passage 231 during assembly can be reduced, improving the convenience of assembly. On the other hand, when the stator core 22 is provided with multiple second oil passages 232 distributed circumferentially, the cooling oil flowing from the oil inlet 14 into the first oil passage 231 can form multiple cooling oil paths distributed circumferentially on the stator core 22. These cooling oil paths flow to the first oil cavity 5 and the second oil cavity 6 at both ends of the axial direction of the stator core 22, that is, forming a ring of cooling oil paths that diffuse towards both sides of the winding on the stator core 22. This can increase the flow rate of cooling oil to the first oil cavity 5 and the second oil cavity 6, thereby increasing the diffusion speed of the cooling oil in the first oil cavity 5 and the second oil cavity 6. Moreover, the arrangement of multiple second oil passages 232 can also increase the cooling area of ​​the stator core 22 and improve the cooling effect.

[0034] Optionally, combined Figure 6 and Figure 7 As shown, the stator core 22 includes a first core segment 221, a second core segment 222 and a third core segment 223. The two first core segments 221 respectively form the two ends of the stator core 22 in the axial direction and are arranged adjacent to the second core segment 222. The second core segment 222 and the third core segment 223 are located between the two first core segments 221 and are arranged alternately in the axial direction. The outer diameters of the first core segment 221 and the second core segment 222 are the same and larger than the outer diameter of the third core segment 223. The outer circumferential surface of the third core segment 223 and the second core segments 222 at both ends form the first oil passage 231. The second oil passage 232 passes through the first core segment 221 and the second core segment 222 along the axial direction of the stator core 22 and passes through the first oil passage 231.

[0035] In this optional embodiment, there are two first core segments 221, which respectively form the two ends of the stator core 22 axially. There are at least two second core segments 222 and at least one third core segment 223. Moreover, each first core segment 221 is arranged adjacent to a second core segment 222, and each third core segment 223 has a second core segment 222 at each of its two axial ends. By setting the outer diameters of the first core segment 221 and the second core segment 222 to be the same and larger than the outer diameter of the third core segment 223, the second core segment 222 extends radially beyond the third core segment 223. This allows the outer circumferential surface of the third core segment 223 and the side surfaces of the second core segment 222 extending beyond the third core segment 223 at both ends of its axial direction to jointly form an annular groove, which is the first oil passage 231. This achieves the design of the first oil passage 231. The second oil passage 232 is designed by passing through the first core segment 221 and the second core segment 222 along the axial direction of the stator core 22 and through the annular groove. Furthermore, the second oil passage 232 can be located on the side of the third core segment 223 away from the central axis of the stator core 22 to ensure that the second oil passage 232 can communicate with the first oil passage 231. In addition, by designing the stator core 22 as a segmented structure, it is convenient to process the first oil passage 231 and the second oil passage 232, and it is also convenient to inject a sealing skeleton 224 (described later) into the stator core 22 to axially seal the inner slot of the stator slot 225, so as to prevent the cooling oil from seeping into the rotor air gap from the end face of the stator core 22 and causing oil turbulence.

[0036] Optionally, combined Figure 3 , Figure 4 and Figure 7 As shown, the stator core 22 also includes a cylindrical sealing frame 224. The stator slot 225 has a slot on one side near the central axis of the stator core 22. The sealing frame 224 is arranged inside the stator core 22 along the axial direction of the stator core 22 and seals the slot of the stator slot 225. Both ends of the sealing frame 224 extend out of the stator core 22 and are respectively sealed and connected to the first sealing ring 3 and the second sealing ring 4.

[0037] In this optional embodiment, the sealing skeleton 224 can be an injection molded part and assembled onto the stator core 22 by injection molding. By setting the sealing skeleton 224 along the axial direction of the stator core 22 inside the stator core 22, for example, in the stator slot 225, and sealing the slot opening of the stator slot 225 on the side near the central axis of the stator core 22 (i.e., the inner slot opening of the stator slot 225, hereinafter referred to as the slot opening of the stator slot 225), the sealing skeleton 224 is used to axially seal the inner slot opening of the stator slot 225, preventing the cooling oil from seeping from the end face of the stator core 22 into the rotor air gap and causing oil turbulence, thereby improving the motor efficiency. At the same time, by extending the axial ends of the sealing skeleton 224 to the outside of the stator core 22 and sealingly connecting it with the first sealing ring 3 and the second sealing ring 4 respectively, the first oil cavity 5 and the second oil cavity 6 are sealed, thereby improving the immersion cooling effect of the stator winding 21.

[0038] Optionally, combined Figure 6 , Figure 7 and Figure 8 As shown, the sealing frame 224 includes a first sealing part 2241 located at both ends of the axial direction and a plurality of second sealing parts 2242 located between the two first sealing parts 2241 and spaced apart along the circumference of the stator core 22. The second sealing parts 2242 are located in the corresponding stator slots 225 on the second core segment 222 and the third core segment 223, and seal the slot openings of the corresponding stator slots 225 on the second core segment 222 and the third core segment 223. The inner diameters of the second core segment 222 and the third core segment 223 are the same and smaller than the inner diameter of the first core segment 221. The inner circumferential surface of the first core segment 221 and its adjacent second core segment 222 form a receiving groove 226. The first sealing part 2241 is located in the receiving groove 226 and seals the slot openings of the corresponding stator slots 225 on the first core segment 221.

[0039] In this optional embodiment, the number of second sealing portions 2242 is the same as the number of stator slots 225, and they correspond one-to-one. Multiple second sealing portions 2242 are connected into an integral structure via first sealing portions 2241. Furthermore, the second sealing portions 2242 are inserted into the corresponding stator slots 225 on the second core segment 222 and the third core segment 223, and seal the openings of the corresponding stator slots 225 on the second core segment 222 and the third core segment 223. In this way, the sealing frame 224 seals the openings of the stator slots 225 on the second core segment 222 and the third core segment 223. The second sealing part 2242 has a first sealing part 2241 at each of its axial ends. The two first iron core segments 221 with smaller inner diameters and their adjacent second iron core segments 222 with larger inner diameters respectively form receiving grooves 226. That is, the stator iron core 22 has a receiving groove 226 at each of its axial ends, and the two first sealing parts 2241 are respectively set in the two receiving grooves 226 and seal the slot openings of the corresponding stator slots 225 on the first iron core segments 221. In this way, while sealing the opening of the stator slot 225 on the first iron core section 221, the sealing frame 224 can also use the receiving groove 226 formed by the first iron core section 221 and the second iron core section 222 to axially limit the first sealing part 2241 of the sealing frame 224, ensuring the firmness of the sealing frame 224 fixed on the stator iron core 22. Moreover, the sealing frame 224 can axially seal the inner opening of the stator slot 225, preventing the cooling oil from seeping from the end face of the stator iron core 22 into the rotor air gap and causing oil turbulence, thereby further improving the motor efficiency.

[0040] Optionally, combined Figure 3 and Figure 10 As shown, the first sealing ring 3 includes a first ring body 32 and a first sealing ring 33. The first sealing ring 33 is sleeved on the outside of the first ring body 32, and the first sealing ring 33 abuts against the inner wall surface of the housing 1 in the radial direction of the housing 1. The end face of one end of the first ring body 32 along its axial direction abuts against the housing 1. The other end of the first ring body 32 along its axial direction is provided with one of the first annular groove 71 and the first annular boss 72. The other end of the sealing skeleton 224 along its axial direction is provided with the other of the first annular groove 71 and the first annular boss 72. The first annular boss 72 is inserted into the first annular groove 71.

[0041] In this optional embodiment, the first ring body 32 of the first sealing ring 3 includes a cylindrical portion and a disc portion with a central hole. The disc portion is sleeved outside the cylindrical portion and located at one end of the cylindrical portion to form the end face of one end of the sealing ring. The disc portion of the first ring body 32 is perpendicular to the central axis of the stator core 22 and abuts against the inner wall of the housing 1 in the axial direction. The cylindrical portion of the first ring body 32 away from the disc portion is provided with one of the first annular groove 71 and the first annular boss 72. The sealing frame 224 is provided with the other of the first annular groove 71 and the first annular boss 72 at the end near the first sealing ring 3. The first ring body 32 and the sealing frame 224 are axially connected by the insertion and engagement of the first annular groove 71 and the first annular boss 72. Thus, after assembly, the first sealing ring 3 is clamped between the housing 1 and the stator core 22 to achieve axial sealing of the first sealing ring 3. The first sealing ring 33 can be an O-ring, which is fitted onto the disc portion of the first ring body 32 and abuts against the inner wall of the housing 1 in the radial direction, thereby achieving radial sealing of the first sealing ring 3. In this way, the first sealing ring 3 can seal the first oil cavity 5 in both the axial and radial directions, ensuring that the first oil cavity 5 is a fully sealed oil cavity, thereby improving the sealing effect of the first oil cavity 5.

[0042] Optionally, combined Figure 3 , Figure 5 and Figure 11 As shown, the second sealing ring 4 includes a second ring body 42 and a second sealing ring 43. The second sealing ring 43 is sleeved on the outside of the second ring body 42, and the second sealing ring 43 abuts against the inner wall surface of the housing 1 in the radial direction of the housing 1. The end face of one end of the second ring body 42 along its axial direction abuts against the housing 1. The other end of the second ring body 42 along its axial direction is provided with one of the second annular groove 73 and the second annular boss 74. The other end of the sealing skeleton 224 along its axial direction is provided with the other of the second annular groove 73 and the second annular boss 74. The second annular boss 74 is inserted into the second annular groove 73.

[0043] In this optional embodiment, the second ring body 42 of the second sealing ring 4 also includes a cylindrical portion and a disc portion with a central hole. The disc portion is sleeved outside the cylindrical portion and located at one end of the cylindrical portion to form the end face of one end of the sealing ring. The disc portion of the second ring body 42 is perpendicular to the central axis of the stator core 22 and abuts against the inner wall of the housing 1 in the axial direction. The cylindrical portion of the second ring body 42 away from the disc portion is provided with one of the second annular groove 73 and the second annular boss 74. The sealing frame 224 is provided with the other of the second annular groove 73 and the second annular boss 74 at the end near the second sealing ring 4. The second ring body 42 and the sealing frame 224 are axially connected by the insertion and engagement of the second annular groove 73 and the second annular boss 74. Thus, after assembly, the second sealing ring 4 is clamped between the housing 1 and the stator core 22 to achieve axial sealing of the second sealing ring 4. The second sealing ring 43 can also be an O-ring, which is fitted onto the disc portion of the second ring body 42 and abuts against the inner wall of the housing 1 in the radial direction, thereby achieving radial sealing of the second sealing ring 4. In this way, the second sealing ring 4 can seal the second oil cavity 6 in both the axial and radial directions, ensuring that the second oil cavity 6 is a fully sealed oil cavity, thereby improving the sealing effect of the second oil cavity 6.

[0044] Optionally, combined Figure 1 As shown, the oil inlet 14 and oil outlet 15 are located at the bottom of the housing 1, with the oil outlet at the lowest point of the housing 1. By placing the oil inlet 14 at the bottom of the housing 1, cooling oil enters the stator core 22 from the bottom of the housing 1 and flows through the first oil passage 231 and the second oil passage 232 on the stator core 22 to the first oil chamber 5 and the second oil chamber 6. This allows the cooling oil in the oil chambers to spread upwards, ensuring that the cooling oil fully fills the oil chambers and thus fully immerses both axial ends of the stator winding 21, improving the cooling effect. Furthermore, since the cooling oil flows out of the oil chambers from the oil passages located above the stator winding 21 (i.e., the first oil passage 31 and the second oil passage 41), a circulation path of oil entering from a low point and exiting from a high point is formed, allowing for better circulation of the cooling oil. Furthermore, by setting the oil outlet at the lowest point of the housing 1, all the cooling oil flowing out of the oil chamber can flow back to the oil outlet 15 for circulation, so as to avoid the formation of a dead oil area, that is, to avoid the formation of a cooling oil area that cannot flow back to the oil outlet 15, thereby improving the circulation rate of the cooling oil.

[0045] Furthermore, combined Figure 2 and Figure 3 As shown, the oil inlet 14 and the oil outlet 15 are respectively arranged radially along the housing 1, which not only facilitates processing, but also facilitates rapid oil intake and output.

[0046] Optionally, combined Figure 1 and Figure 3As shown, the housing 1 includes a first end cover 11, a housing 12, and a second end cover 13 arranged sequentially along its axial direction. The first end cover 11 and the second end cover 13 are respectively provided with a first oil passage 16 and a second oil passage 17 at their ends facing the stator assembly 2. The housing 12 is provided with an oil inlet 14, an oil outlet 15, and a third oil passage 18 that passes through the end faces of both ends of the housing 12 along its axial direction. The two ends of the third oil passage 18 along the axial direction of the housing 12 are respectively connected to the first oil passage 16 and the second oil passage 17. The oil outlet 15 is connected to the middle part of the third oil passage 18.

[0047] In this optional embodiment, the housing 1 has a split structure, which not only allows for segmented production, simplifies production molds, reduces production difficulty, but also facilitates assembly. Specifically, the housing 1 is divided into three parts: a first end cover 11, a housing 12, and a second end cover 13. During assembly, the stator assembly 2 can be heat-fitted into the housing 12 first, then the first sealing ring 3 and the second sealing ring 4 can be installed at the axial ends of the stator core 22 respectively, and then the first end cover 11 and the second end cover 13 can be fixed to the axial ends of the housing 12 respectively using, for example, stop-positioning bolts, thereby completing the assembly. The first oil passage 16 is provided on the side of the first end cover 11 facing the stator assembly 2, the second oil passage 17 is provided on the side of the second end cover 13 facing the stator assembly 2, and the third oil passage 18 is provided in the wall of the housing 12 and penetrates the end faces of the axial ends of the housing 12. The third oil passage 18 can be provided along the axial direction of the housing 12 or inclined relative to the axial direction of the housing 12. Furthermore, the first oil passage 16 and the second oil passage 17 are respectively connected to the two ends of the third oil passage 18 along the axial direction of the housing 12, and the oil outlet 15 is connected to the middle part of the third oil passage 18. This allows the first oil passage 16 and the second oil passage 17 to be connected to the oil outlet 15 through the third oil passage 18. On the one hand, it eliminates the need to set multiple oil outlets 15 to discharge cooling oil, thereby simplifying the external structure of the housing 1. On the other hand, it can further increase the contact area between the cooling oil and the housing 1, making it easier for the cooling oil to absorb the heat transferred from the stator assembly 2 to the housing 1 during the return flow process, thereby further improving the cooling effect of the motor.

[0048] An embodiment of the present invention provides a vehicle including the motor described above.

[0049] The beneficial effects of the vehicle in this embodiment are the same as those of the motor described above, and will not be repeated here.

[0050] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An electric machine characterized in that, The device includes a housing (1) with an oil inlet (14) and an oil outlet (15), and a stator assembly (2), a first sealing ring (3), and a second sealing ring (4) disposed within the housing (1). The stator assembly (2) includes a stator winding (21) and a stator core (22) with stator slots (225). The stator winding (21) is disposed at the stator slots (225) and extends out of the stator core (22) along the axial direction. The first sealing ring (3) and the second sealing ring (4) are respectively disposed at both ends of the axial direction of the stator core (22). The first sealing ring (3) and the second sealing ring (4) are respectively sealed to the stator core (22) and the housing (1) at both ends along the axial direction. The first sealing ring (3), the first end face of the stator core (22) and the housing (1) form a closed first oil cavity (5). The second sealing ring (4), the second end face of the stator core (22) and the housing (1) form a closed second oil cavity (6). The first oil cavity (5) and the second oil cavity (6) are respectively connected to the oil inlet (14). The two ends of the stator winding (21) are respectively located in the first oil cavity (5) and the second oil cavity (6) and are respectively immersed in the cooling oil in the first oil cavity (5) and the second oil cavity (6). The first end face and the second end face of the stator core (22) are respectively the end faces of the two ends of the stator core (22) along the axial direction. The inner wall of the housing (1) is provided with a first oil passage (16) and a second oil passage (17). The first oil passage (16) is located on the side of the first sealing ring (3) away from the stator core (22) and is connected to the first oil cavity (5). The second oil passage (17) is located on the side of the second sealing ring (4) away from the stator core (22) and is connected to the second oil cavity (6). The first oil passage (16) and the second oil passage (17) are respectively connected to the oil outlet (15). The first sealing ring (3) and the second sealing ring (4) are respectively provided with a first oil passage hole (31) and a second oil passage hole (41). The first oil cavity (5) and the first oil passage channel (16) are connected at the first oil passage hole (31). The second oil cavity (6) and the second oil passage channel (17) are connected at the second oil passage hole (41). The first oil passage hole (31) and the second oil passage hole (41) are located above the stator winding (21).

2. The electric machine of claim 1, wherein, The stator core (22) is provided with a first oil passage (231) and a second oil passage (232). The first oil passage (231) is a ring structure arranged around the central axis of the stator core (22) and is arranged on the outer side wall of the stator core (22). The second oil passage (232) passes through the end faces of both ends of the stator core (22) along the axial direction. The oil inlet (14), the first oil passage (231) and the second oil passage (232) are connected in sequence. The two ends of the second oil passage (232) along the axial direction of the stator core (22) are respectively connected to the first oil cavity (5) and the second oil cavity (6).

3. The electric machine of claim 2, wherein, The stator core (22) includes a first core segment (221), a second core segment (222), and a third core segment (223). The two first core segments (221) respectively constitute the two ends of the stator core (22) along the axial direction and are arranged adjacent to the second core segment (222). The second core segment (222) and the third core segment (223) are located between the two first core segments (221) and are arranged alternately along the axial direction. The outer diameters of the first core segment (221) and the second core segment (222) are the same and larger than the outer diameter of the third core segment (223). The outer circumferential surface of the third core segment (223) and the second core segments (222) at both ends form the first oil passage (231). The second oil passage (232) passes through the first core segment (221) and the second core segment (222) along the axial direction of the stator core (22) and passes through the first oil passage (231).

4. The motor according to claim 3, characterized in that, The stator core (22) also includes a cylindrical sealing frame (224). The stator slot (225) has a slot on one side near the central axis of the stator core (22). The sealing frame (224) is arranged inside the stator core (22) along the axial direction of the stator core (22) and seals the slot of the stator slot (225). The two ends of the sealing frame (224) extend out of the stator core (22) and are respectively sealed and connected to the first sealing ring (3) and the second sealing ring (4).

5. The motor according to claim 4, characterized in that, The sealing frame (224) includes first sealing portions (2241) located at both axial ends and a plurality of second sealing portions (2242) located between the two first sealing portions (2241) and spaced circumferentially along the stator core (22). The second sealing portions (2242) are located in the corresponding stator slots (225) on the second core segment (222) and the third core segment (223), and seal the corresponding slots (225) on the second core segment (222) and the third core segment (223). The slot opening of the stator slot (225) is such that the inner diameters of the second core segment (222) and the third core segment (223) are the same and smaller than the inner diameter of the first core segment (221). The inner circumferential surface of the first core segment (221) and its adjacent second core segment (222) form a receiving groove (226). The first sealing part (2241) is located in the receiving groove (226) and seals the slot opening of the corresponding stator slot (225) on the first core segment (221).

6. The motor according to claim 4, characterized in that, The first sealing ring (3) includes a first ring body (32) and a first sealing ring (33). The first sealing ring (33) is sleeved on the outside of the first ring body (32), and the first sealing ring (33) abuts against the inner wall of the housing (1) in the radial direction of the housing (1). The end face of one end of the first ring body (32) along its axial direction abuts against the housing (1). The other end of the first ring body (32) along its axial direction is provided with one of the first annular groove (71) and the first annular boss (72). The sealing skeleton (224) is provided with the other of the first annular groove (71) and the first annular boss (72) at one end along its axial direction. The first annular boss (72) is inserted into the first annular groove (71). And / or, the second sealing ring (4) includes a second ring body (42) and a second sealing ring (43), the second sealing ring (43) is sleeved on the outside of the second ring body (42), and the second sealing ring (43) abuts against the inner wall of the housing (1) in the radial direction of the housing (1), the end face of one end of the second ring body (42) along its axial direction abuts against the housing (1), the other end of the second ring body (42) along its axial direction is provided with one of the second annular groove (73) and the second annular boss (74), the other end of the sealing skeleton (224) along its axial direction is provided with the other of the second annular groove (73) and the second annular boss (74), and the second annular boss (74) is inserted into the second annular groove (73).

7. The motor according to claim 1, characterized in that, The housing (1) includes a first end cap (11), a housing (12), and a second end cap (13) arranged sequentially along its axial direction. The first end cap (11) and the second end cap (13) are respectively provided with a first oil passage (16) and a second oil passage (17) at the end facing the stator assembly (2). The housing (12) is provided with an oil inlet (14), an oil outlet (15), and a third oil passage (18) penetrating the end faces of both ends of the housing (12) along its axial direction. The third oil passage (18) is connected to the first oil passage (16) and the second oil passage (17) at both ends along the axial direction of the housing (12), and the oil outlet (15) is connected to the middle part of the third oil passage (18).

8. The motor according to claim 1, characterized in that, The oil inlet (14) and the oil outlet (15) are located at the bottom of the housing (1), and the oil outlet (15) is located at the lowest point of the housing (1).

9. A vehicle, characterized in that, Includes the motor as described in any one of claims 1 to 8.

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