Motor cooling structure, motor and vehicle

Abstract

The invention provides a motor cooling structure, a motor and a vehicle, and relates to the technical field of vehicle parts, the motor cooling structure comprises a stator winding, a stator core, a first oil ring, a second oil ring and a shell; a first oil cavity is defined by the first oil ring, the shell and the stator iron core, a second oil cavity is defined by the second oil ring, the shell and the stator iron core, the first oil spraying hole and the second oil spraying hole are communicated with the first oil cavity and the second oil cavity respectively, and the oil inlet hole is communicated with the first oil cavity. The stator iron core is provided with a first cooling channel, a second cooling channel and a third cooling channel, the two opposite ends of the first cooling channel are communicated with the first oil cavity and the second oil cavity respectively, and the two opposite ends of the third cooling channel face the two axial ends of the stator winding respectively. The two opposite ends of the second cooling channel communicate with the middle position of the first cooling channel and the middle position of the third cooling channel correspondingly. Therefore, the stator winding and the stator iron core can be cooled in multiple directions, and the cooling efficiency and the cooling effect of the motor stator are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle components, and more particularly, to a motor cooling structure, a motor, and a vehicle. Background Art

[0002] With the rapid development of the new energy vehicle industry, while increasing the number of drive motors, the performance requirements for motors are also getting higher and higher, making the cooling design of motors particularly important.

[0003] Currently, when cooling the motor stator and stator windings, axial oil passages are usually opened in the yoke part of the stator core, and the oil enters the axial oil passages from the middle part of the stator core and then diverges towards both ends of the stator core to cool the stator core and stator windings. However, the flow path of the oil on the stator core is relatively short, resulting in a relatively limited oil contact area on the core part, poor cooling effect, and low cooling efficiency. Summary of the Invention

[0004] The problem to be solved by the present invention is: how to improve the cooling effect and efficiency of the motor stator.

[0005] To solve the above problems, the present invention provides a motor cooling structure, a motor, and a vehicle.

[0006] In a first aspect, the present invention provides a motor cooling structure, including a stator winding, a stator core, a first oil ring provided with a first oil injection hole, a second oil ring provided with a second oil injection hole, and a housing provided with an oil inlet hole; the first oil ring and the second oil ring are respectively arranged at the axial two ends of the stator core and respectively sleeved outside the parts where the stator winding extends out of the stator core, the first oil ring and the housing and the stator core enclose a first oil cavity, the second oil ring and the housing and the stator core enclose a second oil cavity, the first oil injection hole and the second oil injection hole are respectively communicated with the first oil cavity and the second oil cavity, and the oil inlet hole is communicated with the first oil cavity;

[0007] The stator core is provided with a cooling oil passage, and the cooling oil passage includes a first cooling channel, a second cooling channel, and a third cooling channel. The opposite ends of the first cooling channel respectively penetrate the end faces at the axial two ends of the stator core and are respectively communicated with the first oil cavity and the second oil cavity. The opposite ends of the third cooling channel respectively penetrate the end faces at the axial two ends of the stator core and respectively face the axial two ends of the stator winding. The opposite ends of the second cooling channel are respectively communicated with the middle positions of the first cooling channel and the third cooling channel.

[0008] Optionally, the first cooling channel and the third cooling channel are axially penetrated through the stator core, and the second cooling channel is radially arranged along the stator core.

[0009] Optionally, a plurality of stator slots evenly distributed along the circumferential direction of the stator core are further provided on the stator core. A plurality of the cooling oil channels are provided on the stator core. Each cooling oil channel is located between two adjacent stator slots along the circumferential direction of the stator core. Along the radial direction of the stator core, the first cooling channel is arranged between the outer side surface of the stator core and the stator slot. The first cooling channel, the second cooling channel and the third cooling channel are sequentially arranged along the radial direction of the stator core.

[0010] Optionally, the stator core includes a first core segment, a second core segment and a third core segment sequentially arranged along its axial direction. The first core segment is provided with a first through slot and a second through slot axially penetrating therethrough. The second core segment is provided with a third through slot axially penetrating therethrough. The third core segment is provided with a fourth through slot and a fifth through slot axially penetrating therethrough. The third through slot includes a first slot segment, a second slot segment and a third slot segment sequentially arranged and communicated along the radial direction of the second core segment. The first through slot, the first slot segment and the fourth through slot are sequentially communicated along the axial direction of the stator core to form the first cooling channel. The second slot segment forms the second cooling channel. The second through slot, the third slot segment and the fifth through slot are sequentially communicated along the axial direction of the stator core to form the third cooling channel.

[0011] Optionally, the cross-sectional area of the first through slot is larger than the cross-sectional areas of the first slot segment and the fourth through slot.

[0012] Optionally, the first core segment includes a plurality of first core punching sheets provided with a first oil hole and a second oil hole. The second core segment includes a plurality of second core punching sheets provided with a third oil hole. The third core segment includes a plurality of third core punching sheets provided with a fourth oil hole and a fifth oil hole. The first oil holes of the plurality of first core punching sheets are sequentially communicated axially to form the first through slot. The second oil holes of the plurality of first core punching sheets are sequentially communicated axially to form the second through slot. The third oil holes of the plurality of second core punching sheets are sequentially communicated axially to form the third through slot. The fourth oil holes of the plurality of third core punching sheets are sequentially communicated axially to form the fourth through slot. The fifth oil holes of the plurality of third core punching sheets are sequentially communicated axially to form the fifth through slot.

[0013] Optionally, the housing includes a detachably connected housing body and an end cover. The housing body, the stator core and the first oil ring enclose the first oil chamber. The housing body, the stator core and the second oil ring enclose the second oil chamber. The first oil ring is located at one end of the stator core away from the end cover. The oil inlet hole is provided at one end of the housing body away from the end cover.

[0014] Optionally, the motor cooling structure further includes a first annular seal and a second annular seal respectively disposed at two axial ends of the first oil ring. Two axial ends of the first annular seal respectively abut against the housing body and the first oil ring, and two axial ends of the second annular seal respectively abut against the stator core and the first oil ring;

[0015] And / or, it further includes a third annular seal and a fourth annular seal respectively disposed at two axial ends of the second oil ring. The third annular seal is sleeved outside the second oil ring and radially abuts against the inner wall of the housing body along the second oil ring, and two axial ends of the fourth annular seal respectively abut against the stator core and the second oil ring.

[0016] In a second aspect, the present invention provides a motor including the motor cooling structure as described above.

[0017] In a third aspect, the present invention provides a vehicle including the motor cooling structure or the motor as described above.

[0018] The beneficial effects of the motor cooling structure of the present invention are as follows: By respectively arranging a first oil ring with a first oil injection hole and a second oil ring with a second oil injection hole at the axial two ends of the stator core, and enclosing a first oil chamber with the first oil ring, the housing and the stator core, and enclosing a second oil chamber with the second oil ring, the housing and the stator core, it is convenient to use the first oil chamber and the second oil chamber to accommodate the cooling oil, ensuring that a sufficient amount of cooling oil can be sprayed from the oil injection holes of the oil rings towards the ends of the stator windings. At the same time, by arranging an oil inlet hole communicating with the first oil chamber on the housing, oil can be introduced from one axial end of the stator core, which can reduce the oil inlet resistance compared with introducing oil from the middle position of the stator core, prevent the cooling oil from penetrating between the inner wall of the housing and the stator core due to the large resistance, and further ensure that there is a large frictional force between the stator core and the housing and no relative rotation occurs. Moreover, by respectively connecting the first oil injection hole and the second oil injection hole with the first oil chamber and the second oil chamber, arranging a first cooling channel, a second cooling channel and a third cooling channel on the stator core, connecting the opposite ends of the first cooling channel with the first oil chamber and the second oil chamber respectively at the axial end faces of the stator core, arranging the opposite ends of the third cooling channel opposite to the axial two ends of the stator winding respectively at the axial end faces of the stator core, and connecting the opposite ends of the second cooling channel with the middle positions of the first cooling channel and the third cooling channel respectively. In this way, when the cooling oil enters the housing from the oil inlet hole, a part of the cooling oil is sprayed from the first oil chamber and the first oil injection hole onto the outer side of one axial end of the stator winding to spray-cool the outer side of one end of the stator winding, and another part of the cooling oil flows from the first oil chamber into the first cooling channel and is branched at the middle position of the first cooling channel. One branch of the cooling oil reaches the second oil chamber through the first cooling channel and is sprayed from the second oil injection hole onto the outer side of the other axial end of the stator winding to spray-cool the outer side of the other end of the stator winding, and the other branch of the cooling oil flows from the middle position of the first cooling channel into the second cooling channel and flows towards the axial root of the stator winding through the opposite ends of the third cooling channel to spray-cool the axial root of the stator winding. Moreover, the cooling oil flowing in the first cooling channel and the second cooling channel can cool the yoke part of the stator core, and the cooling oil flowing in the third cooling channel can cool the stator winding arranged in, for example, the stator slots and the tooth part of the stator core. In this way, the stator winding and the stator core are cooled in multiple directions, achieving cooling from the heat source (i.e., the winding in the slot and the winding root), realizing the purpose of significantly reducing the temperature of the stator assembly, effectively solving the problem of high temperature of the winding in the slot and the winding root. At the same time, this cooling method can increase the contact area between the cooling oil and the stator core and the stator winding, thereby increasing the heat dissipation area of the stator assembly and improving the cooling efficiency and cooling effect of the motor stator. Description of the Drawings

[0019] Figure 1Explosion structure schematic diagram of the motor cooling structure in the embodiment of the present invention;

[0020] Figure 2 Cross-sectional schematic diagram of the motor cooling structure in the embodiment of the present invention;

[0021] Figure 3 Partial cross-sectional schematic diagram of the motor cooling structure at the cooling oil circuit in the embodiment of the present invention;

[0022] Figure 4 Route schematic diagram of the cooling oil circuit of the motor cooling structure in the embodiment of the present invention;

[0023] Figure 5 Structure schematic diagram of the stator core in the embodiment of the present invention;

[0024] Figure 6 Cross-sectional schematic diagram of the stator core in the embodiment of the present invention;

[0025] Figure 7 Structure schematic diagram of the first core punching in the embodiment of the present invention;

[0026] Figure 8 Structure schematic diagram of the second core punching in the embodiment of the present invention;

[0027] Figure 9 Structure schematic diagram of the third core punching in the embodiment of the present invention;

[0028] Figure 10 Assembly schematic diagram of the first oil ring with the first annular seal and the second annular seal in the embodiment of the present invention;

[0029] Figure 11 Assembly schematic diagram of the second oil ring with the third annular seal and the fourth annular seal in the embodiment of the present invention.

[0030] Explanation of reference numerals:

[0031] 1. Stator winding; 2. Stator core; 21. First core segment; 211. First core punching; 2111. First oil hole; 2112. Second oil hole; 212. First through groove; 213. Second through groove; 22. Second core segment; 221. Second core punching; 2211. Third oil hole; 2211a. First hole segment; 2211b. Second hole segment; 2211c. Third hole segment; 222. Third through groove; 2221. First groove segment; 2222. Second groove segment; 2223. Third groove segment; 23. Third core segment; 231. Third core punching; 2311. Fourth oil hole; 2312. Fifth oil hole; 232. Fourth through groove; 233. Fifth through groove; 24. First cooling channel; 25. Second cooling channel; 26. Third cooling channel; 27. Stator slot; 3. First oil ring; 31. First oil injection hole; 32. First annular groove; 33. Second annular groove; 4. Second oil ring; 41. Second oil injection hole; 42. Third annular groove; 43. Fourth annular groove; 5. Housing; 51. Housing body; 511. Oil inlet hole; 512. Communication groove; 513. Shoulder structure; 52. End cover; 6. First annular seal; 7. Second annular seal; 8. Third annular seal; 9. Fourth annular seal; 10. First oil chamber; 11. Second oil chamber. Detailed implementation manners

[0032] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention 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 described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0033] As used herein, the term "including" and its variants are open-ended, that is, "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"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependent relationships.

[0034] It should be noted that the modifiers "a" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless clearly specified otherwise in the context, it should be understood as "one or more".

[0035] In the related art, when cooling the motor stator and the stator winding, axial oil holes are usually opened in the yoke part of the stator core, and the oil fluid enters the axial oil holes from the middle part of the stator core and then branches out to both ends of the stator core to cool the stator core and the stator winding. However, the flow path of the oil fluid on the stator core is relatively short, resulting in a relatively limited oil contact area of the core part, poor cooling effect, and low cooling efficiency.

[0036] Aiming at the problems existing in the above-mentioned related art, the present invention provides a motor cooling structure, a motor and a vehicle.

[0037] Combined with Figures 1 to 4 As shown, a motor cooling structure provided by an embodiment of the present invention includes a stator winding 1, a stator core 2, a first oil ring 3 provided with a first oil injection hole 31, a second oil ring 4 provided with a second oil injection hole 41, and a housing 5 provided with an oil inlet hole 511; the first oil ring 3 and the second oil ring 4 are respectively arranged at both axial ends of the stator core 2 and are respectively sleeved outside the parts where the stator winding 1 extends out of the stator core 2. The first oil ring 3, the housing 5 and the stator core 2 enclose a first oil chamber 10, and the second oil ring 4, the housing 5 and the stator core 2 enclose a second oil chamber 11. The first oil injection hole 31 and the second oil injection hole 41 are respectively communicated with the first oil chamber 10 and the second oil chamber 11, and the oil inlet hole 511 is communicated with the first oil chamber 10;

[0038] The stator core 2 is provided with a cooling oil path, and the cooling oil path includes a first cooling channel 24, a second cooling channel 25 and a third cooling channel 26. The opposite ends of the first cooling channel 24 respectively penetrate through the end faces at both axial ends of the stator core 2 and are respectively communicated with the first oil chamber 10 and the second oil chamber 11. The opposite ends of the third cooling channel 26 respectively penetrate through the end faces at both axial ends of the stator core 2 and are respectively arranged opposite to both axial ends of the stator winding 1. The opposite ends of the second cooling channel 25 are respectively communicated with the middle positions of the first cooling channel 24 and the third cooling channel 26.

[0039] Specifically, the motor cooling structure mainly includes a housing 5 and a stator winding 1, a stator core 2, a first oil ring 3, and a second oil ring 4 disposed within the housing 5. Among them, the stator winding 1 is axially inserted into, for example, the stator slots 27 of the stator core 2 along the axial direction of the stator core 2 and extends out from both axial ends of the stator core 2, that is, the axial ends of the stator winding 1 extend out of the stator core 2, while the first oil ring 3 and the second oil ring 4 are respectively sleeved outside both axial ends of the stator winding 1. Moreover, both axial ends of the first oil ring 3 are respectively abutted against the housing 5 and the stator core 2, and both axial ends of the second oil ring 4 are also respectively abutted against the housing 5 and the stator core 2. The first oil ring 3, the housing 5, and the stator core 2 enclose a closed first oil chamber 10, and the second oil ring 4, the housing 5, and the stator core 2 enclose a closed second oil chamber 11. The first oil ring 3 and the second oil ring 4 are of an annular structure, and the first oil chamber 10 and the second oil chamber 11 enclosed by them and the housing 5 and the stator core 2 are annular cavities. An oil inlet hole 511 communicating with the first oil chamber 10 is provided on the housing wall of the housing 5. The first oil ring 3 may be provided with a plurality of first spray holes 31 penetrating along its radial direction. The plurality of first spray holes 31 are evenly distributed along the circumferential direction of the first oil ring 3 and communicate with the first oil chamber 10. That is to say, the first spray holes 31 can communicate the space enclosed by the first oil ring 3 itself and the first oil chamber 10, so that after the cooling oil enters the housing 5 from the oil inlet hole 511, it can be sprayed onto one axial end of the stator winding 1 surrounded by the first oil ring 3 through the first oil chamber 10 and the first spray holes 31 to perform spray cooling on the outer side surface of one end of the stator winding 1. The second oil ring 4 may be provided with a plurality of second spray holes 41 penetrating along its radial direction. The plurality of second spray holes 41 are evenly distributed along the circumferential direction of the second oil ring 4 and communicate with the second oil chamber 11. That is to say, the second spray holes 41 communicate the space enclosed by the second oil ring 4 itself and the second oil chamber 11, so that the cooling oil entering the second oil chamber 11 can be sprayed onto the other axial end of the stator winding 1 surrounded by the second oil ring 4 from the second spray holes 41 to perform spray cooling on the outer side surface of the other end of the stator winding 1.

[0040] More specifically, a cooling oil passage is provided on the stator core 2. The cooling oil passage includes a first cooling channel 24, a second cooling channel 25, and a third cooling channel 26. The first cooling channel 24 can be provided on the yoke portion of the stator core 2, and the third cooling channel 26 can be provided on the tooth portion of the stator core 2 or at a position close to the tooth portion. Herein, the yoke portion of the stator core 2 refers to the portion between the bottom of the stator slot 27 and the outer side surface of the stator core 2, and the portion separating the stator slots 27 is called the tooth portion of the stator core 2. The first cooling channel 24 and the third cooling channel 26 can be axially penetratingly provided along the stator core 2, or can be inclined relative to the axis of the stator core 2 and penetrate the stator core 2, that is, both ends (also the opposite ends) of the first cooling channel 24 in its length direction respectively penetrate the end faces at both axial ends of the stator core 2, and both ends (also the opposite ends) of the third cooling channel 26 in its length direction also respectively penetrate the end faces at both axial ends of the stator core 2; the second cooling channel 25 can be provided radially along the stator core 2, or can be inclined relative to the radial direction of the stator core 2, and both ends (also the opposite ends) of the second cooling channel 25 in its length direction are respectively communicated with the middle positions of the first cooling channel 24 and the third cooling channel 26. That is to say, the second cooling channel 25 is provided inside the stator core 2 and does not penetrate the stator core 2. At the same time, both opposite ends of the first cooling channel 24 are respectively located radially outside the first oil ring 3 and the second oil ring 4, and are respectively communicated with the first oil chamber 10 and the second oil chamber 11. That is, the end of the first cooling channel 24 close to the first oil ring 3 is located outside the orthographic projection on the stator core 2 of the end of the first oil ring 3 close to the stator core 2, and the end of the first cooling channel 24 close to the second oil ring 4 is located outside the orthographic projection on the stator core 2 of the end of the second oil ring 4 close to the stator core 2. Both opposite ends of the third cooling channel 26 are respectively located radially inside the first oil ring 3 and the second oil ring 4, that is, the end of the third cooling channel 26 close to the first oil ring 3 is located inside the orthographic projection on the stator core 2 of the end of the first oil ring 3 close to the stator core 2, and the end of the third cooling channel 26 close to the second oil ring 4 is located inside the orthographic projection on the stator core 2 of the end of the second oil ring 4 close to the stator core 2. Moreover, both opposite ends of the third cooling channel 26 are respectively arranged opposite to both axial ends of the stator winding 1, so that the cooling oil flowing out from both opposite ends of the third cooling channel 26 can be sprayed onto the axial roots of the stator winding 1 (that is, the portion on the end of the stator winding 1 extending out of the stator core 2 close to the stator core 2) to perform oil spraying cooling on the axial roots of the stator winding 1.

[0041] In this embodiment, the motor cooling structure can be achieved by respectively arranging a first oil ring 3 with a first oil injection hole 31 and a second oil ring 4 with a second oil injection hole 41 at both axial ends of the stator core 2, and enclosing a first oil cavity 10 by the first oil ring 3, the housing 5 and the stator core 2, and enclosing a second oil cavity 11 by the second oil ring 4, the housing 5 and the stator core 2, so as to facilitate using the first oil cavity 10 and the second oil cavity 11 to accommodate the cooling oil, ensuring that a sufficient amount of cooling oil can be sprayed from the oil injection holes of the oil rings towards the ends of the stator winding 1. At the same time, by arranging an oil inlet hole 511 communicating with the first oil cavity 10 on the housing 5 to achieve oil inlet from one axial end of the stator core 2, compared with oil inlet from the middle position of the stator core 2, the oil inlet resistance can be reduced, preventing the cooling oil from penetrating between the inner wall of the housing 5 and the stator core 2 due to large resistance, and further ensuring that there is a large frictional force between the stator core 2 and the housing 5 and no relative rotation will occur.Moreover, by connecting the first fuel injection hole 31 and the second fuel injection hole 41 to the first oil chamber 10 and the second oil chamber 11 respectively, by providing a first cooling channel 24, a second cooling channel 25 and a third cooling channel 26 on the stator core 2, and connecting the opposite ends of the first cooling channel 24 to the first oil chamber 10 and the second oil chamber 11 respectively at the axial end faces of the stator core 2, arranging the opposite ends of the third cooling channel 26 opposite to the axial ends of the stator winding 1 at the axial end faces of the stator core 2, and connecting the opposite ends of the second cooling channel 25 to the middle positions of the first cooling channel 24 and the third cooling channel 26 respectively. In this way, when the cooling oil enters the housing 5 from the oil inlet hole 511, a part of the cooling oil is sprayed onto the outer side surface of one axial end of the stator winding 1 through the first oil chamber 10 and the first fuel injection hole 31 to perform fuel injection cooling on the outer side surface of one end of the stator winding 1. Another part of the cooling oil flows from the first oil chamber 10 into the first cooling channel 24 and is branched at the middle position of the first cooling channel 24. One branch of the cooling oil reaches the second oil chamber 11 through the first cooling channel 24 and is sprayed onto the outer side surface of the other axial end of the stator winding 1 from the second fuel injection hole 41 to perform fuel injection cooling on the outer side surface of the other end of the stator winding 1. The other branch of the cooling oil flows from the middle position of the first cooling channel 24 into the second cooling channel 25 and flows to the axial root of the stator winding 1 through the opposite ends of the third cooling channel 26 to perform fuel injection cooling on the axial root of the stator winding 1. Moreover, the cooling oil flowing in the first cooling channel 24 and the second cooling channel 25 can cool the yoke portion of the stator core 2, and the cooling oil flowing in the third cooling channel 26 can cool the stator winding 1 arranged in, for example, the stator slot 27 and the tooth portion of the stator core 2. Thus, multi-directional cooling of the stator winding 1 and the stator core 2 is achieved, cooling is performed from the heat source (i.e., the in-slot winding and the winding root), the purpose of significantly reducing the temperature of the stator assembly is realized, the problem of high temperature of the in-slot winding and the winding root can be effectively solved. At the same time, this cooling method can increase the contact area between the cooling oil and the stator core 2 and the stator winding 1, thereby increasing the heat dissipation area of the stator assembly and improving the cooling efficiency and cooling effect of the motor stator.

[0042] Furthermore, as Figure 3 shown, a communication groove 512 is provided on the inner wall of the housing 5, and the oil inlet hole 511 is communicated with the first oil chamber 10 through the communication groove 512. Thus, the oil inlet resistance when the cooling oil flows into the first oil chamber 10 is further reduced.

[0043] Furthermore, in combination with Figure 3As shown, a shoulder structure 513 is further provided on the inner wall of the housing 5, and one end of the stator core 2 close to the first oil ring 3 abuts against the shoulder structure 513 axially. In this way, it is possible to further prevent the cooling oil from penetrating from the first oil chamber 10 between the inner wall of the housing 5 and the stator core 2, ensuring that there is no relative rotation between the housing 5 and the stator core 2.

[0044] Optionally, in combination with Figure 3 As shown, the first cooling channel 24 and the third cooling channel 26 are arranged axially through the stator core 2, and the second cooling channel 25 is arranged radially with respect to the stator core 2. Compared with arranging each cooling channel obliquely, on the one hand, it is convenient for processing and manufacturing, and on the other hand, when ensuring that the contact area between the stator core 2 and the cooling oil is sufficient, the time for the cooling oil to flow out of the stator core 2 can be shortened, enabling the cooling oil to quickly flow to the end and axial root of the stator winding 1 through the cooling oil passage on the stator core 2, improving the cooling efficiency.

[0045] Optionally, in combination with Figures 3 to 5 As shown, a plurality of stator slots 27 evenly distributed in the circumferential direction are further provided on the stator core 2. A plurality of cooling oil passages are provided on the stator core 2. Each cooling oil passage is located between two adjacent stator slots 27 in the circumferential direction of the stator core 2, and in the radial direction of the stator core 2, the first cooling channel 24 is arranged between the outer side surface of the stator core 2 and the stator slot 27, and the first cooling channel 24, the second cooling channel 25, and the third cooling channel 26 are arranged in sequence in the radial direction of the stator core 2.

[0046] In this alternative embodiment, if the first cooling channel 24 is provided on the outer side surface of the stator core 2, the cooling oil flowing into the first cooling channel 24 from the first oil chamber 10 will adhere to the inner wall of the housing 5 due to its certain viscosity, which not only causes a certain waste, but also reduces the amount of cooling oil for cooling the motor stator and lowers the cooling effect. Therefore, in this embodiment, by providing the first cooling channel 24 between the outer side surface of the stator core 2 and the stator slots 27, the first cooling channel 24 is provided within the yoke portion of the stator core 2 instead of on the outer side surface of the stator core 2. In this way, even if the cooling oil adheres to the inner wall of the first cooling channel 24 due to its viscosity, it adheres to the inside of the stator core 2, thereby cooling the yoke portion of the stator core 2 and not causing waste. Moreover, the cooling oil path on the stator core 2 is provided between two adjacent stator slots 27, that is, the cooling oil path is adjacent to these two adjacent stator slots 27 in the circumferential direction of the stator core 2. In this way, it is convenient to select to provide the cooling oil path between multiple groups of two adjacent stator slots 27 according to the actual cooling requirements. In a cooling oil path, the third cooling channel 26 can be located between two adjacent stator slots 27, and the first cooling channel 24, the second cooling channel 25, and the third cooling channel 26 are arranged and communicated in sequence along the radial direction of the stator core 2. In this way, it is ensured that the cooling oil entering the stator core 2 can reach the tooth portion of the stator core 2 through the second cooling channel 25 and the third cooling channel 26, thereby improving the cooling effect on the tooth portion of the stator core 2 and the winding in the slot.

[0047] Optionally, as shown in combination with Figure 5 As shown, a plurality of cooling oil paths are provided on the stator core 2, and the plurality of cooling oil paths and the plurality of stator slots 27 are alternately arranged along the circumferential direction of the stator core 2. Among them, the first cooling channels 24 in the plurality of cooling oil paths are all communicated with the first oil chamber 10 and the second oil chamber 11. When the number of cooling oil paths is the same as the number of stator slots 27, the alternate arrangement of the plurality of cooling oil paths and the plurality of stator slots 27 along the circumferential direction of the stator core 2 can be understood as the alternate arrangement of one cooling oil path and one stator slot 27, that is, one cooling oil path is provided between every two adjacent stator slots 27; when the number of stator slots 27 is a multiple of the number of cooling oil paths, the alternate arrangement of the plurality of cooling oil paths and the plurality of stator slots 27 along the circumferential direction of the stator core 2 can be understood as the alternate arrangement of one cooling oil path and a plurality of stator slots 27, that is, a plurality of stator slots 27 are provided between every two adjacent cooling oil paths. In this way, by providing a plurality of cooling oil paths on the stator core 2, the contact area between the stator core 2 and the cooling oil is increased to improve the cooling effect. At the same time, by alternately arranging the plurality of cooling oil paths and the plurality of stator slots 27 along the circumferential direction of the stator core 2, the uniform cooling of the stator core 2 is ensured. And, through the third cooling channels 26 in the plurality of cooling oil paths, the uniform cooling of the end portion of the stator winding 1 can be improved, thereby further improving the cooling effect.

[0048] Optionally, as shown in combination withFigure 3 , Figure 5 and Figure 6 As shown in Figure 3 , Figure 5 and Figure 6 , the stator core 2 includes a first core segment 21, a second core segment 22 and a third core segment 23 arranged in sequence along its axial direction. The first core segment 21 is provided with a first through groove 212 and a second through groove 213 penetrating along the axial direction. The second core segment 22 is provided with a third through groove 222 penetrating along its axial direction. The third core segment 23 is provided with a fourth through groove 232 and a fifth through groove 233 penetrating along its axial direction. The third through groove 222 includes a first groove segment 2221, a second groove segment 2222 and a third groove segment 2223 arranged and communicated in sequence along the radial direction of the second core segment 22. The first through groove 212, the first groove segment 2221 and the fourth through groove 232 are communicated in sequence along the axial direction of the stator core 2 to form a first cooling channel 24. The second groove segment 2222 forms a second cooling channel 25. The second through groove 213, the third groove segment 2223 and the fifth through groove 233 are communicated in sequence along the axial direction of the stator core 2 to form a third cooling channel 26.

[0049] Specifically, the first core segment 21 and the third core segment 23 are respectively the two end parts of the stator core 2, and the second core segment 22 is the middle part of the stator core 2. Moreover, the number of the first core segment 21, the second core segment 22 and the third core segment 23 can be one or multiple. For example, Figure 5 shows an example in which each of the first core segment 21, the second core segment 22 and the third core segment 23 has one. The first groove segment 2221 of the third through groove 222 refers to the part where the third through groove 222 is communicated with the first through groove 212 and the fourth through groove 232. The third groove segment 2223 of the third through groove 222 refers to the part where the third through groove 222 is communicated with the second through groove 213 and the fifth through groove 233. The remaining part of the third through groove 222 is the second groove segment 2222.

[0050] In this alternative embodiment, by providing a through-groove structure on each core segment of the stator core 2, it is convenient to perform segmented design on the stator core 2 and the cooling oil circuit, thereby reducing the design difficulty and production difficulty. At the same time, by sequentially connecting the first through-groove 212 of the first core segment 21, the first groove segment 2221 of the second core segment 22, and the fourth through-groove 232 of the third core segment 23 along the axial direction of the stator core 2 to form a first cooling channel 24, taking the second groove segment 2222 of the second core segment 22 as a second cooling channel 25, and sequentially connecting the second through-groove 213 of the first core segment 21, the third groove segment 2223 of the second core segment 22, and the fifth through-groove 233 of the third core segment 23 along the axial direction of the stator core 2 to form a third cooling channel 26, the through-groove structures on different core segments are connected into a cooling oil circuit. Moreover, by axially penetrating the through-groove structures on each core segment, the structure of the core laminations of each core segment can be ensured to be consistent. In this way, not only the difficulty of laminating and assembling multiple core laminations into a core segment is reduced, but also the types of core laminations can be reduced, facilitating material management.

[0051] Optionally, in combination with Figure 6 As shown, the cross-sectional area of the first through-groove 212 is larger than the cross-sectional areas of the first groove segment 2221 and the fourth through-groove 232.

[0052] Since the cooling oil will first exchange heat with the first oil ring 3 after entering the housing 5 from the oil inlet hole 511, thereby absorbing the heat of the stator winding 1 and the stator core 2, causing the temperature of the cooling oil to rise, and then flowing into the stator core 2 and flowing through the first cooling channel 24 to the second oil ring 4, the temperature of the cooling oil in the stator core 2 and the cooling oil sprayed from the second spray holes 41 of the second oil ring 4 is higher than the temperature of the cooling oil sprayed from the first spray holes 31 of the first oil ring 3. As a result, the cooling effect of the stator winding 1 near the oil inlet hole 511 and the stator core 2 and the stator winding 1 far from the oil inlet hole 511 has a large deviation. Therefore, in this embodiment, by setting the cross-sectional area of the first through-groove 212 to be larger than the cross-sectional areas of the first groove segment 2221 and the fourth through-groove 232, the amount of cooling oil entering the stator core 2 is increased, so that more cooling oil cools the stator core 2 and the stator winding 1 far from the oil inlet hole 511, improving the cooling effect, and thus the problem of large deviation in the cooling effect at both ends of the winding caused by arranging the oil inlet hole 511 at one end of the winding can be solved.

[0053] Optionally, in combination with Figure 5 、 Figures 7 to 9As shown, the first iron core segment 21 includes a plurality of first iron core punching sheets 211 provided with first oil holes 2111 and second oil holes 2112, the second iron core segment 22 includes a plurality of second iron core punching sheets 221 provided with third oil holes 2211, and the third iron core segment 23 includes a plurality of third iron core punching sheets 231 provided with fourth oil holes 2311 and fifth oil holes 2312. The first oil holes 2111 of the plurality of first iron core punching sheets 211 are sequentially communicated axially to form a first through groove 212, the second oil holes 2112 of the plurality of first iron core punching sheets 211 are sequentially communicated axially to form a second through groove 213, the third oil holes 2211 of the plurality of second iron core punching sheets 221 are sequentially communicated axially to form a third through groove 222, the fourth oil holes 2311 of the plurality of third iron core punching sheets 231 are sequentially communicated axially to form a fourth through groove 232, and the fifth oil holes 2312 of the plurality of third iron core punching sheets 231 are sequentially communicated axially to form a fifth through groove 233.

[0054] In this optional embodiment, the first iron core segment 21, the second iron core segment 22, and the third iron core segment 23 are all formed by stacking a plurality of annular iron core laminations. Moreover, a plurality of oil hole structures evenly distributed in the circumferential direction can be provided on each iron core lamination. Among them, the first oil hole 2111 and the second oil hole 2112 on the first iron core lamination 211 can be rectangular hole structures, the third oil hole 2211 on the second iron core lamination 221 can be a T-shaped hole structure, and the fourth oil hole 2311 and the fifth oil hole 2312 on the third iron core lamination 231 can be long hole structures extending in the radial direction. The third oil hole 2211 of the second iron core lamination 221 includes a first hole segment 2211a, a second hole segment 2211b, and a third hole segment 2211c that are sequentially arranged and communicated in the radial direction. Among them, the first hole segment 2211a is the horizontal part of the T-shaped hole, and the second hole segment 2211b and the third hole segment 2211c are the vertical parts of the T-shaped hole. Moreover, the first hole segments 2211a of a plurality of second iron core laminations 221 are sequentially communicated in the axial direction to form a first groove segment 2221, the second hole segments 2211b of a plurality of second iron core laminations 221 are sequentially communicated in the axial direction to form a second groove segment 2222, and the third hole segments 2211c of a plurality of second iron core laminations 221 are sequentially communicated in the axial direction to form a third groove segment 2223. Furthermore, the opening area of the first oil hole 2111 is larger than the opening areas of the first hole segment 2211a and the fourth oil hole 2311. When stacking the iron core laminations into an iron core segment, the first oil holes 2111 of a plurality of first iron core laminations 211 are sequentially communicated in the axial direction to form a first through groove 212 on the first iron core segment 21, the second oil holes 2112 of a plurality of first iron core laminations 211 are sequentially communicated in the axial direction to form a second through groove 213 on the first iron core segment 21, the third oil holes 2211 of a plurality of second iron core laminations 221 are sequentially communicated in the axial direction to form a third through groove 222 on the second iron core segment 22, the fourth oil holes 2311 of a plurality of third iron core laminations 231 are sequentially communicated in the axial direction to form a fourth through groove 232 on the third iron core segment 23, and the fifth oil holes 2312 of a plurality of third iron core laminations 231 are sequentially communicated in the axial direction to form a fifth through groove 233 on the third iron core segment 23. In this way, the oil hole structures on a plurality of iron core laminations are combined into a through groove structure on the iron core segment.

[0055] Optionally, as shown in combination with Figure 1 and Figure 2 , the housing 5 includes a detachably connected housing body 51 and an end cover 52. The housing body 51, the stator core 2, and the first oil ring 3 enclose a first oil chamber 10, and the housing body 51, the stator core 2, and the second oil ring 4 enclose a second oil chamber 11. Moreover, the first oil ring 3 is located at one end of the stator core 2 away from the end cover 52, and the oil inlet hole 511 is provided at one end of the housing body 51 away from the end cover 52.

[0056] In this alternative embodiment, the housing 5 has a split structure, which facilitates the segmented manufacturing of the housing 5. Moreover, a detachable connection can be achieved between the housing body 51 and the end cover 52 of the housing 5 by means of bolts, which facilitates disassembly and assembly. At the same time, by enclosing the first oil chamber 10 with the housing body 51, the stator core 2, and the first oil ring 3, and enclosing the second oil chamber 11 with the housing body 51, the stator core 2, and the second oil ring 4, both oil chambers are located inside the housing body 51. In this way, it is possible to prevent the assembly gap between the end cover 52 and the housing body 51 from affecting the sealing performance of, for example, the second oil chamber 11. In addition, the oil inlet hole 511 is provided at one end of the housing body 51 away from the end cover 52 to ensure that the oil inlet hole 511 is relatively close to the first oil chamber 10, so that the cooling oil flowing in from the oil inlet hole 511 can quickly reach the first oil chamber 10 for cooling.

[0057] Optionally, as shown in Figure 3 the motor cooling structure further includes a first annular seal 6 and a second annular seal 7 respectively provided at the axial two ends of the first oil ring 3. The axial two ends of the first annular seal 6 respectively abut against the housing body 51 and the first oil ring 3, and the axial two ends of the second annular seal 7 respectively abut against the stator core 2 and the first oil ring 3.

[0058] In this alternative embodiment, when assembling the end cover 52 onto the housing body 51, the end cover 52 can be used to axially press the second oil ring 4 and the stator core 2, and then press the first annular seal 6 and the second annular seal 7, so that the axial two ends of the first annular seal 6 respectively tightly abut against the housing body 51 and the first oil ring 3, and the axial two ends of the second annular seal 7 respectively tightly abut against the stator core 2 and the first oil ring 3. In this way, the first annular seal 6 and the second annular seal 7 are used for axial sealing, thereby improving the sealing performance of the first oil chamber 10 and ensuring the oil injection cooling effect at the first oil ring 3.

[0059] Optionally, as shown in Figure 3 the motor cooling structure further includes a third annular seal 8 and a fourth annular seal 9 respectively provided at the axial two ends of the second oil ring 4. The third annular seal 8 is sleeved outside the second oil ring 4 and radially abuts against the inner wall of the housing body 51, and the axial two ends of the fourth annular seal 9 respectively abut against the stator core 2 and the second oil ring 4.

[0060] In this alternative embodiment, the third annular seal 8 is sleeved outside the second oil ring 4, and the third annular seal 8 abuts against the inner wall of the housing body 51 in the radial direction of the second oil ring 4 to achieve radial sealing. At the same time, when the end cover 52 is assembled to the housing body 51, the axial extrusion force applied by the end cover 52 to the second oil ring 4 causes the two axial ends of the fourth annular seal 9 to tightly abut against the stator core 2 and the second oil ring 4 respectively to achieve axial sealing. In this way, the third annular seal 8 and the fourth annular seal 9 are used for radial sealing and axial sealing respectively, thereby improving the sealing performance of the second oil chamber 11 and ensuring the oil injection cooling effect at the second oil ring 4.

[0061] Further, as shown in Figure 10 , first annular grooves 32 and second annular grooves 33 are respectively provided on the end faces at the two axial ends of the first oil ring 3. The first annular seal 6 and the second annular seal 7 are respectively partially embedded in the first annular grooves 32 and the second annular grooves 33. In this way, the first annular grooves 32 and the second annular grooves 33 are used to position the first annular seal 6 and the second annular seal 7 respectively, which is convenient for assembly. At the same time, the first annular seal 6 and the second annular seal 7 can also be limited respectively to ensure the sealing effect of the annular seals.

[0062] Further, as shown in Figure 11 , a third annular groove 42 is provided on the outer side surface of the end of the second oil ring 4 away from the stator core 2, and a fourth annular groove 43 is provided on the end face of the end of the second oil ring 4 close to the stator core 2. The third annular seal 8 and the fourth annular seal 9 are respectively partially embedded in the third annular grooves 42 and the fourth annular grooves 43. In this way, the third annular grooves 42 and the fourth annular grooves 43 are used to position the third annular seal 8 and the fourth annular seal 9 respectively, which is convenient for assembly. At the same time, the third annular seal 8 and the fourth annular seal 9 can also be limited respectively to ensure the sealing effect of the annular seals.

[0063] A motor provided by an embodiment of the present invention includes the motor cooling structure as described above.

[0064] The beneficial effects of the motor in this embodiment are the same as those of the above-mentioned motor cooling structure and will not be elaborated here.

[0065] A vehicle provided by an embodiment of the present invention includes the motor cooling structure as described above or the motor as described above.

[0066] The beneficial effects of the vehicle in this embodiment are the same as those of the above-mentioned motor cooling structure and will not be elaborated here.

[0067] Although the present invention is disclosed as above, the scope of protection of the present invention 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 these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A motor cooling structure, characterized in that, It includes a stator winding (1), a stator core (2), a first oil ring (3) provided with a first oil injection hole (31), a second oil ring (4) provided with a second oil injection hole (41), and a housing (5) provided with an oil inlet hole (511); the first oil ring (3) and the second oil ring (4) are respectively arranged at two axial ends of the stator core (2), and are respectively sleeved outside the parts of the stator winding (1) extending out of the stator core (2), the first oil ring (3) and the housing (5) and the stator core (2) enclose a first oil chamber (10), the second oil ring (4) and the housing (5) and the stator core (2) enclose a second oil chamber (11), the first oil injection hole (31) and the second oil injection hole (41) are respectively communicated with the first oil chamber (10) and the second oil chamber (11), and the oil inlet hole (511) is communicated with the first oil chamber (10); The stator core (2) is provided with a cooling oil circuit, the cooling oil circuit includes a first cooling channel (24), a second cooling channel (25) and a third cooling channel (26), opposite ends of the first cooling channel (24) respectively penetrate through end faces at two axial ends of the stator core (2), and are respectively communicated with the first oil chamber (10) and the second oil chamber (11), opposite ends of the third cooling channel (26) respectively penetrate through end faces at two axial ends of the stator core (2), and respectively face two axial ends of the stator winding (1), and opposite ends of the second cooling channel (25) are respectively communicated with middle positions of the first cooling channel (24) and the third cooling channel (26).

2. The motor cooling structure according to claim 1, characterized in that, The first cooling channel (24) and the third cooling channel (26) are axially penetratingly arranged along the stator core (2), and the second cooling channel (25) is radially arranged along the stator core (2).

3. The motor cooling structure according to claim 1, characterized in that, The stator core (2) is further provided with a plurality of stator slots (27) evenly distributed along its circumferential direction, the stator core (2) is provided with a plurality of the cooling oil circuits, each cooling oil circuit is located between two adjacent stator slots (27) along the circumferential direction of the stator core (2), and along the radial direction of the stator core (2), the first cooling channel (24) is arranged between the outer side face of the stator core (2) and the stator slot (27), and the first cooling channel (24), the second cooling channel (25) and the third cooling channel (26) are sequentially arranged along the radial direction of the stator core (2).

4. The motor cooling structure according to claim 1, characterized in that, The stator core (2) includes a first core segment (21), a second core segment (22), and a third core segment (23) arranged in sequence along its axial direction. The first core segment (21) is provided with a first through groove (212) and a second through groove (213) penetrating along the axial direction. The second core segment (22) is provided with a third through groove (222) penetrating along its axial direction. The third core segment (23) is provided with a fourth through groove (232) and a fifth through groove (233) penetrating along its axial direction. The third through groove (222) includes a first groove segment (2221), a second groove segment (2222), and a third groove segment (2223) arranged in sequence and communicating along the radial direction of the second core segment (22). The first through groove (212), the first groove segment (2221), and the fourth through groove (232) are sequentially communicated along the axial direction of the stator core (2) to form the first cooling channel (24). The second groove segment (2222) forms the second cooling channel (25). The second through groove (213), the third groove segment (2223), and the fifth through groove (233) are sequentially communicated along the axial direction of the stator core (2) to form the third cooling channel (26).

5. The motor cooling structure according to claim 4, characterized in that, The cross-sectional area of the first through groove (212) is larger than the cross-sectional areas of the first groove segment (2221) and the fourth through groove (232).

6. The motor cooling structure according to claim 4, wherein, The first core segment (21) includes a plurality of first core laminations (211) provided with first oil holes (2111) and second oil holes (2112). The second core segment (22) includes a plurality of second core laminations (221) provided with third oil holes (2211). The third core segment (23) includes a plurality of third core laminations (231) provided with fourth oil holes (2311) and fifth oil holes (2312). The first oil holes (2111) of the plurality of first core laminations (211) are sequentially communicated along the axial direction to form the first through groove (212). The second oil holes (2112) of the plurality of first core laminations (211) are sequentially communicated along the axial direction to form the second through groove (213). The third oil holes (2211) of the plurality of second core laminations (221) are sequentially communicated along the axial direction to form the third through groove (222). The fourth oil holes (2311) of the plurality of third core laminations (231) are sequentially communicated along the axial direction to form the fourth through groove (232). The fifth oil holes (2312) of the plurality of third core laminations (231) are sequentially communicated along the axial direction to form the fifth through groove (233).

7. The motor cooling structure according to claim 1, characterized in that, The housing (5) includes a housing body (51) and an end cover (52) that are detachably connected. The housing body (51), the stator core (2), and the first oil ring (3) enclose the first oil chamber (10). The housing body (51), the stator core (2), and the second oil ring (4) enclose the second oil chamber (11). The first oil ring (3) is located at one end of the stator core (2) away from the end cover (52). The oil inlet hole (511) is provided at one end of the housing body (51) away from the end cover (52).

8. The motor cooling structure according to claim 7, characterized in that, It further includes a first annular seal (6) and a second annular seal (7) respectively arranged at the axial two ends of the first oil ring (3). The axial two ends of the first annular seal (6) respectively abut against the housing body (51) and the first oil ring (3). The axial two ends of the second annular seal (7) respectively abut against the stator core (2) and the first oil ring (3). And / or, it further includes a third annular seal (8) and a fourth annular seal (9) respectively arranged at the axial two ends of the second oil ring (4). The third annular seal (8) is sleeved outside the second oil ring (4) and radially abuts against the inner wall of the housing body (51). The axial two ends of the fourth annular seal (9) respectively abut against the stator core (2) and the second oil ring (4).

9. A motor, characterized in that, It includes the motor cooling structure according to any one of claims 1-8.

10. A vehicle, characterized in that, It includes the motor cooling structure according to any one of claims 1-8 or the motor according to claim 9.

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