Oil cooling structure for electric motor, electric motor, electric driving system and vehicle

Abstract

Provided in the embodiments of the present disclosure are an oil cooling structure for an electric motor, an electric motor, an electric driving system and a vehicle. The oil cooling structure for an electric motor comprises, arranged in the axis direction of an electric motor, an energy storage ring assembly and a plurality of bushings. The plurality of bushings are arranged in stator slots in a stator on an one-to-one basis; the bushings are used for accommodating windings in the stator slots corresponding to the bushings and forming first oil flow-through channels; the energy storage ring assembly is arranged coaxial with the electric motor and used for forming an oil cavity for accommodating portions of the windings extending out of the stator slots. In the oil cooling structure for an electric motor, providing the bushings can form in each stator slot the oil flow-through channels for directionally transferring cooling oil, and the bushings wrap the outer surfaces of the windings in the stator slots corresponding to the bushings, so as to directionally guide the flow of the cooling oil. Providing the energy storage ring assembly can not only form the oil cavity capable of cooling the end portions of the windings extending out of the stator slots, but also provide the cooling oil for each first oil flow-through channel.

Description

Motor oil cooling structure, motor, electric drive system and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311855445.3 and application date December 28, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a motor oil cooling structure, a motor, an electric drive system, and a vehicle. Background Art

[0004] The drive motor in new energy vehicles generates a lot of heat when working. The current common method of motor cooling is to cool the motor stator through cooling oil. The existing oil cooling structure can often only cool the stator core. The cooling oil is difficult to flow into the stator slot from the end face gap of the stator slot. Even if some cooling oil flows into the stator slot, it is easy to flow into the rotor mounting cavity at the opening of the stator slot. The end of the winding and the part located in the stator slot cannot be fully cooled by the cooling oil, which in turn affects the cooling and heat dissipation effect of the entire motor. Summary of the Invention

[0005] In order to solve the above technical problems, the embodiments of the present disclosure provide a motor oil cooling structure, a motor, an electric drive system and a vehicle.

[0006] In a first aspect, an embodiment of the present disclosure provides a motor oil cooling structure, comprising an energy storage ring assembly and a plurality of bushings arranged along the axis of the motor;

[0007] A plurality of bushings are arranged in a one-to-one correspondence in the stator tooth slots on the stator, and the bushings are used to accommodate the windings in the corresponding stator tooth slots and form a first oil groove;

[0008] The energy storage ring assembly is coaxially arranged with the motor and is used to form an oil chamber for accommodating the portion of the winding extending out of the stator tooth slot. The energy storage ring assembly is provided with oil holes arranged in a one-to-one correspondence with the stator tooth slots, and the oil chamber is connected to the first oil groove through the oil holes.

[0009] Optionally, a support structure is formed on the inner wall of the bushing, and the support structure is against the winding to form the first oil groove between the inner wall of the bushing and the winding.

[0010] Optionally, the bushing has a accommodating cavity for accommodating the winding, and a portion of the inner wall of the bushing protrudes into the accommodating cavity to form the support structure. Along the circumference of the stator core, the size of the accommodating cavity is larger than the size of the winding, and another portion of the inner wall of the bushing is spaced from the winding to form the first oil groove.

[0011] Optionally, along the circumference of the stator core, the cross-sectional area of ​​the first oil groove gradually decreases from a side close to the winding to a side close to the inner wall of the bushing.

[0012] Optionally, a plurality of the support structures are arranged along the circumference of the bushing, and the first oil groove is formed between every two adjacent support structures.

[0013] Optionally, the support structure extends from one end to the other end of the bushing along the axial direction of the motor.

[0014] Optionally, a second oil groove is formed between the outer wall of the bushing and the inner wall of the stator tooth slot.

[0015] Optionally, a stop portion is provided at the end of the bushing; and a stop groove is provided on the energy storage ring assembly to cooperate with the stop portion in a limiting manner.

[0016] Optionally, the stop groove and the stop portion are clearance-matched.

[0017] Optionally, a third sealing structure is provided between the stop groove and the stop portion.

[0018] Optionally, the stop portion is limitedly engaged with the axial end face of the stator.

[0019] Optionally, the energy storage ring assembly includes a first energy storage ring and a second energy storage ring arranged coaxially; the first energy storage ring includes a first shielding portion extending along its axial direction and a second shielding portion extending along its radial direction, and the second energy storage ring includes a third shielding portion extending along its axial direction and a fourth shielding portion extending along its radial direction;

[0020] In the axial direction of the motor, the second shielding portion and the fourth shielding portion are arranged opposite to each other, and in the radial direction of the motor, the first shielding portion and the third shielding portion are arranged opposite to each other;

[0021] The first shielding portion, the second shielding portion, the third shielding portion and the fourth shielding portion surround and form the oil cavity; wherein the oil passage hole is circumferentially opened on the fourth shielding portion.

[0022] Optionally, the inner diameter of the third shielding portion matches the inner diameter of the stator.

[0023] Optionally, it also includes a first sealing structure and a second sealing structure coaxially arranged with the energy storage ring assembly; the first sealing structure and the second sealing structure are correspondingly arranged at the connection between the first shielding part and the fourth shielding part and at the connection between the second shielding part and the third shielding part.

[0024] Optionally, the first sealing structure includes a first sealing groove provided on an axial end surface of the first shielding portion or an axial end surface of the fourth shielding portion along the axial direction of the motor, wherein a first sealing ring is clamped in the first sealing groove;

[0025] The second sealing structure includes a second sealing groove opened on the axial end surface of the second shielding portion or the axial end surface of the third shielding portion along the axial direction of the motor, and a second sealing ring is clamped in the second sealing groove.

[0026] In a second aspect, an embodiment of the present disclosure provides a motor comprising the motor oil cooling structure as described above.

[0027] In a third aspect, an embodiment of the present disclosure provides an electric drive system, comprising the motor oil cooling structure or the motor as described above.

[0028] In a fourth aspect, an embodiment of the present disclosure provides a vehicle comprising the motor oil cooling structure or the motor or the electric drive system as described above.

[0029] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0030] The motor oil cooling structure provided by the embodiment of the present disclosure can form a first oil flow groove for directional transmission of cooling oil in each stator tooth slot through the setting of the bushing. The bushing is covered on the outer surface of the winding in the corresponding stator tooth slot to realize directional guidance of the cooling oil. The cooling oil flowing in the bushing can directly cool the winding in the stator tooth slot, thereby improving the cooling efficiency of the entire motor; through the setting of the energy storage ring assembly, not only can an oil cavity be formed to cool the end part of the winding extending out of the stator tooth slot, but also cooling oil can be provided for each first oil flow groove. That is, the cooling oil soaks and cools the end part of the winding extending out of the stator tooth slot from the oil cavity formed by the energy storage ring assembly, and then flows through the oil hole to the first oil flow groove in the bushing. In the process of flowing from one end to the other end of the bushing, the heat of the winding surface is taken away, thereby realizing cooling of the end part of the winding located outside the stator tooth slot and the part located inside the stator tooth slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without inventive work, including:

[0033] FIG1 is a cross-sectional view of a motor according to an embodiment of the present disclosure.

[0034] FIG2 is a schematic structural diagram of a motor according to an embodiment of the present disclosure.

[0035] FIG3 is a schematic structural diagram of the first energy storage ring in the motor oil cooling structure according to an embodiment of the present disclosure.

[0036] FIG4 is a schematic structural diagram of the second energy storage ring in the motor oil cooling structure according to an embodiment of the present disclosure.

[0037] FIG5 is a cross-sectional view of the motor oil cooling structure according to an embodiment of the present disclosure.

[0038] FIG6 is a cross-sectional view of the connection between the bushing and the stator core in the motor oil cooling structure according to an embodiment of the present disclosure.

[0039] FIG7 is a schematic structural diagram of the connection between the bushing and the second energy storage ring in the motor oil cooling structure according to an embodiment of the present disclosure.

[0040] FIG8 is a schematic structural diagram of the connection between the stop portion on the bushing and the second energy storage ring in the motor oil cooling structure according to an embodiment of the present disclosure.

[0041] FIG9 is a schematic structural diagram of a bushing in the motor oil cooling structure according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] The following describes embodiments of the present disclosure in more detail with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0043] The term "including" and its variations used in this document are open inclusions, 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 other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0044] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0045] The drive motor in new energy vehicles generates a lot of heat when working. The current common method of motor cooling is to cool the motor stator through cooling oil. The existing oil cooling structure can often only cool the stator core. The cooling oil is difficult to flow into the stator slot from the end face gap of the stator slot. Even if some cooling oil flows into the stator slot, it is easy to flow into the rotor mounting cavity at the opening of the stator slot. The end of the winding and the part located in the stator slot cannot be fully cooled by the cooling oil, which in turn affects the cooling and heat dissipation effect of the entire motor.

[0046] Based on this, this embodiment provides a motor oil cooling structure, a motor, an electric drive system, and a vehicle. Through the provision of a bushing, a first oil flow groove for directional transmission of cooling oil can be formed in each stator slot. The bushing is coated on the outer surface of the winding in the corresponding stator slot to achieve directional flow of the cooling oil. The cooling oil flowing in the bushing can directly cool the winding in the stator slot, thereby improving the cooling efficiency of the entire motor. Through the provision of an energy storage ring assembly, not only can an oil cavity be formed to cool the end portion of the winding extending from the stator slot, but cooling oil can also be provided to each first oil flow groove. In other words, the cooling oil soaks and cools the end portion of the winding extending from the stator slot from the oil cavity formed by the energy storage ring assembly, then flows through the oil hole to the first oil flow groove in the bushing. In the process of flowing from one end of the bushing to the other end, the heat of the winding surface is removed, thereby cooling the end portion of the winding located outside the stator slot and the portion located inside the stator slot. A detailed description of this is provided below through specific embodiments:

[0047] 1 to 9 , a motor oil cooling structure provided in this embodiment includes an energy storage ring assembly 1 and a plurality of bushings 2 arranged along the axial direction of the motor; the plurality of bushings 2 are arranged one-to-one in the stator tooth slots 311 on the stator core 31, and the bushings 2 are used to accommodate the windings 33 in the corresponding stator tooth slots 311 and form a first oil groove 211; the energy storage ring assembly 1 is coaxially arranged with the motor and is used to form an oil chamber 13 for accommodating the portion of the winding 33 extending out of the stator tooth slots 311, and the energy storage ring assembly 1 is provided with oil holes 14 arranged one-to-one in the stator tooth slots 311, and the oil chamber 13 is connected to the first oil groove 211 through the oil holes 14.

[0048] The motor oil cooling structure provided in this embodiment can form a first oil passage 211 for directional transmission of cooling oil in each stator tooth slot 311 through the arrangement of the bushing 2. The bushing 2 is coated on the outer surface of the winding 33 in the corresponding stator tooth slot 311 to achieve directional flow of the cooling oil. The cooling oil circulates in the bushing 2 and can directly cool the winding 33 in the stator tooth slot 311, thereby improving the cooling efficiency of the entire motor. By setting the energy storage ring assembly 1, not only can a cooling winding 33 extending out of the stator tooth slot be formed, but also the cooling oil 33 can be cooled. The oil cavity 13 at the end portion of 311 can also provide cooling oil for each first oil groove 211. That is to say, the cooling oil immerses and cools the end portion of the winding 33 extending out of the stator tooth slot 311 from the oil cavity 13 formed by the energy storage ring assembly 1, and then flows through the oil hole 14 and flows to the first oil groove 211 in the bushing 2. In the process of flowing from one end to the other end of the bushing 2, the heat on the surface of the winding 33 is taken away, thereby cooling the end portion of the winding 33 located outside the stator tooth slot 311 and the portion located inside the stator tooth slot 311.

[0049] Continuing with reference to Figures 6, 8 and 9, a support structure 22 is formed on the inner wall of the bushing 2, and the support structure 22 is offset against the winding 33 to form a first oil groove 211 between the inner wall of the bushing 2 and the winding 33; through the provision of the support structure 22, the winding 33 can be supported, thereby improving the stability and NVH performance of the entire motor.

[0050] In some embodiments, the bushing 2 has a cavity for accommodating the winding 33. A portion of the inner wall of the bushing 2 protrudes into the cavity to form a support structure 22. Along the circumference of the stator core 31, the cavity is larger than the winding 33. Another portion of the inner wall of the bushing 2 is separated from the winding 33 to form a first oil passage groove 211. On the one hand, the support structure 22 formed by the protrusion of a portion of the inner wall of the bushing 2 abuts the winding 33, allowing the support structure 22 to support the winding 33 and improve the stability and NVH performance of the entire motor. On the other hand, the support structure 22 uses its own protrusion to form the first oil passage groove 211, ensuring that the first oil passage groove 211 is unobstructed.

[0051] Specifically, the support structure 22 can form an oil-flowing gap between the outer surface of the winding 33 and the bushing 2. That is, the bushing 2 and the winding 33 are gap-fitted. The support structure 22 on the inner wall of the bushing 2 can fill part of the gap to realize the support of the bushing 2 for the winding 33. At the same time, part of the gap is also left to form a first oil-flowing groove 211 to ensure the circulation of cooling oil. When the bushing 2 is made of metal, the support structure 22 can be formed by stamping; the support structure 22 can also be fixed to the inner wall of the bushing 2 by other means such as welding.

[0052] In some embodiments, the cross-sectional area of ​​the first oil groove 211 gradually decreases along the circumference of the stator core 31 from the side close to the winding 33 to the side close to the inner wall of the bushing 2. This can improve the cooling effect of the cooling oil on the winding 33.

[0053] Specifically, the cross-sectional area of ​​the first oil groove 211 decreases from the location of the winding 33 toward the inner wall of the bushing 22 spaced apart from the winding 33 .

[0054] In some embodiments, there are multiple support structures 22 arranged along the circumference of the bushing 2, and a first oil groove 211 is formed between every two adjacent support structures 22; that is, by arranging the support structures 22 at intervals along the circumference, multiple first oil grooves 211 can be formed, thereby increasing the contact area between the cooling oil and the winding 33, and at the same time making the surface cooling of the winding 33 more uniform, avoiding local overheating of the winding 33.

[0055] In a further embodiment, the support structure 22 extends from one end of the bushing 2 to the other end along the axial direction of the motor; that is, the support structure 22 is a strip structure and has the same extension direction as the winding 33. Such a support structure 22 can also form a first oil groove 211 with the same extension direction as it, and the cooling oil flows through the first oil groove 211 at a faster speed, thereby improving the cooling efficiency of the winding 33.

[0056] Continuing with reference to Figure 6, a second oil groove 212 is formed between the outer wall of the bushing 2 and the inner wall of the stator tooth slot 311; wherein, when the support structure 22 is formed by stamping, the outer wall of the bushing 2 is recessed toward the winding 33 at the position of the support structure 22, thereby forming the second oil groove 212; through the provision of the second oil groove 212, the bushing 2 itself and the stator tooth slot 311 can be cooled, thereby indirectly cooling the winding 33, thereby further improving the cooling efficiency of the motor.

[0057] Continuing with reference to Figures 1, 8 and 9, a stop portion 23 is provided at the end of the bushing 2; a stop groove is provided on the energy storage ring assembly 1, which is limited by the stop portion 23; through the setting of the stop portion 23 and the stop groove, the energy storage ring assembly 1 and the bushing 2 can be positioned, and the axial position and radial position of the bushing 2 in the stator tooth slot 311 can be determined; wherein, the stop portion 23 can be an annular structure protruding outward at the end of the bushing 2, and the whole has a certain thickness in the extension direction of the bushing 2, so that it can withstand radial force and axial force within a certain range, ensuring that the bushing 2 can form a reliable and stable connection with the energy storage ring assembly 1 through the stop portion 23.

[0058] In some embodiments, the stop groove and the stop portion 23 are clearance-matched, thereby facilitating installation of the energy storage ring assembly 1 and the bushing 2 onto the stator core 31 and reducing the impact of production errors.

[0059] In some embodiments, a third sealing structure is provided between the stop groove and the stop portion 23; wherein, the third sealing structure can be an annular sealing structure located between the stop portion 23 and the stop groove, which cooperates with the shape of the gap between the stop portion 23 and the stop groove. After the stop portion 23 is snapped into the stop groove, the third sealing structure is pressed and the gap between the stop portion 23 and the stop groove is blocked at the same time; through the setting of the third sealing structure, it can ensure that the cooling oil flows smoothly from the oil chamber 13 into the bushing 2, and avoid the cooling oil from penetrating from the gap at the connection between the stop groove and the stop portion 23 to the surface of the stator core 31, affecting the cooling efficiency.

[0060] In some embodiments, the stopper portion 23 is engaged with the axial end face of the stator core 31; that is, the stopper portion 23 can be used to prevent the bushing 2 from being stuck in the stator tooth slot 311, and can also facilitate the quick installation of the bushing 2.

[0061] In some embodiments, the energy storage ring assembly 1 includes a first energy storage ring 11 and a second energy storage ring 12 arranged coaxially; the first energy storage ring 11 includes a first shielding portion 111 extending along its axial direction and a second shielding portion 112 extending along its radial direction, wherein the first shielding portion 111 and the second shielding portion 112 can be integrally formed or fixedly connected, and the second energy storage ring 12 includes a third shielding portion 121 extending along its axial direction and a fourth shielding portion 122 extending along its radial direction, wherein the third shielding portion 121 and the fourth shielding portion 122 can be integrally formed or fixedly connected; in the axial direction of the motor, the second shielding portion 112 and the fourth shielding portion 122 are arranged opposite to each other, and in the radial direction of the motor, the first shielding portion 111 and the third shielding portion 121 are arranged opposite to each other; the first shielding portion 111, the third shielding portion 121 and the fourth shielding portion 122 are arranged opposite to each other The second shielding part 112, the third shielding part 121 and the fourth shielding part 122 are surrounded to form an oil chamber 13; wherein, the oil hole 14 is opened on the fourth shielding part 122 along the circumferential direction; in some other embodiments, the first shielding part 111 and the third shielding part 121 can be connected to the second shielding part 112 to form the first energy storage ring 11, or the first shielding part 111 and the third shielding part 121 can be connected to the fourth shielding part 122 to form the second energy storage ring 12, or the first shielding part 111 can be connected to the fourth shielding part 122 to form the second energy storage ring 12, and the third shielding part 121 can be connected to the second shielding part 112 to form the first energy storage ring 11; as long as the axial compression of the first energy storage ring 11 and the second energy storage ring 12 can be facilitated to form a closed oil chamber 13, it will be sufficient.

[0062] Continuing with reference to FIG1 , the inner diameter of the third shielding portion 121 matches the inner diameter of the stator core 31 ; that is, the energy storage ring assembly 1 does not interfere with the rotor mounting cavity 32 in the axial direction, thereby enabling the energy storage ring assembly 1 to not affect the normal installation of the stator core 31 and the rotor.

[0063] Continuing with reference to Figures 1, 3, 4 and 7, the motor oil cooling structure also includes a first sealing structure 41 and a second sealing structure 42 coaxially arranged with the energy storage ring assembly 1; the first sealing structure 41 and the second sealing structure 42 are correspondingly arranged at the connection between the first shielding portion 111 and the fourth shielding portion 122 and the connection between the second shielding portion 112 and the third shielding portion 121; the arrangement of the first sealing structure 41 and the second sealing structure 42 can improve the sealing performance of the energy storage ring assembly 1, specifically, can improve the sealing performance of the oil cavity 13 formed by splicing the first energy storage ring 11 and the second energy storage ring 12; ensure that the cooling oil can smoothly enter the first oil groove 211 of the bushing 2.

[0064] In a further embodiment, the first sealing structure 41 includes a first sealing groove 411 opened on the axial end face of the first blocking portion 111 or the axial end face of the fourth blocking portion 122 along the axial direction of the motor, and a first sealing ring 412 is clamped in the first sealing groove 411; the second sealing structure 42 includes a second sealing groove 421 opened on the axial end face of the second blocking portion 112 or the axial end face of the third blocking portion 121 along the axial direction of the motor, and a second sealing ring 422 is clamped in the second sealing groove 421; such an arrangement can ensure that when the first energy storage ring 11 is pressed toward the second energy storage ring 12 along its axial direction, a clamping force in the same direction can be provided to the first sealing ring 412 and the second sealing ring 422, and the direction of the clamping force is parallel to the opening direction of the first sealing groove 411 and the second sealing groove 421; thereby, it can ensure that the connection between the first energy storage ring 11 and the second energy storage ring 12 is sealed more tightly and firmly.

[0065] In a second aspect, an embodiment of the present disclosure provides a motor comprising the motor oil cooling structure as described above.

[0066] The specific implementation method and implementation principle are the same as those in the above embodiment, and can bring the same or similar technical effects, which will not be described here one by one. For details, please refer to the description of the above motor oil cooling structure embodiment.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0068] The foregoing are merely specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not to be limited to the embodiments described herein, but is to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A motor oil cooling structure, comprising an energy storage ring assembly and a plurality of bushings arranged along the axis direction of the motor; The plurality of bushings are correspondingly arranged in the stator tooth grooves on the stator core, and the bushings are used to accommodate the windings in the corresponding stator tooth grooves and form a first oil passage groove; The energy storage ring assembly is coaxially arranged with the motor and is used to form an oil cavity for accommodating the part of the winding extending out of the stator tooth groove. Oil passage holes corresponding to the stator tooth grooves one by one are formed on the energy storage ring assembly, and the oil cavity is communicated with the first oil passage groove through the oil passage holes.

2. The motor oil cooling structure according to claim 1, wherein a support structure is formed on the inner wall of the bushing, and the support structure abuts against the winding to form the first oil passage groove between the inner wall of the bushing and the winding.

3. The motor oil cooling structure according to claim 2, wherein the bushing has an accommodation cavity for accommodating the winding, a part of the inner wall of the bushing protrudes into the accommodation cavity to form the support structure. Along the circumferential direction of the stator core, the size of the accommodation cavity is larger than that of the winding, and another part of the inner wall of the bushing is spaced from the winding to form the first oil passage groove.

4. The motor oil cooling structure according to claim 3, along the circumferential direction of the stator core, from the side close to the winding to the side close to the inner wall of the bushing, the cross-sectional area of the first oil passage groove gradually decreases.

5. The motor oil cooling structure according to any one of claims 2-4, wherein a plurality of the support structures are arranged along the circumferential direction of the bushing, and the first oil passage groove is formed between every two adjacent support structures.

6. The motor oil cooling structure according to any one of claims 2-5, wherein the support structure extends from one end of the bushing to the other end along the axis direction of the motor.

7. The motor oil cooling structure according to any one of claims 1-6, wherein a second oil passage groove is formed between the outer wall of the bushing and the inner wall of the stator tooth groove.

8. The motor oil cooling structure according to any one of claims 1-7, wherein a stop portion is provided at the end of the bushing; a stop groove for limiting and cooperating with the stop portion is formed on the energy storage ring assembly.

9. The motor oil cooling structure according to claim 8, wherein the stop groove and the stop portion are in clearance fit.

10. The motor oil cooling structure according to claim 8 or 9, wherein a third sealing structure is provided between the stop groove and the stop portion.

11. The motor oil cooling structure according to any one of claims 8-10, wherein the stop portion is in limiting cooperation with the axial end face of the stator core.

12. The motor oil cooling structure according to any one of claims 1-11, wherein the energy storage ring assembly comprises a first energy storage ring and a second energy storage ring arranged coaxially; the first energy storage ring comprises a first shielding portion extending along its axis direction and a second shielding portion extending along its radial direction, and the second energy storage ring comprises a third shielding portion extending along its axis direction and a fourth shielding portion extending along its radial direction; In the axial direction of the axis of the motor, the second shielding portion and the fourth shielding portion are oppositely arranged, and in the radial direction of the motor, the first shielding portion and the third shielding portion are oppositely arranged; The first shielding portion, the second shielding portion, the third shielding portion, and the fourth shielding portion surround and form the oil cavity; wherein, The oil passing hole is circumferentially formed in the fourth shielding portion.

13. The motor oil cooling structure according to claim 12, wherein the inner diameter of the third shielding portion matches the inner diameter of the stator core.

14. The motor oil cooling structure according to claim 12 or 13, further comprising a first sealing structure and a second sealing structure coaxially arranged with the energy storage ring assembly; the first sealing structure and the second sealing structure are correspondingly arranged at the connection between the first shielding portion and the fourth shielding portion and the connection between the second shielding portion and the third shielding portion.

15. The motor oil cooling structure according to any one of claims 12-14, wherein the first sealing structure includes a first sealing groove axially formed in the axial end face of the first shielding portion or the axial end face of the fourth shielding portion in the axial direction of the motor, and a first sealing ring is clamped in the first sealing groove; The second sealing structure includes a second sealing groove axially formed in the axial end face of the second shielding portion or the axial end face of the third shielding portion in the axial direction of the motor, and a second sealing ring is clamped in the second sealing groove.

16. A motor, comprising the motor oil cooling structure according to any one of claims 1-15.

17. An electric drive system, comprising the motor oil cooling structure according to any one of claims 1-15, or the motor according to claim 16.

18. A vehicle, comprising the motor oil cooling structure according to any one of claims 1-15, or the motor according to claim 16, or the electric drive system according to claim 17.

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