Oil cooling structure, motor and vehicle

Abstract

The utility model provides an oil cooling structure, a motor and a vehicle, and belongs to the technical field of motor cooling structures, according to the oil cooling structure provided by the utility model, an oil inlet iron core group is arranged between a side iron core group and a middle iron core group to form a cooling oil groove, so that cooling oil is effectively introduced, and through the combined action of an axial oil duct and a guide oil duct, the oil cooling effect is improved. According to the structure, the iron core and the stator winding end are effectively cooled, it is ensured that cooling oil evenly acts on all components to form the cooling effect, the running reliability of the motor is improved, the structure is small in occupied space, the components are simple, additional arrangement of an auxiliary oil injection component and a sealing structure is not needed, and overall layout and lightweight design of a vehicle are facilitated; the oil passing holes of the rectangular structure are adopted, the guide oil channels with the inclined trend are formed among different iron core sheets by means of the characteristic that the long sides of the oil passing holes are large in size, the cooling effect on the end portion of a stator winding is achieved, structural layout is simplified, the structural size is reduced, and light-weight design can be achieved easily.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor cooling structure, and more specifically, it relates to an oil cooling structure, a motor, and a vehicle. Background Technology

[0002] With the rapid development of electric vehicle technology, the performance and reliability requirements of motors, as core components, are increasing. Oil-cooled motors, as a novel cooling technology, offer advantages such as efficient heat dissipation and increased power density, and are gradually becoming a research and application hotspot.

[0003] Currently, oil-cooled motors primarily employ the following structure for heat dissipation: slots are cut into the outer circumference of the core to form cooling oil channels. The cooling medium first flows in through the oil inlet and along the axis to the front oil chamber, where it is sprayed onto the stator winding ends via a front spray ring. The cooling medium then flows through internal oil channels in the core to the rear oil chamber and is sprayed onto the stator winding ends again via a rear spray ring. This type of oil-cooling structure uses core cooling combined with winding end cooling, requiring multiple components (such as spray rings and sealing rings) to achieve oil spray cooling. The design of the cooling circuit must consider the oil flow velocity, flow rate, and flow path. Furthermore, the auxiliary oil-cooling spray components are made of special materials, resulting in high costs. Additionally, the circulation system requires ongoing maintenance, significantly increasing equipment costs. Utility Model Content

[0004] The purpose of this invention is to provide an oil-cooled structure, motor, and vehicle that can effectively cool the iron core and stator winding ends, improve the heat dissipation efficiency of the motor, and reduce the manufacturing cost of the structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an oil-cooling structure is provided, including a central core assembly and two side core assemblies disposed within a motor housing. The two side core assemblies are located on opposite sides of the central core assembly. An oil inlet core assembly is provided between one of the side core assemblies and the central core assembly. A cooling oil groove is formed on the outer periphery of the oil inlet core assembly between the side core assembly and the central core assembly. The cooling oil groove is connected to the motor oil inlet. The central core assembly is provided with several axially penetrating oil channels that are connected to the cooling oil groove. The side core assemblies are provided with guide oil channels that are connected to the axial oil channels or the cooling oil groove. The outer end of the guide oil channel extends obliquely toward the axial side of the side core assembly to guide the cooling oil sprayed to the end of the stator winding.

[0006] In one possible implementation, the side core assembly includes several stacked side core plates, each side core plate having an oil passage hole, and the oil passage holes on the several side core plates are connected in sequence to form a guide oil channel.

[0007] In some embodiments, the main shaft of the oil passage hole is arranged parallel to the main shaft of the side core lamination, and the axial projections of the corresponding two oil passage holes on two adjacent side core laminations at least partially overlap.

[0008] In some embodiments, the side core laminations include a connecting core lamination, an oil collecting core lamination, and an oil discharging core lamination arranged sequentially. The oil passage includes a connecting hole disposed on the connecting core lamination and connected to an axial oil passage or cooling oil groove, an oil collecting hole disposed on the oil collecting core lamination, and an oil discharging hole disposed on the oil discharging core lamination. The oil collecting hole is an arc-shaped elongated hole extending circumferentially along the oil collecting core lamination. The same oil collecting hole is connected to multiple connecting holes, and the same oil collecting hole is also connected to multiple oil discharging holes.

[0009] In some embodiments, there are several oil outlet core laminations. From the side closest to the oil collection core lamination to the side furthest from the oil collection core lamination, the distance between the oil outlet hole and the axis of the oil outlet core lamination gradually decreases. The number of oil outlet holes on each oil outlet core lamination is equal and less than the number of connecting holes.

[0010] In one possible implementation, the outer peripheral walls of both the side core assembly and the central core assembly are interference-fitted with the inner wall of the motor housing, and the outer diameters of both the side core assembly and the central core assembly are larger than the outer diameter of the oil inlet core assembly.

[0011] In one possible implementation, the core assembly includes several stacked core sheets, each core sheet having circumferentially spaced oil passages located near the outer periphery of the core sheet, with the oil passages of two adjacent core sheets corresponding to each other and communicating with each other.

[0012] In one possible implementation, the oil inlet core assembly includes several stacked oil inlet core plates, all of which have the same outer diameter, and the cooling oil groove is located on the outer periphery of the oil inlet core plates.

[0013] Compared with the prior art, the oil-cooling structure provided in this application embodiment forms a cooling oil groove by setting an oil inlet core assembly between the side core assembly and the middle core assembly, thereby effectively introducing cooling oil. Then, through the combined action of axial oil passages and guide oil passages, effective cooling of the core and stator winding ends is achieved, ensuring that the cooling oil is evenly applied to each component to form a cooling effect, improving the reliability of motor operation. The above structure occupies little space, has simple components, and does not require additional auxiliary oil injection components and sealing structures, which is beneficial to the overall layout and lightweight design of the vehicle.

[0014] This utility model also provides an electric motor, which includes an oil-cooled structure. The oil inlet core assembly of the electric motor guides the cooling oil entering through the motor oil inlet to the axial oil passage and the guide oil passage. The guide oil passage then delivers the cooling oil to the end of the stator winding, achieving synchronous cooling of the core and the end of the stator winding, which is beneficial for achieving a lightweight design.

[0015] This utility model also provides a vehicle, which includes an electric motor. The electric motor of the vehicle has the advantages of small structural size and good heat dissipation, which facilitates lightweight design and reduces equipment costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A partial exploded structural diagram of the oil-cooling structure provided in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional view of the oil cooling structure provided in an embodiment of the present utility model;

[0019] Figure 3 This is an embodiment of the present utility model. Figure 2 A partially enlarged structural diagram of section I;

[0020] Figure 4 This is a schematic diagram of the main sectional view of the motor provided in an embodiment of the present utility model;

[0021] Figure 5 A partial explosion diagram of the oil-cooled structure according to another embodiment of this utility model.

[0022] The following are the labeling elements in the figure:

[0023] 1. Core assembly; 11. Axial oil passage; 12. Core lamination; 13. Oil passage hole; 2. Side core assembly; 21. Guide oil passage; 22. Side core lamination; 221. Connecting core lamination; 222. Oil collecting core lamination; 223. Oil outlet core lamination; 231. Connecting hole; 232. Oil collecting hole; 233. Oil outlet hole; 23. Through hole; 3. Oil inlet core assembly; 31. Cooling oil groove; 41. Motor oil inlet; 42. Stator winding end. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] In the claims, description, and accompanying drawings of this utility model, the terms "front" and "rear" refer to the front-rear direction of the vehicle body, "left" and "right" refer to the left-right direction of the vehicle body, and "upper" and "lower" refer to the vertical direction of the vehicle body. The term "inner" refers to the direction towards the central axis of the vehicle body, and the term "outer" refers to the direction away from the central axis of the vehicle body, wherein the central axis of the vehicle body is parallel to the front-rear direction of the vehicle body. Other directional terms, unless otherwise explicitly defined, such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "clockwise," "counterclockwise," "high," and "low," are used to indicate orientation or positional relationships based on the orientation and positional relationships shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0026] Please refer to the following: Figures 1 to 5 The oil-cooling structure, motor, and vehicle provided by this utility model will now be described. The oil-cooling structure includes a central core assembly 1 and two side core assemblies 2, which are correspondingly arranged on both sides of the central core assembly 1. An oil inlet core assembly 3 is provided between one of the side core assemblies 2 and the central core assembly 1. A cooling oil groove 31 is formed on the outer periphery of the oil inlet core assembly 3, which is located between the side core assembly 2 and the central core assembly 1. The cooling oil groove 31 is connected to the motor oil inlet 41 and is used to receive the cooling oil entering from the motor oil inlet 41. The central core assembly 1 is provided with a plurality of axial oil passages 11 that are axially connected and connected to the cooling oil groove 31. The side core assembly 2 is provided with guide oil passages 21 that are connected to the axial oil passages 11 or the cooling oil groove 31. The outer end of the guide oil passage 21 extends obliquely towards the axial center of the side core assembly 2 and is used to guide the cooling oil to be sprayed to the stator winding end 42.

[0027] Compared with the prior art, the oil cooling structure provided in this embodiment forms a cooling oil groove 31 by setting an oil inlet core group 3 between the side core group 2 and the middle core group 1, thereby effectively introducing cooling oil. Then, through the combined action of the axial oil passage 11 and the guide oil passage 21, the cooling oil is ensured to act evenly on each component to form a cooling effect, thereby effectively cooling the core and the stator winding end 42, improving the reliability of motor operation. The above structure occupies little space, has simple components, and does not require additional oil injection components and sealing structures, which is beneficial to the overall layout and lightweight design of the vehicle.

[0028] In this embodiment, the cooling oil entering through the motor oil inlet 41 enters the guide oil channel 21 on one side directly through the cooling oil groove 31, or enters the guide oil channel 21 on the other side through the axial oil channel 11, and finally acts on the stator winding end 42, so as to achieve sufficient cooling of different positions inside the motor. Good cooling effect can be achieved without setting redundant oil spraying structure and sealing structure.

[0029] Among some possible implementations, the aforementioned characteristic side core group 2 adopts, as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The side core assembly 2 includes several stacked side core pieces 22. Each side core piece 22 is provided with an oil passage hole 23. The oil passage holes 23 on the several side core pieces 22 are connected in sequence to form a guide oil channel 21.

[0030] In this embodiment, multiple side core plates 22 are stacked sequentially to form a side core group 2. The oil passage holes 23 on the side core plates 22 are sequentially connected to form a guide oil channel 21. The outer end of the guide oil channel 21 extends obliquely toward the axis of the side core group 2. That is, the closer the oil passage hole 23 on the side core plate 22 is to the central axis of the side core plate 22, the closer it is to the stator winding end 42. This allows the cooling oil to be effectively sprayed onto the stator winding end 42, thereby achieving effective cooling of the stator winding end 42.

[0031] Specifically, each side core lamination 22 can be provided with multiple oil passage holes 23, which form multiple guide oil channels 21. The multiple guide oil channels 21 extend obliquely towards the axial side of the side core assembly 2, forming synchronous cooling of different positions of the stator winding end 42. The above structure can not only meet the cooling of the core itself, but also synchronously cool the stator winding end 42, forming a uniform cooling effect on the internal components of the motor.

[0032] In some embodiments, the aforementioned oil passage 23 can be adopted as follows: Figure 2 and Figure 3 The structure shown. See also Figure 2 and Figure 3 The main shaft of the oil passage hole 23 is set parallel to the main shaft of the side core piece 22, and the axial projections of the corresponding two oil passage holes 23 on two adjacent side core pieces 22 at least partially overlap.

[0033] In this embodiment, the main shaft of the oil passage 23 is arranged along the main shaft of the side core plate 22. This method facilitates the processing and forming of the oil passage 23. The axial projections of the oil passages 23 on two adjacent side core plates 22 at least partially overlap, ensuring effective communication between two adjacent oil passages 23. This allows the oil passages 23 of multiple side core plates 22 to be connected sequentially to form an oil channel 21 that extends obliquely towards the axis. This facilitates the cooling oil to flow out from the oil channel 21 and accurately act on the stator winding end 42, thus effectively cooling the stator winding end 42.

[0034] Specifically, the distance between the oil passage hole 23 on the outer side core lamination 22 and the axis of the side core lamination 22 is smaller than the distance between the oil passage hole 23 on the inner side core lamination 22 and the axis of the side core lamination 22. To ensure that the guide oil passage 21 tends to tilt towards the axis of the central core assembly 1, the distance between the oil passage hole 23 on different side core laminations 22 and the central axis of the side core lamination 22 should exhibit a certain degree of variation when arranging the oil passage holes 23. The side of the side core lamination 22 closest to the central core assembly 1 is defined as the inner side, and the side farther away from the central core assembly 1 is defined as the outer side. The oil passage hole 23 on the inner side of the side core lamination 22 is farther away from the main shaft of the side core lamination 22 than the oil passage hole 23 on the outer side of the side core lamination 22. This causes the guide oil channel 21 to extend inclinedly towards the axis of the side core assembly 2 from the inner side to the outer side, which satisfies the subsequent spray cooling of the stator winding end 42, improves the cooling efficiency, and ensures the cooling quality.

[0035] In some embodiments, the aforementioned feature-side core lamination 22 can be adopted as follows: Figure 1 The structure shown. See also Figure 1 The side core plate 22 includes a connecting core plate 221, an oil collecting core plate 222, and an oil discharging core plate 223 arranged sequentially. The oil passage 23 includes a connecting hole 231 disposed on the connecting core plate 221 and connected to the axial oil passage 11 or the cooling oil groove 31, an oil collecting hole 232 disposed on the oil collecting core plate 222, and an oil discharging hole 233 disposed on the oil discharging core plate 223. The oil collecting hole 232 is an arc-shaped elongated hole extending circumferentially along the oil collecting core plate 222. The same oil collecting hole 232 is connected to multiple connecting holes 231, and the same oil collecting hole 232 is also connected to multiple oil discharging holes 233.

[0036] In this embodiment, the side core lamination 22 is composed of three different laminations: a connecting core lamination 221, an oil collecting core lamination 222, and an oil discharging core lamination 223. These three laminations are manufactured using different molds, with the connecting hole 231, oil collecting hole 232, and oil discharging hole 233 each formed separately. The distances from the connecting hole 231 to the axis of the connecting core lamination 221, from the oil collecting hole 232 to the axis of the oil collecting core lamination 222, and from the oil discharging hole 233 to the axis of the oil discharging core lamination 223 gradually decrease. This causes the cooling oil to converge towards the outer end axis of the side core lamination 22, facilitating effective cooling of the stator winding end 42.

[0037] Among them, the oil collecting core lamination 222 located in the middle forms an oil collecting function by setting oil collecting holes 232, which facilitates the formation of oil pressure, not only meeting the cooling function of the stator winding end 42, but also facilitating the oil circuit circulation requirements.

[0038] It should be noted that the structures of the two side core groups 2 located at both ends are completely identical, and they can correspond one-to-one with the stator winding ends 42 at both ends, so as to achieve sufficient cooling of the stator winding ends 42.

[0039] Among some possible implementations, see [link to relevant documentation]. Figure 1 There are several oil outlet core laminations 223. From the side closest to the oil collection core lamination 222 to the side away from the oil collection core lamination 222, the distance between the oil outlet hole 233 and the axis of the oil outlet core lamination 223 gradually decreases. The number of oil outlet holes 233 on each oil outlet core lamination 223 is equal and is less than the number of connecting holes 231.

[0040] In this embodiment, multiple oil outlet core laminations 223 are arranged sequentially. The distance between the oil outlet hole 233 and the axis of the oil outlet core lamination 223 of each oil outlet core lamination 223 is not the same, and it is still necessary to satisfy the effect of tilting towards the axis of the oil outlet core lamination 223.

[0041] Meanwhile, the number of connecting holes 231 on the connecting core lamination 221 can be kept the same as the number of axial oil passages 11 on the central core assembly 1, and the axial direction is one-to-one. This makes it easy for the cooling oil in the cooling oil tank 31 to diffuse symmetrically and evenly into the central core assembly 1 and the side core assembly 2, so as to meet the cooling effect of cooling the ends 42 of the two stator windings on both sides, and ensure the consistency of the cooling effect.

[0042] As an example, please refer to Figure 5The number of oil passage holes 23 on the multiple side core laminations 22 is consistent, forming multiple guide oil channels 21. The oil passage holes 23 are rectangular holes, with their long sides parallel to the radial direction of the side core laminations 22. The rectangular shape of the oil passage holes 23 allows for the guidance of cooling oil by utilizing their longer long side dimension. This facilitates the formation of through-holes between different core laminations and a tendency to slope towards the axis of the core laminations, thereby forming guide oil channels 21 to meet the cooling function of the stator winding ends 42.

[0043] Oil holes 23 on the same side core lamination 22 are spaced apart along the circumference of the side core lamination 22, so that different positions of the side core assembly 2 are effectively cooled. At the same time, multiple guide oil channels 21 are used to form uniform cooling of different positions on the outer periphery of the stator winding end 42, forming a comprehensive cooling effect.

[0044] Among some possible implementations, see [link to relevant documentation]. Figure 4 The outer peripheral walls of both the side core assembly 2 and the middle core assembly 1 are interference-fitted with the inner wall of the motor housing, and the outer diameters of both the side core assembly 2 and the middle core assembly 1 are larger than the outer diameter of the oil inlet core assembly 3.

[0045] In this embodiment, the outer diameters of the side core assembly 2 and the middle core assembly 1 are equal, and their outer peripheral walls are both interference-fitted with the inner wall of the motor housing. The outer edges of the side core assembly 2 and the middle core assembly 1 can effectively abut against the inner wall of the motor housing, forming an interference fit. Based on this, a closed cooling oil groove 31 is formed by the end faces of the side core assembly 2 and the middle core assembly 1, the outer peripheral wall of the oil inlet core assembly 3, and the inner wall of the motor housing. The cooling oil groove 31 extends circumferentially, which can convey the motor oil inlet 41 circumferentially to form a dispersion effect. Then, the cooling oil is smoothly dispersed into multiple adjacent guide oil channels 21 and multiple axial oil channels 11, ultimately forming effective spray cooling of different positions on the outer periphery of the stator winding end 42.

[0046] Among some possible implementations, the core assembly 1 of the above features adopts, for example... Figure 1 The structure shown. See also Figure 1 The core assembly 1 includes several stacked core sheets 12. Each core sheet 12 is provided with circumferentially spaced oil passage holes 13. The oil passage holes 13 are located near the outer peripheral edge of the core sheet 12, and the oil passage holes 13 of two adjacent core sheets 12 are connected one-to-one.

[0047] In this embodiment, the core assembly 1 includes multiple stacked core sheets 12. The outer diameter of the core sheets 12 is consistent, and the oil passage holes 13 of two adjacent core sheets 12 are interconnected to form an axial oil passage 11. The axial oil passage 11 delivers cooling oil to the guide oil passage 21 away from the cooling oil tank 31, so that the cooling oil can be sprayed outward to the stator winding end 42 to achieve effective cooling of the stator winding end 42.

[0048] Among some possible implementations, the above-mentioned features of the oil inlet core assembly 3 are adopted as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The oil inlet core assembly 3 includes several stacked oil inlet core plates, all of which have the same outer diameter, and the cooling oil tank 31 is located on the outer periphery of the oil inlet core plates.

[0049] In this embodiment, the oil inlet core assembly 3 includes multiple stacked oil inlet core pieces. The outer diameter of the oil inlet core pieces is consistent and there are no other holes. The cooling oil tank 31 is formed by the outer peripheral wall, the inner peripheral wall of the motor housing, and the adjacent end faces of the middle core assembly 1 and the side core assembly 2, so that the cooling oil tank 31 has sufficient capacity to facilitate the subsequent effective dispersion of cooling oil.

[0050] Specifically, the outer diameter of the oil inlet core assembly 3 is smaller than the distance between the oil passage hole 13 and the axis of the central core piece 12, so that the axial oil passage 11 can be effectively connected with the cooling oil tank 31, facilitating the smooth delivery of cooling oil from the cooling oil tank 31 to the side core assembly 2 on the side away from the motor oil inlet 41. The outer diameter of the oil inlet core assembly 3 is smaller than the distance between the oil passage hole 23 and the axis of the side core piece 22, so that the guide oil passage 21 can be effectively connected with the cooling oil tank 31, facilitating the smooth delivery of cooling oil from the cooling oil tank 31 to the stator winding end 42.

[0051] Based on the same inventive concept, this application also provides an electric motor, which includes an oil-cooled structure. The oil inlet core assembly 3 of the electric motor guides the cooling oil entering through the motor oil inlet 41 to the axial oil passage 11 and the guide oil passage 21. The guide oil passage 21 is used to deliver the cooling oil to the stator winding end 42, thereby achieving synchronous cooling of the core and the stator winding end 42. This facilitates the lightweight design of the structure and makes it suitable for use in new energy vehicles.

[0052] Based on the same inventive concept, this application also provides a vehicle, which includes a motor. The motor of the vehicle has the advantages of small structural size and good heat dissipation, which facilitates lightweight design and reduces equipment costs.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oil-cooled structure, characterized in that, The device includes a central core assembly (1) and two side core assemblies (2) disposed within the motor housing. The two side core assemblies (2) are located on opposite sides of the central core assembly (1). An oil inlet core assembly (3) is provided between one of the side core assemblies (2) and the central core assembly (1). A cooling oil groove (31) is formed on the outer periphery of the oil inlet core assembly (3) between the side core assembly (2) and the central core assembly (1). The cooling oil groove (31) and the... The motor oil inlet (41) is connected. The central iron core assembly (1) is provided with several axially penetrating oil channels (11) that are connected to the cooling oil groove (31). The side iron core assembly (2) is provided with a guide oil channel (21) that is connected to the axial oil channel (11) or the cooling oil groove (31). The outer end of the guide oil channel (21) extends obliquely toward the axial side of the side iron core assembly (2) to guide the cooling oil to spray to the stator winding end (42).

2. The oil-cooled structure as described in claim 1, characterized in that, The side core assembly (2) includes a number of stacked side core plates (22), each of which has an oil passage hole (23). The oil passage holes (23) on the several side core plates (22) are connected in sequence to form the guide oil channel (21).

3. The oil-cooled structure as described in claim 2, characterized in that, The main axis of the oil passage hole (23) is parallel to the main axis of the side core piece (22), and the axial projections of the corresponding two oil passage holes (23) on two adjacent side core pieces (22) at least partially overlap.

4. The oil-cooled structure as described in claim 3, characterized in that, The side core plate (22) includes a connecting core plate (221), an oil collecting core plate (222), and an oil outlet core plate (223) arranged sequentially. The oil passage (23) includes a connecting hole (231) disposed on the connecting core plate (221) and connected to the axial oil passage (11) or the cooling oil groove (31), an oil collecting hole (232) disposed on the oil collecting core plate (222), and an oil outlet hole (233) disposed on the oil outlet core plate (223). The oil collecting hole (232) is an arc-shaped elongated hole extending circumferentially along the oil collecting core plate (222). The same oil collecting hole (232) is connected to multiple connecting holes (231), and the same oil collecting hole (232) is also connected to multiple oil outlet holes (233).

5. The oil-cooled structure as described in claim 4, characterized in that, The oil outlet core laminations (223) are provided in a plurality of manner. From the side closest to the oil collection core laminations (222) to the side furthest from the oil collection core laminations (222), the distance between the oil outlet holes (233) and the axis of the oil outlet core laminations (223) gradually decreases. The number of oil outlet holes (233) on each oil outlet core lamination (223) is equal and is less than the number of the connecting holes (231).

6. The oil-cooled structure as described in claim 5, characterized in that, The outer peripheral walls of the side core assembly (2) and the middle core assembly (1) are both interference-fitted with the inner wall of the motor housing, and the outer diameters of the side core assembly (2) and the middle core assembly (1) are both larger than the outer diameter of the oil inlet core assembly (3).

7. The oil-cooled structure as described in any one of claims 1-5, characterized in that, The core assembly (1) includes several stacked core pieces (12). Each core piece (12) is provided with circumferentially spaced oil passage holes (13). The oil passage holes (13) are located near the outer peripheral edge of the core piece (12), and the oil passage holes (13) of two adjacent core pieces (12) are connected one-to-one.

8. The oil-cooled structure as described in any one of claims 1-5, characterized in that, The oil inlet core assembly (3) includes several stacked oil inlet core pieces, all of which have the same outer diameter, and the cooling oil tank (31) is located on the outer periphery of the oil inlet core pieces.

9. An electric motor, characterized in that, Includes the oil-cooled structure according to any one of claims 1-8.

10. A vehicle, characterized in that, Includes the motor as described in claim 9.

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