CN221009914U

CN221009914U - Motor and vehicle

Info

Publication number: CN221009914U
Application number: CN202322761451.4U
Authority: CN
Inventors: 孙振宇; 黄兴福; 杨悦思
Original assignee: Human Horizons Shanghai New Energy Drive Technology Co Ltd
Current assignee: Human Horizons Shanghai New Energy Drive Technology Co Ltd
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-05-24
Anticipated expiration: 2033-10-13

Abstract

The embodiment of the application provides a motor and a vehicle, wherein the motor comprises: a housing defining a cavity therein and having an opening at an end in communication with the cavity; the end cover is arranged at the opening and is provided with a through mounting cavity, the mounting cavity is used for mounting a bearing, the inner wall surface of the mounting cavity is provided with an annular boss protruding towards the inner side, and an oil storage tank is defined between the annular boss and the bearing; the end cover is also provided with an oil inlet and an oil outlet which are communicated with the oil storage tank; in the height direction of the motor, the position of the oil outlet is higher than the position of the oil inlet and lower than the lowest point of the inner side edge of the annular boss. According to the technology of the application, lubrication of the bearing of the motor is realized, the working reliability of the bearing is ensured, and other structures are not required to be arranged on the end cover, so that the structure of the motor is simplified, and the working stability and reliability of the motor are improved.

Description

Motor and vehicle

Technical Field

The application relates to the technical field of motors, in particular to a motor and a vehicle.

Background

Currently, electric drive assemblies are developing with a trend of high power density, integrated full oil cooling. In the electric drive assembly in the related art, a lubricating oil circuit of a bearing is generally complex in structure and occupies a large space, and the working performance of other peripheral components can be influenced by a single leakage.

Disclosure of utility model

The embodiment of the application provides a motor and a vehicle, which are used for solving or relieving one or more technical problems in the prior art.

As an aspect of an embodiment of the present application, an embodiment of the present application provides an electric motor including: a housing defining a cavity therein and having an opening at an end in communication with the cavity; the end cover is arranged at the opening and is provided with a through mounting cavity, the mounting cavity is used for mounting a bearing, the inner wall surface of the mounting cavity is provided with an annular boss protruding towards the inner side, and an oil storage tank is defined between the annular boss and the bearing; the end cover is also provided with an oil inlet and an oil outlet which are communicated with the oil storage tank; in the height direction of the motor, the position of the oil outlet is higher than the position of the oil inlet and lower than the lowest point of the inner side edge of the annular boss.

In one embodiment, the cross-sectional shape of the inner edge of the annular boss includes a straight line segment and an arc segment, the straight line segment is arranged along the horizontal direction, and the arc segment is located on the upper side of the straight line segment and two ends of the arc segment are respectively connected with two ends of the straight line segment.

In one embodiment, a stop wall is formed on a side of the annular boss adjacent to the bearing, and an oil reservoir is defined between the stop wall and an end surface of the bearing.

In one embodiment, a washer is disposed within the mounting cavity and the bearing is embedded in the washer.

In one embodiment, a bearing spacer is provided on a side of the bearing adjacent the sump.

In one embodiment, the wall of the housing is provided with a first cooling flow passage extending to an end of the housing, the motor further comprising:

The cover plate is arranged on one side, far away from the shell, of the end cover, a flow guide channel is arranged on the cover plate, and two ends of the flow guide channel are respectively communicated with the first cooling flow channel and the oil inlet hole.

In one embodiment, the cover plate comprises a body, a first boss and a second boss, the first boss and the second boss are respectively formed by extending the cover plate along the direction towards the end cover, and the diversion channel is jointly defined by the body, the first boss and the second boss; the liquid inlet end of the flow guide channel is formed at the end part of the first boss, the liquid outlet end of the flow guide channel is formed at the end part of the second boss, the end part of the first boss is in butt joint with the liquid outlet end of the first cooling flow channel, and the end part of the second boss is in butt joint with the oil inlet hole.

In one embodiment, the motor further comprises a rotor shaft rotatably arranged in the cavity, wherein the end part of the rotor shaft is in running fit with the bearing, and a second cooling flow passage extending to the end part of the rotor shaft is arranged in the rotor shaft; the cover plate further comprises a third boss, a drainage channel communicated with the drainage channel is defined in the third boss, the liquid outlet end of the drainage channel is formed at the end part of the third boss, and the end part of the third boss is in butt joint with the liquid inlet end of the second cooling flow channel.

In one embodiment, a closed cavity is defined between the cover plate and the end cover, and the communicating parts of the diversion channel, the first cooling flow passage and the oil inlet are all positioned in the closed cavity.

As another aspect of the embodiment of the present application, the embodiment of the present application further provides a vehicle including the motor according to any one of the above embodiments of the present application.

According to the motor provided by the embodiment of the application, the annular boss is arranged on the end cover so that the oil storage groove is defined between the annular boss and the bearing, and the oil inlet and the oil outlet which are communicated with the oil storage groove are arranged on the end cover, so that the lubrication of the bearing of the motor is realized, the working reliability of the bearing is ensured, and other structures are not required to be arranged on the end cover, so that the structure of the motor is simplified, the integration level of the motor is improved, and the overall dimension of the motor is reduced. Secondly, through the position that is higher than the oil inlet in the direction of height of motor and is less than the minimum at annular boss inboard border, can play the effect of backstop to the lubricating oil in the oil storage tank, avoided the lubricating oil in the oil storage tank to overflow to the opposite side of annular boss beyond the inboard border of annular boss to avoid lubricating oil to the operation that other parts such as brush, conducting ring, the component that changes soon of installing in annular boss opposite side cause the influence, and then promoted the job stabilization nature and the reliability of motor.

The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.

Drawings

In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.

Fig. 1 shows a schematic cross-sectional structure of a motor according to an embodiment of the present application;

Fig. 2 shows a side view of an electric machine according to an embodiment of the application.

Reference numerals illustrate:

A motor 1;

A housing 10; a cavity 10a; a first cooling flow passage 11;

An end cap 20; an oil reservoir 20a; an oil inlet hole 20b; an oil outlet hole 20c; an annular boss 21; a stop wall 211; a gasket 22; a bearing pad 23;

A bearing 30;

A cover plate 40; a diversion channel 40a; a drainage channel 40b; a closed cavity 40c; a body 41; a first boss 42; a second boss 43; a third boss 44;

a rotor shaft 50; and a second cooling flow passage 51.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

An electric machine 1 according to an embodiment of the present application is described below with reference to fig. 1 and 2.

Fig. 1 shows a schematic structural view of a motor 1 according to an embodiment of the application, and fig. 2 shows a side view of the motor 1 according to an embodiment of the application. As shown in fig. 1 and 2, the motor 1 of the embodiment of the present application includes a housing 10 and an end cover 20. Specifically, the interior of the housing 10 defines a cavity 10a and the end has an opening communicating with the cavity 10 a. The end cover 20 is arranged at the opening, the end cover 20 is provided with a through installation cavity, the installation cavity is used for installing the bearing 30, the inner wall surface of the installation cavity is provided with an annular boss 21 protruding towards the inner side, and an oil storage tank 20a is defined between the annular boss 21 and the bearing 30. Wherein, the end cover 20 is also provided with an oil inlet hole 20b and an oil outlet hole 20c which are communicated with the oil storage tank 20 a; in the height direction of the motor 1, the oil outlet hole 20c is located higher than the oil inlet hole 20b and lower than the lowest point of the inner edge of the annular boss 21.

In an embodiment of the present application, the motor 1 may further include a stator assembly and a rotor assembly disposed in the housing 10, the stator assembly including a stator body and windings, the rotor assembly including a rotor shaft 50, the rotor shaft 50 being rotatably disposed in the cavity 10 a.

In the embodiment of the present application, the kind of the bearing 30 is not particularly limited, and for example, a deep groove ball bearing 30, a thrust ball bearing 30, a cylindrical rolling bearing 30, etc. may be used, and those skilled in the art may use a corresponding type of bearing 30 according to actual situations.

Illustratively, the end cover 20 is provided with a mounting cavity provided through the end cover 20 in the axial direction of the rotor shaft 50, the mounting cavity communicating with the cavity 10a inside the housing 10 so that the end of the rotor shaft 50 can be pierced in the mounting cavity by the cavity 10 a. The bearing 30 is mounted in the mounting cavity, and the end of the rotor shaft 50 is threaded through the bearing 30 and forms a running fit with the bearing 30.

Illustratively, the annular boss 21 is formed by protruding an inner peripheral wall of the installation cavity toward the inside, and the annular boss 21 extends in the circumferential direction of the installation cavity to form a closed annular shape. In the embodiment of the present application, the cross-sectional shape of the annular boss 21 is not particularly limited, and the annular boss 21 may be circular or irregular. The annular boss 21 and the bearing 30 are disposed at a spacing in the axial direction of the rotor shaft 50 such that the annular boss 21 and the bearing 30 define an oil reservoir 20a in the installation cavity. The oil inlet holes 20b and the oil outlet holes 20c are provided at intervals in the circumferential direction of the end cap 20, and the oil inlet holes 20b and the oil outlet holes 20c extend inward from the end face of the end cap 20 on the side away from the casing 10 and communicate with the oil reservoir 20a, respectively.

The height direction of the motor 1 is understood to be the vertical direction of the motor 1 after the completion of the installation. The inner edge of the annular boss 21 is understood to be the edge of the annular boss 21 adjacent to the side of the interior of the mounting cavity. By arranging the position of the oil outlet 20c in the vertical direction on the upper side of the position of the oil inlet 20b and arranging the position of the oil outlet 20c in the vertical direction at the lowest point of the inner side edge of the annular boss 21, the lubricating oil in the oil storage tank 20a can enter the oil storage tank 20a through the oil inlet 20b and then enter the gap between adjacent rollers of the bearing 30 to lubricate the bearing 30, and overflows through the oil outlet 20c when the liquid level of the lubricating oil in the oil storage tank 20a rises to a certain height, and since the lowest point of the inner side edge of the annular boss 21 is higher than the height position of the oil outlet 20c, the annular boss 21 can play a role of blocking oil, and the lubricating oil in the oil storage tank 20a is prevented from overflowing beyond the lowest point of the inner side edge of the annular boss 21.

According to the motor 1 of the embodiment of the application, the annular boss 21 is arranged on the end cover 20 so that the oil storage groove 20a is defined between the annular boss 21 and the bearing 30, and the oil inlet hole 20b and the oil outlet hole 20c which are communicated with the oil storage groove 20a are arranged on the end cover 20, so that lubrication of the bearing 30 of the motor 1 is realized, the working reliability of the bearing 30 is ensured, and other structures are not required to be arranged on the end cover 20, thereby simplifying the structure of the motor 1, being beneficial to improving the integration level of the motor 1 and reducing the outline dimension of the motor 1. Secondly, through the position that is higher than oil inlet hole 20b and is less than the extreme low point of annular boss 21 inboard border in the height direction of motor 1 oil outlet hole 20c, can play the effect of backstop to the lubricating oil in the oil storage tank 20a, avoided the lubricating oil in the oil storage tank 20a to overflow to the opposite side of annular boss 21 beyond annular boss 21's inboard border to avoid lubricating oil to influence the normal work of other parts such as brush, conducting ring, the component that changes soon of installing in annular boss 21 opposite side, and then promoted motor 1's job stabilization nature and reliability.

In one embodiment, as shown in fig. 2, the cross-sectional shape of the inner edge of the annular boss 21 includes a straight line segment and an arc segment, the straight line segment is disposed in the horizontal direction, and the arc segment is located on the upper side of the straight line segment and has both ends connected to both ends of the straight line segment, respectively.

Illustratively, the cross-sectional shape of the inner edge of the annular boss 21 may be understood as the shape of the inner contour of the annular boss 21 that is truncated by the cross-section. The center of a circle corresponding to the arc line segment is positioned on the central axis of the installation cavity, two ends of the straight line segment are respectively connected with two ends of the arc line segment, and the straight line segment extends along the horizontal direction. The lowest point of the inner edge of the annular boss 21 is the edge corresponding to the straight line segment included in the cross section of the annular boss 21.

It will be appreciated that the hollow region defined by the annular boss 21 communicates with the mounting cavity for the end of the rotor shaft 50 to extend from the hollow region to the side of the end cap 20 remote from the housing 10.

In one embodiment, a stop wall 211 is formed on a side of the annular boss 21 adjacent to the bearing 30, and an oil reservoir 20a is defined between the stop wall 211 and an end surface of the bearing 30.

Illustratively, a side of the annular boss 21 adjacent to the bearing 30 forms an annular stop wall 211 for blocking the overflow of a certain height level of lubricating oil to the side of the annular boss 21 remote from the housing 10. The stop wall 211 is spaced from the end surface of the bearing 30 in the axial direction of the rotor shaft 50 such that the stop wall 211, the end surface of the bearing 30, and the inner wall surface of the installation cavity together define the oil reservoir 20a.

So set up, the oil storage tank 20a that is jointly limited between the internal wall surface of backstop wall 211, bearing 30 and installation cavity can hold a certain amount of lubricating oil to can realize the continuous lubrication to bearing 30 under the operating mode that motor 1 stopped initiative lubrication, thereby ensure motor 1's job stabilization nature.

In one embodiment, as shown in FIG. 1, a washer 22 is disposed within the mounting cavity, and a bearing 30 is embedded in the washer 22.

Illustratively, the gasket 22 may be made of rubber, and an outer peripheral wall of the gasket 22 is attached to an inner wall surface of the mounting chamber, and an inner peripheral wall of the gasket 22 is attached to an outer peripheral wall of the bearing 30. By the arrangement, the mounting reliability of the bearing 30 in the mounting cavity can be improved, and a certain buffer effect can be provided for the bearing 30.

In one embodiment, as shown in FIG. 1, a side of the bearing 30 adjacent to the sump 20a is provided with a bearing spacer 23.

Illustratively, the bearing pad 23 may be made of a metal material, such as steel. The bearing spacer 23 is clamped in the mounting cavity and is located between the end face of the bearing 30 and the stop wall 211 of the annular boss 21.

By this arrangement, the bearing 30 can be positioned, and the bearing 30 is prevented from moving axially in the mounting chamber so that the bearing 30 and the stopper wall 211 of the annular boss 21 are fitted to each other, thereby ensuring that the oil reservoir 20a is formed between the end surface of the bearing 30 and the stopper wall 211.

In one embodiment, as shown in fig. 1, the wall of the housing 10 is provided with a first cooling flow passage 11 extending to the end of the housing 10, and the motor 1 further includes a cover plate 40. Specifically, the cover plate 40 is disposed on a side of the end cover 20 away from the housing 10, and the cover plate 40 is provided with a flow guiding channel 40a, and two ends of the flow guiding channel 40a are respectively communicated with the first cooling flow channel 11 and the oil inlet hole 20 b.

For example, the first cooling flow passage 11 may extend in a direction parallel to the axial direction of the rotor shaft 50 and extend to an end of the housing 10. The first cooling flow passage 11 is used for flowing a cooling medium to effect cooling of the housing 10 and the inside thereof. In the embodiment of the present application, the cooling medium may be cooling oil, and further may be lubricating oil for lubricating the bearing 30.

In some examples, the cover 40 may be specifically a rotary cover of the motor 1.

Illustratively, the cover plate 40 covers a side of the end cap 20 remote from the housing 10. The cover plate 40 defines a flow guiding channel 40a inside, two ends of the flow guiding channel 40a form a liquid inlet end and a liquid outlet end respectively, the liquid inlet end of the flow guiding channel 40a is suitable for being communicated with the first cooling flow channel 11 of the shell 10, and the liquid outlet end of the flow guiding channel 40a is suitable for being communicated with the oil inlet hole 20 b.

So set up, the water conservancy diversion passageway 40a of apron 40 can be with the first cooling runner 11 and the inlet port 20b intercommunication of casing 10 to with the lubricating oil in the first cooling runner 11 through water conservancy diversion passageway 40a and inlet port water conservancy diversion to oil storage tank 20a in, and then can utilize the cooling medium in the first cold zone runner to realize the lubrication to bearing 30, thereby simplified the oil circuit design of motor 1, reduced the structural complexity of motor 1.

Optionally, the cover 40 includes a body 41, a first boss 42 and a second boss 43, where the first boss 42 and the second boss 43 are respectively formed by extending the cover 40 in a direction toward the end cover 20, and the diversion channel 40a is defined by the body 41, the first boss 42 and the second boss 43 together; the liquid inlet end of the flow guiding channel 40a is formed at the end of the first boss 42, the liquid outlet end of the flow guiding channel 40a is formed at the end of the second boss 43, the end of the first boss 42 is abutted with the liquid outlet end of the first cooling flow channel 11, and the end of the second boss 43 is abutted with the oil inlet hole 20 b.

Illustratively, the end cover 20 is provided with an avoidance through hole, and the avoidance through hole is disposed through the end cover 20 and corresponds to the liquid outlet end of the first diversion channel 40a, and the first boss 42 is adapted to pass through the avoidance through hole to be in butt joint with the liquid outlet end of the first cooling flow channel 11, so as to communicate the diversion channel 40a with the first cooling flow channel 11. The second boss 43 is disposed opposite to the liquid inlet, and the end face of the second boss 43 is disposed opposite to the end face of the end cover 20, so that the diversion channel 40a is communicated with the liquid inlet.

Optionally, the motor 1 further includes a rotor shaft 50, the rotor shaft 50 is rotatably disposed in the cavity 10a and an end of the rotor shaft 50 forms a running fit with the bearing 30, and a second cooling flow passage 51 extending to the end of the rotor shaft 50 is disposed inside the rotor shaft 50; the cover plate 40 further includes a third boss 44, a drainage channel 40b communicating with the drainage channel 40a is defined in the third boss 44, a liquid outlet end of the drainage channel 40b is formed at an end of the third boss 44, and an end of the third boss 44 is in butt joint with a liquid inlet end of the second cooling flow channel 51.

Illustratively, the interior of the rotor shaft 50 defines a second cooling flow passage 51 for the flow of a cooling medium to effect cooling of the rotor shaft 50. In the embodiment of the present application, the cooling medium in the second cooling flow passage 51 may be cooling oil, and further may be lubricating oil for lubricating the bearing 30.

In some examples, the third boss 44 is formed by the cover plate 40 protruding in a direction toward the end cap 20, the inside of the third boss 44 defines a drainage channel 40b communicating with the drainage channel 40a, and a liquid outlet end of the drainage channel 40b is formed at an end face of the third boss 44. The third boss 44 is disposed corresponding to the second cooling flow passage 51 of the rotor shaft 50, and an end portion of the third boss 44 is adapted to be inserted into the second cooling flow passage 51 to communicate the drainage channel 40b with the second cooling flow passage 51.

Through the above embodiment, the first cooling flow passage 11, the diversion passage 40a, the oil reservoir 20a, the diversion passage 40b, and the second cooling flow passage 51 are communicated, so that the entire oil path structure of the motor 1 is formed, and the cooling medium in the first cooling flow passage 11 can lubricate the bearing 30 and also cool the rotor shaft 50.

In one embodiment, as shown in fig. 1, a closed cavity 40c is defined between the cover plate 40 and the end cover 20, and the communication points between the diversion channel 40a and the first cooling flow passage 11 and the oil inlet hole 20b are all located in the closed cavity 40 c.

So configured, even if the lubricating oil leaks from the communication position of the diversion passage 40a and the first cooling flow passage 11 or the communication position of the diversion passage 40a and the oil inlet hole 20b, the lubricating oil is merely accumulated in the closed cavity 40c, thereby reducing the risk of the lubricating oil leaking to the outside of the motor 1.

Other configurations of the vehicle of the above embodiments may be applied to various technical solutions now and in the future known to those skilled in the art, and will not be described in detail herein.

In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above disclosure provides many different embodiments, or examples, for implementing different structures of the application. The foregoing description of specific example components and arrangements has been presented to simplify the present disclosure. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that various changes and substitutions are possible within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electric machine, comprising:

A housing defining a cavity therein and having an opening at an end in communication with the cavity;

The end cover is arranged at the opening and is provided with a through installation cavity, the installation cavity is used for installing a bearing, the inner wall surface of the installation cavity is provided with an annular boss protruding towards the inner side, and an oil storage tank is defined between the annular boss and the bearing;

The end cover is also provided with an oil inlet and an oil outlet which are communicated with the oil storage tank; in the height direction of the motor, the oil outlet is higher than the oil inlet and lower than the lowest point of the inner side edge of the annular boss.

2. The motor of claim 1, wherein the cross-sectional shape of the inner edge of the annular boss includes a straight line segment and an arc segment, the straight line segment being disposed in a horizontal direction, the arc segment being located on an upper side of the straight line segment and having both ends connected to both ends of the straight line segment, respectively.

3. The electric machine of claim 1, wherein a side of the annular boss adjacent the bearing forms a stop wall, the stop wall and an end surface of the bearing defining the oil reservoir therebetween.

4. The electric machine of claim 1, wherein a washer is disposed within the mounting cavity, the bearing being embedded in the washer.

5. The electric machine of claim 1, wherein a side of the bearing adjacent the sump is provided with a bearing spacer.

6. The electric machine of any one of claims 1 to 5, wherein the wall of the housing is provided with a first cooling flow passage extending to an end of the housing, the electric machine further comprising:

7. The motor of claim 6, wherein the cover plate includes a body, a first boss and a second boss, the first boss and the second boss being formed by the cover plate extending in a direction toward the end cap, respectively, the flow-directing channel being defined by the body, the first boss and the second boss together; the liquid inlet end of the flow guide channel is formed at the end part of the first boss, the liquid outlet end of the flow guide channel is formed at the end part of the second boss, the end part of the first boss is in butt joint with the liquid outlet end of the first cooling flow channel, and the end part of the second boss is in butt joint with the oil inlet hole.

8. The electric machine of claim 7, further comprising a rotor shaft rotatably disposed in the cavity and having an end in rotational engagement with the bearing, the rotor shaft having a second cooling flow passage disposed therein extending to the end of the rotor shaft; the cover plate further comprises a third boss, a drainage channel communicated with the diversion channel is defined in the third boss, a liquid outlet end of the drainage channel is formed at the end part of the third boss, and the end part of the third boss is in butt joint with the liquid inlet end of the second cooling flow channel.

9. The motor of claim 6, wherein a closed cavity is defined between the cover plate and the end cover, and the communication points of the diversion channel, the first cooling flow passage and the oil inlet hole are all located in the closed cavity.

10. A vehicle comprising an electric machine as claimed in any one of claims 1 to 9.