Conductive device, motor assembly and vehicle

Abstract

The utility model discloses a conductive device, a motor assembly and a vehicle. The conductive device comprises a conductive base, a conductive ejector rod and an elastic piece, the conductive base is used for being connected with a motor shaft of a motor assembly, and the conductive base is provided with a first cavity; the conductive ejector rod is accommodated in the first cavity through the opening part of the first cavity, the conductive ejector rod is provided with a second cavity, the opening of the second cavity faces the bottom wall of the first cavity, and the opening of the first cavity and the bottom wall of the second cavity are spaced; one end of the elastic piece is supported on the bottom wall of the first cavity, the other end of the elastic piece is supported on the bottom wall of the second cavity, and the end face, away from the bottom wall of the first cavity, of the conductive ejector rod is used for abutting against a shell of the motor assembly. The elastic piece is elastically supported in the conductive base and the conductive ejector rod through the opening of the first cavity and the opening of the second cavity, and motor shaft current can be transmitted to a shell of the motor assembly through the conductive base, the conductive ejector rod and the elastic piece, so that the motor shaft current is guided out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a conductive device, an electric machine assembly and a vehicle. BACKGROUND

[0002] The electric machine is the core component of various electrically driven tools. In the operation process of the electric machine, shaft current is usually generated, which is extremely harmful to the bearing system and can cause the bearing to ablate in a very short time, seriously affecting the reliability and safety of the electric drive system.

[0003] One of the current methods for handling shaft current is to directly guide the shaft current out through a conductor to protect the bearing from damage. However, the structure for guiding the shaft current out through the conductor usually requires a high centering requirement between the conductor and the shaft center of the electric machine. The connection between the conductor and the electric machine shaft has a risk of falling off, and the conductive structure has insufficient reliability when working, so the structure of the conductor needs to be further improved. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a conductive device to solve the above technical problems in the prior art.

[0005] To solve the above problems, the present application provides a conductive device, which comprises a conductive base, a conductive top rod and an elastic member. The conductive base is used to connect with the electric machine shaft of an electric machine assembly, and the conductive base is provided with a first cavity. The conductive top rod is accommodated in the first cavity through an opening part of the first cavity. The conductive top rod is provided with a second cavity, and the opening of the second cavity faces the bottom wall of the first cavity. The opening of the first cavity and the bottom wall of the second cavity are spaced apart. One end of the elastic member is supported on the bottom wall of the first cavity, and the other end is supported on the bottom wall of the second cavity. The end face of the conductive top rod away from the bottom wall of the first cavity is used to abut against the shell of the electric machine assembly.

[0006] Preferably, the conductive top rod comprises a first cylinder and a second cylinder. The first cylinder is located in the first cavity, and the second cylinder is connected to the side of the first cylinder away from the bottom wall of the first cavity. The first cylinder and the second cylinder jointly form the second cavity. The radial dimension of the first cylinder is greater than the radial dimension of the second cylinder and the opening of the first cavity. The radial dimension of the second cylinder is smaller than the radial dimension of the opening of the first cavity.

[0007] Preferably, the conductive device comprises a conductive bearing. The conductive bearing has a shaft hole. The outer peripheral wall of the conductive bearing is fixedly connected with the electric machine shaft of the electric machine assembly. The conductive base is inserted into the shaft hole and in contact with the inner peripheral wall of the conductive bearing.

[0008] Preferably, the conductive base comprises a main body part and a plug-in part, the main body part and the plug-in part are connected, the main body part is formed with the first cavity, and the plug-in part is inserted into the shaft hole.

[0009] Preferably, the radial dimension of the main body part is greater than the radial dimension of the plug-in part, so as to form a step at the connection of the main body part and the plug-in part, and the step abuts against the end face of the conductive bearing.

[0010] To solve the above problems, the application further provides an electric machine assembly, which comprises an electric machine shaft, a shell and the conductive device, part of the electric machine shaft is located in the shell, the conductive device is located in the shell, the conductive bearing of the conductive device is connected with the electric machine shaft, and the end face of the conductive top rod away from the bottom wall of the first cavity abuts against the shell of the electric machine assembly.

[0011] Preferably, one end of the electric machine shaft located inside the shell is provided with a receiving hole, the opening of the receiving hole faces the inner end wall of the shell, part of the conductive device is located in the receiving hole, one end of the conductive device is connected with the electric machine shaft, and the other end abuts against the inner end wall of the shell.

[0012] Preferably, the receiving hole comprises a first hole section and a second hole section which are in communication with each other, the first hole section is closer to the inner end wall of the shell than the second hole section, and the radial dimension of the first hole section is greater than the radial dimension of the second hole section, so as to form a bearing step at the connection of the first hole section and the second hole section, and the conductive bearing of the conductive device is arranged at the bearing step.

[0013] Preferably, the inner end wall of the shell is provided with a protruding part, the protruding part extends towards the electric machine shaft, and the protruding part abuts against the conductive top rod.

[0014] To solve the above problems, the application further provides a vehicle, which comprises the electric machine assembly.

[0015] Compared with the prior art, the conductive device provided by the application comprises a conductive base, a conductive top rod and an elastic member, the conductive base is used for being connected with a motor shaft of a motor assembly, the conductive base is provided with a first cavity; the conductive top rod is accommodated in the first cavity through an opening part of the first cavity, the conductive top rod is provided with a second cavity, an opening of the second cavity faces a bottom wall of the first cavity, and the opening of the first cavity and the bottom wall of the second cavity are spaced apart; one end of the elastic member is supported on the bottom wall of the first cavity, the other end of the elastic member is supported on a bottom wall of the second cavity, and an end face of the conductive top rod, which is away from the bottom wall of the first cavity, is used for abutting against a shell of the motor assembly. Through the above-mentioned implementation, the elastic member is elastically supported in the inside of the conductive base and the conductive top rod through the opening of the first cavity and the opening of the second cavity, so that the elastic member cannot fall off and twist, the elastic member abuts against the conductive top rod to make the conductive top rod contact the shell of the motor assembly, so that when the conductive device is applied to the motor assembly, shaft current can be transmitted to the shell of the motor assembly through the conductive base, the conductive top rod and the elastic member, thereby leading out the shaft current. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1 is a structural schematic diagram of an embodiment of the conductive device provided by the present application;

[0018] Figure 2 is Figure 1 is a sectional structural schematic diagram of the conductive device shown in FIG. 1 along the direction of A-A;

[0019] Figure 3 is Figure 2 is a sectional structural schematic diagram of the conductive device shown in FIG. 1 along the direction of A-A;

[0020] Figure 4 is a structural schematic diagram of an embodiment of the motor assembly provided by the present application.

[0021] FIG. 1 is a structural schematic diagram of an embodiment of the motor assembly provided by the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0024] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0025] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. The skilled person explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0027] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] The motor is the core component of various electrically driven tools. During the operation of the motor, shaft current is usually generated, which is extremely harmful to the bearing system and can cause the bearing to ablate in a very short time, seriously affecting the reliability and safety of the electric drive system.

[0031] One of the current methods for handling shaft current is to directly guide the shaft current out through a conductor to protect the bearing from damage. However, the structure for guiding the shaft current out through the conductor usually requires a high centering requirement between the conductor and the shaft center of the motor, and the connection between the conductor and the motor shaft has a risk of falling off. The reliability of the conductive structure is insufficient during operation, and further improvement is needed for the structure of the conductor.

[0032] To solve the technical problems in the related art, the present application provides a conductive device 10, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 1 is a structural schematic diagram of an embodiment of the conductive device 10 provided by the present application, Figure 2 is a structural schematic diagram of the conductive device shown in Figure 1 along the A-A direction, Figure 3 is a structural schematic diagram of the conductive device shown in Figure 2 without the elastic member.

[0033] The conductive device 10 comprises a conductive base 110, a conductive top rod 120 and an elastic member 130. The conductive base 110 is used to connect with the motor shaft 20 of the motor assembly 1, and is provided with a first cavity 111. The conductive top rod 120 is accommodated in the first cavity 111 through an open part of the first cavity 111, and is provided with a second cavity 121. An opening of the second cavity 121 faces a bottom wall of the first cavity 111, and the opening of the first cavity 111 and the bottom wall of the second cavity 121 are spaced apart. One end of the elastic member 130 is supported on the bottom wall of the first cavity 111, and the other end is supported on the bottom wall of the second cavity 121. An end face of the conductive top rod 120 away from the bottom wall of the first cavity 111 is used to abut against the shell 30 of the motor assembly 1.

[0034] The conductive top rod 120 is pre-contained inside the conductive base 110 through the opening part of the first cavity 111, and the conductive top rod 120 can slide relative to the conductive base 110. The elastic member 130 is elastically supported in the second cavity 121 of the conductive top rod 120 and the first cavity 111 of the conductive base 110 through the opening of the second cavity 121, so that the elastic member 130 does not have the risk of twisting and falling off. When the elastic member 130 is compressed, the conductive top rod 120 can move to the first cavity 111 inside the conductive base 110 through the opening of the first cavity 111. When the elastic member 130 is stretched, the conductive top rod 120 is pressed to make the conductive top rod 120 extend out of the first cavity 111 inside the conductive base 110 through the opening part of the first cavity 111. When the conductive device 10 is installed on the motor assembly 1, one side of the conductive device 10 is connected with the motor shaft 20 of the motor assembly 1, and the other side is in contact with the shell 30 of the motor assembly 1 through the conductive top rod 120. It can be understood that when installed, the shell 30 of the motor assembly 1 presses the conductive top rod 120, so that the conductive top rod 120 moves a certain distance inside the conductive base 110 through the opening of the first cavity 111. The conductive top rod 120 presses the elastic member 130, so that the elastic member 130 is in a compressed state. In turn, the elastic member 130 presses the conductive top rod 120 against the shell 30 of the motor assembly 1 by elastic force, so that the shell 30 and the conductive top rod 120 remain in contact. It should be noted that when the elastic member 130 is arranged in the second cavity 121 of the conductive top rod 120 and the first cavity 111 of the conductive base 110, the elastic member 130 can be arranged in a natural state (not compressed or stretched), or the elastic member 130 can be arranged in a certain compressed state. It is only necessary to ensure that the conductive top rod 120 extends out of the inside of the conductive base 110 through the opening part of the first cavity 111 under the action of the elastic member 130, so as to facilitate the application of the conductive device 10 to the motor assembly 1. The conductive top rod 120 moves a certain distance into the first cavity 111 inside the conductive base 110 to make the conductive top rod 120 contact the shell 30 of the motor assembly 1. In this way, the conductive top rod 120 can be arranged to be telescopic through the opening of the first cavity 111, so that the installation is simple, and there is no problem of alignment, falling off risk and twisting risk of the elastic member 130. The elastic member 130 can be a spring in particular. The shaft current can be led out of the body through the conductive base 110, the elastic member 130, the conductive top rod 120 and the shell 30 of the motor assembly 1, effectively solving the harm of the shaft current to the motor assembly 1.

[0035] The conductive top rod 120 comprises a first barrel 122 and a second barrel 123, the first barrel 122 is located in the first cavity 111, and the second barrel 123 is connected to the first barrel 122 away from the bottom wall of the first cavity 111, the first barrel 122 and the second barrel 123 jointly form the second cavity 121, the radial dimension of the first barrel 122 is greater than the radial dimension of the opening of the first cavity 111 and the second barrel 123, and the radial dimension of the second barrel 123 is less than the radial dimension of the opening of the first cavity 111.

[0036] The radial dimension of the second barrel 123 is slightly smaller than the dimension of the opening of the first cavity 111, so that the second barrel 123 can move in the opening of the first cavity 111, and the connecting part of the first barrel 122 and the second barrel 123 forms a limiting step, so that the first barrel 122 is blocked by the limiting step when moving to the opening of the first cavity 111, so that the first barrel 122 will not move out of the inside of the conductive base 110, thereby ensuring that the conductive base 110 and the conductive top rod 120 are always in contact, so that the elastic member 130 is always limited in the first cavity 111 of the conductive base 110 and the second cavity 121 of the conductive top rod 120, and the elastic member 130 will not have the risk of falling off.

[0037] The conductive device 10 comprises a conductive bearing 140, the conductive bearing 140 has a shaft hole, the outer peripheral wall 141 of the conductive bearing 140 is fixedly connected with the motor shaft 20 of the motor assembly 1, and the conductive base 110 is inserted into the shaft hole and in contact with the inner peripheral wall 142 of the conductive bearing 140.

[0038] The conductive base 110 is connected with the motor shaft 20 through the conductive bearing 140, the outer peripheral wall 141 of the conductive bearing 140 is connected with the motor shaft 20, the outer peripheral wall 141 of the conductive bearing 140 rotates with the motor shaft 20, the inner peripheral wall 142 of the conductive bearing 140 does not rotate with the motor shaft 20, the conductive base 110 is inserted into the shaft hole formed by the inner peripheral wall 142 of the conductive bearing 140, so that the conductive base 110 does not rotate with the motor shaft 20, thereby reducing the loss of the conductive base 110, and the shaft current is transmitted to the conductive base 110 through the conductive bearing 140.

[0039] The conductive base 110 comprises a main body part 112 and a plug-in part 113, the main body part 112 and the plug-in part 113 are connected, the main body part 112 forms the first cavity 111, and the plug-in part 113 is inserted into the shaft hole. The plug-in part 113 is inserted into the shaft hole to be in contact with the conductive bearing 140 to transmit the shaft current to the conductive base 110, and the main body part 112 is used to sleeve the conductive top rod 120 and the elastic member 130 to transmit the shaft current to the conductive top rod 120 and the elastic member 130.

[0040] The radial dimension of the main body part 112 is greater than the radial dimension of the insertion part 113, so as to form a step at the connection of the main body part 112 and the insertion part 113, the step abutting against the end face of the conductive bearing 140. The step formed at the connection of the main body part 112 and the insertion part 113 makes the main body part 112 contact the side end face of the conductive bearing 140 through the step, increases the contact area of the conductive base 110 and the conductive bearing 140, and further increases the flow area of the shaft current, while the elastic member 130 abuts against the bottom wall of the first cavity 111 at one end, so as to keep the main body part 112 and the insertion part 113 in close contact with the conductive bearing 140.

[0041] Referring to Figure 4 , Figure 4 is an embodiment structure schematic diagram of the motor assembly 1 provided in the application.

[0042] The application further provides a motor assembly 1, which comprises a motor shaft 20, a shell 30 and the conductive device 10 described above, part of the motor shaft 20 is located in the shell 30, the conductive device 10 is located in the shell 30, the conductive bearing 140 of the conductive device 10 is connected with the motor shaft 20, and the end face of the conductive top rod 120 away from the bottom wall of the first cavity 111 abuts against the shell 30 of the motor assembly 1. The motor assembly 1 has a space for installing the conductive device 10, one side of the conductive device 10 is connected with the motor shaft 20, and the other side is in contact with the shell 30, so as to form a shaft current passage between the motor shaft 20 and the shell 30. The conductive device 10 is connected with the motor shaft 20 through the conductive bearing 140, and the conductive device 10 and the shell 30 form a passage through the contact of the conductive top rod 120 and the shell 30.

[0043] The end of the motor shaft 20 located in the shell 30 is provided with a containing hole 40, the opening of the containing hole 40 faces the inner end wall of the shell 30, part of the conductive device 10 is located in the containing hole 40, one end of the conductive device 10 is connected with the motor shaft 20, and the other end abuts against the inner end wall of the shell 30.

[0044] Part of the conductive base 110 and the conductive bearing 140 of the conductive device 10 are located in the containing hole 40, through the setting of the containing hole 40, the conductive base 110 located in the containing hole 40 is only in contact with the conductive bearing 140, the conductive base 110 is spaced apart from the motor shaft 20, the conductive base 110 of the conductive device 10 extends out of the containing hole 40 through the opening of the containing hole 40, and the conductive base 110 is connected with the motor shaft 20 through the conductive bearing 140.

[0045] The accommodating hole 40 comprises a first hole section 410 and a second hole section 420 which are in communication with each other, the first hole section 410 is closer to the inner end wall of the shell 30 relative to the second hole section 420, the radial dimension of the first hole section 410 is greater than that of the second hole section 420, so as to form a bearing step 210 at the connection of the first hole section 410 and the second hole section 420, and the conductive bearing 140 of the conductive device 10 is arranged at the bearing step 210.

[0046] The conductive bearing 140 and the partial conductive base 110 of the conductive device 10 are located in the first hole section 410, the conductive base 110 and the motor shaft 20 have a gap, and the second hole section 420 is arranged so that the plug-in part 113 of the conductive base 110 is separated from the motor shaft 20, so as to avoid direct contact between the conductive base 110 and the motor shaft 20 to drive the conductive base 110 to rotate by the rotation of the motor shaft 20, thereby reducing the loss of the conductive base 110, and the conductive bearing 140 is arranged at the bearing step 210, so that the bearing step 210 formed at the first hole section 410 and the second hole section 420 causes the motor shaft 20 and the conductive bearing 140 to be interference connected, thereby increasing the stability of the connection between the conductive bearing 140 and the motor shaft 20.

[0047] The inner end wall of the shell 30 is provided with a protrusion 310 which extends towards the motor shaft 20, and the protrusion 310 abuts against the conductive top rod 120. The protrusion 310 arranged on the inner end wall of the shell 30 is used to abut against the conductive top rod 120, so as to form a passage with the conductive device 10, because the conductive device 10 is connected by the end surface of the conductive top rod 120 and the shell 30, so in some embodiments, the protrusion can also not be arranged on the shell 30, so that the conductive top rod 120 directly contacts the shell 30. Therefore, the arrangement of the conductive device 10 in the present application enables the shell 30 to be made by die casting process or stamping process according to actual conditions, the conductive device 10 has lower requirements for process precision and better universality, which is conducive to improving the process feasibility.

[0048] The present application also provides a vehicle, which comprises the motor assembly 1 described above. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc.

[0049] In summary, the conductive device 10 provided by the application sets the elastic member 130 in the second cavity 121 of the conductive top rod 120 and the first cavity 111 of the conductive base 110, part of the conductive top rod 120 is embedded in the inside of the conductive base 110 through the first cavity 111 opening, the conductive top rod 120 can be telescopic in the first cavity 111 opening, which is convenient for the conductive device 10 to be installed in the motor assembly 1, the conductive base 110 is connected with the motor shaft 20 through the conductive bearing 140, which avoids the large loss caused by the rotation of the conductive base 110 with the motor shaft 20. Therefore, the conductive device 10 of the application can not only export the shaft current out of the body through the conductive bearing 140, the conductive base 110, the elastic member 130, the conductive top rod 120 and the shell 30, but also is convenient to install when applied to the motor assembly 1, and there is no problem such as alignment, falling off and distortion risk of the elastic member 130 during installation, and the process precision requirement is low, the process feasibility is high, the conductive device 10 works stably and has high reliability.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrically conductive device, characterized by The conductive device is applied to a motor assembly, and the conductive device comprises: a conductive base configured to be connected to a motor shaft of the motor assembly, the conductive base being provided with a first cavity; a conductive top rod accommodated in the first cavity through an opening portion of the first cavity, the conductive top rod being provided with a second cavity, an opening of the second cavity being directed to a bottom wall of the first cavity, the opening of the first cavity and the bottom wall of the second cavity being spaced apart; a resilient member, one end of the resilient member being supported on the bottom wall of the first cavity and the other end of the resilient member being supported on the bottom wall of the second cavity, an end surface of the conductive top rod away from the bottom wall of the first cavity being configured to abut against an outer shell of the motor assembly; and the conductive device comprises a conductive bearing, the conductive bearing having a shaft hole, an outer peripheral wall of the conductive bearing being fixedly connected to the motor shaft of the motor assembly, the conductive base being inserted into the shaft hole and being in contact with an inner peripheral wall of the conductive bearing.

2. The electrically conductive device of claim 1, wherein, The conductive top rod comprises a first cylinder and a second cylinder, the first cylinder being located in the first cavity, the second cylinder being connected to the first cylinder on a side away from the bottom wall of the first cavity, the first cylinder and the second cylinder jointly forming the second cavity, a radial dimension of the first cylinder being greater than radial dimensions of the second cylinder and the opening of the first cavity, and a radial dimension of the second cylinder being less than the radial dimension of the opening of the first cavity.

3. The electrically conductive device of claim 2, wherein, The conductive base comprises a main body and a plug-in portion, the main body and the plug-in portion being connected, the main body being formed with the first cavity, and the plug-in portion being inserted into the shaft hole.

4. The electrically conductive device of claim 3, wherein, A radial dimension of the main body is greater than a radial dimension of the plug-in portion, so as to form a step at a connection between the main body and the plug-in portion, the step abutting against an end surface of the conductive bearing.

5. An electric machine assembly characterized in that, The motor assembly comprises a motor shaft, an outer shell and the conductive device as claimed in any one of claims 1 to 4, part of the motor shaft being located in the outer shell, the conductive device being located in the outer shell, the conductive bearing of the conductive device being connected to the motor shaft, and an end surface of the conductive top rod away from the bottom wall of the first cavity abutting against the outer shell of the motor assembly.

6. The electric machine assembly of claim 5, wherein, An end of the motor shaft located inside the outer shell is provided with an accommodation hole, an opening of the accommodation hole being directed to an inner end wall of the outer shell, part of the conductive device being located in the accommodation hole, one end of the conductive device being connected to the motor shaft and the other end of the conductive device abutting against the inner end wall of the outer shell.

7. The electric machine assembly of claim 6, wherein, The accommodation hole comprises a first hole section and a second hole section in communication with each other, the first hole section being closer to the inner end wall of the outer shell relative to the second hole section, and a radial dimension of the first hole section being greater than a radial dimension of the second hole section, so as to form a bearing step at a connection between the first hole section and the second hole section, the conductive bearing of the conductive device being arranged at the bearing step.

8. The electric machine assembly of claim 6, wherein, The inner end wall of the outer shell is provided with a protruding portion, the protruding portion extending towards the motor shaft, and the protruding portion abutting against the conductive top rod.

9. A vehicle characterized by comprising: The vehicle comprises the motor assembly as claimed in any one of claims 5 to 8.

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