Electric machines and vehicles

Abstract

This application discloses an electric motor and a vehicle. The electric motor includes: a motor cavity extending along the axial direction of the motor and an end cover disposed at one axial end of the motor cavity. The end cover forms a support base, and the support base is provided with a bearing; a motor shaft passing through the motor cavity, one end of the motor shaft being supported on the bearing and extending out of the bearing along one side in the axial direction; a conductive seat mounted on the support base, the end of the motor shaft extending out of the bearing and the conductive seat defining a first cavity in the axial direction, the first cavity being independent of the mounting space of the bearing; and a conductive assembly disposed in the first cavity. The motor shaft, conductive assembly, conductive seat, and end cover are sequentially electrically connected. Thus, by arranging the conductive assembly in the first cavity defined by the cooperation of the motor shaft and the conductive seat, a reliable arrangement space is provided for the conductive assembly, ensuring the reliability of the electrical connection between the motor shaft and the conductive seat through the conductive assembly.

Description

Technical Field

[0001] This application relates to the field of electrical machinery technology, and in particular to an electric motor and a vehicle. Background Technology

[0002] Currently, with the development of new energy vehicle technology (such as vehicles powered by electric motors), the increasing speed of electric motors, and the use of silicon carbide modules in electronic control systems, shaft voltage issues arise in the motor shaft. Specifically, when the motor is in operation, the common-mode shaft voltage and cyclic shaft voltage generated on the motor shaft, after accumulating for a period of time, pose a risk of breaking down the oil film at the bearing supporting the motor shaft and causing discharge. Furthermore, after multiple conductive discharges at the bearing, electrolytic corrosion damage will occur to the balls, inner ring, and outer ring of the bearing.

[0003] In related technologies, shaft voltage can be extracted using fiber conductive brushes or conductive carbon rods. However, conductive carbon rods and carbon brushes can generate conductive solid particles due to wear. These solid particles pose a risk of entering the motor cavity, thus causing safety hazards on the high-voltage side of the motor bearings and windings. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a motor that has good protection and high reliability.

[0005] Another objective of this application is to propose a vehicle.

[0006] An electric motor according to a first aspect of this application includes: a housing assembly, a motor cavity extending along the motor axial direction and an end cap disposed at one axial end of the motor cavity, the end cap forming a support seat and the support seat being provided with a bearing; a motor shaft passing through the motor cavity, one end of the motor shaft being supported on the bearing and extending out of the bearing along one side in the axial direction; a conductive seat mounted on the support seat, the end of the motor shaft extending out of the bearing and the conductive seat defining a first cavity in a direction parallel to the axial direction, the first cavity being independent of the mounting space where the bearing is located; and a conductive component disposed in the first cavity, the motor shaft, the conductive component, the conductive seat and the end cap being sequentially electrically connected.

[0007] In this application, the motor shaft can be electrically connected to the housing assembly in sequence through a conductive component, a conductive seat, and an end cover to achieve electrical connection with the housing assembly. The conductive component and conductive seat can guide the shaft current to the housing assembly, thereby protecting the bearing, reducing the damage caused by electro-corrosion to the bearing, helping to extend the service life of the bearing, and improving the stability and reliability of the motor during operation.

[0008] Meanwhile, the conductive component is arranged within a first cavity defined by the motor shaft and the conductive base, thus providing reliable arrangement space for the conductive component to ensure the reliability of the electrical connection between the motor shaft and the conductive base. It is understood that conductive solid particles are generated due to wear during motor shaft rotation. These solid particles can be confined within the first cavity to prevent them from entering one side of the motor cavity and affecting the high-voltage components on that side. Furthermore, retaining the conductive solid particles within the first cavity enhances the conductive connection performance between the conductive base, the conductive component, and the motor shaft.

[0009] According to some embodiments of this application, the conductive seat has a groove on the side near the motor cavity, and the end of the motor shaft extends into the groove and is clearance-fitted with the inner peripheral wall of the groove to form a first cavity with the conductive seat.

[0010] According to some embodiments of this application, the gap size is L and satisfies the relationship: 0mm<L≤0.1mm.

[0011] According to some embodiments of this application, the support base has a second cavity arranged around the motor shaft, the second cavity facing and avoiding the rotatable portion of the bearing, and the second cavity forming part of the mounting space where the bearing is located.

[0012] According to some embodiments of this application,

[0013] The conductive base has a connecting flange at the open port of the groove. The connecting flange is arranged in a ring around the motor shaft. The connecting flange is folded outward in the radial direction of the motor shaft and connected to the support base.

[0014] The bearing is disposed opposite to the connecting flange in a direction parallel to the axial direction, and the second cavity is defined between the bearing and the connecting flange in a direction parallel to the axial direction.

[0015] According to some embodiments of this application, the motor further includes a first seal, which is disposed in the second cavity and forms an annular seal between the support and the motor shaft; and / or, the motor further includes a second seal, which is sandwiched between the inner peripheral wall of the groove and the motor shaft and forms an annular seal between the motor shaft and the conductive seat.

[0016] According to some embodiments of this application, the support base is provided with a central hole located between the bearing and the conductive seat, the central hole being clearance-fitted with the end of the motor shaft that extends out of the bearing, and the support base, the conductive seat, and the end of the motor shaft forming the first cavity.

[0017] According to some embodiments of this application, the conductive component includes: a conductive element, which is fixedly connected to the end of the motor shaft; an electrical connector, which is disposed in the first cavity and electrically connected to the conductive element and the conductive seat respectively, wherein the end of the conductive seat has a receiving groove that is recessed away from the motor shaft and open to the motor shaft, and at least a portion of the electrical connector extends into the receiving groove and is electrically connected to the conductive seat; the conductive component further includes an elastic element, which is disposed in the receiving groove and elastically supported between the electrical connector and the conductive seat to elastically support the electrical connector and the conductive element to maintain electrical connection.

[0018] According to some embodiments of this application, the bearing is provided with a first bearing seal cover at one end near the motor cavity in the axial direction, the first bearing seal cover being disposed between the inner ring and the outer ring of the bearing and isolating the bearing from the motor cavity; and / or, the bearing is provided with a second bearing seal cover at one end near the first cavity in the axial direction, the second bearing seal cover being disposed between the inner ring and the outer ring of the bearing and isolating the bearing from the first cavity.

[0019] According to a second aspect of this application, the vehicle includes the motor described above.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a partial cross-sectional view of an electric motor according to an embodiment of this application. Figure 1 ;

[0023] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a partial cross-sectional view of an electric motor according to an embodiment of this application. Figure 2 ;

[0025] Figure 4 This is a partial cross-sectional view of an electric motor according to an embodiment of this application. Figure 3 ;

[0026] Figure 5 This is a partial cross-sectional view of an electric motor according to an embodiment of this application. Figure 4 ;

[0027] Figure 6 yes Figure 5 A magnified view of a section at point B in the middle.

[0028] Figure label:

[0029] Motor 100;

[0030] Shell assembly 1; motor cavity 101; shell body 11; end cap 12; support base 121; cover 13;

[0031] Motor shaft 2; Support shaft section 21;

[0032] Conductive base 3; Groove 31; Receiving groove 32; Connecting flange 33; Groove structure 34;

[0033] Conductive component 4; conductive element 41; first connecting section 411; second connecting section 412; limiting flange 413; spherical end 414; electrical connector 42; elastic element 43;

[0034] Bearing 5; Inner ring 51; Outer ring 52; Ball 53; First bearing seal 54; Second bearing seal 55;

[0035] Second cavity 601; First cavity 602; First seal 71; Second seal 72; Connector 8. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0037] The following is for reference. Figures 1-6 A motor 100 according to an embodiment of this application is described.

[0038] It should be noted that when the motor 100 is running, the motor shaft 2 can rotate relative to the housing assembly 1 to realize the corresponding functions of the motor 100. For example, when the motor 100 is constructed as an electric motor, it can output power through the motor shaft 2; when the motor 100 is constructed as a generator 100, it can convert the kinetic energy at the motor shaft 2 into electrical energy to realize the power generation function of the generator 100.

[0039] Currently, with the development of new energy vehicle technology (such as vehicles powered by electric motors), the increasing speed of electric motors, and the use of silicon carbide modules in electronic control systems, shaft voltage issues arise in the motor shaft. Specifically, when the motor is in operation, the common-mode shaft voltage and cyclic shaft voltage generated on the motor shaft, after accumulating for a period of time, pose a risk of breaking down the oil film at the bearing supporting the motor shaft and causing discharge. Furthermore, after multiple conductive discharges at the bearing, electrolytic corrosion damage will occur to the balls, inner ring, and outer ring of the bearing.

[0040] In related technologies, shaft voltage can be extracted using fiber conductive brushes or conductive carbon rods. However, conductive carbon rods and carbon brushes can produce conductive solid particles (such as powdered carbon powder) due to wear. These conductive solid particles pose a risk of entering the motor cavity, thus causing safety hazards on the high-voltage side of the motor bearings and windings.

[0041] During the operation of a motor, whenever an unbalanced magnetic flux links along the motor shaft, an induced electromotive force (EMF) is generated at both ends of the shaft; this induced EMF is the shaft voltage. In related technologies, when the shaft voltage reaches a certain value, a current is generated through a closed loop formed by the bearings and base, which is the shaft current.

[0042] According to an embodiment of this application, the motor 100 includes a housing assembly 1, a motor shaft 2, and a conductive base 3.

[0043] Reference Figure 1 and Figure 2 As shown, the housing assembly 1 includes a housing body 11 and an end cap 12. The end cap 12 is connected to one end of the housing body 11 in the axial direction, and the end cap 12 cooperates with the housing body 11 to form a motor cavity 101 extending along the motor axial direction. The end cap 12 also forms a support seat 121, and a bearing 5 is provided at the support seat 121. The motor shaft 2 passes through the motor cavity 101, and one end of the motor shaft 2 is supported on the bearing 5. The motor shaft 2 extends out of the bearing 5 on one side in the axial direction, and the portion of the motor shaft 2 extending out of the bearing 5 can further extend towards the conductive seat 3. The conductive seat 3 is mounted on the support seat 121. The end of the motor shaft 2 that extends out of the bearing 5 and the conductive seat 3 define a first cavity 602 in a direction parallel to the axial direction. The first cavity 602 is independent of the mounting space where the bearing 5 is located.

[0044] The conductive component 4 is disposed within the first cavity 601. The motor shaft 2, conductive component 4, conductive seat 3, and end cover 12 are sequentially electrically connected to each other, so as to realize the electrical connection between the motor shaft and the end cover 12 through the conductive component 4, thereby reducing the impact of shaft current on the bearing 5. The shaft voltage generated by the motor shaft 2 is transmitted through the motor shaft 2 to the conductive component 4, from the conductive component 4 to the conductive seat 3, and from the conductive seat 3 to the end cover 12, thus deriving the shaft voltage generated by the motor shaft 1.

[0045] Meanwhile, the conductive component 4 is arranged in the first cavity 602, thereby placing the conductive component 4 and the bearing 5 in two independent spaces. This prevents solid particles generated by wear of the conductive component 4 from entering the motor cavity 101 through the bearing 5, thus improving the protection effect on one side of the motor cavity 101.

[0046] According to the embodiment of the present application, the motor 100 has its motor shaft 2 electrically connected to the housing assembly 1 via a conductive component 4, a conductive seat 3, and an end cover 12. The conductive component 4 and conductive seat 3 guide the shaft current to the housing assembly 1, thereby protecting the bearing 5, reducing electro-corrosion damage to the bearing 5, extending its service life, and improving the stability and reliability of the motor 100 during operation. This prevents impurities in the motor cavity 101 from entering the conductive component 4 and causing wear and affecting its conductivity; it also prevents conductive solid particles (such as carbon powder) generated by the conductive component 42 from entering the motor cavity 101 and causing damage to the bearing 5 of the motor 1 or affecting high-voltage components, thus improving the motor's reliability.

[0047] In some embodiments of this application, the conductive seat 3 is provided with a groove on the side near the motor cavity 101, the end of the motor shaft 2 extends into the groove 31, and the outer peripheral wall of the motor shaft 2 is clearance-fitted with the inner peripheral wall of the groove 31, so that the motor shaft 2 and the conductive seat 3 together form the first cavity 602, which can realize that the first cavity 602 and the installation space where the bearing 5 is located are independent of each other.

[0048] Furthermore, the end cap 12 has a support seat 121 protruding on one side along the axial direction, so as to form an accommodating space suitable for arranging the bearing 5 at the support seat 121. One end of the motor shaft 2 is supported on the bearing 5 on the support seat 121, and a portion of the motor shaft 2 can extend through the support seat 121 along one side along the axial direction.

[0049] like Figure 2As shown, in some embodiments of this application, the outer peripheral wall of the support shaft section 21 and the inner peripheral wall of the groove 31 are in clearance fit, and the clearance size is L, satisfying the relationship: 0mm < L ≤ 0.1mm. Because the clearance size L is sufficiently small, the first cavity 602 forms a nearly closed (or completely closed) cavity. The first cavity 602 and the mounting space where the bearing 5 is located form two independent spaces. Solid particles in the first cavity 602 are unlikely to enter the mounting space where the bearing 5 is located through the clearance, thereby preventing solid particles from entering the motor cavity 101. In other embodiments, the clearance size L can also be adjusted according to actual assembly requirements.

[0050] It is understandable that the support shaft section 21 is supported on the bearing 5, and a gap is reserved between the support shaft section 21 and the inner peripheral wall of the groove 31 to prevent interference between the support shaft section 21 and the conductive seat 3, avoid wear caused by friction between the support shaft section 21 and the conductive seat 3, and help extend the service life of the motor shaft 2 and the conductive seat 3.

[0051] In other embodiments of this application, the support base 12 is provided with a central hole located between the bearing 5 and the conductive base 3. The central hole is clearance-fitted with the end of the motor shaft 2 that passes through the bearing 5, and the support base 12, the conductive base 3 and the end of the motor shaft 2 surround to form a first cavity 602.

[0052] The central hole of the support base 12 is used for the motor shaft 2 to pass through, and the clearance fit can leave a certain gap between the outer peripheral wall of the motor shaft 2 passing through the central hole and the inner peripheral wall of the central hole, thereby avoiding interference between the motor shaft 2 and the support base 12. The first cavity 602 can be formed by the support base 12, the conductive seat 3 and the support shaft section 21 in the motor shaft 2 that is fitted with the central hole. The first cavity 602 can be made independent from the installation space where the bearing 5 is located.

[0053] In some embodiments of this application, the support base 121 is provided with a second cavity 601 surrounding the motor shaft 2. The second cavity 601 faces and avoids the rotatable part of the bearing 5, and the second cavity 601 forms part of the installation space where the bearing 5 is located.

[0054] The second cavity 601 is provided in the axial direction of the motor and corresponds to the rotatable part of the bearing 5 (such as the inner ring 51, the ball 53, etc.). That is to say, the second cavity 601 is defined by the conductive seat 3, the bearing 5, the end cover 12 and the motor shaft 2 as a nearly closed (or completely closed) cavity, and the second cavity 601 is part of the installation space formed at the support seat 121 (i.e. the area for installing the bearing 5).

[0055] Combination Figure 1 and Figure 2As shown, it can be understood that in the axial direction of the motor 100, the conductive seat 3 is located on the outer side of the end cover 12 (i.e., the end cover 12 is away from the motor cavity 101), and the conductive seat 3 is fixedly connected to the end cover 12, allowing electrical conductivity between the conductive seat 3 and the end cover 12. The second cavity 601 is defined by the conductive seat 3, the bearing 5, the end cover 12, and the motor shaft 2 as a nearly closed (or completely closed) cavity, and the second cavity 601 is located on the side of the conductive seat 3 adjacent to the motor cavity 101 in the axial direction parallel to the motor 100.

[0056] Meanwhile, a groove 31 is formed at the conductive base 3 that opens to the side of the motor cavity 101, and the motor shaft 2 can extend into the conductive base 3 through the open end of the groove 31, and the end of the motor shaft 2 and the conductive base 3 together define the first cavity 602.

[0057] Combination Figure 1 and Figure 2 As shown, the first cavity 602 is part of the receiving space formed by the groove 31. That is to say, the deeper the motor shaft 2 extends into the conductive seat 3 along the axial direction, the smaller the axial dimension of the first cavity 602 formed at the conductive seat 3.

[0058] Reference Figure 1 and Figure 2 As shown, the conductive component 4 is disposed at the first cavity 602, and the conductive component 4 is electrically connected to the motor shaft 2 and the conductive seat 3 respectively, so that the motor shaft 2 can be electrically connected to the conductive seat 3 through the conductive component 4, and further connected and cooperated with the end cover 12 through the conductive seat 3, so as to realize the electrical connection and cooperation between the motor shaft 2 and the shell assembly 1.

[0059] In this application, the conductive component 4 is arranged in a first cavity 602 defined by the motor shaft 2 and the conductive seat 3, thereby providing reliable arrangement space for the conductive component 4 to ensure the reliability of the electrical connection between the motor shaft 2 and the conductive seat 3. It is understood that conductive component 4 may generate conductive solid particles due to wear during the rotation of the motor shaft 2. These solid particles can also be confined within the first cavity 602 to prevent them from entering one side of the motor cavity 101 and affecting the high-voltage components on that side. Simultaneously, retaining the conductive solid particles within the first cavity 602 enhances the conductive connection performance between the conductive seat 3, the conductive component 4, and the motor shaft 2.

[0060] In some embodiments of this application, the second cavity 601 and the first cavity 602 are arranged at intervals along the axial direction of the shell assembly 1, so that the first cavity 602 and the motor cavity 101 can be separated in the direction parallel to the axial direction by the second cavity 601, which increases the difficulty for solid particles to enter the second cavity 601 from the first cavity 602 and further enter the side of the motor cavity 101.

[0061] Reference Figure 1 and Figure 2 As shown, the second cavity 601 is formed on the side of the guide seat near the motor cavity 101 in the axial direction. The first cavity 602 is formed by the end of the motor shaft 2 extending into the groove 31 and cooperating with the guide seat. That is, the second cavity 601 and the first cavity 602 can communicate through the gap between the outer peripheral wall of the portion of the motor shaft 2 extending into the groove 31 and the inner peripheral wall of the groove 31 (but the gap can restrict the passage of toner or other impurity particles), and the distance between the second cavity 601 and the first cavity 602 in the axial direction is the same as the depth of the motor shaft 2 extending into the groove 31. That is, the deeper the motor shaft 2 extends into the groove 31, the greater the distance between the second cavity 601 and the first cavity 602 in the axial direction; the shallower the depth of the motor shaft 2 extending into the groove 31, the smaller the distance between the second cavity 601 and the first cavity 602 in the axial direction.

[0062] like Figure 2 As shown, in some embodiments of this application, the conductive component 4 includes a conductive element 41 and an electrical connector 42. The conductive element 41 is fixedly connected to the end of the motor shaft 2, so that the conductive element 41 can rotate synchronously with the motor shaft 2. The electrical connector 42 is disposed in the first cavity 602, and the electrical connector 42 is electrically connected to the conductive element 41 and the conductive seat 3 respectively, so as to realize the electrical connection between the conductive element 41 and the conductive seat 3 through the electrical connector 42.

[0063] It is understood that the conductive component 41 is conductive. After the conductive component 41 is connected and fixed to the motor shaft 2, the motor shaft 2 can drive the conductive component 41 to rotate synchronously relative to the housing assembly 1, and the current at the motor shaft 2 can be transmitted to the conductive component 41. Simultaneously, the electrical connector 42 is also conductive and is electrically connected to the conductive component 41. The electrical connector 42 is also electrically connected to the conductive base 3, thereby achieving electrical connection between the conductive component 41 and the conductive base 3, and avoiding direct contact between the conductive component 41 and the conductive base 3. The electrical connector 42 can be constructed as a carbon rod, which has good conductivity and can meet the electrical connection requirements between the conductive component 42 and the conductive base 3. In other embodiments, the electrical connector 42 can also be constructed as conductive fiber, conductive plastic, or conductive metal, or other conductive materials.

[0064] Furthermore, it can be understood that the conductive base 3 is fixedly connected to the end cover 12, and the conductive component 41 is fixedly connected to the motor shaft 2. If the conductive component 41 is directly in contact with the conductive base 3, it will cause a large friction at the electrical connection position between the conductive component 41 and the conductive base 3, affecting the service life of the conductive base 3 and the conductive component 41 and posing a safety hazard.

[0065] In this application, an electrical connector 42 is provided between the conductive element 41 and the conductive base 3. The electrical connector 42 can be electrically connected and engaged with the conductive element 41. Taking the abutting engagement between the electrical connector 42 and the conductive element 41 as an example, as long as the electrical connector 42 and the conductive element 41 remain in contact, the electrical connection and engagement between the conductive element 41 and the electrical connector 42 can be achieved. At the same time, the electrical connector 42, which is constructed as a carbon rod, has good lubricity and conductivity, which can ensure the effective electrical connection and engagement between the electrical connector 42 and the rapidly rotating conductive element 41.

[0066] like Figure 2 As shown, in some embodiments of this application, the end of the motor shaft 2 is provided with a mounting hole that is recessed into the motor cavity 101 in the axial direction, and the center of the mounting hole is on the central axis of the motor shaft 2. The mounting hole is used to install the conductive component 41, thereby improving the stability of the conductive component 41 as it rotates with the motor shaft 2.

[0067] In a further embodiment of this application, the conductive member 41 includes a first connecting segment 411 and a second connecting segment 412. The first connecting segment 411 is installed in the mounting hole and is coaxially arranged with the motor shaft 2. The second connecting segment 412 is coaxially connected to the first connecting segment 411 and is placed outside the mounting hole. The second connecting segment 412 is used for electrical connection with the electrical connector 42.

[0068] Specifically, the first connecting section 411 and the second connecting section 412 are both arranged coaxially with the motor shaft 2. When the motor shaft 2 rotates, the center linear velocity of the motor shaft 2 is zero, which can improve the rotational stability of the conductive component 41, so that the linear velocity of the contact fit position between the conductive component 41 and the electrical connector 42 is also zero, thereby ensuring the reliability of the contact fit between the conductive component 41 and the electrical connector 42.

[0069] like Figure 2 As shown, in some embodiments of this application, the end of the second connecting segment 412 is provided with a spherical end 414, which abuts against the end of the electrical connector 42, so that the second connecting segment 412 can achieve electrical connection through the abutting cooperation between the spherical end 414 and the electrical connector 42.

[0070] It is understandable that during the engagement of the conductive component 41 and the electrical connector 42, the conductive component 41 rotates relative to the electrical connector 42, which will cause wear at the electrical connector 42. This allows the relative position of the conductive component 41 and the electrical connector 42 in the axial direction to be adjusted so that the conductive component 41 and the electrical connector 42 are always kept in abutting engagement (i.e., electrical connection engagement).

[0071] As wear and tear occurs during the contact and mating of the electrical connector 42 and the conductive element 41, an arc-shaped surface will form on the electrical connector 42, with the arc-shaped opening facing the conductive element 41. The greater the depth of the concave arc-shaped surface, the larger the contact area between the conductive element 41 and the electrical connector 42 becomes, thereby increasing the mating area between them and ensuring their conductivity.

[0072] like Figure 2 As shown, in some embodiments of this application, the end of the conductive base 3 is formed with a receiving groove 32 that is recessed away from the motor shaft 2 and open to the motor shaft 2, and at least a portion of the electrical connector 42 extends into the receiving groove 32 to electrically connect with the conductive base 3. The electrical connector 42 and the conductive base 3 are inserted into the receiving groove 32, and the outer peripheral wall of the electrical connector 42 can contact the inner peripheral wall of the conductive base 3 in the receiving groove 32 to achieve electrical connection between the electrical connector 42 and the conductive base 3.

[0073] Furthermore, the conductive component 4 also includes an elastic element 43, which is disposed in the receiving groove 32 and elastically supported between the electrical connector 42 and the conductive base 3, so as to elastically support the electrical connector 42 and the conductive element 41 to maintain electrical connection and engagement.

[0074] It is understandable that the elastic element 43 is elastically supported between the conductive base 3 and the electrical connector 42. Under the elastic support of the elastic element 43, the electrical connector 42 has a tendency to move towards the conductive element 41, so that the electrical connector 42 can abut against the conductive element 41, ensuring the electrical connection effect between the electrical connector 42 and the conductive element 41.

[0075] Specifically, when the electrical connector 42 wears due to frictional contact between the conductive element 41 and the electrical connector 42, the electrical connector 42 can extend out of the receiving groove 32 (i.e., to the side of the conductive element 41) under the drive of the elastic element 43. This allows the electrical connector 42 to maintain contact with the conductive element 41, ensuring the electrical connection between them. Simultaneously, as the wear of the electrical connector 42 increases, an arc-shaped surface will form at the contact point with the conductive element 41, and the contact area between the spherical end 414 of the conductive element 41 and the electrical connector 42 will increase, thereby further improving the conductivity between the conductive element 41 and the electrical connector 42.

[0076] It should be noted that, taking the electrical connector 42 as an example of a carbon rod, the wear of the carbon rod 42 will generate carbon powder, which can remain in the first cavity 602, and some of the carbon powder can adhere to the conductive component 41, thereby further improving the conductive connection performance between the conductive component 41 and the carbon rod 42.

[0077] Reference Figure 2 As shown, the opening shape of the receiving groove 32 is adapted to the cross-sectional shape of the electrical connector 42, so that the inner peripheral wall of the receiving groove 32 can guide and cooperate with the outer peripheral wall of the electrical connector 42, thereby improving the stability of the outward extension action of the elastic member 43 driving the electrical connector 42. At the same time, in the axial direction projection, the projection of the spherical end 414 falls within the projection range of the electrical connector 42, thereby ensuring the reliability of the fit between the spherical end 414 and the electrical connector 42.

[0078] In some embodiments of this application, the elastic element 43 is constructed as a spring, which has good elastic properties, and the spring can be constructed as a metal part, making the spring conductive. That is to say, the electrical connector 42 can achieve electrical connection with the conductive seat 3 not only through contact and engagement with the peripheral wall of the receiving groove 32, but also through the spring, thereby ensuring the electrical connection and engagement effect between the electrical connector 42 and the conductive seat 3, and making the electrical connection and engagement between the electrical connector 42 and the conductive seat 3 more reliable.

[0079] In some embodiments of this application, the first connecting segment 411 is interference-fitted with the mounting hole, so that the first connecting segment 411 can be fixed to the end of the motor shaft 2 by plug-in installation, which is simple and highly reliable.

[0080] In some other embodiments of this application, the first connecting segment 411 is formed with an external thread, the mounting hole is formed with an internal thread, and the first connecting segment 411 is threadedly connected to the threaded hole, so that the first connecting segment 411 can be installed by screwing it into the mounting hole. The installation method is simple and highly reliable, and can effectively prevent the conductive component 41 from coming out of the mounting hole.

[0081] like Figure 2 As shown, in a further embodiment of this application, the second connecting segment 412 is provided with a limiting flange 413. The limiting flange 413 is used to limit the end of the motor shaft 2 so as to restrict the conductive element 41 from further extending into the mounting hole, thereby achieving the positioning between the conductive element 41 and the motor shaft 2.

[0082] Reference Figure 2 As shown, the limiting flange 413 protrudes outward in the radial direction from the second connecting section 412, and the radial dimension of the limiting flange 413 is greater than the radial dimension of the first shaft section, so that the limiting flange 413 can be limited and engaged with the end of the motor shaft 2 (i.e. the end face with the mounting hole) when the first connecting section 411 is installed in place.

[0083] like Figure 2As shown, in some embodiments of this application, a support shaft section 21 is formed at the end of the motor shaft 2, and a support base 121 is formed with a mounting platform that opens to the side of the motor cavity 101. The mounting platform is used to install the bearing 5, and the support shaft section 21 passes through and is supported on the bearing 5.

[0084] Combination Figure 1 and Figure 2 As shown, the mounting platform serves as the mounting carrier for the bearing 5, defining a mounting space for fixing the bearing 5 onto the housing assembly 1. Simultaneously, the bearing 5 supports the motor shaft 2, enhancing its stability during rotation.

[0085] The mounting platform is located at the opening of the support base 121 and extends radially inward from the opening of the support base 121 to form a stepped structure.

[0086] Reference Figure 1 and Figure 2 As shown, a support shaft section 21 is formed on the motor shaft 2. The radial dimension of the support shaft section 21 is smaller than that of the main body area of ​​the motor shaft 2 (i.e., Figure 1 and Figure 2 The radial dimension of the motor shaft 2 (excluding the support shaft section 21) is determined so that the support shaft section 21 can be inserted and supported on the bearing 5, and the motor shaft 2 and the bearing 5 can be positioned in a direction parallel to the axial direction.

[0087] Furthermore, the portion of the support shaft section 21 that extends from the bearing 5 can further extend from the end cap 12 and into the groove 31 of the conductive seat 3. The second cavity 601 is defined between the opening of the end cap 12, the outer peripheral wall of the support shaft section 21, the bearing 5 and the conductive seat 3, and the second cavity 601 is arranged in a ring around the support shaft section 21.

[0088] like Figure 2 As shown, in some embodiments of this application, the conductive base 3 has a connecting flange 33 at the open port of the groove 31. The connecting flange 33 is arranged in a ring around the motor shaft 2, and the connecting flange 33 is folded outward in the radial direction of the motor shaft 2 and connected to the support base 121. The bearing 5 is disposed opposite to the connecting flange 33 in the direction parallel to the axial direction, and the second cavity 601 is defined between the bearing 5 and the connecting flange 33.

[0089] Specifically, the bearing 5 abuts against the mounting platform on one side of its surface near the conductive seat 3 in the direction parallel to the axial direction, and the other side of its surface is opposite to the connecting flange 33 in the direction parallel to the axial direction. The area of ​​the support seat 121 with the mounting platform surrounds the circumferential outer side of the support shaft section 21, so that the bearing 5, the connecting flange 33, the mounting platform and the support shaft section 21 together define the second cavity 601 described above, and the second cavity 601 is located outside the conductive seat 3.

[0090] In some embodiments of this application, the connecting flange 33 can be connected and fixed to the end cap 12 by the connector 8.

[0091] Reference Figure 2 As shown, in the axial direction of the motor 100, the connecting flange 33 and the end cover 12 are respectively arranged opposite to each other. The connector 8 can pass through the connecting flange 33 and connect and cooperate with the connecting structure formed at the end cover 12 to fix the conductive seat 3 on the end cover 12. The installation method is simple and highly reliable.

[0092] Reference Figure 2 As shown, in some embodiments of this application, the bearing 5 is provided with a first bearing sealing cover 54 at one end near the motor cavity 101 in the direction parallel to the axial direction. The first bearing sealing cover 54 isolates the bearing 5 from the motor cavity 101 to prevent objects (such as heat exchange medium) on one side of the motor cavity 101 from entering the second cavity 601 through the bearing 5, thereby further improving the protection effect on the conductive component 4.

[0093] The first bearing seal cover 54 is disposed between the inner ring 51 and the outer ring 52 of the bearing 5, and the first bearing seal cover 54 can also be used to protect the balls 53 of the bearing 5 to prevent the lubricating oil in the bearing 5 from escaping and to ensure the bearing 5's support function.

[0094] Reference Figure 3 As shown, a second bearing seal cover 55 is formed at the end of the bearing 5 near the first cavity 602 in the axial direction parallel to the bearing 5. The second bearing seal cover 55 can prevent objects (such as cooling oil) on the side of the motor cavity 101 from entering the second cavity 601 through the bearing 5, making it difficult for cooling oil to enter the second cavity 601 through the bearing 5, thereby further improving the protection effect on the conductive component 4.

[0095] The second bearing seal cover 55 is disposed between the inner ring 51 and the outer ring 52 of the bearing 5, and is located on the side of the bearing 5 near the conductive seat 3. It is understood that cooling oil can be disposed on one side of the motor cavity 101, and the cooling oil in the motor cavity 101 can enter the bearing 5 to lubricate the bearing 5, while the second bearing seal cover 55 prevents the cooling oil from entering the second cavity 601.

[0096] It should be noted that the motor 100 can be configured as a water-cooled motor or an oil-cooled motor. The sealing structure at the bearing 5 (e.g., the first bearing seal cover 54 and the second bearing seal cover 55 mentioned above) can be configured according to the sealing and protection requirements of the motor 100 at the second cavity 601. For example... Figure 4 As shown, in some embodiments of this application, the motor 100 further includes a first sealing member 71, which is disposed in the second cavity 601 and forms an annular seal between the support base 121 and the motor shaft 2 to improve the sealing and protection effect at the second cavity 601. This prevents solid particles (such as toner) in the first cavity 602 from entering the second cavity 601, and also prevents foreign objects on one side of the motor cavity 101 from entering the first cavity 602 through the second cavity 601.

[0097] The first sealing element 71 can be constructed as a sealing ring, so that the shape of the first sealing element 71 matches the shape of the annular second cavity 601, ensuring the sealing effect of the first sealing element 71 in the second cavity 601.

[0098] like Figure 5 As shown, in some embodiments of this application, the motor 100 further includes a second seal 72, which is sandwiched between the inner peripheral wall of the groove 31 and the motor shaft 2 to form an annular seal between the motor shaft 2 and the conductive seat 3, and to form a seal on the communication path between the second cavity 601 and the first cavity 602, thereby effectively separating the second cavity 601 and the first cavity 602.

[0099] Furthermore, the conductive base 3 has a groove structure 34 formed on the inner peripheral wall of the groove 31. The groove structure 34 is used to accommodate the second sealing member 72 to position the second sealing member 72 and prevent the second sealing member 72 from moving, thereby ensuring the reliability of the seal formed at the second sealing member 72.

[0100] It should be noted that the motor 100 may be equipped with the first sealing element 71 and the second sealing element 72 mentioned above, thereby forming a multiple seal between the motor cavity 101 and the first cavity 602 through the first sealing element 71 and the second sealing element 72, thereby improving the protection effect of the motor 100 at the conductive component 4.

[0101] like Figure 1 As shown, in some embodiments of this application, the shell assembly 1 further includes a cover 13, which covers the end cap 12 and forms an installation cavity between the cover 13 and the end cap 12. The conductive seat 3 and the conductive component 4 are disposed in the installation cavity so as to shield and protect the conductive seat 3 by the cover 13, thereby preventing the conductive seat 3 from being exposed.

[0102] According to the second aspect of the present application, the vehicle includes the motor 100 described above. The motor 100 can be configured as a power unit (e.g., an electric motor) in the vehicle to output power, and the motor 100 can also be configured as a power generation unit (e.g., a generator 100) in the vehicle to recover kinetic energy and generate electricity.

[0103] The advantages of the vehicle according to the embodiments of this application compared to the prior art are the same as those of the motor 100 described above, and will not be repeated here.

[0104] In the description of this application, 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., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 a limitation of this application.

[0105] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0106] In the description of this application, "multiple" means two or more.

[0107] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0108] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric machine (100), characterized by include: The housing assembly (1) includes a motor cavity (101) extending along the motor axis and an end cap (12) disposed at one end of the motor cavity (101) along the axis. The end cap (12) forms a support seat (121) and the support seat (121) is provided with a bearing (5). The motor shaft (2) is disposed through the motor cavity (101), and one end of the motor shaft (2) is supported on the bearing (5) and extends out of the bearing (5) on one side in the axial direction. A conductive seat (3) is mounted on the support seat (121). The end of the motor shaft (2) that passes through the bearing (5) and the conductive seat (3) are defined in a direction parallel to the axial direction to form a first cavity (602). The first cavity (602) is independent of the installation space where the bearing (5) is located. The conductive component (4) is disposed in the first cavity (602), and the motor shaft (2), the conductive component, the conductive seat (3) and the end cap (12) are connected in sequence to conduct electricity.

2. The electric machine (100) of claim 1, characterized in that The conductive base (3) has a groove (31) on the side near the motor cavity (101). The end of the motor shaft (2) extends into the groove (31) and is in clearance fit with the inner peripheral wall of the groove (31) to form a first cavity (602) with the conductive seat (3).

3. The electric machine (100) of claim 2, characterized in that The gap dimension is L and satisfies the relationship: 0mm<L≤0.1mm.

4. The electric machine (100) of claim 1, characterized in that, The support base (121) is provided with a second cavity (601) surrounding the motor shaft (2). The second cavity (601) faces and avoids the rotatable part of the bearing (5). The second cavity (601) forms part of the installation space where the bearing (5) is located.

5. The electric machine (100) of claim 4, characterized in that The conductive base (3) has a connecting flange (33) at the open port of the groove (31). The connecting flange (33) is arranged in a ring around the motor shaft (2). The connecting flange (33) is folded outward in the radial direction of the motor shaft (2) and connected to the support base (121). The bearing (5) is disposed opposite to the connecting flange (33) in a direction parallel to the axial direction, and the second cavity (601) is defined between the bearing (5) and the connecting flange (33).

6. The electric machine (100) of claim 4, characterized in that The motor (100) further includes a first seal (71), which is disposed in the second cavity (601) and forms an annular seal between the support (121) and the motor shaft (2); And / or, the motor (100) further includes a second seal (72) sandwiched between the inner peripheral wall of the groove (31) and the motor shaft (2), forming an annular seal between the motor shaft (2) and the conductive seat (3).

7. The motor (100) according to claim 1, characterized in that, The support base (121) is provided with a central hole located between the bearing (5) and the conductive seat (3). The central hole is clearance-fitted with the end of the motor shaft (2) that passes through the bearing (5). The support base (121), the conductive seat (3) and the end of the motor shaft (2) enclose to form the first cavity (602).

8. The electric machine (100) of claim 1, characterized in that, The conductive component (4) includes: A conductive component (41) is fixedly connected to the end of the motor shaft (2); An electrical connector (42) is disposed within the first cavity (602) and is electrically connected to the conductive element (41) and the conductive base (3) respectively. The end of the conductive base (3) is formed with a receiving groove (32) that is recessed toward the side away from the motor shaft (2) and open toward the side of the motor shaft (2). At least part of the electrical connector (42) extends into the receiving groove (32) and is electrically connected to the conductive base (3). The conductive component (4) also includes an elastic member (43). The elastic member (43) is disposed in the receiving groove (32) and is elastically supported between the electrical connector (42) and the conductive base (3) to elastically support the electrical connector (42) and the conductive member (41) to maintain an electrical connection.

9. The electric machine (100) of claim 1, characterized in that, The bearing (5) has a first bearing seal cover (54) at one end near the motor cavity (101) in the direction parallel to the axial direction. The first bearing seal cover (54) is located between the inner ring (51) and the outer ring (52) of the bearing (5). The first bearing seal cover (54) isolates the bearing (5) from the motor cavity (101). And / or, the bearing (5) is provided with a second bearing seal cover (55) at one end near the first cavity (602) in the axial direction parallel to the bearing (5), the second bearing seal cover (55) is disposed between the inner ring (51) and the outer ring (52) of the bearing (5), and the second bearing seal cover (55) isolates the bearing (5) from the first cavity (602).

10. A vehicle characterized by comprising: Includes the motor (100) according to any one of claims 1-9.

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