Leading-out device and motor
By designing a lead-out device including conductive parts, electrical contact parts and paired electrical contact parts, the pitting problem caused by charge at the rotor shaft during motor operation is solved, effective export and protection of charge is achieved, and low manufacturing cost is achieved.
Patent Information
- Application Number
- CN202420629596.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During operation, existing motors generate shaft voltage at the rotor shaft, causing electrostatic charge to accumulate and form current paths through the bearings, causing pitting damage.
A lead device is designed, including a conductive member, an electrical contact member and a paired electrical contact member, which is electrically connected to the housing through a conductive member, the electrical contact member is electrically connected to the conductive member, the paired electrical contact member is electrically connected to the rotor shaft, and is tensioned axially between the electrical contact member and the rotor shaft, forming an electrical contact that can slide relative to each other to deduce the charge at the rotor shaft.
Effectively export the charge at the rotor shaft to protect bearings and other components from pitting damage. At the same time, due to the simple structure and small number of components, the manufacturing cost is low.
Smart Images
Figure CN222563619U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of vehicle technology and particularly to a derivation device and a motor. Background Art
[0002] In current electric machines, especially drive motors for electric vehicles or hybrid vehicles, shaft voltages are generated at the rotor shaft during operation for various reasons. In order to prevent static charges, especially those accumulated at the rotor shaft and the rotor support, from forming a current path via the bearings for supporting the rotor shaft, and thus protect the bearings and other components from pitting corrosion, a discharge device including a grounding carbon brush can be used. In addition, discharge devices are also commonly used in railway technology, where the current at the wheel axle is discharged with the help of the discharge device. Utility Model Content
[0003] The object of the present disclosure is to provide a derivation device solution with an improved structure, which has a simpler structure than the existing solutions and preferably has a lower manufacturing cost while ensuring the derivation function.
[0004] According to one aspect of the present disclosure, the above object is achieved by a discharge device for an electric motor, wherein the electric motor comprises a housing and a rotor, wherein the rotor is rotatable relative to the housing and has a rotor shaft, and the discharge device electrically connects the rotor shaft and the housing.
[0005] According to the present disclosure, the derivation device includes: a conductive member, which is fixedly arranged at the housing and electrically connected to the housing; an electrical contact member, which is fixedly arranged at the conductive member and electrically connected to the conductive member; a mating electrical contact member, which is constructed to have axial elasticity and is axially tensioned between the electrical contact member and the rotor shaft, wherein the mating electrical contact member is fixedly arranged at the rotor shaft and electrically connected to the rotor shaft, wherein the mating electrical contact member and the electrical contact member form an electrical contact that can slide relative to each other, so that the derivation device can guide the charge at the rotor shaft to the housing.
[0006] Here, the electric motor can be used in particular as a drive motor for driving an electric vehicle or a hybrid vehicle. The electric motor is preferably configured as an inner rotor radial motor. The electric motor basically comprises a housing, a stator and a rotor, wherein the housing forms a receiving space for receiving the stator and the rotor, the stator can be fixedly arranged relative to the housing in the receiving space, and the rotor is arranged radially inside the sleeve-shaped stator and can rotate relative to the housing and the stator. The output torque of the rotor is output via a rotor shaft, and the rotor shaft can be supported on the housing via a rolling bearing.
[0007] Within the scope of this document, unless otherwise specified, the terms “axial”, “radial” and “circumferential” are defined based on the rotation axis of the electric machine, ie the rotation axis of the rotor shaft.
[0008] The conductive element is preferably made of conductive metal. The conductive element is fixed to the housing and electrically connected to the housing. The first conductive element preferably directly contacts the housing, which is especially metal, to achieve electrical connection with the housing.
[0009] The electrical contact is preferably configured as a block. For example, the electrical contact is configured as a carbon brush. The electrical contact is basically made of a carbon-metal mixture, especially a mixture of graphite and a metal with high conductivity. Preferably, the electrical contact is doped with copper and silver ions.
[0010] The electrical contact and the conductive part are mechanically and electrically connected. Here, the electrical contact is welded to the conductive part, for example. Alternatively, the electrical contact and the conductive part can also be connected to each other by means of form fit and / or force fit. Thus, the electrical contact can be supported on the conductive part and then supported on the housing.
[0011] The mating electrical contact is made of a conductive material, preferably a conductive metal. The mating electrical contact has axial elasticity through its own structural design. Here, the mating electrical contact can adopt any known structural design as long as the tensioning force between the electrical contact and the rotor shaft can be achieved.
[0012] The mating electrical contact is mechanically and electrically connected to the rotor shaft. Here, the mating electrical contact is mounted on the axial end of the rotor shaft, for example, by a form fit and / or a force fit. Alternatively, the mating electrical contact can also be welded to the rotor shaft. As a result, the mating electrical contact can be supported on the rotor shaft and supported on the housing in a relatively rotatable manner together with the rotor shaft.
[0013] The electrical contact and the mating electrical contact form electrical contact that can slide relative to each other. Here, the electrical contact and the mating electrical contact are close to each other in the axial direction and can slide relative to each other. Since the electrical contact, the conductive member and the housing are electrically connected in turn through direct contact, and the mating electrical contact is electrically connected to the rotor shaft through direct contact, the charge on the rotor shaft can be conducted to the housing, thereby grounding.
[0014] The mating electrical contact is axially tensioned between the electrical contact and the rotor shaft, so that the electrical contact can always be closely attached to the mating electrical contact, thereby always stably conducting charges between the rotor shaft and the housing. For example, wear of the electrical contact during its service life can be compensated.
[0015] In addition, the mating electrical contact is particularly suitable for situations where the rotor shaft is constructed as a hollow shaft and thus has a small axial end surface area. In particular, in a scheme where the output device is arranged basically coaxially with the rotor shaft, a sufficient contact area for sliding contact of the power supply contact can be provided by means of the mating electrical contact electrically connected to the rotor shaft.
[0016] It can be seen that the export device according to the present disclosure has a simpler structure than the existing solutions while ensuring sufficient export function, and the number of components in the export device is smaller, thereby having a lower manufacturing cost.
[0017] In some preferred embodiments, the conductive member is configured as a circular disk made of conductive metal. Preferably, the conductive member is configured as a circular disk made of copper. Thus, the conductive member can provide sufficient support and conductive functions and has a lower cost.
[0018] Preferably, the lead-out device further comprises a bolt, wherein the housing has a stepped hole for accommodating the conductive member and the electrical contact member, the large diameter region of the stepped hole is at least partially configured with an internal threaded portion, the bolt is fixed at the internal threaded portion and presses the conductive member against the step of the stepped hole. Here, the lead-out device, in particular the conductive member and the electrical contact member, can be easily installed on the housing.
[0019] In some preferred embodiments, the electrical contact is configured as a carbon brush and forms a cylindrical body extending in the axial direction.
[0020] Preferably, the electric contact has a contact portion for sliding contact with the mating electric contact, wherein the contact portion is configured as a smooth convex surface, thereby ensuring stable contact between the electric contact and the mating electric contact when the contact portion is partially worn.
[0021] In some preferred embodiments, the mating electrical contact is constructed as a thin-walled disc made of a conductive metal, wherein the mating electrical contact comprises an elastic portion having axial elasticity and a mounting portion located radially outside the elastic portion. Here, the mating electrical contact is in the shape of a disc as a whole. By dividing the elastic portion and the mounting portion in terms of area, different functional requirements can be advantageously met.
[0022] Preferably, the elastic portion is configured as a thin-walled disc portion that bends toward the electrical contact. Advantageously, the thin-walled disc portion bends toward the electrical contact smoothly or in a wave-like manner. Thus, the elastic portion can provide axial elasticity through its own structure. It is understandable that the wall thickness of the elastic portion and the specific parameters of the above-mentioned bending structure can be adjusted according to actual needs, thereby adjusting the magnitude of the axial elasticity of the elastic portion, which is not limited in the present disclosure.
[0023] Here, preferably, a hole is provided in the elastic part. Here, the axial elasticity of the elastic part can be adjusted by means of the hole in the elastic part. At the same time, the hole in the elastic part can also advantageously reduce the weight of the component and realize a lightweight design of the outlet device. In addition, the hole in the elastic part can be used as an oil hole in some embodiments.
[0024] According to another aspect of the present disclosure, the above object is achieved by a motor. The motor includes: a housing; a stator and a rotor, wherein the stator can be fixedly arranged relative to the housing, and the rotor can rotate relative to the housing and the stator and has a rotor shaft; and a derivation device constructed in the above embodiment. The motor provided herein can derive the charge at the rotor shaft by means of the derivation device, thereby protecting components such as bearings from pitting corrosion, and the derivation device has a simplified structure and can reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Features, advantages, and technical effects of exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings.
[0026] Figure 1 It is a partial cross-sectional view of a motor in the lead-out device area according to an embodiment of the present disclosure.
[0027] Figure 2 is based on Figure 1 A three-dimensional view of the conductive member of the derivation device of an embodiment.
[0028] Figure 3 is based on Figure 1 A perspective view of the mating electrical contacts of the derivation device of an embodiment.
[0029] Figure 4 is based on Figure 3 Cross-sectional view of the mating electrical contact in the AA plane. DETAILED DESCRIPTION
[0030] Figure 1 It is a partial cross-sectional view of a motor in the lead-out device area according to an embodiment of the present disclosure.
[0031] The motor according to the present embodiment can be used in particular as a drive motor for driving an electric vehicle or a hybrid vehicle. The motor is constructed as an inner rotor radial motor. The motor includes a housing 6, a stator and a rotor. The housing 6 forms a receiving space for accommodating the stator and the rotor. The stator can be fixedly arranged in the receiving space relative to the housing 6. The rotor can be arranged radially inside the sleeve-shaped stator and can rotate relative to the housing 6 and the stator. The output torque of the rotor is output by means of a rotor shaft 4, and the rotor shaft 4 can be supported at the housing 6 by means of a rolling bearing 5. In the present embodiment, the metal housing 6 includes a metal end cover, and the end cover is constructed with a receiving hole that partially accommodates the output device. Here, the output device or a part of the components in the output device can be integrated at the end cover to form a preassembled component, and when assembling the motor, the installation of the output device can be completed at the same time as the end cover 6 is installed.
[0032] According to this embodiment, the lead-out device includes: a conductive member 1 , an electrical contact member 2 , and a mating electrical contact member 3 .
[0033] Figure 2 1 shows a perspective view of the conductive member 1. The conductive member 1 is made of conductive metal. Figure 1 and Figure 2 The conductive member 1 is configured as a circular disk made of conductive metal, preferably a copper circular disk. The conductive member 1 is fixedly disposed at the housing 6 and electrically connected to the housing 6. Specifically, the receiving hole of the end cover of the housing 6 is configured as a stepped hole, wherein the large diameter region of the stepped hole is at least partially configured with an internal threaded portion. By fixing the bolt 7 at the internal threaded portion, the conductive member 1 can be pressed against the step of the stepped hole, thereby achieving mechanical and electrical connection between the conductive member 1 and the end cover of the housing 6.
[0034] like Figure 1 As shown, the electrical contact 2 is constructed as a carbon brush. The electrical contact 2 is basically made of a carbon-metal mixture, especially a mixture of graphite and a metal with high conductivity. Preferably, copper and silver ions are doped in the electrical contact 2. In this embodiment, the electrical contact 2 is a columnar body extending in the axial direction. The electrical contact 2 is partially accommodated in the small diameter area of the stepped hole and is limited at the periphery by the small diameter area. The electrical contact 2 and the conductive member 1 are mechanically and electrically connected. In this embodiment, the electrical contact 2 is welded to the conductive member 1. As a result, the electrical contact 2 can be supported on the conductive member 1 and then supported on the housing 6.
[0035] Figure 3 A perspective view of the mating electrical contact 3 is shown. Figure 4 The corresponding mating electrical contact 3 is shown Figure 3 In the present embodiment, as shown in FIG. Figure 1 , Figure 3 and Figure 4 As shown, the mating electrical contact 3 is constructed as a thin-walled disk made of conductive metal and comprises an elastic portion 31 having axial elasticity and a mounting portion 33 located radially outside the elastic portion.
[0036] See especially Figure 1 and Figure 4In this embodiment, the elastic part 31 is configured as a thin-walled disc portion that bends toward the electrical contact 2. Here, the thin-walled disc portion of the elastic part 31, especially the radial middle area, bends from the rotor shaft 4 side toward the electrical contact 2 as a whole in the axial direction. Here, the thin-walled disc portion bends smoothly toward the electrical contact 2. As a result, the elastic part 31 can provide axial elasticity through its own structure. It can be understood that the wall thickness of the disc portion and the specific parameters of the above-mentioned bending structure can be adjusted according to the actual needs of the working conditions, thereby adjusting the size of the axial elasticity. Here, a hole 34 is provided in the elastic part 31. In this embodiment, the hole 34 is configured as a through hole. In other embodiments, the hole 34 can also be a blind hole. The size of the axial elasticity provided by the elastic part 31 can be adjusted by means of the hole 34 in the elastic part 31. For this purpose, the size and number of the holes 34 can be adaptively designed according to the axial elasticity required by the paired electrical contact. At the same time, the hole 34 in the elastic part 31 can also advantageously reduce the weight of the component and realize a lightweight design scheme of the derivation device. In addition, in some embodiments, the hole 34 in the form of a through hole can also be used as an oil hole.
[0037] The mating electrical contact 3 is fixedly arranged on the rotor shaft 4 by means of a mounting portion 33 and is electrically connected to the rotor shaft 4. Here, the mounting portion 33 is configured as a sleeve portion partially extending in the axial direction, and the axial end of the rotor shaft 4 is configured with an inner hole, and the sleeve portion is pressed against the hole wall of the inner hole of the rotor shaft 4 by interference fit or force fit, thereby the mating electrical contact 3 can be supported on the rotor shaft 4 and supported on the housing 6 so as to be relatively rotatable together with the rotor shaft 4.
[0038] The electrical contact 2 and the mating electrical contact 3 form an electrical contact that can slide relative to each other. Here, the contact portion of the electrical contact 2 and the contact area 32 of the mating electrical contact 3 are closely attached to each other in the axial direction and can slide relative to each other. Since the electrical contact 2, the conductive member 1 and the housing 6 are electrically connected in sequence, and the mating electrical contact 3 is electrically connected to the rotor shaft 4, the charge at the rotor shaft 4 can be conducted to the housing 6 and then grounded.
[0039] The mating electrical contact 3 is axially tensioned between the electrical contact 2 and the rotor shaft 4, and the electrical contact 2 can always be closely attached to the mating electrical contact 3, thereby always being able to stably conduct charges between the rotor shaft 4 and the housing 6. For example, the wear of the electrical contact 2 during its service life can be compensated thereby.
[0040] The mating electrical contact 3 is also particularly suitable for the case where the rotor shaft 4 is constructed as a hollow shaft and thus has a small axial end surface area. In particular, in the solution where the outlet device is arranged substantially coaxially with the rotor shaft, a sufficient contact area for the power supply contact 2 to slide in contact can be provided by means of the mating electrical contact 3 electrically connected to the rotor shaft 4.
[0041] With the help of the derivation device according to this embodiment, a sufficient derivation function is ensured while having a simpler structure than the existing solution, and the number of components in the derivation device is smaller, thereby having a lower manufacturing cost.
[0042] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation methods of the present disclosure. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the claims of the present disclosure.
[0043] Reference numerals list
[0044] 1 Conductive parts
[0045] 2 Electrical contacts
[0046] 3 Mating electrical contacts
[0047] 31 Elasticity
[0048] 32 Contact area
[0049] 33 Installation
[0050] 34 holes
[0051] 4 Rotor shaft
[0052] 5 Bearings
[0053] 6 Housing
[0054] 7 Bolts
Claims
1. A lead-out device for a motor, The motor comprises a housing (6) and a rotor, wherein: The rotor is rotatable relative to the housing and has a rotor shaft (4). Characterized in that the export device comprises: A conductive member (1) fixedly disposed on the housing (6) and electrically connected to the housing (6); An electrical contact (2) fixedly disposed on the conductive member (1) and electrically connected to the conductive member (1); A mating electrical contact (3) is constructed to have axial elasticity and is axially tensioned between the electrical contact (2) and the rotor shaft (4), wherein the mating electrical contact (3) is fixedly arranged on the rotor shaft (4) and electrically connected to the rotor shaft (4), wherein the mating electrical contact (3) and the electrical contact (2) form an electrical contact that can slide relative to each other, so that the derivation device can guide the charge on the rotor shaft (4) to the housing (6).
2. The derivation device according to claim 1, wherein: The conductive element (1) is constructed as a circular disk made of conductive metal.
3. The derivation device according to claim 1 or 2, wherein: The lead-out device further comprises a bolt (7), wherein the housing (6) has a stepped hole for accommodating the conductive member (1) and the electrical contact member (2), the large diameter region of the stepped hole being at least partially constructed with an internal threaded portion, the bolt (7) being fixed at the internal threaded portion and pressing the conductive member (1) against the step of the stepped hole.
4. The derivation device according to claim 1, wherein: The electrical contact (2) is constructed as a carbon brush and forms a cylindrical body extending in the axial direction.
5. The derivation device according to claim 1 or 4, wherein: The electrical contact (2) has a contact portion for sliding contact with the mating electrical contact (3), wherein the contact portion is configured as a smooth convex surface.
6. The derivation device according to claim 1, wherein: The mating electrical contact (3) is constructed as a thin-walled disc made of conductive metal, wherein the mating electrical contact (3) comprises an elastic portion (31) having axial elasticity and a mounting portion (33) located radially outside the elastic portion (31).
7. The derivation device according to claim 6, wherein: The elastic portion (31) is configured as a thin-walled disc portion that is bent toward the electrical contact (2).
8. The derivation device according to claim 7, wherein: The thin-walled disc portion is smoothly bent toward the electrical contact (2) or is wave-shaped bent toward the electrical contact (2).
9. The derivation device according to claim 6, wherein: The elastic portion (31) is provided with a hole (34).
10. A motor, comprising: Housing (6); A stator and a rotor, wherein the stator can be fixedly arranged relative to the housing (6), and the rotor can rotate relative to the housing (6) and the stator and has a rotor shaft (4); and A derivation device according to any one of claims 1 to 9.