Leading-out device and motor

Abstract

The utility model relates to a leading-out device for a motor and the motor. The leading-out device comprises a blind-hole-shaped accommodating cavity (11) formed by a shell (1) of the motor; the conductive part (3) is fixedly arranged in the accommodating cavity (11) and is in conductive contact with the shell (1); an electrical contact (4), which is electrically connected to the conductive element (3), and which can be in slidable electrical contact with the rotor shaft (2) of the electric machine or with a component that is in conductive contact with the rotor shaft (2) of the electric machine, such that the lead-out device can lead the electric charge at the rotor shaft (2) to the housing (1). The motor comprises: a housing (1); the stator can be fixedly arranged relative to the shell (1); a rotor capable of rotating relative to the housing (1) and the stator and having a rotor shaft (2); the utility model further discloses the guiding device.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology. Specifically, this disclosure relates to a discharge device and an electric motor. Background Technology

[0002] In current electric motors, especially drive motors used in electric or hybrid vehicles, shaft voltage can be generated at the rotor shaft due to various reasons during operation. To prevent static charges, especially those accumulated at the rotor shaft and rotor support, from forming a current path through the bearings supporting the rotor shaft, and thus protecting the bearings and other components from pitting corrosion, a discharge device including a grounded carbon brush can be used.

[0003] In some current grounding device designs, the conductive component for grounding is bolted to a threaded through-hole in the motor housing. Because the motor housing requires sealing, sealant or other methods must be applied to the bolted connection to prevent oil leakage. However, this bolted installation method and the subsequent necessary sealing result in complex manufacturing processes and high component costs. Utility Model Content

[0004] The purpose of this disclosure is to provide a discharge device with an improved structure, which simplifies assembly compared to existing solutions and preferably improves sealing performance. Preferably, the discharge device has a lower manufacturing cost while maintaining its discharge function.

[0005] According to one aspect of this disclosure, the above objective is achieved by a discharge device for an electric motor. The electric motor includes a housing and a rotor shaft rotatable relative to the housing, and the discharge device establishes a charge path between the rotor shaft and the housing.

[0006] According to this disclosure, the discharge device includes: a blind-hole-shaped receiving cavity formed by the housing; a conductive element, wherein the conductive element is fixedly disposed inside the receiving cavity and in conductive contact with the housing; and an electrical contact element, wherein the electrical contact element is electrically connected to the conductive element and is capable of forming an electrical contact with the rotor shaft or a component in conductive contact with the rotor shaft that is capable of sliding relative to each other, thereby enabling the discharge device to guide the charge at the rotor shaft to the housing.

[0007] Here, the motor is particularly suitable for use as a drive motor for electric or hybrid vehicles. The motor is preferably constructed as an internal rotor radial motor. The motor basically includes a housing, a stator, and a rotor, wherein the housing forms a receiving space for accommodating the stator and rotor, the stator being fixedly arranged relative to the housing within this receiving space, and the rotor being arranged radially inside the sleeve-shaped stator and capable of rotating relative to the housing and stator. The output torque of the rotor is output via a rotor shaft, which is supported at the housing by rolling bearings.

[0008] Within the scope of this document, unless otherwise stated, the terms “axial,” “radial,” and “circumferential” are defined based on the axis of rotation of the motor, i.e., the axis of rotation of the rotor shaft.

[0009] The blind-hole-shaped receiving cavity is preferably formed in the motor housing at a position axially aligned with the rotor shaft. Preferably, the receiving cavity is constructed as a blind hole arranged coaxially with the rotor shaft and having an integral cylindrical inner cavity.

[0010] The conductive element is preferably made of a conductive metal. The conductive element is fixed to the receiving cavity of the housing and makes conductive contact with the housing. Preferably, the conductive element directly contacts the housing, especially a metallic one, to achieve conductive contact with the housing.

[0011] The electrical contact is preferably constructed as a block. For example, the electrical contact is constructed as a carbon brush. The electrical contact is basically made of a mixture of carbon and metal, especially graphite, and a mixture of metals with high conductivity. Preferably, the electrical contact is doped with copper or silver ions. The electrical contact and the conductive element are electrically connected by a conductive element. Here, the electrical contact can be supported directly or indirectly by a housing.

[0012] Advantageously, the electrical contact and the rotor shaft form an electrical contact that allows them to slide relative to each other. Here, the electrical contact and the rotor shaft are axially close to each other and can slide relative to each other. Since the rotor shaft and the electrical contact are electrically connected through sliding contact, the electrical contact and the conductive element are electrically connected through a conductive element, and the conductive element is in conductive contact with the housing, a charge path from the rotor shaft to the housing is established. Therefore, the charge at the rotor shaft can be discharged to the housing and thus grounded.

[0013] Advantageously and alternatively, the electrical contacts and the components that make conductive contact with the rotor shaft, such as mating electrical contacts, form an electrical contact that can slide relative to each other. Here, the electrical contacts and the components that make conductive contact with the rotor shaft, such as mating electrical contacts, are axially close to each other and can slide relative to each other. Since the rotor shaft is in conductive contact with the mating electrical contacts, the mating electrical contacts are electrically connected to each other through sliding contact, the electrical contacts are electrically connected to the conductive elements through conductive elements, and the conductive elements are in conductive contact with the housing, thereby establishing a charge path from the rotor shaft to the housing. Therefore, the charge at the rotor shaft can be discharged to the housing and thus grounded.

[0014] Here, components such as electrical contacts and conductive parts can be easily installed in the housing cavity. In particular, the blind hole design of the cavity can effectively block oil, eliminating the need for additional sealing measures. This simplifies the assembly of the discharge device and improves the sealing performance. At the same time, the discharge device has a lower manufacturing cost while ensuring the discharge function.

[0015] In some preferred embodiments, the conductive element is made of a conductive metal and includes a circular disc-shaped section and a sleeve-shaped section extending axially from the radially outer end of the circular disc-shaped section, wherein the conductive element is press-fitted into the cavity at the sleeve-shaped section. Here, the conductive element provides sufficient support and conductivity while maintaining low cost. The press-fit allows for efficient installation at the cavity, avoiding bolted connections as in existing solutions, thus reducing assembly costs. Preferably, the conductive element is press-fitted into the bottom region of the cavity, resulting in a compact axial structure for the delivery device.

[0016] Preferably, the outer peripheral surface of the sleeve-shaped section of the conductive element is partially provided with a protrusion that protrudes radially outward. This allows the conductive element to be easily installed inside the receiving cavity, and the press-fit connection between the conductive element and the housing is more secure.

[0017] In some preferred embodiments, the discharge device further includes a guide with an axial through-hole, wherein the guide is axially partially disposed inside the receiving cavity and directly or indirectly fixed relative to the housing, wherein the electrical contact is constructed as a carbon brush and forms an axially extending column, the electrical contact being axially partially disposed radially inside the guide and guided by the inner circumferential surface of the guide. Here, the guide is preferably fixed to the inner circumferential surface of the sleeve-shaped section of the conductive element by press fit. Alternatively or supplementarily, the guide is preferably mounted to the inner circumferential surface of the receiving cavity of the housing by press fit. Particularly preferably, the guide can be made of plastic, thereby facilitating the lightweight design of the discharge device and reducing manufacturing costs. The electrical contact is guided or constrained by being partially housed in the guide, which facilitates stable sliding contact between the electrical contact and the rotor shaft or the component that makes conductive contact with the rotor shaft.

[0018] Preferably, the outer peripheral surface of the section of the guide member located outside the receiving cavity is provided with a flange that protrudes radially outward. Here, the flange can be continuously provided circumferentially on the outer peripheral surface of the guide member. Alternatively, multiple flanges distributed circumferentially can be provided on the outer peripheral surface of the guide member. The flange allows the guide member to be easily assembled to a predetermined installation position.

[0019] Preferably, the outlet device further includes a wire electrically connecting the electrical contact and the conductive element. Here, the flexibility of the wire advantageously does not impede the degree of freedom of movement of the electrical contact under certain operating conditions.

[0020] Advantageously, the discharge device also includes an axially elastic helical spring, which is axially tensioned between the guide and the electrical contact, with the wire located radially inside the helical spring. This allows the electrical contact to stably contact the rotor shaft or a component that makes conductive contact with the rotor shaft, thereby ensuring the stability of the charge path.

[0021] In some preferred embodiments, the discharge device further includes mating electrical contacts, which are fixedly disposed at the rotor shaft and electrically contact the rotor shaft. The mating electrical contacts form an electrical contact that allows them to slide relative to each other, thereby enabling the discharge device to guide the charge at the rotor shaft to the housing. Here, the mating electrical contacts are made of a conductive material, preferably a conductive metal. The mating electrical contacts are mechanically and electrically connected to the rotor shaft. Here, the mating electrical contacts are mounted on the axial end of the rotor shaft, for example, by form-fitting and / or force-fitting. Alternatively, the mating electrical contacts can also be welded to the rotor shaft. Thus, the mating electrical contacts can be supported at the rotor shaft and rotatably supported relative to the rotor shaft at the housing. The mating electrical contacts are particularly suitable when the rotor shaft is constructed as a hollow shaft, thereby having a small axial end face area. Especially in embodiments where the discharge device is substantially coaxial with the rotor shaft, sufficient contact area for sliding contact of the power supply contacts can be provided by means of the mating electrical contacts electrically connected to the rotor shaft.

[0022] Preferably, the mating electrical contacts are constructed to be axially elastic and axially tensioned between the electrical contacts and the rotor shaft. This embodiment can serve as an alternative or supplement to the above-described embodiment with a helical spring to ensure the stability of the charge path. The mating electrical contacts are axially elastic, for example, through their own structural design. Here, any known structural design can be used for the mating electrical contacts, as long as it can achieve the tension between the electrical contacts and the rotor shaft. Preferably, the mating electrical contacts are constructed as thin-walled disks made of conductive metal, wherein the mating electrical contacts include an elastic portion with axial elasticity and a mounting portion located radially outward of the elastic portion. Here, the mating electrical contacts are generally disk-shaped. By dividing the elastic portion and the mounting portion in a specific area, different functional requirements can be advantageously met. Here, advantageously, the elastic portion is constructed as a thin-walled disk portion that bends toward the electrical contacts. Further advantageously, the thin-walled disk portion bends smoothly toward the electrical contacts or bends toward the electrical contacts in a wavy manner. Thus, the elastic portion can provide axial elasticity through its own structure. It is understood that the wall thickness of the elastic part and the specific parameters of the aforementioned bending structure can be adjusted according to actual needs, thereby adjusting the magnitude of the axial elasticity of the elastic part. This disclosure does not limit this.

[0023] According to another aspect of this disclosure, the above objective is achieved by an electric motor. The motor includes: a housing; a stator that is fixedly disposed relative to the housing; a rotor that is rotatable relative to the housing and the stator and has a rotor shaft; and a discharge device constructed according to the above embodiment. The motor provided herein can discharge the charge at the rotor shaft by means of the discharge device, thereby protecting components such as bearings from pitting corrosion. The discharge device is easy to assemble and has improved sealing performance, and it also reduces costs. Attached Figure Description

[0024] The features, advantages, and technical effects of exemplary embodiments of the present disclosure will now be described with reference to the accompanying drawings.

[0025] Figure 1 This is a partial cross-sectional view of the motor in the output device region according to an embodiment of the present disclosure.

[0026] Figure 2 yes Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0027] Figure 1 This is a partial cross-sectional view of the motor in the output device region according to an embodiment of the present disclosure.

[0028] The motor according to this embodiment is particularly suitable for use as a drive motor for driving electric vehicles or hybrid vehicles. The motor is constructed as an internal rotor radial motor. The motor includes a housing 1, a stator, and a rotor. The housing 1 forms a receiving space for accommodating the stator and rotor. The stator can be fixedly arranged within this receiving space relative to the housing 1. The rotor can be arranged radially inside the sleeve-shaped stator and can rotate relative to the housing 1 and the stator. The output torque of the rotor is output via a rotor shaft 2, which is supported at the housing 1 by means of rolling bearings 5. In this embodiment, the metal housing 1 includes a metal end cap, which has a blind-hole accommodating cavity 11. The accommodating cavity 11 has an integrally cylindrical inner cavity and is formed at a position axially aligned with the rotor shaft 2. Here, the delivery device or a portion thereof can be integrated at the end cap to form a pre-assembled assembly, allowing the delivery device to be installed simultaneously with the end cap during motor assembly.

[0029] According to this embodiment, the discharge device includes: a conductive element 3, an electrical contact 4, a guide 5, a helical spring 6, a wire 7, and a mating electrical contact 8.

[0030] The conductive component 3 is made of a conductive metal, preferably copper. In this embodiment, reference is made to... Figure 1 The conductive element 3 includes a circular disc-shaped section and a sleeve-shaped section extending axially from the radially outer end of the circular disc-shaped section. See especially the section by... Figure 2The enlarged view shows that a protrusion 31 protruding radially outward is partially provided on the outer peripheral surface of the sleeve-shaped section of the conductive element 3. The conductive element 3 is press-fitted into the cavity 11, preferably in the bottom region of the cavity, at the sleeve-shaped section. Here, the conductive element 3 provides sufficient support and conductivity while maintaining low cost. The press-fit allows for efficient conductive contact installation of the conductive element 3 in the cavity 11, avoiding bolted connections as in existing solutions, thus reducing assembly costs. The asymmetrical design of the conductive element, with the protrusion 31, simplifies installation and provides a more secure press-fit connection between the conductive element 3 and the housing 1.

[0031] In this embodiment, the guide member 5 is made of plastic, which facilitates a lightweight design of the delivery device and reduces manufacturing costs. The guide member 5 is partially disposed axially inside the receiving cavity 11 and is directly or indirectly fixed relative to the housing 1. In this embodiment, as... Figure 1 As shown, the guide member 5 is press-fitted to the inner circumferential surface of the sleeve-shaped section of the conductive member 3. The guide member 5 has an axial through hole to accommodate the electrical contact member 4, the helical spring 6, and the wire 7, which are described in detail below. A radially protruding flange 51 is provided on the outer circumferential surface of the section of the guide member 5 located outside the receiving cavity 11. In this embodiment, multiple flanges 51 distributed circumferentially can be provided on the outer circumferential surface of the guide member 5. With the help of the flanges 51, the guide member 5, or the guide member 5 and the components housed therein, can be easily assembled to a predetermined installation position using tooling.

[0032] like Figure 1 As shown, the electrical contact 4 is constructed as a carbon brush. The electrical contact 4 is essentially made of a mixture of carbon and metal, particularly graphite, and a mixture of highly conductive metals. Preferably, the electrical contact 4 is doped with copper or silver ions. In this embodiment, the electrical contact 4 is a columnar body extending axially. The electrical contact 4 is partially disposed radially inside the guide 5 and guided by the inner circumferential surface of the guide 5. The electrical contact 4 achieves electrical connection with the conductive element 3 via a wire 7.

[0033] like Figure 1As shown, the mating electrical contact 8 is constructed as a thin-walled disk made of conductive metal. The mating electrical contact 8 includes an axially elastic portion 81 and a mounting portion 81 located radially outward of the elastic portion. The mating electrical contact 8 is fixedly mounted on the rotor shaft 2 by means of the mounting portion 81 and is electrically connected to the rotor shaft 2. Here, the mounting portion 81 is constructed as a sleeve portion extending partially axially. The axial end of the rotor shaft 2 has an inner hole, and the sleeve portion is pressed against the wall of the inner hole of the rotor shaft 2 by an interference fit or press fit. Thus, the mating electrical contact 8 can be supported on the rotor shaft 2 and rotatably supported on the housing 1 together with the rotor shaft 2.

[0034] Electrical contact 4 and mating electrical contact 8 form an electrical contact that can slide relative to each other. Here, the contact portion of electrical contact 4 and the contact area of ​​mating electrical contact 8 are axially close to each other and can slide relative to each other.

[0035] Here, since the rotor shaft 2 is in conductive contact with the mating electrical contact 8, the mating electrical contact 8 and the electrical contact 4 are electrically connected through sliding contact, the electrical contact 4 and the conductive element 3 are electrically connected through the wire 7 and the conductive element 3 is in conductive contact with the housing 1, thereby establishing a charge path from the rotor shaft 2 to the housing 1. Therefore, the charge at the rotor shaft 2 can be discharged to the housing 1 and then grounded.

[0036] Furthermore, the helical spring 6 has axial elasticity and is axially tensioned between the guide 5 and the electrical contact 4, with the wire 7 located radially inside the helical spring. This allows the electrical contact 4 to stably contact the mating electrical contact 8, thereby ensuring the stability of the charge path and, in particular, compensating for wear of the electrical contact 4 during its service life.

[0037] The mating electrical contact 8 is particularly suitable for cases where the rotor shaft 2 is constructed as a hollow shaft and thus has a small axial end face area. Especially in schemes where the output device is basically coaxial with the rotor shaft 2, sufficient contact area for the sliding contact of the power supply contact 4 can be provided by means of the mating electrical contact 8 which is electrically connected to the rotor shaft 2.

[0038] Here, components such as electrical contacts and conductive parts can be easily installed in the housing cavity. In particular, the blind hole design of the cavity can effectively block oil, eliminating the need for additional sealing measures. This simplifies the assembly of the discharge device and improves the sealing performance. At the same time, the discharge device has a lower manufacturing cost while ensuring the discharge function.

[0039] Obviously, the above embodiments of this disclosure are merely examples for clear illustration and are not intended to limit the implementation of this disclosure. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of the claims of this disclosure.

[0040] List of reference numerals

[0041] 1. Shell

[0042] 11. Reception Department

[0043] 2. Rotor shaft

[0044] 3. Conductive components

[0045] 31. Protrusion

[0046] 4 Electrical contacts

[0047] 5. Guide components

[0048] 51 Edge band

[0049] 6. Coil springs

[0050] 7. Wires

[0051] 8. Paired electrical contacts

[0052] 81 Elastic part

[0053] 82 Installation Department

Claims

1. A discharge device for an electric motor, the electric motor comprising a housing (1) and a rotor shaft (2) rotatable relative to the housing (1), Its features are, The export device includes: A blind-hole shaped receiving cavity (11) formed by the shell (1); Conductive element (3), wherein the conductive element (3) is fixedly disposed inside the receiving cavity (11) and is in conductive contact with the housing (1); An electrical contact (4) is provided, wherein the electrical contact (4) is electrically connected to the conductive element (3), and the electrical contact (4) is capable of forming an electrical contact with the rotor shaft (2) or with a component that is in conductive contact with the rotor shaft (2) and is capable of sliding relative to each other, thereby the discharge device is capable of guiding the charge at the rotor shaft (2) to the housing (1).

2. The export device according to claim 1, wherein, The conductive element (3) is made of conductive metal and includes a circular disc-shaped section and a sleeve-shaped section extending axially from the radially outer end of the circular disc-shaped section, wherein the conductive element (3) is fixed inside the receiving cavity (11) at the sleeve-shaped section by press fitting.

3. The export device according to claim 2, wherein, The outer peripheral surface of the sleeve-shaped section is locally provided with a protrusion (31) that protrudes radially outward.

4. The export device according to claim 1, wherein, The discharge device further includes a guide (5) with an axial through hole, wherein the guide (5) is partially disposed axially inside the receiving cavity (11) and is fixedly disposed directly or indirectly relative to the housing (1), wherein the electrical contact (4) is constructed as a carbon brush and forms a columnar body extending axially, the electrical contact (4) is partially disposed axially inside the radial side of the guide (5) and guided by the inner circumferential surface of the guide (5).

5. The export device according to claim 4, wherein, The guide member (5) has a flange (51) that protrudes radially outward on the outer peripheral surface of the section located outside the receiving cavity (11).

6. The export device according to claim 4, wherein, The discharge device also includes a wire (7) that electrically connects the electrical contact (4) to the conductive element (3).

7. The exporting device according to claim 6, wherein, The outlet device further includes an axially elastic helical spring (6), wherein the helical spring (6) is axially tensioned between the guide (5) and the electrical contact (4), and the wire (7) is located radially inside the helical spring (6).

8. The exporting device according to claim 1, wherein, The discharge device further includes a mating electrical contact (8), wherein the mating electrical contact (8) is fixedly disposed at the rotor shaft (2) and makes conductive contact with the rotor shaft (2), and the mating electrical contact (8) and the electrical contact (4) form an electrical contact that can slide relative to each other, so that the discharge device can guide the charge at the rotor shaft (2) to the housing (1).

9. The exporting device according to claim 8, wherein, The mating electrical contact (8) is configured to be axially elastic and axially tensioned between the electrical contact (4) and the rotor shaft (2).

10. An electric motor, comprising: Shell (1); The stator is fixedly disposed relative to the housing (1); A rotor, which is rotatable relative to the housing (1) and the stator and has a rotor shaft (2); and The export device according to any one of claims 1 to 9.

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