Carbon brush holder for driving motor of electric vehicle

Abstract

The utility model relates to a carbon brush holder for a driving motor of an electric vehicle, a main body of the carbon brush holder consists of an outer shell and a carbon brush group, the carbon brush group is fixed in the outer shell and comprises a brush box with an arch structure, an elastic piece and a carbon brush matched with the brush box, and the carbon brush is provided with a special clamping groove design and is matched with an elastic tongue piece on the arch structure; the elastic piece is arranged at one end of the carbon brush and provides pressing force for the carbon brush, and the design not only simplifies installation steps, reduces maintenance cost and errors, but also improves durability and electrical contact stability.

Description

Technical Field

[0001] The utility model relates to a carbon brush holder for an electric vehicle drive motor. Background Art

[0002] The carbon brush holder of an electric vehicle drive motor is an indispensable and extremely crucial component in the motor system. It is installed inside the motor and forms an axial current path through the contact between the carbon brush and the motor shaft. When the motor is working, the carbon brush releases the axial current to the motor housing through the motor bearing.

[0003] At present, most of the existing engines on the market need to install the motor housing and the brush holder separately during the installation process. After the motor housing is installed with the motor shaft, the brush holder can be installed, resulting in low installation efficiency and unnecessary trouble for the staff.

[0004] Therefore, a carbon brush holder for an electric vehicle drive motor is needed, which can complete the installation of all structures at one time. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the above-mentioned deficiencies of the prior art and provide a carbon brush holder for an electric vehicle drive motor that is convenient for assembly. This purpose of the utility model is achieved as follows:

[0006] A carbon brush holder for an electric vehicle drive motor includes an outer housing and a carbon brush set. The carbon brush set is fixedly arranged on the outer housing. The carbon brush set includes an elastic member, a brush box, and a carbon brush. The brush box is provided with an arched structure. The carbon brush is arranged inside the arched structure. A slot is provided on the carbon brush. An elastic tongue is provided on the arched structure. The elastic tongue includes a narrow part and a wide part. The wide part is connected to the arched structure through the narrow part. A protruding part is provided on the wide part. The protruding part is in fit connection with the slot. The elastic member is arranged at one end of the carbon brush.

[0007] The arched structure is further provided with a first extension plate and a second extension plate extending to both sides. Mounting holes are respectively provided on the first extension plate and the second extension plate. A first mounting member is provided on the first extension plate. The wire led out from the carbon brush is fixed through the first mounting member. A second mounting member is provided on the second extension plate. The elastic member is fixed on the second mounting member. The elastic member contacts the carbon brush through a limiting part arranged at the end. The elastic member is a torsion spring. The first extension plate and the second extension plate on both sides of the arched structure are equipped with mounting holes, effectively optimizing the structural design, ensuring the fixation of the wire and the installation of the elastic member. The elastic member is a torsion spring, enhancing the pressure of the limiting member on the carbon brush and achieving a better fixation effect.

[0008] Furthermore, a wire outlet groove is provided at the connection between the first extension plate and the arched structure, the wire is arranged in the wire outlet groove, a limiting groove is provided at the connection between the second extension plate and the arched structure, and the limiting part of the elastic member is arranged in the limiting groove.

[0009] Furthermore, the protruding part is a convex structure or a folding structure.

[0010] Furthermore, the convex structure is bent downward from the wide part to the narrow part, and has a rotation angle of at least 10 degrees downward.

[0011] Furthermore, the folding structure is bent downward from the narrow part to the wide part, and has a rotation angle of 70-90 degrees downward.

[0012] In order to better install the brush box on the outer shell, the mounting hole protrudes downward.

[0013] In order to obtain a better bending effect, the width of the narrow part is 1-1.5 mm, and the width of the wide part is 2.3-3 mm.

[0014] Furthermore, the material of the outer shell is aluminum alloy.

[0015] Furthermore, the material of the brush box is brass.

[0016] Beneficial effects: Enabling users to complete the installation of all structural components at one time, simplifying the assembly process, improving the assembly efficiency, ensuring the uniformity of the carbon brush pressure and the stability of the structure, while reducing the maintenance time and assembly errors, and enhancing the durability and the stability of electrical contact. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of installing a single carbon brush holder of a carbon brush holder for an electric vehicle drive motor in Embodiment 1;

[0018] Figure 2 is a top-view perspective schematic diagram of installing a single carbon brush holder of a carbon brush holder for an electric vehicle drive motor in Embodiment 1;

[0019] Figure 3 is a three-dimensional structural schematic diagram of installing multiple carbon brush holders of a carbon brush holder for an electric vehicle drive motor in Embodiment 1;

[0020] Figure 4 is a three-dimensional structural schematic diagram of a carbon brush holder for an electric vehicle drive motor in Embodiment 1;

[0021] Figure 5 is a three-dimensional structural schematic diagram of another perspective of a carbon brush holder for an electric vehicle drive motor in Embodiment 1;

[0022] Figure 6 is an exploded schematic view of a carbon brush holder for an electric vehicle drive motor in the first embodiment;

[0023] Figure 7 is a schematic view of the top view perspective of a carbon brush holder for an electric vehicle drive motor in the first embodiment;

[0024] Figure 8 is a schematic view of the bottom view perspective of a carbon brush holder for an electric vehicle drive motor in the first embodiment;

[0025] Figure 9 (a) is a schematic view of the front perspective of the brush box of the carbon brush holder for an electric vehicle drive motor in the first embodiment; (b) is a sectional view of (a); (c) is a sectional view of the carbon brush after the carbon brush is installed in the carbon brush holder for an electric vehicle drive motor in the first embodiment;

[0026] Figure 10 (a) is a schematic view of the front perspective of the brush box of the carbon brush holder for an electric vehicle drive motor in the second embodiment; (b) is a sectional view of (a); (c) is a sectional view of the carbon brush after the carbon brush is installed in the carbon brush holder for an electric vehicle drive motor in the second embodiment;

[0027] Figure 11 is a schematic sectional structure view of the carbon brush holder for an electric vehicle drive motor in the first embodiment before installation;

[0028] Figure 12 is a schematic sectional structure view of the carbon brush holder for an electric vehicle drive motor in the first embodiment after installation;

[0029] In the figure: 101, outer housing; 102, carbon brush set; 1, elastic tongue; 1-1, protrusion; 1-2, wide part; 1-3, narrow part; 2, brush box; 3, elastic member; 4, carbon brush; 5, card slot; 6, limiting part; 7, limiting groove; 8, first extension plate; 9, second extension plate; 10, first mounting member; 11, second mounting member; 12, wire outlet groove; 13, mounting hole; 14, motor shaft. Detailed implementation manners

[0030] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0031] Embodiment 1: Please refer to Figures 1-12, A carbon brush holder for an electric vehicle drive motor, comprising a housing 101 and a carbon brush set 102. The carbon brush set 102 is fixedly arranged on the housing 101. The carbon brush set 102 includes an elastic member 3, a brush box 2 and a carbon brush 4. The brush box 2 is provided with an arched structure. The carbon brush 4 is arranged within the arched structure. A card slot 5 is provided on the carbon brush 4. An elastic tongue piece 1 is provided on the arched structure. The elastic tongue piece 1 includes a narrow part 1-3 and a wide part 1-2. The wide part 1-2 is connected to the arched structure through the narrow part 1-3. A protruding part 1-1 is provided on the wide part 1-2. The protruding part 1-1 is in mating connection with the card slot 5. The elastic member 3 is arranged at one end of the carbon brush 4.

[0032] The arched structure is further provided with a first extension plate 8 and a second extension plate 9 extending to both sides. Mounting holes 13 are respectively provided on the first extension plate 8 and the second extension plate 9. A first mounting member 10 is provided on the first extension plate 8. The wire led out from the carbon brush 4 is fixed through the first mounting member 10. A second mounting member 11 is provided on the second extension plate 9. The elastic member 3 is fixed on the second mounting member 11. The elastic member 3 contacts the carbon brush 4 through a limiting part 6 provided at the end. The elastic member 3 is a torsion spring. Figures 1-2 For a single carbon brush set 102 product, the advantages are low cost, small hysteresis torque on the motor shaft 14, and extremely small power consumption loss; the disadvantage is slightly poor tolerance to shaft runout. Figure 3 , For a multi-carbon brush assembly product, the advantages are strong tolerance to shaft runout and stable and reliable operation; the disadvantage is relatively high cost.

[0033] A wire outlet groove 12 is provided at the connection between the first extension plate 8 and the arched structure. The wire is arranged within the wire outlet groove 12. A limiting groove 7 is provided at the connection between the second extension plate 9 and the arched structure. The limiting part 6 of the elastic member 3 is arranged within the limiting groove 7. The protruding part 1-1 is a convex structure. The convex structure is bent downward from the direction of the wide part 1-2 to the narrow part 1-3, and has a rotation angle of at least 10 degrees downward. The width of the narrow part 1-3 is 1 - 1.5 mm, and the width of the wide part 1-2 is 2.3 - 3 mm. The material of the housing 101 is aluminum alloy, and the material of the brush box 2 is brass.

[0034] Embodiment 2: Please refer to Figure 10 , A carbon brush holder for an electric vehicle drive motor, comprising a housing 101 and a carbon brush set 102. The carbon brush set 102 is fixedly arranged on the housing 101. The carbon brush set 102 includes an elastic member 3, a brush box 2 and a carbon brush 4. The brush box 2 is provided with an arched structure. The carbon brush 4 is arranged within the arched structure. A card slot 5 is provided on the carbon brush 4. An elastic tongue piece 1 is provided on the arched structure. The elastic tongue piece 1 includes a narrow part 1-3 and a wide part 1-2. The wide part 1-2 is connected to the arched structure through the narrow part 1-3. A protruding part 1-1 is provided on the wide part 1-2. The protruding part 1-1 is in mating connection with the card slot 5. The elastic member 3 is arranged at one end of the carbon brush 4.

[0035] The arched structure is also provided with a first extension plate 8 and a second extension plate 9 extending to both sides. Mounting holes 13 are respectively provided on the first extension plate 8 and the second extension plate 9. A first mounting member 10 is provided on the first extension plate 8, and the wire led out from the carbon brush 4 is fixed through the first mounting member 10. A second mounting member 11 is provided on the second extension plate 9, and the elastic member 3 is fixed on the second mounting member 11. The elastic member 3 contacts the carbon brush 4 through the limiting portion 6 provided at the end. The elastic member 3 is a torsion spring, as Figures 1-2 The single-carbon brush assembly product has the advantages of low cost, small hysteresis torque on the motor shaft 14, and extremely small power consumption loss; the disadvantage is that its tolerance to shaft runout is slightly poor; as Figure 3 , the multi-carbon brush group 102-piece product has the advantages of strong tolerance to shaft runout and stable and reliable operation; the disadvantage is that the cost is relatively high.

[0036] A wire outlet groove 12 is provided at the connection between the first extension plate 8 and the arched structure, and the wire is arranged in the wire outlet groove 12. A limiting groove 7 is provided at the connection between the second extension plate 9 and the arched structure, and the limiting portion 6 of the elastic member 3 is arranged in the limiting groove 7. The protruding portion 1-1 is a folding structure, and the folding structure has a rotation angle of 70-90 degrees downward. The mounting hole 13 protrudes downward. The width of the narrow portion 1-3 is 1-1.5 mm, and the width of the wide portion 1-2 is 2.3-3 mm. The material of the outer housing 101 is aluminum alloy, and the material of the brush box 2 is brass.

[0037] Implementation example:

[0038] When this grounding brush holder product works, the elastic member 3 installed on the brush box 2 provides a working pressing force for the carbon brush 4, presses the carbon brush 4 on the motor shaft 14 and keeps good contact with the motor shaft 14. The carbon brush 4 is connected and fixed to the brush box 2 through the multi-strand copper braided wire on it. The brush box 2 is connected and fixed to the outer housing 101 by means of riveting, etc. The outer housing 101 is connected and fixed to the motor housing by means of interference press-fitting. Through the above connection and fixing methods, this brush holder product effectively forms a grounding conductive path from the motor shaft 14 to the motor housing, thereby realizing its function of grounding and conducting electricity.

[0039] Please refer to Figures 11-12, an elastic tongue piece 1 is designed at the middle position of the upper part of the brush box 2. There is a protruding locking structure at the front end of the tongue piece, and there is a narrow part 1-3 with a smaller width at the root of the tongue piece to weaken the strength so that the tongue piece is easy to deform at this position during the release process; before the installation of the motor shaft 14, the elastic tongue piece 1 is in a straight state, and the protruding part 1-1 on it is matched with the card slot 5 on the carbon brush 4 to block the carbon brush 4 and keep it inside the brush box 2, ensuring that the customer will not hit the carbon brush 4 during the installation of the motor shaft 14; when the customer installs the motor shaft 14, since the diameter of the installation position of the elastic tongue piece 1 is smaller than the diameter of the motor shaft 14, the motor shaft 14 will contact and push the tongue piece, causing the tongue piece to produce a flipping deformation along the weakened position at its root. When the deformation amount reaches a certain level, the protruding structure on the tongue piece will disengage from the card slot 5 of the carbon brush 4, thereby releasing the carbon brush 4. The carbon brush 4 will slide forward to the working position under the spring force of the elastic member 3 installed at its rear part and contact the motor shaft 14 to achieve the use function.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A carbon brush holder for an electric vehicle drive motor, characterized in that, It includes a housing and a carbon brush set. The carbon brush set is fixedly arranged on the housing. The carbon brush set includes an elastic member, a brush box, and a carbon brush. The brush box is provided with an arched structure. The carbon brush is arranged within the arched structure. A card slot is provided on the carbon brush. An elastic tongue is provided on the arched structure. The elastic tongue includes a narrow portion and a wide portion. The wide portion is connected to the arched structure through the narrow portion. A protruding portion is provided on the wide portion. The protruding portion is in mating connection with the card slot. The elastic member is arranged at one end of the carbon brush; The arched structure is further provided with a first extension plate and a second extension plate extending towards both sides. Mounting holes are respectively provided on the first extension plate and the second extension plate. A first mounting member is provided on the first extension plate. The wire led out from the carbon brush is fixed through the first mounting member. A second mounting member is provided on the second extension plate. The elastic member is fixed on the second mounting member. The elastic member contacts the carbon brush through a limiting portion provided at the end. The elastic member is a torsion spring.

2. The carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, A wire outlet groove is provided at the connection between the first extension plate and the arched structure. The wire is arranged within the wire outlet groove. A limiting groove is provided at the connection between the second extension plate and the arched structure. The limiting portion of the elastic member is arranged within the limiting groove.

3. A carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, The protruding portion is a convex structure or a folded structure.

4. A carbon brush holder for an electric vehicle drive motor according to claim 3, characterized in that, The convex structure is bent downward in the direction from the wide portion to the narrow portion, and has a rotation angle of at least 10 degrees downward.

5. A carbon brush holder for an electric vehicle drive motor according to claim 3, characterized in that, The folded structure is bent downward in the direction from the narrow portion to the wide portion, and has a rotation angle of 70 - 90 degrees downward.

6. The carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, The mounting holes protrude downward.

7. A carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, The width of the narrow portion is 1 - 1.5 mm, and the width of the wide portion is 2.3 - 3 mm.

8. A carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, The material of the housing is aluminum alloy.

9. The carbon brush holder for an electric vehicle drive motor according to claim 1, characterized in that, The material of the brush box is brass.

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