A carbon brush positioning assembly and a motor carbon brush holder thereof
By introducing a carbon brush positioning component and guide groove into the motor carbon brush holder, combined with the design of the inductor coil, the problems of unstable contact between the carbon brush and the commutator and poor heat dissipation are solved, achieving stable contact and efficient heat dissipation of the carbon brush, thereby improving the operating performance of the motor and the durability of the carbon brush.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG COLLIER AUTOMOBILE MOTOR CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-06-19
AI Technical Summary
The existing motor brush holders have unstable contact between the carbon brushes and the commutator during rotor rotation, and the heat dissipation effect is poor, which makes the carbon brushes easy to burn out and increases the cost of motor heat dissipation.
A carbon brush positioning assembly was designed, including a carbon brush sleeve, a positioning plate, a coil spring, a carbon brush guide post, and an inductor coil. The positioning plate and coil spring stabilize the position of the carbon brush, the guide groove and heat dissipation groove promote heat dissipation, and the inductor coil provides auxiliary support and filtering to ensure stable contact between the carbon brush and the commutator and rapid heat dissipation.
This achieves stable contact between the carbon brush and the commutator, reduces the energy loss and wear of the carbon brush, extends its service life, reduces heat dissipation costs, and improves the motor's operating efficiency and overload capacity.
Smart Images
Figure CN224385214U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor accessories technology, and in particular to a carbon brush positioning component and its motor carbon brush holder. Background Technology
[0002] Carbon brushes contact the commutator on the motor rotor via a contact contact method, and the rotor rotates when the carbon brushes are energized. During rotor rotation, frictional heat is generated between the carbon brushes and the commutator, which can easily burn out the carbon brushes if not dissipated in time. Chinese utility model patent CN217087092U discloses a novel motor carbon brush holder, including an annular carbon brush base with two symmetrically arranged carbon brush sleeves on the base, each sleeve containing a carbon brush. A concave guide rail is provided inside the carbon brush sleeve, and a guide bar is placed within the concave guide rail, fixed to the carbon brush. This reduces the contact area between the inner wall of the carbon brush sleeve and the carbon brush, while simultaneously creating a heat dissipation channel between the carbon brush sleeve and the carbon brush. Multiple heat dissipation holes are also provided on the carbon brush sleeve to quickly dissipate the heat generated by the sliding friction between the carbon brush and the commutator. However, during rotor rotation, the carbon brushes in this patent tend to move radially outward, which cannot guarantee stable contact between the inner end of the carbon brush and the commutator, affecting the continuous and stable rotation of the rotor. Furthermore, the processing of multiple heat dissipation holes increases the motor's heat dissipation cost.
[0003] Therefore, it is urgent to improve the existing motor brush holder to ensure stable contact between the brush and the commutator while ensuring heat dissipation of the brush. Utility Model Content
[0004] The purpose of this utility model is to overcome the defects and deficiencies in the existing technology. To this end, this utility model provides a carbon brush positioning component and its motor carbon brush holder, which can achieve stable contact between the carbon brush and the commutator and ensure rapid heat dissipation of the carbon brush.
[0005] To achieve the above objectives, this utility model provides a carbon brush positioning assembly, including a carbon brush sleeve in which a carbon brush is embedded, and a positioning plate provided between the carbon brush sleeve and the carbon brush; the inner end of the positioning plate is fastened to the side wall end of the carbon brush sleeve, and the other end is integrally provided with a coil spring; the outer end of the carbon brush abuts against the coil spring, and the coil spring is placed inside the carbon brush sleeve; a radial guide groove is provided on one side of the carbon brush sleeve, and a carbon brush guide post for conducting electricity is slidably provided in the guide groove; the carbon brush guide post is integrally fixed to one side of the outer end of the carbon brush.
[0006] Furthermore, an inductor coil spirally wound on a cylindrical magnetic core is fixed on the outer side of the carbon brush sleeve; the carbon brush guide post extends out of the guide groove and is electrically connected to one end of the inductor coil, and the other end of the inductor coil is connected to an external power source.
[0007] Furthermore, the inner end of the positioning plate is integrally provided with a U-shaped hook, which matches the inner sidewall of the carbon brush sleeve.
[0008] Furthermore, the carbon brush sleeve has two first heat dissipation grooves on the top inner wall, and a second heat dissipation groove on the inner wall of the carbon brush sleeve on the side away from the guide groove; the positioning plate is located in the second heat dissipation groove; the first heat dissipation grooves are located at the corresponding corners of the top of the carbon brush.
[0009] This utility model also provides a motor carbon brush holder, including the above-mentioned carbon brush positioning components, wherein the number of carbon brush positioning components is two.
[0010] Furthermore, the motor brush holder also includes a brush base, with two brush sleeves integrally and symmetrically fixed to the top of the brush base; the top of the brush base is provided with a U-shaped seat that matches the inductor coil along the radial direction, one end of the U-shaped seat is provided with a limiting cover, and the top of the limiting cover is provided with a wire feeding groove; the inductor coil is placed horizontally on the U-shaped seat; one end of the inductor coil is embedded in the limiting cover and electrically connected to the brush guide post through the wire feeding groove.
[0011] Furthermore, the two U-shaped seats are symmetrically arranged on both sides of the carbon brush sleeve along the circumference.
[0012] Furthermore, the motor brush holder also includes an electrically connected conductive plate and a PCBA control circuit board; the PCBA control circuit board is fixed to the top of the brush holder, and the conductive plate is fixed to the bottom of the brush holder; the outer wall of the brush holder is provided with a sealing seat for internal wires; the conductive plate is externally connected to a plug via a wire; the inductor coil is electrically connected to the conductive plate at the end away from the brush post; a protective plate is provided on the outer side of the brush post; the protective plate is integrally connected to the corresponding brush holder and brush sleeve.
[0013] Furthermore, the carbon brush base is provided with two welding holes, and two protrusions are provided in the welding holes. The protrusions are integrally formed with the conductive plate; the end of the inductor coil away from the carbon brush post is welded to the two protrusions.
[0014] Furthermore, the top of the carbon brush base is provided with two third heat dissipation grooves, which are located at the corresponding corners of the bottom of the carbon brush.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by fastening one end of the positioning plate to the inner side wall of the carbon brush sleeve and by having the coil spring abut against the carbon brush, the radial outward movement tendency of the carbon brush can be counteracted and a reverse force can be applied to the carbon brush, so that the carbon brush and the commutator can be in stable contact; the guide groove facilitates the installation and movement of the carbon brush guide post, ensuring the positional stability of the carbon brush; the guide groove forms a heat conduction channel, which facilitates the heat dissipation of the carbon brush; the inductor coil and the cylindrical magnetic core form a choke coil, which plays a role in choking and filtering, as well as assisting in supporting the carbon brush guide post, ensuring the stability of the carbon brush operation. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention;
[0018] Figure 3 This is a bottom view of the present invention;
[0019] Figure 4 This is another cross-sectional schematic diagram of the present invention;
[0020] Figure 5 This is a schematic diagram of the positioning plate in this utility model;
[0021] Figure 6 This is a schematic diagram showing the connection between the conductive plate and the plug in this utility model.
[0022] The components include: 1. Carbon brush sleeve; 2. Carbon brush; 3. Positioning plate; 4. Carbon brush guide post; 5. Inductor coil; 6. Cylindrical magnetic core; 7. Carbon brush base; 8. Conductive plate; 9. PCBA control circuit board; 11. Guide groove; 12. First heat dissipation groove; 13. Second heat dissipation groove; 31. U-shaped hook; 32. Coil spring; 71. U-shaped seat; 72. Limiting cover; 73. Sealing seat; 74. Plug; 75. Welding hole; 76. Protective plate; 77. Third heat dissipation groove; 81. Protrusion. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. Example
[0025] Please see Figures 1 to 6 This utility model provides a motor carbon brush holder, including a carbon brush base 7, with two carbon brush positioning components symmetrically arranged at the top of the carbon brush base 7. The carbon brush positioning component includes a carbon brush sleeve 1 for embedding a carbon brush 2, and a positioning plate 3 is provided between the carbon brush sleeve 1 and the carbon brush 2; the inner end of the positioning plate 3 is fastened to the side wall end of the carbon brush sleeve 1, and the other end is integrally provided with a coil spring 32; the outer end of the carbon brush 2 abuts against the coil spring 32, and the coil spring 32 is placed inside the carbon brush sleeve 1; a radial guide groove 11 is provided on one side of the carbon brush sleeve 1, and a carbon brush guide post 4 for conducting electricity is slidably arranged in the guide groove 11; the carbon brush guide post 4 is integrally fixed to one side of the outer end of the carbon brush 2.
[0026] Specifically, the inner end of the positioning plate 3 is integrally provided with a U-shaped hook 31, which matches the inner side wall of the carbon brush sleeve 1, thereby enabling the positioning plate 3 to be fastened to the side wall end of the carbon brush sleeve 1.
[0027] The U-shaped hook 31 is fastened to the inner side wall of the carbon brush sleeve 1, and the coil spring 32 abuts against the carbon brush 2. This counteracts the radial outward movement tendency of the carbon brush 2 and applies a reverse force to the carbon brush 2, ensuring stable contact between the carbon brush 2 and the commutator. The guide groove 11 facilitates the installation and movement of the carbon brush guide post 4, ensuring the positional stability of the carbon brush 2. At the same time, the guide groove 11 forms a heat conduction channel, facilitating heat dissipation of the carbon brush 2.
[0028] In one embodiment of this utility model, an inductor coil 5 spirally wound on a cylindrical magnetic core 6 is fixedly mounted on the outer side of the carbon brush sleeve 1; the carbon brush guide post 4 extends out of the guide groove 11 and is electrically connected to one end of the inductor coil 5, and the other end of the inductor coil 5 is connected to an external power supply. The inductor coil 5 and the cylindrical magnetic core 6 form a choke coil, which plays a role in choking and filtering, and also helps to support the carbon brush guide post 4, further ensuring the stability of the carbon brush 2 operation.
[0029] As an embodiment of the present invention, the top inner wall of the carbon brush sleeve 1 is provided with two first heat dissipation grooves 12, and the inner wall of the carbon brush sleeve 1 on the side away from the guide groove 11 is provided with a second heat dissipation groove 13; the positioning plate 3 is located in the second heat dissipation groove 13; the first heat dissipation grooves 12 are located at the corresponding corners of the top of the carbon brush 2.
[0030] The top of the carbon brush base 7 can be provided with two third heat dissipation slots 77, which are located at the corresponding corners of the bottom of the carbon brush 2.
[0031] By using the first heat dissipation groove 12, the second heat dissipation groove 13, and the third heat dissipation groove 77, the contact area between the inner wall of the carbon brush sleeve 1 and the carbon brush 2 is reduced, forming a heat dissipation channel between the carbon brush sleeve 1 and the carbon brush 2. This allows for the rapid dissipation of heat generated by the sliding friction between the carbon brush 2 and the commutator, as well as the heat generated by the carbon brush 2 when conducting current. This prevents the continuous accumulation of heat, which could lead to excessive temperature rise and sticking of the carbon brush 2. To a certain extent, this improves the durability of the carbon brush 2 and reduces the heat dissipation cost of the motor. It also prevents the carbon brush sleeve 1 from deforming due to high temperature and jamming the carbon brush 2, thus preventing the carbon brush 2 from contacting the commutator and forming an open circuit.
[0032] By arranging the guide groove 11, the first heat dissipation groove 12, the second heat dissipation groove 13, and the third heat dissipation groove 77 on the carbon brush sleeve 1, a larger contact area between the carbon brush 2 and the commutator can be ensured. This results in a wider current conduction path, reduced resistance, lower energy loss and heat generation in the carbon brush 2, thereby improving the conductivity stability of the carbon brush 2, reducing spark generation, increasing the conductivity efficiency of the carbon brush 2 and the operating efficiency of the corresponding equipment, reducing wear on the carbon brush 2, and extending its service life. Overall, this invention can adapt to high-current scenarios and enhance overload capacity.
[0033] In one embodiment of this utility model, the top of the carbon brush base 7 is provided with a U-shaped seat 71 that matches the inductor coil 5 along the radial direction. One end of the U-shaped seat 71 is provided with a limiting cover 72, and the top of the limiting cover 72 has a wire feeding groove. The inductor coil 5 is placed horizontally on the U-shaped seat 71. One end of the inductor coil 5 is embedded in the limiting cover 72 and electrically connected to the carbon brush guide post 4 through the wire feeding groove. Here, the winding length of the inductor coil 5 matches the length of the cylindrical magnetic core 6, and the positional stability of the inductor coil 5 can be ensured by the U-shaped seat 71 and the limiting cover 72.
[0034] The two U-shaped seats 71 here are preferably arranged symmetrically on both sides of the carbon brush sleeve 1 along the circumference.
[0035] As an embodiment of this utility model, the motor carbon brush holder also includes an electrically connected conductive plate 8 and a PCBA control circuit board 9; the PCBA control circuit board 9 is fixed at the top of the carbon brush base 7, and the conductive plate 8 is fixed at the bottom of the carbon brush base 7; the outer wall of the carbon brush base 7 is provided with a sealing seat 73 for the built-in wire; the conductive plate 8 is externally connected to a plug 74 through a wire; the inductor coil 5 is electrically connected to the conductive plate 8 at the end away from the carbon brush guide post 4; a protective plate 76 is provided on the outer side of the carbon brush guide post 4; the protective plate 76 is integrally connected to the corresponding carbon brush base 7 and carbon brush sleeve 1, thereby ensuring that the connection between the carbon brush guide post 4 and the inductor coil 5 is not affected by the external environment and improving the overall stability.
[0036] In one embodiment of this utility model, the carbon brush base 7 is provided with two welding holes 75, and two protrusions 81 are provided in the welding holes 75. The protrusions 81 are integrally formed with the conductive plate 8; the end of the inductor coil 5 away from the carbon brush post 4 is welded to the two protrusions 81. The welding holes 75 here are preferably rectangular holes.
[0037] In addition, the conductive plate 8 has multiple protrusions that pass sequentially through the carbon brush base 7 and the PCBA control circuit board 9, and are soldered to the PCBA control circuit board 9 to achieve an electrical connection between the conductive plate 8 and the PCBA control circuit board 9. The wires pass through the sealing seat 73 and are securely soldered to the conductive plate 8, achieving an electrical connection between the wires and the conductive plate 8. Figure 3 As shown, a convex mounting hole is provided at the connection between the carbon brush guide post 4 and the inductor coil 5. This mounting hole is located on the carbon brush base 7, and the details will not be elaborated further.
[0038] This utility model can be summarized in other specific forms that do not depart from the spirit or main features of this utility model. Therefore, in all respects, the above embodiments of this utility model should only be considered as descriptions of this utility model and not as limitations thereof. The claims specify the scope of this utility model, while the above description does not specify the scope of this utility model. Therefore, any changes within the meaning and scope equivalent to the claims of this utility model should be considered as included within the scope of the claims of this utility model.
Claims
1. A carbon brush positioning assembly, comprising a carbon brush sleeve (1) in which a carbon brush (2) is embedded, characterized in that, A positioning plate (3) is provided between the carbon brush sleeve (1) and the carbon brush (2); the inner end of the positioning plate (3) is fastened to the side wall end of the carbon brush sleeve (1), and the other end is integrally provided with a coil spring (32); the outer end of the carbon brush (2) abuts against the coil spring (32), and the coil spring (32) is placed inside the carbon brush sleeve (1); a radial guide groove (11) is provided on one side of the carbon brush sleeve (1), and a carbon brush guide post (4) for conducting electricity is slidably provided in the guide groove (11); the carbon brush guide post (4) is integrally fixed on one side of the outer end of the carbon brush (2).
2. The carbon brush positioning assembly according to claim 1, characterized in that, An inductor coil (5) is fixedly mounted on the outside of the carbon brush sleeve (1) and spirally wound on the cylindrical magnetic core (6); the carbon brush guide post (4) extends out of the guide groove (11) and is electrically connected to one end of the inductor coil (5), and the other end of the inductor coil (5) is connected to an external power source.
3. The carbon brush positioning assembly according to claim 2, characterized in that, The inner end of the positioning plate (3) is integrally provided with a U-shaped hook (31), which matches the inner side wall of the carbon brush sleeve (1).
4. The carbon brush positioning assembly according to claim 2 or 3, characterized in that, The carbon brush sleeve (1) has two first heat dissipation grooves (12) on its top inner wall, and a second heat dissipation groove (13) on the inner wall of the carbon brush sleeve (1) on the side away from the guide groove (11); the positioning plate (3) is located in the second heat dissipation groove (13); the first heat dissipation grooves (12) are located at the corresponding corners of the top of the carbon brush (2).
5. A motor carbon brush holder, characterized in that, The invention includes the carbon brush positioning assembly as described in claim 4, wherein the number of the carbon brush positioning assemblies is two.
6. The motor carbon brush holder according to claim 5, characterized in that, The motor carbon brush holder also includes a carbon brush base (7), and two carbon brush sleeves (1) are integrally and symmetrically fixed at the top of the carbon brush base (7); the top of the carbon brush base (7) is provided with a U-shaped seat (71) that matches the inductor coil (5) along the radial direction, and a limiting cover (72) is provided at one end of the U-shaped seat (71), and a wire feeding groove is opened at the top of the limiting cover (72); the inductor coil (5) is placed horizontally on the U-shaped seat (71); one end of the inductor coil (5) is embedded in the limiting cover (72) and electrically connected to the carbon brush guide post (4) through the wire feeding groove.
7. The motor carbon brush holder according to claim 6, characterized in that, The two U-shaped seats (71) are symmetrically arranged on both sides of the carbon brush sleeve (1) along the circumference.
8. The motor carbon brush holder according to claim 7, characterized in that, The motor brush holder also includes an electrically connected conductive plate (8) and a PCBA control circuit board (9); the PCBA control circuit board (9) is fixed at the top of the brush base (7), and the conductive plate (8) is fixed at the bottom of the brush base (7); the outer wall of the brush base (7) is provided with a sealing seat (73) for the built-in wire; the conductive plate (8) is connected to a plug (74) through a wire; the inductor coil (5) is electrically connected to the conductive plate (8) at the end away from the brush post (4); a protective plate (76) is provided on the outside of the brush post (4); the protective plate (76) is integrally connected to the corresponding brush base (7) and brush sleeve (1).
9. The motor carbon brush holder according to claim 8, characterized in that, The carbon brush base (7) is provided with two welding holes (75), and two protrusions (81) are provided in the welding holes (75). The protrusions (81) are integrally formed with the conductive plate (8). The end of the inductor coil (5) away from the carbon brush post (4) is welded to the two protrusions (81).
10. The motor carbon brush holder according to claim 9, characterized in that, The top of the carbon brush base (7) is provided with two third heat dissipation grooves (77), which are located at the corresponding corners of the bottom of the carbon brush (2).