Flat brush

Abstract

This utility model belongs to the field of micro motors, specifically relating to a flat brush, including a brush plate and two elastic arms. Each elastic arm has a connecting part at one end that is horizontally connected to the brush plate. The connecting part extends upward to form a supporting part, and the supporting part extends downward to form a contact part. Multiple brush heads are arranged at intervals on the contact part. The multiple brush heads are arc-shaped, and silver-palladium contact layers are respectively provided on the arc-shaped convex surfaces of the multiple brush heads. The elastic arms of this flat brush are formed by multiple bending to form the connecting part, supporting part, and contact part. The multiple brush heads adopt an arc structure design, which helps to improve the rigidity and elasticity of the elastic arms, avoids deformation due to fatigue accumulation, and ensures more reliable contact between the flat brush and the commutator surface. The brush heads contact the flexible circuit board through the silver-palladium contact layers, which can improve the hardness and wear resistance of the contact surface, effectively reduce the increase in contact resistance caused by wear, and help improve the working reliability of the micro motor and extend its service life.

Description

Technical Field

[0001] This utility model belongs to the field of micro motor technology, and specifically relates to a flat brush for micro motors. Background Technology

[0002] A micro motor is a small drive device with an output power typically below several hundred watts, primarily used in precision control and transmission systems. Its core type is a DC brushed motor, which generates mechanical vibration through the rotation of an eccentric wheel at the shaft end, producing inertial vibration. It is widely used in mobile phones, toys, medical equipment, and other fields.

[0003] The existing flat brushes used in micro motors are very thin and have weak force-bearing capacity. After a period of use, the brushes are prone to deformation, causing the multiple forked brush heads at the brush tip to shift. This results in poor consistency of the elasticity of the multiple forked brush heads. When the elasticity is insufficient, the contact between the brush and the commutator surface becomes unstable, sometimes making contact and sometimes disengaging due to slight vibration, which greatly affects the working reliability and service life of the micro motor. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a flat brush that can effectively enhance the brush's elasticity and rigidity, thereby improving the working reliability of micro motors and extending their service life.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A flat electric brush includes a brush plate and two elastic arms symmetrically distributed on the brush plate. Each elastic arm has a connecting part at one end that is horizontally connected to the brush plate. The connecting part is bent upward and extends to have a supporting part. The supporting part is bent downward and extends to have a contact part. Multiple brush heads are arranged at intervals on the contact part. The multiple brush heads are arc-shaped. A silver-palladium contact layer is respectively provided on the arc-shaped convex surface of the multiple brush heads.

[0006] In some embodiments, the plurality of brush heads have a plurality of arc-shaped grooves with equal spacing, and the tails of the plurality of brush heads are aligned on the same straight line.

[0007] In some embodiments, the brush plate, connecting part, supporting part, contact part, and multiple brush heads are integrally formed.

[0008] In some embodiments, one end of the brush plate has a connecting arm connected to the connecting portion, and a pressure groove is provided at the connection between the connecting arm and the connecting portion.

[0009] In some embodiments, semi-circular grooves are provided on both sides of the corresponding pressure groove at the connection between the connecting arm and the connecting part.

[0010] In some embodiments, the other end of the brush plate is provided with an arc-shaped bend.

[0011] In some embodiments, the width of the contact portion gradually increases from the support portion toward the plurality of brush heads.

[0012] In some embodiments, arc-shaped slots are provided on both sides of the contact portion.

[0013] In some embodiments, the included angle between the connecting portion and the supporting portion is 102°-108°.

[0014] In some embodiments, semi-circular positioning grooves are provided on both sides of the brush plate.

[0015] The beneficial effects of this utility model are as follows: The elastic arm of the flat brush is formed by multiple bending and shaping, and has a connecting part, a supporting part, and a contact part. The multiple brush heads adopt a circular arc structure design, which helps to improve the rigidity and elasticity of the elastic arm and avoid deformation due to fatigue accumulation. This ensures more reliable contact between the flat brush and the commutator surface. The brush head contacts the flexible circuit board through a silver-palladium contact layer, which can improve the hardness and wear resistance of the contact surface and effectively reduce the increase in contact resistance caused by wear. This is beneficial to improving the working reliability of the micro motor and extending its service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a front view of an embodiment of the present utility model; Figure 2 This is a right view of an embodiment of the present utility model; Figure 3 This is an unfolded view of the elastic arm according to an embodiment of the present invention. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-3 As shown, a flat electric brush includes a brush plate 1 and two elastic arms 2 symmetrically distributed on the brush plate 1. Each elastic arm 2 has a connecting part 21 at one end that is horizontally connected to the brush plate 1. The connecting part 21 extends upward to have a support part 22. The support part 22 extends downward to have a contact part 23. Multiple brush heads 24 are arranged at intervals on the contact part 23. The multiple brush heads 24 are arc-shaped. A silver-palladium contact layer 242 is respectively provided on the arc-shaped protrusion 241 of the multiple brush heads 24.

[0022] like Figure 1 and 2 As shown, multiple brush heads 24 have multiple equally spaced arc-shaped grooves 243, and the tails of the multiple brush heads 24 are aligned on the same straight line. This alignment ensures consistent elasticity across the brush heads, improving the contact reliability of the flat brush. The brush plate 1, connecting part 21, supporting part 22, contact part 23, and multiple brush heads 24 are integrally formed. This integrally formed structure improves the production efficiency and connection reliability of the flat brush. One end of the brush plate 1 has a connecting arm 11 connected to the connecting part 21, and a pressure groove 12 is provided at the connection between the connecting arm 11 and the connecting part 21. The pressure groove effectively releases and redistributes residual stress, effectively improving the fatigue life and reliability of the elastic arm.

[0023] like Figure 1As shown, semi-circular grooves 13 are respectively provided on both sides of the pressure groove 12 at the connection between the connecting arm 11 and the connecting part 21. The semi-circular grooves can relieve stress and improve the working reliability of the flat brush. An arc-shaped bending part 14 is provided on the other end of the brush plate 1. The bending part can enhance the overall rigidity of the brush plate and effectively improve the contact reliability of the flat brush. Semi-circular positioning grooves 15 are respectively provided on both sides of the brush plate 1. The brush plate is fixed by the semi-circular positioning grooves, thereby ensuring the connection reliability of the brush plate. Moreover, the use of semi-circular positioning grooves for fixing can avoid stress concentration and improve the working reliability of the flat brush.

[0024] like Figure 2 and 3 As shown, the width of the contact portion 23 gradually increases from the support portion 22 towards the multiple brush heads 24. This gradual increase in width ensures sufficient support for the multiple brush heads, increasing their rigidity and elasticity. Arc-shaped slots 231 are provided on both sides of the contact portion 23. These slots provide stress relief, improving the reliability of the flat brush. The angle between the connecting portion 21 and the support portion 22 is 102°-108°. The larger bending angle between the connecting portion and the support portion enhances the rigidity and elasticity of the entire elastic arm.

[0025] The elastic arm of this flat brush is formed by multiple bending processes, resulting in a connecting part, a supporting part, and a contact part. Multiple brush heads employ a circular arc structure design, which helps improve the rigidity and elasticity of the elastic arm, preventing deformation due to fatigue accumulation. This ensures more reliable contact between the flat brush and the commutator surface. The brush head contacts the flexible circuit board through a silver-palladium contact layer, which enhances the hardness and wear resistance of the contact surface, effectively reducing increased contact resistance caused by wear. This improves the reliability of the micro motor and extends its service life.

[0026] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A flat brush, characterized by: Including brush plate and two elastic arms which are symmetrically distributed on the brush plate, one end of each elastic arm has a connecting part which is horizontally connected with the brush plate, the connecting part is upwardly bent and extended to have a supporting part, the supporting part is downwardly bent and extended to have a contact part, a plurality of brush heads are arranged on the contact part in an interval, the plurality of brush heads are in the shape of arc strip, and a silver palladium contact layer is arranged on the arc convex surface of each brush head.

2. The flat brush according to claim 1, characterized in that: The plurality of brush heads have a plurality of arc-shaped grooves with the same spacing, and the tail ends of the plurality of brush heads are on the same straight line.

3. A flat brush according to claim 1 or 2, characterized in that: The brush plate, the connecting part, the supporting part, the contact part and the plurality of brush heads are integrally formed.

4. The flat brush of claim 1, wherein: One end of the brush plate has a connecting arm which is connected with the connecting part, and a pressing groove is arranged at the connecting position of the connecting arm and the connecting part.

5. The flat brush of claim 4, wherein: Half-circular grooves are arranged on both sides of the pressing groove at the connecting position of the connecting arm and the connecting part.

6. The flat brush of claim 4 wherein: An arc-shaped bending part is arranged on the other end of the brush plate.

7. The flat brush of claim 1 wherein: The width of the contact part gradually increases from the supporting part to the plurality of brush heads.

8. The flat brush of claim 7, wherein: Half-circular grooves are arranged on both sides of the contact part.

9. The flat brush of claim 1 wherein: The included angle between the connecting part and the supporting part is 102°-108°.

10. The flat brush of claim 1, wherein: Half-circular positioning grooves are arranged on both sides of the brush plate.

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