CN217692892U

CN217692892U - Brush, brush plate system and vehicle motor system

Info

Publication number: CN217692892U
Application number: CN202221734614.9U
Authority: CN
Inventors: 刘志斌; 熊慧民; 鱼兰琼; 周勇
Original assignee: Taicang Boze Drive System Co ltd
Current assignee: Taicang Boze Drive System Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-28
Anticipated expiration: 2032-07-07

Abstract

The utility model relates to a brush, brush board system and vehicle motor system. The brush includes a brush body and a terminal leg electrically connected thereto. One end of the brush body, which contacts a commutator of the motor, is constructed as a concave curved surface, and a groove extending substantially vertically through the end is provided in the middle of the concave curved surface. At least 2 arcuate ribs are provided on the concave curved surface, extend parallel to each other and generally horizontally along the concave curved surface, and are interrupted by the grooves. A brush plate system includes the above-described brush. A vehicle electric machine system includes the brush plate system described above. The utility model discloses can improve motor system's noise performance, improve motor system's electric current ripple performance simultaneously.

Description

Brush, brush plate system and vehicle motor system

Technical Field

The utility model relates to a motor field. Specifically, in a first aspect, the present invention relates to a brush for a vehicle electric machine. In a second aspect the present invention relates to a brush plate system comprising such a brush. In a third aspect, the present disclosure is directed to a vehicle motor system including the brush plate system, such as for window adjustment.

Background

Most vehicle window motor systems today employ a brushed motor that includes brushes and terminal legs electrically connected thereto. In addition, in order to implement the anti-pinch function, a current ripple (current ripple) technique is widely used because of low cost. However, it is difficult to obtain a stable current ripple signal under varying voltage, temperature and torque with this technique.

There are several methods to obtain a stable current ripple signal. For example, CN208608861U discloses an electric brush for improving current ripple performance, and the front end thereof is provided with an open groove. CN106374688A also discloses a brush for improving the current ripple performance, which includes a ripple notch portion. Although the above method can improve the current ripple performance of the motor system, it increases the air noise (air borne noise) of the motor system at the same time.

There remains a need to improve both the noise performance and the current ripple performance of motor systems.

Disclosure of Invention

Therefore, the object of the present invention is to improve the noise performance of an electric motor system while obtaining a stable current ripple signal. In a first aspect, the present invention provides a brush comprising a brush body and a terminal leg electrically connected thereto. The end of the brush body that contacts the commutator of the motor is configured as a concave curved surface with a groove extending substantially vertically through the end disposed in the middle of the concave curved surface. According to the utility model discloses, set up 2 at least arc protruding ribs on the concave curved surface, it is parallel to each other and along the roughly horizontal extension of concave curved surface to interrupted by the recess.

The utility model discloses an idea reduces the area of contact between brush and the commutator through setting up the abrupt rib to reduce the air noise that produces at the beginning because the friction between brush and the commutator. Meanwhile, due to the existence of the groove, a stable current ripple signal can be obtained.

According to an embodiment, the ribs abut each other. Preferably, the rib is centrally located on the concave curved surface in the vertical direction. It is further preferred that the ribs are arranged symmetrically with respect to the groove.

According to a preferred embodiment, the bottom surface of the rib is inclined with respect to the tangent of the concave curved surface, for example by an angle of 5 degrees. With this arrangement, as the ribs wear, the contact area between the brush and the commutator gradually increases, making the noise change smoothly.

The groove width is determined by the experimental results of motor noise and ripple. Preferably, the width of the groove is larger than or equal to the width of the groove between the commutator segments matched with the groove, and is smaller than 1/4 of the width of the brush. In this range, a stable current ripple signal can be obtained while improving the noise performance of the motor system.

In a second aspect, the present invention provides a vehicle electric machine system comprising the above-described brush.

In a third aspect, the present invention provides a vehicle electric machine system comprising a commutator and a brush plate system as described above. During brush operation, there are two point contacts between each rib and the commutator.

Compare with the brush of preceding structure, the utility model discloses a area of contact between brush and the commutator is little, reduces the air noise that produces at the beginning because the friction between brush and the commutator, still improves the electric current ripple performance simultaneously.

Drawings

Fig. 1 is a schematic perspective view of a brush of an embodiment of the present invention;

fig. 2A is a schematic front view of the brush of fig. 1;

FIG. 2B is a cross-sectional view of K-K of FIG. 2A;

FIG. 2C is an enlarged view of the circled portion of FIG. 2A; and

fig. 3 is a schematic perspective view of a brush according to another embodiment of the present invention.

The figures are not necessarily drawn to scale. In the drawings. Like reference numerals refer to like parts.

List of reference numerals

1. Electric brush

10. Electric brush body

20. Wiring leg

30. Rib

40. Groove

angle of inclination a

Radius of curvature R

W groove width.

D groove depth W1 brush width

Detailed Description

Embodiments of the present invention are described in detail below. For ease of description, directional terminology is used hereinafter with reference to the orientation of the figures. It will be appreciated that the actual orientation may vary.

Fig. 1 shows a brush 1 according to an embodiment of the present invention, which includes a brush body 10 and a terminal leg 20 electrically connected thereto. The end of the brush body that contacts the commutator is configured as a concave curved surface with a groove 40 extending generally vertically through the end disposed therebetween. The concave curve is also provided with 2 mutually adjoining arcuate ribs 30 which extend parallel to one another and substantially horizontally along the concave curve and are interrupted by grooves 40.

As shown in fig. 1, the rib 30 is centrally positioned on the concave curved surface in the vertical direction and is symmetrically arranged about the groove 40 (see fig. 2A).

Fig. 2B shows a view of section K-K of fig. 2A. As shown, the bottom surface of the rib 30 is inclined with respect to the tangent of the concave curved surface by an inclination angle a of 5 degrees.

Fig. 2C shows an enlarged view of the circled portion of fig. 2A. As shown, the concave curved surface has a radius of curvature R, a groove width W, and a depth D. The curvature radius R is slightly larger than the matched commutator radius. The groove width W is determined by the experimental result of motor noise and ripple, and is at least the groove width between commutator segments but less than 1/4 of the brush width W1. The groove depth D depends on the amount of wear of the brush over the life cycle.

Fig. 3 shows a brush 100 according to another embodiment of the present invention, which, like the embodiment of fig. 1, includes a brush body 110 and a terminal leg 120 electrically connected thereto. The end of the brush body that contacts the commutator is configured as a concave curved surface with a groove 140 extending generally vertically through the end disposed therebetween. The difference is that the concave curved surface is further provided with 3 mutually adjoining arc-shaped ribs 130 which extend parallel to each other and substantially horizontally along the concave curved surface and are interrupted by grooves 140.

Otherwise, the brush in fig. 3 is the same as the brush in fig. 1.

In some cases, the features disclosed in the present invention may be used independently of other features. On the other hand, when necessary, the features disclosed in the present invention may be combined to provide various combinations.

The words and expressions which have been employed in the present invention are used as terms of description and not of limitation, and there is no intention in the use of such words and expressions of excluding any equivalents of the features shown and described. Various modifications, variations and alternatives are possible within the scope of the claims. The claims are intended to cover all such equivalents.

Claims

1. A brush comprising a brush body and terminal legs electrically connected thereto, the end of the brush body in contact with a commutator of an electric machine being configured as a concave curved surface, in the middle of which a groove extending substantially vertically through the end is provided, characterized in that at least 2 arc-shaped ribs are provided on the concave curved surface, which are parallel to each other and extend substantially horizontally along the concave curved surface, and are interrupted by the groove.

2. The brush of claim 1, wherein the ribs abut one another.

3. The brush of claim 1, wherein the ribs are centrally located on the concave curved surface in a vertical direction.

4. The brush of claim 1, wherein the ribs are symmetrically arranged about the groove.

5. The brush according to any one of claims 1-4, wherein the bottom surface of the rib is inclined with respect to a tangent of the concave curved surface.

6. The brush of claim 5, wherein the bevel angle is 5 degrees.

7. The brush of any of claims 1-4, wherein the width of the groove is greater than or equal to the width of the groove between the segments and less than 1/4 of the brush width.

8. A brush plate system, characterized in that it comprises a brush according to any one of claims 1-7.

9. A vehicle motor system comprising a commutator, further comprising a brush plate system according to claim 8, wherein there are two point contacts between each rib and the commutator during brush operation.