KR20010112788A - Brush holder of vehicle wiper motor - Google Patents

Abstract

The invention relates to a method for producing soft to medium-hard polyurethane moulded bodies having thickened border areas of a given hardness and a markedly softer core, which bodies are called structural foams, in which physical foaming agents from the C 6 -hydrocarbon series are used.

Description

Brush holder for car wiper motor {BRUSH HOLDER OF VEHICLE WIPER MOTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder of a vehicle wiper motor, and more particularly, to a brush holder of a vehicle wiper motor which has an improved maximum contact area while preventing cracking and dropping due to hardening of the brush contact surface due to contact with a rotating commutator. will be.

In general, a vehicle wiper has a motor part that generates rotational force by the power of the battery, a link part that converts the rotational force generated from the motor into angular motion, and is connected to the link part to transfer the vehicle by angular motion. It consists of a braid assembly that wipes off dirt or rain from the glass.

The motor generating the rotational force for the angular movement of the wiper, as shown in Figure 1, the brush holder holding plate (2) formed a circular hole opened in the center and the position opposite to each other the brush holder holding plate (2) And a commutator 1 which is rotated by interaction with an electric current which is brought into contact with the end face of the brush 4 and placed therein, the brush 4 being in constant contact with the commutator 1. In order to maintain a continuous contact surface during wear due to the elastic means such as a spring (not shown) is to be accommodated in the brush holder (3).

However, the conventional brush holder 3 as described above is hardened by the frictional heat of the brush 4 and the commutator 1 as the motor is used, and thus the brush 4 is broken due to the vibration when the commutator 1 is rotated. Some of them will be eliminated, making smooth energization impossible.

Therefore, the present invention has been invented to solve the problem in view of the above-described conventional problems, and prevents cracking or partial dropping of the contact surface due to hardening of the brush contact surface which continuously contacts the commutator to conduct current, thereby maintaining a continuous contact force. It is supposed to be maintained.

1 is a front view of a conventional wiper motor brush holder for a vehicle,

2 is a front view of the wiper motor brush holder for a vehicle according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: commutator 2: brush holder fixing plate

3: brush holder 4: brush

O: center

H, H ′: travel width L, L ′: centerline

When described in detail with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object are as follows.

Figure 2 is a front view of the brush holder according to the present invention, the commutator 1 is provided so that the electric motor is freely rotated on the brush holder holding plate 2, as in the conventional case described above, and the position opposite to each other commutator 1 It consists of a brush (4) accommodated in the brush holder (3) to be in contact with, the brush (4) is parallel to the upper and lower parts by the moving width (H, H ') relative to the center (O) of the commutator 1 Is moved.

Here, the center point O of the commutator 1 and the center lines L and L 'of the brush 3 are in contact with the same contact angle θ, which is perpendicular to the circumferential direction of the commutator 1. The contact area is relatively wider than that of the brush 4, and of course, the contact area can be maintained even in partial wear.

Therefore, when the power of the battery is energized by the brush 4 of the electric motor according to the operation of the wiper operation switch provided in the driver's seat of the vehicle, the commutator 1 is caused by the interaction of the brush 4 with the commutator 1 and the current. Is rotated to provide rotational force for the angular movement of the wiper.

Since the brush holder 3 is in contact with the commutator 1 inclined in the circumferential direction of the commutator by moving the brush holder 3 as described above, the contact area increases, and preferably the brush holder 3 is the commutator center O. In order to move the commutator 1 in the same direction as the rotation direction, the brushes 4 do not interfere with the rotation of the commutator 1, and the movement widths H and H 'are opposite to each other and the same predetermined height. The parallel movement is required to obtain a stable coloning force.

As described above, the present invention has been described with respect to an electric motor having a commutator 1 rotated through two brushes 4 facing each other, but two or more brushes 4 are in contact with the commutator 1. Even in the electric motor having a brush (4) and the commutator (1) according to the invention in order to have a predetermined moving width (H, H ') around the commutator (1) in order to expand the contact area and maintain a continuous contact area of the brush ( Of course, 4) can be arranged.

As described above, by moving the brush in parallel along the circumferential surface of the hole opened in the brush holder fixing plate, the contact area between the brush and the commutator is increased and the frictional resistance is reduced, resulting in less heat generation. This prevents the tip from falling out.

Claims (2)

In the vehicle wiper motor comprising a commutator (1) mounted on the brush holder holding plate (2) freely rotated and a brush holder (3) containing a brush (4) provided to face each other to contact the commutator (1), Brush brush of the vehicle wiper motor, characterized in that the brush (4) is provided so as to be opposed to each other by moving up and down in parallel from the center (O) of the commutator (1). The brush holder of the wiper motor for a vehicle according to claim 1, wherein the center lines L and L ′ of the brush 4 are brought into contact with an inclined contact angle θ at the center point O of the commutator 1. .