JPH0739113A - Brush holder device for motor - Google Patents

Abstract

PURPOSE:To facilitate assembly of a brush holder device by mounting a brass lower plate which is inserted in a brush holding resin substrate and where an outside lead wire and a brush feeder line are connected, and forming the back plate of a brush pressing spring after storing the brush pressing spring. CONSTITUTION:A brush holding resin substrate (BH) 23 is mounted so as to be integrated with a brush box (BB) 25. The BB 25 is formed with a brass lower plate 24 inserted in the BH 23. One end of the brass lower plate 24 is turned up to connect a brush pigtail (BP) with an outside lead wire. A brush 21 is stored in the BB 25. To the BB 25, the BP 26 is connected from a opening part which is open in a perpendicular direction to a brush holder 20. After storing the brush 21, a brush pushing spring (BS) 22 is stored to press the brush 21 against a commutator 12. Then, the brass lower plate 24 is bent so as to be perpendicular to form the back plate of the BS 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder device for an electric motor.

[0002]

2. Description of the Related Art As a conventional technique of a brush holder for an electric motor of this type, there is known one disclosed in Japanese Utility Model Laid-Open No. 60-38053. This is a brush holder device for an electric motor, in which each brush is held between a brush holding resin substrate on which a conductive member for connecting the brushes is insert-molded and the brush holding resin substrate is provided on the brush holding resin substrate. A brush holder having a brush box integrally molded with a recessed portion, and when the brush holder is assembled, an opening of the recessed portion molded into the brush box is provided inside in the circumferential direction. When the brush and the brush pressing spring are stored in the brush box, the brush pressing spring is stored first, and the brush to which the brush power supply line is connected is stored. Although the commutator is inserted after the brush is stored, the brush is pressed inward in the circumferential direction by the brush pressing spring, so the brush is held by the holding means and the commutator is inserted.

[0003]

However, according to the above-mentioned technique, the brush box has a circumferentially inner opening for taking out the power supply line for the brush and a vertical direction of the brush box where the brush and the commutator come into contact with each other. Since there is an opening and the outer side in the circumferential direction is not open, when the brush and the brush pressing spring are to be stored in the brush box, they are stored from the inner opening in the circumferential direction. Store the brush springs first, then the brushes. Since the commutator is inserted after the brush pressed inward in the circumferential direction by the brush pressing spring is housed, it is difficult to insert the commutator in that state. Therefore, the holding means for holding the brush restrains the brush and inserts the commutator. Since the holding means is eliminated after the commutator is inserted, the number of assembling steps is long and the assembling cannot be done easily.

An object of the present invention is to make it easy to assemble a brush holder device for an electric motor.

[0005]

Means for Solving the Problems The measures taken in the present invention to solve the above-mentioned problems include a brush box provided integrally with a brush-holding resin substrate and open at both ends in the circumferential direction; And a brass plate lower plate for connecting the lead wire and the power supply line for the brush and bending the back plate of the brush pressing spring insert-molded in the brush holding resin substrate outward in the circumferential direction.

[0006]

According to the above-mentioned means, the brass plate lower plate which is insert-molded on the brush holding resin substrate and which connects the external lead wire and the brush power supply line is connected to the brush pressing spring after the brush pressing spring is housed. A backboard can be formed. Thereby, the commutator can be inserted first, and since the brush pressing spring is stored after the brush is stored, the commutator can be inserted without requiring a holding means for holding the brush, Assembly of the brush holder device of the electric motor becomes easy.

[0007]

Embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the housing 10
Has a shaft 11, a commutator 12, and a core 13. Further, although the housing 10 has the hose 14, it will be omitted from the description because it is out of the gist of the present invention. The brush holder 20 also includes a brush 21, a brush pressing spring 22, a brush holding resin substrate 23, a brass plate lower plate 24, and a brush box 25.

A permanent magnet 15 is fixed to the housing 10, and a shaft 11 press-fitted into bearings 16 and 17 is supported. Further, a housing 10a, to which the brush holder 20 is screwed, is fixed to the opening surface of the housing 10 so as to be perpendicular to the shaft 11.
A core 13 around which a plurality of coils 18 are wound is press-fitted onto the shaft 11. Further, a commutator 12 that performs a rectifying function is press-fitted into the shaft 11. This commutator 1
A brush 21 for power supply is constantly slid on 2. The brush 21 is housed in a brush box 25 made of resin, and is pressed against the commutator 12 by a brush pressing spring 24.

As shown in FIG. 2, the brush holder 20.
Is a brush holding resin substrate 23 and a brush box 25.
, Brass plate lower plate 24, brush pressing spring 22
And a brush 21. The brush holder 20 is screwed to the housing 10a. A brush box 25 is integrally provided on the brush holding resin substrate 23. The brush box 25 is provided with a brass plate lower plate 24 insert-molded on the brush holding resin substrate 23. As shown in FIG. 3, one end of the brass plate lower plate 24 is folded back in order to connect the brush pigtail 26 and an external lead wire (not shown). The brush 21 is housed in a brush box 25, and a brush pigtail 26 is connected to the brush box 25 through an opening that opens in a direction perpendicular to the brush holder 20. After housing the brush 21, the brush pressing spring 22 is housed to press the brush 21 against the commutator 12. After storing the brush 21 and the brush pressing spring 22, the brass plate lower plate 24
Bend the brush vertically so that the brush pressing spring 22
The brush pressing spring 22 has one end fixed and the other end pressing the brush 21.

In this embodiment, the brass plate lower plate 24 is insert-molded on the brush-holding resin substrate 23, the commutator 12 is inserted into a completed assembly of the brush holder 20, the brush 21 is housed, and then the brush is pressed. The spring 22 for use is stored. After housing the brush pressing spring 22, the brass plate lower plate 24 is bent to fix one end of the brush pressing spring 22, and finally the housing 10 and the housing 10a having the brush holder 20 are fixed.

[0012]

As described above, the back plate of the spring for pressing the brush is formed by the lower plate of the brass plate, which is connected to the external lead wire and the power supply line for the brush and is insert-molded on the resin substrate for holding the brush. Can be inserted into the
Moreover, since the brush pressing spring is housed after the brush is housed, it is not necessary to hold the brush and insert the commutator, which facilitates the assembly of the brush holder device of the electric motor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electric motor according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a brush holder device for an electric motor according to the present invention.

FIG. 3 is a perspective view of a brush holder device.

[Explanation of symbols]

 20 ... Brush holder 22 ... Brush pressing spring 23 ... Brush holding resin substrate 24 ... Brass plate lower plate 25 ... Brush box

Claims (1)

[Claims] 1. A brush holder device for holding a brush of an electric motor with a brush, which is provided integrally with a brush-holding resin substrate and has both ends in a circumferential direction opened, an external lead wire and a brush. A brush holder device for an electric motor, comprising: a brass plate lower plate that is connected to a power supply line and that is formed by bending the back plate of the brush pressing spring insert-molded in the brush holding resin substrate outward in the circumferential direction.