Brush holder in electric motor

Abstract

A brush holder in an electric motor, held between a tubular yoke with a bottom and a bracket that covers an opening of the yoke, and constructed to be small in diameter and compact. The brush holder (7) is composed of a first disk (8) where a three-sided section (11b, 11c) of a brush reception section (11) is formed, and of a second disk (9) where a bottom section of the brush reception section is formed. A ring-like contact surface (8k) is formed on the bracket (6) side of the brush holder (7), and the contact surface (8k) is formed by the first and second disks (8, 9) and includes the bottom section of the brush reception section (11). Between the contact surface (8k) and a bore side disk surface (6h) of the bracket (6) are interposed an outer diameter-side section (16a), a bore side section (16b), and a bracket-side elastic member (16) having a connection section (16c) for connecting the outer diameter side section (16a) and the bore side section (16b).

Description

technical field [0001] The present invention relates to a brush holder in an electric motor constituting an electric component or the like mounted on a vehicle. Background technique [0002] Such an electric motor generally has a configuration in which a brush holder having a disk portion forming a brush accommodating portion is sandwiched between a bottomed cylindrical yoke and a bracket that covers the opening of the yoke. between. In the case of such a configuration, it is necessary to prevent the brush holder from rotating or dislocating with respect to the yoke or the bracket. Therefore, there is a method of integrating the three parts using a fixing method such as a screw, but this method is not only troublesome but also complicated to assemble. , and there are problems such as an increase in working hours or an increase in the number of parts. [0003] As an improvement measure, it is proposed to integrate the brush holder, the yoke, and the bracket by a fixing meth...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional structure, it is necessary to form a concave portion for fitting the protrusion on the outer periphery of the yoke or the case, so the outer diameter of the yoke or the case increases, which is contrary to light weight and miniaturization. The problem

Moreover, in this structure, it is necessary to fit a tubular elastic member to each protrusion formed in the circumferential direction, so the operation is troublesome and the production efficiency is low. This is the problem to be solved by the present invention.

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