JPS60208071A - Brush holder of rotary electric machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a brush holder device for a rotating electric machine.

Brush holders for rotating electric machines, especially starters for vehicles, are increasingly being molded from resin in order to reduce the number of parts, improve reliability against rust, and reduce weight. In the case of brush holders, the brush storage part for cylindrical commutators, which are the mainstream of vehicle starters, is open only in the rotational radial direction, so there are many mold structures when integrally molding this brush storage part. It tends to be a type that slides in the direction. In order to prevent this, if a two-way split mold is adopted, which is the simplest type of mold, it is easy to create a structure in which the brush storage part does not come out easily. It is a difficult problem to prevent this from occurring.

In view of the above-mentioned problems, the present invention has been developed in which a brush holder is resin-molded using a mold split in two directions, and the end frame is designed to prevent the brush from jumping out from the brush storage part of the brush holder in the split direction. The brush holder and the brush are also made of resin so that the brush holder and the brush are sandwiched and fixed between the end surface of the yoke and the inner surface of the end frame.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a longitudinal cross-sectional view of a main part of a motor section of an automobile starter to which two embodiments of the brush holder device for a rotating electric machine according to the present invention are applied, and FIG. 2 is a view taken along line A-A shown in FIG. FIG. 3 is a longitudinal cross-sectional view of a main part and a perspective view of a resin brush holder in the present invention. Reference numeral 1 denotes a cork of the motor portion of the starter, which is provided with a stepped portion 1a. Reference numeral 2 denotes an end frame molded from a resin, for example, a phenolic thermosetting resin, and its end face 2b fits into the stepped portion 1a of the yoke 1.

3 is an armature equipped with a cylindrical commutator 3a. Reference numeral 4 denotes a brush holder integrally molded with resin in a two-way split mold, and as shown in Fig. 3, it has a brush storage part 4a, a plate part 4b, a notch part 4C for positioning and drawing out the brush lead wire, and a part for fixing the brush spring. The brush housing part 4a has a structure that supports both sides of the brush in the sliding direction, and the plate part 4b together supports three sides of the brush, and the side facing the end frame when assembled is provided with a protrusion 4d. It's open. 5 is a brush. Bolts 6 sandwich the yoke 1 between the housing (not shown) and the end frame 2, tighten and fix it, and rotatably support the armature 3. At the same time, the end frame side of all the brushes is connected to the end frame 2. A brush holder 4 and a brush 5 are sandwiched between the yoke 1 and the end frame 2 by simultaneously abutting them on the inner surface 2a. A brush spring 7 has one end inserted into a protrusion 4d of the brush holder, and the other end presses the brush 5 against the surface of the commutator 3a.

As described above, in the brush holder device for a rotating electric machine according to the present invention, the brush holder including the plate part, the brush storage part, the brush spring fixing protrusion, and the notch part for positioning and drawing out the brush lead wire is made of resin. integrally molded, the brush housing part has a structure that supports both sides of the brush in the sliding direction, one side of the brush in the axial direction is supported by the plate part, and the other side of the brush in the axial direction is made of resin. Since it is supported on the inner surface of the end frame, it is possible to mold the resin brush holder with a simple two-way split mold, and it is also possible to mold the resin brush holder with screws etc. from the outside of the end frame. Since there is no need to use a structure to fix it with
Since there are no holes, waterproofness is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a motor section of an automobile starter using an embodiment of a brush holder device for a rotating electric machine according to the present invention, and FIG. 2 is a main part taken along line A-A shown in FIG. FIG. 3 is a perspective view of the resin brush holder according to the present invention. 1... Cork, la... Stepped part of yoke, 2...
Resin end frame, 4... Resin brush holder,
4a... Brush storage section, 4b... Plate section, 4d
. . . Brush spring fixing protrusion, 4c . . . Notch for positioning and drawing out the brush lead wire, 3a . . . Commutator, 2a . . . Inner surface of end frame 2. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2 t A, J Figure 3

Claims (1)

[Claims] It has a structure that supports the plate part, the brush storage part, the brush spring fixing protrusion, the positioning and the drawing side of the brush lead wire, and one side in the axial direction of the brush is supported by the plate part, and the other side in the axial direction of the brush is supported. A brush holder device for a rotating electric machine, characterized in that the side surface is supported by the inner surface of an end frame made of resin.