JPH0516262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush holder device for a rotating electric machine.

Brush holders for starters for rotating electric machines, especially vehicles, are increasingly being molded from resin in order to reduce the number of parts, improve reliability against rust, and reduce weight. In manufactured brush holders, the brush housing part, which is compatible with cylindrical commutators, which are the mainstream of vehicle starters, is open only in the rotational radial direction, so the structure of the mold when integrally molding this brush housing part is It tends to be a type that slides in multiple directions. In order to prevent this, by adopting the simplest two-way split mold as a mold, it is easy to create a structure that prevents burrs from appearing in the brush storage part, but when the brush is stored, the brush will pop out in the direction of the mold split. It becomes a difficult problem to prevent this from happening.

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 vertical cross-sectional view of a main part of a motor section of an automobile starter to which an embodiment of the brush holder device for a rotating electrical machine according to the present invention is applied, and FIG. 2 is 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 yoke of the motor section of the starter, which is provided with a stepped section 1a. Reference numeral 2 denotes an end frame molded from 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 blade 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 storage part 4a has a structure that supports both sides of the brush in the sliding direction, and the plate part 4b is combined with the three
The surface that faces the end frame is left open during assembly. Reference numeral 5 indicates a brush, and reference numeral 6 indicates a bolt. The yoke 1 is sandwiched between the housing (not shown) and the end frame 2, and is tightened and fixed to support the armature 3 rotatably. A brush holder 4 and a brush 5 are held between the yoke 1 and the end frame 2 by simultaneously abutting them on the inner surface 2a of the end frame 2. 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, and the brush storage 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 supported by the inner surface of the end frame made of resin, or the resin brush holder can be easily molded. It is possible to do this with a two-way split mold, and there is no need to fix the conventional brush holder from the outside of the end frame with screws, etc., so it is possible to reduce the number of parts, and there are no holes. Therefore, it has a great effect of improving waterproofness.

[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 to which an embodiment of the brush holder device for a rotating electric machine according to the present invention is applied, and FIG.
FIG. 3 is a longitudinal cross-sectional view of the main part taken along the line -A, and a perspective view of the resin brush holder in the present invention. 1...Yoke, 1a...Stepped portion 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.

Claims (1)

[Claims] 1. A brush holder equipped with a plate part, a brush storage part, a protrusion for fixing the brush spring, and a cutout part for positioning and drawing out the brush lead wire is integrally molded with resin, and the brush storage part has both sides in the sliding direction of the brush. The brush has a supporting structure, and 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 supported by the inner surface of an end frame made of resin. Brush holder device for rotating electric machines.