JPH061967B2 - Brush holder device for rotating electric machine - Google Patents

Description

The present invention relates to a brush holder device for a rotary electric machine used in, for example, a starter.

[Conventional technology]

In general, a starter motor is rated for 30 seconds while other motors are continuously rated, so it is very small in size compared to other motors, and a large current can be flowed to achieve high output. It was possible. However, because of the large current, it is necessary to have brushes that are large and equal in number to the number of poles.
Met. Conventionally, most starter motors have four brushes with four poles in the field. In this case, the intervals between the brushes are 90 degrees, so even if the yoke diameter is small As shown in the publication, it was possible to arrange all the brush springs on the same side with respect to the brush, but there has been an attempt to achieve 6 poles in order to further reduce the size or magnetize the field. is there.

Then, when the field poles are made to have six poles, FIG. 6 and FIG.
As shown in the figure, the distance between the + side brush 2 and the-side brush 3 is 60 degrees, and the distance between the pair of brushes 2 and 3 having the same electrode is 120 degrees.

Therefore, considering the size restriction due to miniaturization and the insulation between the brushes 2 and 3 having different electrodes, only four brushes can be arranged.

[Problems to be solved by the invention]

However, in the above-mentioned conventional one, the + side brushes 2 and −
The distance between the side brush 3 and the side brush 3 is 60 degrees, and the insulation between the + side brush 2 and the-side brush 3 and the handling of the pigtails 2a, 3a, 2a 'and 3a' of the brushes 2 and 3 are taken into consideration. Then, it is necessary to provide the brush spring 4 between the + side brush 2 and the − side brush 3.

In FIG. 6, the left half surface has the brush spring 4 arranged on the left side of the brushes 2 and 3, and the right half surface has the brush spring 4 arranged on the right side of the brushes 2 and 3. Has become. When the brush holder plate 1 and the holding portion 1c are made of resin, the brush spring 4 held by the holding portion 1c has a coil portion 4a inserted into the holding portion 1c and a brush 2, as shown in FIG. It is necessary to use a coil spring composed of a pressing end 4b that presses the pressure coil 3.

Therefore, the above-mentioned coil spring has directionality,
As shown in FIG. 6, it is necessary to change the coil springs of the left half surface A and the right half surface B respectively, and two types of coil springs are required for one brush holder arrangement, resulting in cost UP and automatic assembly. In consideration of this, positioning of the brush holder plate, selection of the coil, etc. are necessary, which is very difficult.

[Means for solving problems]

Therefore, the present invention is directed to four brushes in which brushes of the same polarity are arranged adjacent to each other, a brush spring having directivity for pressing these brushes against a commutator, and a brush holder plate formed of a ring-shaped resin. And a holding portion formed on the brush holder plate for inserting the brush, and a holding portion formed on the side opposite to the side where the pigtail of the brush is pulled out and holding the brush spring. With respect to the pair of insertion parts and the holding part, so that the brush springs are arranged on the same side,
It is another object of the present invention to provide a brush holder device for a rotary electric machine, characterized in that another pair of insertion parts and holding parts are formed on opposite sides.

[Operation] With the configuration described above, the holding portions for holding the coil springs can be arranged on the same side with respect to the brush insertion portion.

〔The invention's effect〕

By doing so, even with a directional brush spring, only one type of brush spring is needed, and automatic assembly can be done very easily, and cost reduction and man-hour reduction can be achieved.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. First,
In FIG. 4, the starter motor will be briefly described. Reference numeral 10 is a yoke, and the inner circumference of the yoke 10 is
A six-pole magnet 11 forming a field is provided. An armature 12 is arranged on the inner circumference of the magnet 11, and both ends of an armature shaft 13 of the armature 12 are connected to the bearing 1
It is rotatably held by the front bracket 14 and the rear bracket 15 via 6. A commutator 17 is provided on the outer periphery of the armature shaft 13.

1 and 2 show a brush holder device. FIG. 1 is a front view seen from the rear bracket 15 side, and FIG. 2 is a front view seen from the front bracket 14 side.

Reference numeral 1 denotes a ring-shaped brush holder plate made of resin, a surface viewed from the rear bracket 15 side is D, and a surface viewed from the front bracket 14 side is E. Then, on the left half surface A on the surface D side of the plate 1 in FIG. 1, two pairs of wall portions 1a and 1b forming a brush insertion portion are formed at intervals of 60 degrees in the circumferential direction. A holding portion 1c for holding the brush spring 4 is integrally formed on the left side of the brush insertion portion.

Further, in FIG. 1, the right half surface B on the surface D side of the plate 1
Shows the surface opposite to the side on which the insertion portion and the holding portion 1c are formed by the step 1d.

As can be understood from FIGS. 1 and 2, the left half surface A of the plate 1 has a pair of insertion portion and holding portion 1.
c is formed, and the right half surface B is formed so that the left half surface A is turned upside down at the step 1d.

That is, by forming the pair of insertion portions and the holding portion 1c on the surfaces opposite to each other with respect to the other pair of the insertion portion and the holding portion 1c, all the holding portions 1c are leftward with respect to the insertion portion. Can be placed at.

2 and 3 are + side brushes and − side brushes that are respectively inserted between the pair of wall portions 1a and 1b, and are pigtails 2a and 2a, respectively.
3a is provided.

Then, one of the + side pigtails 2a has a surface D to a surface E.
To the surface E through the first notch 1e.
Connected at an intermediate position between the other + side pigtail 2a 'and the + side brush 2a arranged above, and as shown in FIG. 4, between the yoke 10 and the rear side bracket 15,
It is taken out to the outside through the insulator 18.

Further, the one-side pigtail 3a is routed from the surface D to the surface E through the second cutout portion 1f, and the surface E of the metal plate 5 provided at an intermediate position between the-side brushes 3 of the plate 1 is provided.
And the other-side pigtail 3a 'is routed from surface E to surface D through the third cutout 1g,
It is connected to the surface D side of the metal plate 5.

Then, from the outer periphery of the rear bracket 15, the screw 19 is screwed into the screw hole 5a of the metal plate 5 of the plate 1 to fix the plate 1, and the metal plate 5 and the rear bracket 15 are fixed by the screw 19. , Grounded.

Further, as shown in FIG. 5, the brush spring 4 is a coil spring, and includes a coil portion 4a inserted into the holding portion 1c and a pressing end 4 at one end for pressing the brushes 2 and 3.
b and a fixed end 4c for fixing the brush spring, which is provided at the other end.

The coil portion 4a of the brush spring 4 is inserted in the holding portion 1c. Further, a protrusion 1h projecting toward the inner peripheral side is formed at the end of the holding portion 1c to prevent the brush spring 4 from coming off. Further, the fixed end 4c is inserted and fixed in the indicator 1i provided on the plate 1.

The hole 1j provided in the brush holder plate 1 described above is 2
This is for forming the plate 1 with one mold and for forming the protrusion 1h of the holding portion 1c.

FIG. 3 is an arrow view of FIG. 1, and FIG. 4 is an arrow view of FIG. 1. As can be seen from this, the same is true when a brush spring which is a directional coil spring is used. Brush springs of can be used.

Although the field magnet has 6 poles, any magnet having 6 poles or more can be applied to the rotating electric machine.

[Brief description of drawings]

1 is a front view of the brush holder device of the rotating electric machine according to the present invention seen from the rear bracket side, and FIG. 2 is a front view of the brush holder device of the rotary electric machine shown in FIG. 1 seen from the front bracket side, FIG. 4 is a front view of a main part as viewed from the arrow of FIG. 1 in a state where a brush holder plate is assembled, and FIG. 4 is a front view of a main part as viewed in the direction of an arrow of FIG. 6 is a perspective view showing a brush spring, FIG. 6 is a front view showing a conventional brush holder device for a rotary electric machine, and FIG. 7 is a rear view of the brush holder device for a rotary electric machine shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Brush holder plate, 1a, 1b ... A pair of wall part which comprises a brush insertion part, 1c ... Holding part of a brush spring,
2, 3 ... + side brush, -side brush, 2a, 3a ... pigtail,
4 ... Brush spring.

Claims (1)

[Claims] 1. Four brushes having brushes of the same polarity arranged adjacent to each other, a brush spring having directivity for pressing the brushes against a commutator, and a brush holder plate formed of a ring-shaped resin. The brush holder plate includes an insertion portion for inserting the brush formed on the brush holder plate, and a holding portion formed on a side opposite to a side where the pigtail of the brush is pulled out and holding the brush spring. On the other hand, in order to arrange the brush springs on the same side, with respect to the pair of insertion parts and holding parts,
A brush holder device for a rotary electric machine, characterized in that another pair of insertion parts and holding parts are formed on opposite sides.