JPS62171435A - Brush holder for rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce a cost and the number of man-hours, by arranging the whole retaining sections for retaining coil springs, on the same side against brush inserting sections. CONSTITUTION:A starter motor is provided with the magnet 11 of six poles on the inner periphery of a yoke 10, and on the inner periphery of the magnet 11, an armature 12 is set. The both ends of the shaft 13 of the armature 12 are rotatably retained by a front side bracket 14 and a rear side bracket 15 via a bearing 16, and a commutator 17 is set on the outer periphery of the shaft 13. In this case, brushes 2 are pressed against the commutator by brush springs 4, and brush inserting sections 1a-1b formed on a brush holder plate 1 and the retaining sections 1c of the brush springs 4 are arranged and are organized so that the springs 4 may be arranged on the same side against the brushes 2. As a result, even directional springs 4 can be settled with one kind, and automatic assembling can be also facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brush holder device for a rotating electric machine used, for example, in a starter.

[Conventional technology]

In general, starter motors are rated for 30 seconds, whereas other motors are rated continuously, so compared to other motors, they are very small and can carry a large current and generate high output. It was possible. However, due to the large current, it is necessary to have large brushes with the same number of poles as the number of poles (although the motor can be used with less than the same number, the output will be reduced accordingly).
Met.

Conventionally, most starter motors have four field poles and four brushes, and in this case, the distance between the brushes is 90 mm.
Because it is a degree interval, even if the yoke diameter is small, it will be
As shown in Publication No. 604, it was possible to arrange all the brush springs on the same side with respect to the brush, but attempts have been made to further reduce the size of the brush or to create six poles in order to magnetize the field. be.

Then, if the field poles are made six poles, Figures 6 and 7
As shown in the figure, the interval between the + side brush 2 and the - side brush 3 is 60 degrees, and the interval between a pair of brushes 2 and 3 having the same electrode is 120 degrees.

Therefore, considering dimensional constraints due to miniaturization and insulation between the brushes 2 and 3 having different electric scrapers, only four brushes can be arranged.

[Problem that the invention seeks to solve]

However, in the conventional type described above, the + side brush 2 and m
There is an interval of 60 degrees between the individual brushes 3 and the + side brush 2.
, considering the insulation between the - side brush 3 and the arrangement of the pigtails 2a, 3a, 2a', 3a' of the brush 2.3, the brush spring 4 is connected between the + side brush 2 and the m brushes 3. There is a need to establish a

In FIG. 6, on the left half surface, the brush spring 4 is arranged on the left side with respect to the brush 2.3, and on the right half surface, the brush spring 4 is arranged on the right side with respect to the brush 2.3. It has a structure.

Furthermore, when the brush holder plate 1 and the holding part IC are made of resin, the brush spring 4 held by the holding part IC has a coil portion 4a inserted into the holding part 1c and a brush 2° as shown in FIG. It is necessary to use a coil spring consisting of a pressing end 4b that presses the spring 3.

Therefore, the coil spring mentioned above has directionality.
As shown in Fig. 6, it is necessary to change the coil springs on the left half surface A and the right half surface B, and two types of coil springs are required for one brush holder arrangement, which increases the cost and requires automatic assembly. When considered,
There is a problem in that it is very difficult to position the brush holder plate, select the coil, etc.

[Means for solving problems]

Therefore, the present invention provides four brushes in which brushes of the same polarity are arranged adjacent to each other, a brush spring having a directionality that presses these brushes against a commutator, and a ring-shaped brush holder plate formed of resin. an insertion part for inserting the brush formed on the brush holder plate; and a holding part formed on the side opposite to the side from which the pigtail of the brush is pulled out and holding the brush spring, the brush , with respect to the pair of insertion part and holding part so that the brush springs are arranged on the same side,
Another object of the present invention is to provide a brush holder device for a rotating electrical machine, characterized in that another pair of insertion portions and holding portions are formed on opposite sides.

[Effect]

With the above-described configuration, all the holding parts for holding the coil spring can be arranged on the same side with respect to the brush insertion part.

〔Effect of the invention〕

By doing so, even if the brush spring has directionality, only one type of brush spring is required, and automatic assembly can be made very easily, reducing costs and man-hours.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

First, in FIG. 4, a brief explanation of the starter motor will be given. Numeral 10 is a yoke, and six magnets 11 forming a field are provided on the inner periphery of this yoke XO. An armature 12 is disposed on the inner periphery of the magnet 11, and both ends of an armature shaft 13 of the armature 12 are rotatably held by a front bracket 14 and a rear bracket 15 via bearings 16. Further, a commutator 17 is provided on the outer periphery of the armature shaft 13.

The brush holder device is shown in FIGS. 1 and 2, with FIG. 1 being a front view seen from the rear bracket 15 side, and FIG. 2 being a front view seen from the front bracket 14 side.

Reference numeral 1 denotes a ring-shaped brush holder plate made of resin, and the surface viewed from the rear side Bragalo 5 side is designated as D, and the surface viewed from the front side bracket 14 side is designated as E. and,
On the left half surface A of the plate 1 in FIG.
Two are formed with an interval of 0 degrees. Further, a holding portion 1c for holding the brush spring 4 is integrally formed on the left side of the brush insertion portion.

In addition, in Fig. 1, the right half surface B on the surface side of the plate 1
shows the surface opposite to the side where 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 A of the plate 1 has a pair of insertion parts and a holding part 1.
c is formed, and on the right half surface B, it is formed as if it were turned over to the left half surface with a step 1d.

In other words, by forming one pair of insertion portions and holding portions 1c on opposite sides of the other pair of insertion portions and holding portions 1c, all of the holding portions 1c are placed on the left side with respect to the insertion portion. It is possible to place it in

2.3 is a + side brush and a - side brush inserted between a pair of wall portions 1a and lb, respectively, and a pigtail 2a,
3a is provided.

Then, one + side pigtail 2a is routed from the surface to the surface E through the first notch 1e, and is routed between the other + side pigtail 2a' arranged on the surface E and the + side brush 2a. It is connected at an intermediate position and is taken out from between the yoke 10 and the rear bracket 15 via an insulator 18, as shown in Fig. 4.

In addition, one of the m pigtails 3a is routed from the surface to the surface E through the second notch 1f, and the surface E of the metal plate 5 provided at an intermediate position between the m brushes 3 of the plate 1.
The other one side Picchy/L/3a' is routed from the surface E to the surface through the third notch 1g, and is connected to the surface side of the metal plate 5.

Then, the screws 19 are inserted from the outer periphery of the rear side bracket 15 and screwed into the screw holes 5a of the metal plate 5 of the plate 1 to fix the plate 1 and connect the metal plate 5 and the rear side bracket 15 with the screws 19. , is grounded.

Furthermore, the brush spring 4 is a coil spring, as shown in FIG.
b, and a fixed end 4c provided at the other end for fixing the brush spring.

Then, the coil portion 4a of the brush spring 4 is inserted into the holding portion 1c. Furthermore, a protrusion 1h that protrudes toward the inner circumference is formed at the end of the holding portion 1c to prevent the brush spring 4 from coming off.

Furthermore, the fixed end 4c is connected to the indicator 1 provided on the plate 1.
1 and fixed it.

The hole 1j provided in the brush holder plate 1 described above is 2
This mold is used when forming the protruding portion 1h of the holding portion 1c when the plate 1 is formed using two molds.

Fig. 3 shows the [F] arrow in Fig. 1, and Fig. 4 shows the O in Fig. 1.
As seen from the arrow, even when a brush spring that is a directional coil spring is used, the same brush spring can be used.

In addition, although the field having six poles is shown, any field having six or more poles can be applied to rotating electric machines.

[Brief explanation of drawings]

FIG. 1 is a front view of the brush holder device of the rotating electrical machine of the present invention as seen from the rear bracket side, FIG. 2 is a front view of the brush holder device of the rotating electrical machine in FIG. 1 as seen from the front bracket side, and FIG. The figure is a front view of the main part in the direction of arrow [F] in Fig. 1 with the brush holder plate assembled, and Fig. 4 is a front view of the main part in the direction of arrow 00 in Fig. 1 with the brush holder plate assembled. , FIG. 5 is a perspective view showing a brush spring, FIG. 6 is a front view showing a conventional brush holder device for a rotating electrical machine, and FIG. 7 is a rear view of the brush holder device for a rotating electrical machine in FIG. 6. 1... Brush holder plate, la, lb... A pair of walls forming the brush insertion part + lc... Brush spring holding part, 2.3... Child side, negative side brush, 2a
. 3a...Pigtail, 4...Brush spring. Representative Patent Attorney Takashi OkabeFigure 3Figure 4

Claims (1)

[Claims] Four brushes in which brushes of the same polarity are arranged adjacent to each other, a brush spring having a directionality for pressing these brushes against a commutator, and a ring-shaped brush holder plate formed of resin. an insertion part for inserting the brush formed on the brush holder plate; and a holding part formed on the side opposite to the side from which the pigtail of the brush is pulled out and holding the brush spring, the brush , with respect to the pair of insertion part and holding part so that the brush springs are arranged on the same side,
A brush holder device for a rotating electric machine, characterized in that another pair of insertion portions and holding portions are formed on opposite sides.