JPH099581A - Mounting structure for brush - Google Patents

Abstract

PURPOSE: To make it possible to perform the release inhibiting action of a support fitting in the brush mounting structure for a motor commutator and to easily draw the brush in order to replace it. CONSTITUTION: In a brush mounting structure of mounting a carbon brush 30 coupled to a support fitting 33 by a pigtail 31 and energized by a spring 35 in the cylindrical part 23a of a holder shank, a gap 27 opened at the mounting side of a holder cap 25 is formed between the part 23a and a holder body 12, and two arms 33a are formed at a gap capable of being inserted into the gap 27 are formed at the fitting 33. The gap 27 exhibits the sectional shape having a tapered part 27b that the deepest part is a narrow parallel part 27a and narrows toward the depth at the intermediate part and again becomes a parallel part 27c at the opening side, the arm 33a of the fitting 33 is so bent as to entirely become inwardly convex and be most narrowed at the interval at the intermediate part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush mounting structure for a motor, a generator or the like, and more particularly to a technique for firmly fixing a support metal fitting and a holder shank.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
01 is connected to the support bracket 103 and the spring 1
The brush 107, which is urged in the direction away from the support metal fitting 103 by 05, is attached to the main body 109 of the brush holder.
In the mounting structure of the brush, which is inserted into the holder shank 111 embedded in the holder shank, the support metal fitting 103 is fixed to the holder shank 111, and the holder cap 113 prevents the brush from coming off. A long slit hole 111a is formed and the support metal fitting 1
No. 03 arm portion 103a is formed with an outwardly convex portion 103b,
It is known that the brush 107 is prevented from coming off by fitting the slit hole 111a and the convex portion 103b into each other (Japanese Patent Laid-Open No. 54-119603).

With such a structure, if the support metal member 103 is pushed into the holder shank 111, it is prevented from coming off, and the holder cap 113 can be easily attached.

[0004]

However, since such a brush 107 comes into contact with a commutator (not shown) and is constantly subjected to friction, it gradually wears. Therefore, it must be replaced if necessary.

However, according to the conventional technique as described above,
As a result of the strong retaining action of the slit hole 111a and the convex portion 103b, the brush 107 cannot be easily removed,
There was a problem that it was difficult to exchange. Therefore, an object of the present invention is to make it possible to exert an action of preventing the support fitting from coming off, and to easily pull out the brush at the time of replacement.

[0006]

SUMMARY OF THE INVENTION In the brush mounting structure of the present invention, a brush holder that is connected to a supporting member by a pigtail and is urged by a spring in a direction away from the supporting member is used as a brush holder. In the mounting structure of the brush, which is inserted into the holder shank embedded in the main body of the holder, the supporting metal fitting is fixed to the holder shank, and the holder cap is attached from the outside to prevent the holder from falling off. Form a gap that opens to the holder cap mounting side with the main body,
A plurality of arms are formed in the supporting metal fitting at intervals so that the arms can be inserted into the gap, and when the arms are pushed into the gap, the arms are pushed inward by the wall surface of the gap. It is characterized in that the holder shank is bent and sandwiched from the outside.

When implementing this brush mounting structure, first, the main body of the brush holder is arranged outside the commutator, and the arm portion of the support metal fitting is pushed into the gap while inserting the brush into the holder shank. Then, the arm is pushed by the wall surface of the gap and bent inward, and the holder shank is pinched from the outside. At this time, the arm portion is in contact with the wall surface of the gap at its outer surface, and is in contact with the outer surface of the holder shank at its inner surface. Therefore, the arm portion is restrained from the inside and outside, and engages with the wall surface of the gap and the outer surface of the holder shank in a state of being in firm contact.

In this state, the spring is in a compressed state and tries to push out the support fitting. However, as described above, since the arm portion is firmly engaged with the gap and the holder shank, the reaction force of the spring is increased. The support metal does not pop out to some extent. As a result, the holder cap can be easily attached.

On the other hand, when replacing the brush, the holder cap is removed, and the support fitting is hooked with the tip of the nail and pulled. The arm portion of the support metal member is simply engaged with the gap and the holder shank by friction, and thus easily comes out. In such a brush mounting structure, the arm portion of the support metal member is curved inward so that the middle portion of the support metal member is protruded inward from the tip, and the gap is formed.
It is recommended to form it so that the depth is narrower than the entrance. By doing this, when inserting the arm part of the support bracket into the gap, the tip of the arm part is pushed toward the holder shank side by the gap, and the arm part extends straightly over the entire middle part of the convex part. Firmly contact the outer surface of the holder shank in the center. As a result, the arm portion and the holder shank can firmly come into frictional contact with each other over a wide area, and the retaining effect is enhanced.

In such a brush mounting structure, it is preferable that the gap has a tapered portion that gradually narrows inward. If this is a structure that narrows in a stepwise manner, the tip of the arm may get caught in this step, whereas if it is tapered it can be pushed smoothly into the gap. Because.

Further, in this brush mounting structure, it is more preferable that the depth of the tapered portion is a gap parallel to the outer surface of the holder shank. With this arrangement, when the arm is pushed deep into the gap, the tip portion is firmly sandwiched between the surfaces and is extended parallel to the outer surface of the holder shank. This is because they are in firm contact with both of them in a wider range and the retaining effect is further enhanced.

In particular, since the supporting metal fittings and the holder shank are often formed by bending a metal plate having a smooth surface, if the contact is not reliable, the engaging force due to friction may be insufficient and the fixing may be weakened. However, if the more preferable configuration described above is adopted, surface contact is ensured in a wide range, and even smooth surfaces are firmly engaged. And because it is a smooth surface, you can smoothly remove it when you try to remove it,
This is extremely advantageous in exerting the contradictory actions and effects of the firm removal prevention and easy withdrawal, which is the object of the present invention.

[0013]

FIG. 1 shows a motor 10 as an embodiment. The brush holder 20 is attached to the commutator 13 side of the metal main body case 11 of the motor 10.
Power is supplied by the carbon brush 30 fixed to 0. The brush holder 20 includes a holder shank 2 made of metal and embedded in a holder body 21 made of synthetic resin.
3 and a holder cap 25 made of synthetic resin.

The holder shank 23 is formed by bending a metal plate, and has a rectangular tubular portion 23a, a flange portion 23b that is prevented from coming off from the holder body 21, and a power supply terminal 23c.
Are provided. The holder body 21 is provided with a protrusion 21a for mounting the holder cap 25, and a screw thread 21b is provided therein. The holder cap 25 has a female screw 25a corresponding to the screw thread 21b formed on the inner surface thereof. In addition, the protruding portion 2 of the holder body 21
The 1a is also provided with a square hole 21c into which the holder shank 23 is inserted and fitted.

The square hole 21c is a stepped hole having a shape that forms a gap outside the cylindrical portion 23a of the holder shank 23 when the holder shank 23 is mounted on the front side and the rear side in the drawing of FIG. Has become. This gap is shown in Figure 2.
As indicated by reference numeral 27 in the enlarged cross-sectional view of (A), the parallel portion 2 having an opening at the mounting side of the holder cap 25 and a narrowest innermost portion is formed.
7a, and taper portion 27 that becomes narrower toward the back in the middle
It has a sectional shape of b and has a parallel portion 27c again on the opening side.

On the other hand, the carbon brush 30 is shown in FIG.
As shown in, the support metal 33 is supported by the pigtail 31 made of copper wire.
It is connected with and is supported by the spring 35.
3 has a structure biased in a direction away from 3. And
The support fitting 33 is formed by bending a metal plate,
Two arm portions 33a are formed at intervals that can be inserted into the above-mentioned gap 27. As clearly shown in FIG. 2 (A), the arm portions 33a are curved so as to be convex inward as a whole, and have the narrowest intervals in the middle. Also, arm 3
The distance between the ends of the gap 3a and the distance between the originals are as follows:
It is an intermediate interval of the intervals of 7a.

When attaching the carbon brush 30 to the brush holder 20, the carbon brush 30 is inserted into the holder shank 23, and the arm portion 3 of the support fitting 33 is further attached.
3a is pushed into the gap 27. Then, as shown in FIG. 2B, the arm portion 33a hits the taper portion 27b of the gap 27 and is gradually pushed inward, and is sandwiched between the holder main body 21 and the holder shank 23 by the narrow parallel portion 27a. Stop. As a result, the arm portion 33a is in a state in which the arm portion 33a is extended straight to the whole, and the cylindrical portion 23a of the holder shank 23 is firmly pinched in the range from the tip to the middle. In addition, the outer surface of the arm portion 33 a has a narrow parallel portion 2 with a gap 27.
It also makes firm contact with 7a.

As a result, the cylindrical portion 23 of the holder shank 23
Since the inner surface of the arm portion 33a of the support fitting 33 is firmly in contact with the outer surface of a, and the outer surface of the arm portion 33a is in contact with the gap 27, the arm portion 33a and the gap 27 and the arm portion 33a.
The holder shank 23 and the holder shank 23 are in close contact with each other and are firmly engaged with each other by a frictional force. Therefore, FIG.
As shown in (B), even if the spring 35 is compressed and deformed, it does not pop out. Therefore, after this, the holder cap 25
Can be easily screwed in.

On the other hand, when replacing the carbon brush 30 worn out by abrasion, the holder cap 25
Remove it, and hook the support bracket with the tip of your nail to pull it. The support metal fitting 33 is a holder shank 23 and a gap 27.
Since it is only in contact with, it can be easily removed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.
The gap 27 may be formed by one taper surface from the entrance to the back, or may be a mounting structure of a brush used for collecting electricity of a generator instead of a motor, etc., as long as it does not depart from the gist of the present invention. It is possible to transform into another mode.

[Brief description of drawings]

FIG. 1 is a front view showing an overall configuration of a motor as an embodiment and showing a partial cross section.

FIG. 2 is an enlarged view of a main part seen from the AA cross section of FIG.

FIG. 3 is a sectional view of a main part showing a conventional brush mounting structure.

[Explanation of symbols]

10 ... Motor, 11 ... Main body case, 20 ...
Brush holder, 21 ... Holder body, 23 ... Holder shank, 23a ... Cylindrical portion, 25 ... Holder cap, 27 ... Gap, 27a ... Narrow parallel portion, 27
b ... taper part, 27c ... wide parallel part, 30 ...
・ Carbon brush, 31 ... Pigtail, 33 ...
Support metal fittings, 33a ... arms, 35 ... springs.

Claims (4)

[Claims] 1. A brush, which is connected to a supporting member by a pigtail and is urged by a spring in a direction away from the supporting member, is inserted into a holder shank embedded in the main body of the brush holder to attach the supporting member. In a mounting structure of a brush which is fixed to the holder shank and then mounted with a holder cap from the outside to prevent the brush from coming off, a gap opening to the holder cap mounting side is formed between the holder shank and the main body of the brush holder. , A plurality of arms are formed in the supporting metal fitting at intervals so that they can be inserted into the gap, and the relationship between the gap and the arms is changed by pushing the arms into the gap, the arms are entirely inwardly moved by the gap wall surface. A brush mounting structure characterized in that it is configured to be pressed and bent so as to sandwich the holder shank from the outside. 2. The brush mounting structure according to claim 1, wherein the arm portion of the support metal member is curved so as to be convex inward so that the arm portion protrudes inward from the tip end thereof. A brush mounting structure characterized in that the gap is formed so as to be narrower than the entrance. 3. The brush mounting structure according to claim 2, wherein the gap has a tapered portion that gradually narrows inward. 4. The brush mounting structure according to claim 3, wherein a depth of the tapered portion is formed as a gap parallel to an outer surface of the holder shank.