JP2000175413A - Brush device of electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the effective abrasion length of a brush without increasing the length of the brush, under such a configuration that the brush is coupled with a pigtail and a pigtail inserting opening is not opened to the commutator side. SOLUTION: In the brush device of a electric rotating machine involving a brush holder 80 and a brush 40 coupled with a pigtail 42, the brush holder 80 is formed with a pigtail-inserting hole communicating up to the closed part 32b before the side end part of a commutator 60 in the storing direction of the brush 40, and a brush holder recessed part 22a or a brush recessed part which permits the brush 40 to rotate around the closed part 32b and travel is formed at a part on the side facing an inserting hole 32b. As a result, the brush 40 can be moved to the commutator 60 side through rotation and traveling, so that electric power can continue to be supplied from such a condition that the service life of the brush is regarded as finished, and it is possible to prolong the service life of the brush 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush device for a rotating electric machine used for a vehicle or the like.

[0002]

2. Description of the Related Art To supply power to a rotating electric machine used in a vehicle or the like, a brush connected to a pigtail, which is a power supply line, is housed in a brush holder, and the brush is urged by a spring or the like to be fixed to an armature. It is performed in contact with. Here, the pigtail is attached to the rear part of the anti-commutator side so as to maximize the wear length of the brush, but it is attached at a distance from the rear end part in order to prevent falling off from the brush, and as a result, Thus, the effective wear length of the brush is reduced. The brush holder is provided with an insertion hole through which the pigtail is inserted in the direction of accommodating the brush, but the insertion hole is opened to the commutator when the effective wear length has a sufficient margin for the required wear length. Except in the case where the brush is worn, the insertion hole is opened up to the end of the commutator side so that the brush does not fall out of the brush holder after the end of the effective wear of the brush. Therefore, in such a configuration that connects the pigtails and does not open the insertion holes of the pigtails,
In particular, in the case of a rotating electric machine having a small diameter such as a small-diameter rotating electric machine, the effective wear length is extremely short with respect to the actual length of the brush, and cannot meet the demand for a long life.

[0003]

This problem can be solved by increasing the length of the brush. However, as a result, the diameter of the rotating electric machine becomes large, which is contrary to the demand for miniaturization of today, and is almost adopted. Not something.

Accordingly, an object of the present invention is to increase the effective wear length of the brush without increasing the brush length in a configuration in which the pigtail is connected to the brush and the insertion hole of the pigtail is not opened.

[0005]

According to a first aspect of the present invention, there is provided a brush holder arranged around a commutator, a pigtail connected to a non-commutator side, and slidably housed in the brush holder and attached by a spring. In a brush device of a rotating electrical machine including a brush that is urged and abuts on a commutator, a pigtail insertion hole is formed in the brush holder so as to communicate with a closing portion in front of a commutator side end in a brush receiving direction, and further, at least the insertion is performed. The gist is that a brush holder concave portion or a brush concave portion that enables the brush to rotate around the closed portion as a rotation center is provided at a portion facing the hole.

According to a second aspect of the present invention, in the brush device for a rotary electric machine according to the first aspect, at least a part of the recess of the brush holder faces the anti-commutator side with a commutator side end having a depth of 0. The gist is that it is formed so as to be gradually deepened in a tapered shape.

According to a third aspect of the present invention, in the brush device for a rotating electrical machine according to the first and second aspects, at least a part of the brush concave portion has a non-commutator-side end having a maximum depth, and is provided on the commutator side. The point is that the taper is formed so as to gradually become shallower.

[0008]

According to the first aspect of the present invention, the brush holder arranged around the commutator, the pigtail is connected to the non-commutator side, and the brush holder is slidably housed in the brush holder and is urged by the spring to be urged by the spring. In the brush device of the rotary electric machine having a brush that abuts on the brush holder, a pigtail insertion hole is formed in the brush holder so as to communicate with the closing portion in front of the commutator side end in the brush receiving direction, and further, at least faces the insertion hole. Since the brush holder concave portion or the brush concave portion which enables the brush to rotate around the closed portion is provided at the side portion, the brush moves toward the commutator while rotating around the closed portion at the end of the commutator side. The effective wear length can be increased.

According to the second aspect of the present invention, at least a part of the concave portion of the brush holder is formed so as to gradually become deeper in a tapered shape toward the anti-commutator side with the end at the commutator side being 0 in depth. Therefore, in addition to the above effects, the brush can be slidably accommodated in the brush holder when the brush is initially mounted, and further, the brush can be slidably accommodated in the taper direction after the rotational movement. be able to.

According to the third aspect of the present invention, at least a part of the brush concave portion is formed so as to gradually become shallower in a tapered shape toward the commutator with the end on the anti-commutator side having the maximum depth. Therefore, the same effect as the second aspect of the invention can be obtained. Further, when the brush holder concave portion of the second aspect and the brush concave portion of the third aspect are formed at the same time, the brush can be more stably slidably housed in the brush holder when the brush is initially mounted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. First, the first embodiment is shown in FIG.
2 (a), 2 (b) and 2 (c).

FIG. 1 is a schematic view showing a brush device 10 according to the present invention mounted on a motor housing 50. FIG.
(A), (b), (c) is a cross-sectional view in the AA direction of the first embodiment of the present invention relating to the brush device 10 of FIG. This shows a state in which the brush life has ended due to the progress of wear of the wear length, and a state in which the brush rotates around a closed portion described later to continue power supply.

As shown in FIG. 1, the brush device 10 of this embodiment includes a brush 40 for connecting a pigtail 42 to a rear end thereof.
A coil spring 70 for urging the brush 40 against the commutator 60, a side wall 34 having a U-shaped cross section for holding the brush 40, an upper wall 32, and a rear plate 36 for closing the coil spring 70 are provided. Metal box holder 30, bottom 22 of brush holder 80
And the box holder 30 and the brush holder 8
0, and a substrate 2 for holding the above-mentioned components and the like.
0, etc. Here, the upper wall 32 of the brush box holder 30 is provided with an insertion hole 32a through which the pigtail 42 is inserted so as to communicate with the closing portion 32b in front of the end of the commutator 60 in the brush housing direction.

In the first embodiment of the present invention, as shown in FIGS. 2A and 2B, the substrate 20 which is the end of the upper wall 32 of the brush box holder 30 on the side of the commutator 60 and faces the insertion hole 32a. Closed portion 32
A brush holder recess 22a is formed so that the end of the commutator side that enables the rotational movement of the brush 40 with the rotation center b as the depth of 0 is tapered 22b toward the anti-commutator 60 side with a depth of 0. I have.

According to the configuration of the first embodiment described above, the brush 40 can be moved toward the commutator 60 while rotating about the closed portion 32b at the end of the commutator 60, so that the conventional brush life is ended. , Power supply can be continued. Also, the brush holder recess 22a
The brush 40 is formed so as to have a depth of 0 at the end of the commutator 60 and gradually taper 22b toward the anti-commutator 60, so that the brush 40 is stably held in the brush holder 80 when the brush 40 is initially mounted. And can be slidably accommodated.
Because of b, the brush 40 can be slidably accommodated in the taper direction after the rotational movement.

Next, a second embodiment will be described with reference to FIG.
This will be described with reference to (b) and (c). 2 (a), (b),
(C) is a cross-sectional view in the AA direction of the second embodiment of the present invention according to the brush device 10 of FIG. 1 similarly to the first embodiment of the present invention. End of brush life due to wear progress of brush effective wear length, closed part 3
This shows a state in which the brush 40 rotates around 2b to continue power supply. Therefore, the description of the common items related to FIG. 1 is omitted.

In the second embodiment of the present invention, as shown in FIGS. 3A and 3B, the brush 4 is in contact with the bottom portion 22 of the substrate 20, which is the portion facing the upper wall 32 of the brush box holder 30.
0, the end of the end of the commutator 6 that allows the brush 40 to rotate around the closed portion 32b as the center of rotation is set to the maximum depth.
A brush recess 40a is provided which is formed so as to gradually become shallow in a tapered shape 40b toward the 0 side.

According to the configuration of the second embodiment described above, a part of the brush recess 40a gradually becomes shallow in the tapered shape 40b toward the commutator 60 with the end on the side opposite to the commutator 60 having the maximum depth. Because it is formed in
The same effects as those of the first embodiment of the present invention can be obtained.

Further, it is possible to simultaneously form the recesses 22a and 40a of the first and second embodiments of the present invention. In this case, the depth of each of the recesses 22a and 40a is reduced to about half, so that the brush can be more stably slidably housed in the brush holder 90 when the brush 40 is initially mounted.

[0020]

As is apparent from the above description, according to the present invention, the provision of the recess allows the brush to move toward the commutator while rotating around the closed portion at the end of the commutator. Power can be continuously supplied from the state in which the brush life has expired, and the life of the brush can be extended. In addition, by forming each concave portion in a tapered shape, the brush can be stably slidably accommodated at the time of initial mounting of the brush as well as after rotational movement.

[Brief description of the drawings]

FIG. 1 is a schematic view of a brush device mounted on a motor housing.

FIG. 2 shows A of the first embodiment of the present invention relating to the brush device of FIG. 1;
-A direction sectional drawing.

FIG. 3 is a cross-sectional view taken along the line AA of a second embodiment of the present invention according to the brush device 10 of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Brush device, 20 ... Substrate, 22 ... Bottom part, 22
a: brush holder recess, 22b ... tapered surface, 30 ...
Brush box holder, 32: upper wall, 32a: insertion hole, 32b: closing part, 34: side wall, 36: rear plate,
40 brush, 40a brush recess, 40b tapered surface, 42 pigtail, 50 housing, 60
Commutator, 70 ... Coil spring, 80, 9
0 ... brush holder

Claims (3)

[Claims] 1. A rotary electric machine comprising: a brush holder disposed around a commutator; and a brush connected to a pigtail on an anti-commutator side and slidably housed in the brush holder and urged by a spring to contact the commutator. In the brush device, a pigtail insertion hole is formed in the brush holder so as to communicate with the closing portion in front of the commutator side end in the brush receiving direction, and further, the closing portion is rotated at least at a portion facing the insertion hole. A brush device for a rotating electric machine, wherein a brush holder concave portion or a brush concave portion is provided at a center thereof so that the brush can be rotationally moved. 2. The brush holder according to claim 1, wherein at least a part of the brush holder recess is tapered toward the anti-commutator side with a depth of 0 at a commutator side. 2. The brush device for a rotating electric machine according to claim 1. 3. The brush concave portion is formed so that at least a part of the brush concave portion is tapered gradually toward the commutator side with a maximum depth at an end opposite to the commutator side. A brush device for a rotating electric machine according to claim 2.