JPH04281353A - Brush unit for electric rotating machine and electric rotating machine provided with brush unit - Google Patents

Abstract

PURPOSE:To obtain a brush unit for electric rotating machine in which a brush and a commutator can be connected with a predetermined energizing force through simple structure and operation when an electric rotating machine is assembled. CONSTITUTION:A brush 10 is mounted in a brush holder 12 while being energized by an energizing section 32. When a rotor is assembled, the brush 10 is stopped by a hook section 34 mounted on a rotor contacting section 36 which is bent by means of the rotor thus stopping the brush 10 while resisting against the energizing force exerted from the energizing section 32. When the rotor contacting section 36 is bent through assembly operation of the rotor 20, the hook section 34 is released. Consequently, the brush 10 is brought into contact with a commutator 18 with a predetermined energizing force by means of the energizing section 32.

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 electrical machine that brings a brush into contact with a commutator by the biasing force of a biasing means, and a rotating electrical machine equipped with such a brush device.

0002

2. Description of the Related Art Generally, in a rotating electric machine, a brush is brought into contact with a commutator by the biasing force of a biasing means in order to always maintain a stable electrical connection state.

FIGS. 7 and 8 show a procedure for attaching a conventional brush device to a commutator.

As shown in FIG. 7, the brush 10 is loaded into a brush holder 12, and the pigtail 14 of the brush 10 is pulled out from a notch formed in the upper part of the brush holder 12. The brush holders 12 are mounted on the inulator 16, and although only one is shown to simplify the drawing, two brush holders are usually provided facing each other.

The rotor 20 provided with the armature 19 and commutator 18 is inserted into the hole 16a formed in the center of the insulator 16 from above in the figure, and the rotor 20 is assembled.

Thereafter, as shown in FIG. 8, the work of assembling the spring 22, which is the biasing means, is performed. This assembly work involves attaching the spring 22 to a spring attachment protrusion 24 formed on the insulator 16 so as to protrude upward, and attaching one arm 22a of the two arms of the spring 22 to the locking protrusion 12a of the brush holder 12. The other arm 22b is locked to the rear end surface of the brush 10, and the brush 10 is biased toward the commutator 18.

As a result, the brush 10 is moved by the urging force of the two arms 22a and 22b of the spring 22.
It protrudes from the brush holder 12 and comes into contact with the commutator 18 with a predetermined biasing force.

[0008]

However, in the conventional brush device described above, the spring 22, which is the biasing means for the brush 10, is attached after the rotor 20 is assembled. Therefore, until the brush 10 is biased by the attachment of the spring 22, the brush 10 moves freely within the brush holder 12, and its position is unstable. Therefore, when the rotor 20 is assembled, if the brush 10 protrudes from the brush holder 12 toward the hole 16a of the insulator 16, the rotor 20 collides with the brush 10 due to the insertion operation of the rotor 20, and the brush 10
There was a risk of damaging the.

Furthermore, after the rotor 20 is assembled, a separate process for assembling the spring 22 is required, which poses a problem in that the rotating electric machine assembly process cannot be speeded up.

Furthermore, when installing the spring 22, the arm 22a may catch the pigtail 14 pulled out from above the brush holder 12.
The movement of the brush 10 in the direction of the commutator 18 based on the biasing force may be insufficient, and there is a possibility that the brush 10 may not be sufficiently biased against the commutator 18.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the risk of damaging the brushes during rotor assembly work, and to prevent damage to the brushes when assembling the rotor. An object of the present invention is to provide a brush device for a rotating electric machine that can speed up the assembly work of a rotating electric machine, and a rotating electric machine that can effectively use the functions of the brush device.

0012

[Means for Solving the Problems] In order to achieve the above object, a brush device for a rotating electric machine according to the present invention includes a brush, a biasing section that biases the brush toward a commutator, and a brush and a biasing section for biasing the brush toward a commutator. In a brush device for a rotating electric machine, the brush holder is in contact with a part of the rotor during assembly of the rotor, and is pushed into the brush holder in the axial direction of the rotor as part of the assembly operation. A bendable rotor abutting part is provided, and the rotor abutting part is used to prevent the brush from coming off against the urging of the urging part before the bending operation, and to prevent the brush from coming off against the urging of the urging part before the bending operation. The present invention is characterized by the provision of a hook portion that releases the brush from coming off and brings the brush into contact with the commutator.

[0013] Furthermore, the rotating electrical machine equipped with the brush device according to the above invention rotates in a direction opposite to the direction of the pushing operation after the pushing operation in the axial direction of the rotor, which is the bending operation of the rotor contact portion. It is characterized by including a return adjusting means for returning the child by a minute distance.

[0014]

[Operation] According to the brush device for a rotating electric machine having the above-mentioned structure as the first aspect of the invention, the brush can be loaded in advance into the brush holder while receiving the biasing force from the biasing portion. In this case, the brush is set in a state where it resists the urging force by a hook portion provided on the rotor abutting portion of the brush holder. That is, the hook portion prevents the brush from coming off.

[0015]The rotor abutting portion is bent by a pushing operation in the axial direction, which is an assembly operation of the rotor. When this bending operation is performed, the hook portion releases the brush from coming off. Therefore, the brush is pushed toward the commutator by the urging force of the urging section and comes into contact with the commutator.

[0016] Accordingly, before the rotor attachment operation, the brushes are held in the brush holder by the hook portions, and only protrude toward the commutator when the rotor is pushed in. Therefore, the risk of the rotor colliding with the brushes and damaging the brushes can be effectively eliminated. Furthermore, since the biasing force of the spring is applied to the brushes at the same time as the rotor is assembled, there is no need for a spring assembly process after the rotor is assembled. Further, since the biasing portion is attached in advance, there is no problem of the pigtail of the brush getting caught when the biasing portion is attached.

[0017] Next, according to a second aspect of the present invention, a rotating electric machine equipped with the brush device described above is provided with the brush device according to claim 1, and is also provided with return adjustment means,
By this means, the rotor can be moved back by a minute distance after the rotor is pushed in. The push-in motion of the rotor is performed in one axial direction, and the return motion is performed in the opposite axial direction to the push-in motion.

[0018] With this, the rotor whose rotor abutting portion has been bent by the pushing operation is reliably separated from the rotor abutting portion by a minute distance by being returned to the rotor. This separation action avoids the risk of contact between the rotor and the rotor contact portion of the brush holder when the rotor rotates, and the function of the brush device according to claim 1 can be more reliably exerted. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial schematic sectional view of a rotating electrical machine equipped with a brush device according to the present invention, showing a state in which a rotor 20 is being assembled. In the drawings, the same elements as in the conventional device described above are given the same reference numerals. Two brush devices 30 are provided on the insulator 16 to face each other.

FIG. 2 is a perspective view showing how two brush devices 30 are installed on the insulator 16.

In this embodiment, the brush holder 12 of each brush device 30 is formed into a cylindrical shape with a rectangular cross section and an open end. Each brush holder 12 is arranged such that its openings face each other through a hole 16a, and one side wall thereof is attached and fixed to an insulator 16. The brush holder 12 has a hole 16 from one side wall thereof.
A rotor contact plate 36 is provided extending toward the a side. The rotor contact plate 36 is a member that is easily bent.
It is also made of a material with a low elastic modulus that maintains its bent state.

A spring 32, which is a biasing portion, is loaded inside the brush holder 12. And brush 10
is loaded into the brush holder 12 in a state where the spring 32 is pressed, and one end thereof is stopped by a hook 34 provided on the rotor contact plate 36. That is, the hook 34 is provided to protrude from the upper surface of the rotor contact plate 36 of the brush holder 12, and the end of the brush 10 is attached to the hook 3.
4 is locked.

Next, the operation of the embodiment will be explained based on FIGS. 3 and 4.

From the state of the rotor 20 shown in FIG. 1 above,
A push-in operation, which is an assembly operation, of the rotor 20 is performed until the state shown in FIG. 3 is reached. In this state, the lower end side portion 40 in the figure of the commutator 18 provided on the rotor 20 comes into contact with the rotor contact plate 36, and the rotor contact plate 36 is moved by the pushing motion of the rotor 20 as shown in the arrow. It is bent in 100 directions. Due to this bending action, the position of the hook 34 is shifted downward, so that the end of the brush 10 is no longer locked by the hook 34. By this release, the brush 10 is pushed out from the brush holder 12 by the biasing force of the spring 32, and is brought into contact with the commutator 18 with a predetermined biasing force.

The bending operation of the rotor abutment plate 36 must always be performed accurately so that the hook 34 is reliably displaced downward by the bending.
The rotor abutting plate 36 has a side portion shown in FIG. 5(A).
A notch 38 as shown in (B) or (C) is formed. Figures (A), (B), and (C) each show an example in which the notches 38 are formed with different widths.

[0027] Note that the hook 34 in FIGS.
As shown in the cross-sectional views of the respective portions shown in FIGS. 3(D) and 3(E), both sides are bent upward to form a substantially U-shape.

Next, the return operation of the rotor 20 by the return adjusting means (not shown in this figure) will be explained based on FIG.

During the assembly operation, the rotor 20 is pushed in the direction of arrow 200, which is the axial direction. Then, the rotor abutting plate 36 is bent, and its tip is moved to the line X in the figure. Here, the return adjustment means causes the return operation by a minute distance in the direction of arrow 300, which is the opposite axial direction. By this return adjustment operation, the rotor abutting portion of the bent rotor abutting plate 36, that is, the lower end portion 40 of the commutator 18, becomes separated from the bent rotor abutting plate 36. Thereby, there is no fear that the rotor 20 will come into contact with the rotor contact plate 36 even during its rotation operation, and the rotation operation can be performed accurately.

FIG. 6 is a diagram showing a schematic configuration of a rotating electrical machine equipped with a brush device and return adjustment means according to the first invention of the present application, and particularly shows an example of the return adjustment means. First, as shown in FIG. 2A, the assembly operation of the rotor 20 to the gear housing 42 in which the insulator 16 and the brush device 30 are provided is shown. As shown, the rotor 20 is pushed in the direction of arrow 400. Through this operation, the brush 10 is brought into contact with the commutator 18 (not shown) with a predetermined biasing force as described above. Further, at this time, the lowest end of the rotor 20 is pushed in to the position X shown in FIG. 4 (the position where one end side of the rotating shaft of the rotor 20 is supported by one thrust bearing).

Next, as shown in Figure (B), the yoke 46 with the magnet 44 attached to the inner wall
It is covered from above.

[0032] Then, as shown in Figure (C), the yoke 46
is set, the magnetic force of the magnet 44 attached to the inner wall of the yoke 46 is applied to the armature 19 of the rotor 20, and the rotor 20 moves over a minute distance Y (see FIG. 4).
is returned upward, and its position becomes stable. in this way,
By adjusting the position of the magnet 44 inside the yoke 46 to a predetermined position, when installing the yoke 46,
The return operation of the rotor 20 can be performed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the invention. For example, the hook portion provided on the rotor contact plate 36 is not limited to the one shown in FIG. is possible.

Further, the return adjustment means for the rotor 20 is not limited to the example shown in FIG. 6; for example, when the tip of the rotor 20 reaches the position
A thrust bearing may be formed so that the tip end side can be pushed back by a minute distance Y.

Furthermore, the number of brush devices provided in the rotating electrical machine is not limited to the example shown in FIG.

[0036]

As explained above, according to the brush device for a rotating electric machine according to the present invention and the rotating electric machine equipped with the device, rectification can be easily and quickly performed without damaging the brushes during the rotor assembly operation. The child can be brought into contact with a predetermined urging force. Thereby, in the manufacturing process of the rotating electric machine, the connection state of the brush to the commutator can be made better and more reliable.

[0037] Furthermore, according to the rotating electric machine provided with the rotor return adjusting means, the effect of the brush device can be effectively exhibited, and the rotor can be separated from the brush device after the rotor is installed. , it is possible to reliably eliminate the negative influence of the brush device on the rotation of the rotor.

[Brief explanation of the drawing]

FIG. 1 is a partial schematic sectional view of a rotating electrical machine equipped with a brush device according to an embodiment.

FIG. 2 is a partial perspective view of the rotating electrical machine showing a state in which the brush device according to the embodiment is attached.

FIG. 3 is a partial cross-sectional view of the rotating electric machine showing a rotor pushing operation.

FIG. 4 is a partial cross-sectional view of the rotating electric machine showing a return adjustment operation of the rotor.

FIGS. 5A to 5E are explanatory diagrams showing various modifications of the rotor contact plate according to the embodiment.

FIGS. 6A, 6B, and 6C are explanatory diagrams showing an example of a return adjustment means.

FIG. 7 is a partial perspective view of a rotating electrical machine showing the installation and configuration of a conventional brush device.

FIG. 8 is a partial perspective view of a rotating electrical machine showing the installation and configuration of a conventional brush device.

[Explanation of symbols]

10 Brush 12 Brush holder 14 Pigtail 16 Insulator 18 Commutator 20 Rotor 30 Brush device 32 Spring 34 Hook 36 Rotor contact plate
AS008401

Claims (2)

[Claims] 1. A brush device for a rotating electric machine including a brush, a biasing part that biases the brush toward a commutator, and a brush holder that holds the brush and the biasing part, wherein the brush holder has a A rotor abutting part is provided that comes into contact with a part of the rotor when assembling the child and is bent by the pushing operation in the axial direction of the rotor, which is the assembling operation. A hook portion is provided at the front to prevent the brush from coming off against the urging of the urging portion, and after the bending operation, releases the prevention from the brush and brings the brush into contact with the commutator. Characteristic brush device for rotating electric machines. 2. A brush device for a rotating electric machine according to claim 1, wherein after a push-in operation in the axial direction of the rotor, which is a bending operation of the rotor contact portion, the rotor is moved in a direction opposite to the push-in operation direction. A rotating electric machine, comprising: a return adjustment means for returning the same by a minute distance.