JPH09215278A - Brush for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily position a damper relative to a brush by providing at least one projection which restricts the mounting position of the damper formed so as to rise up from a side near the center. SOLUTION: A brush 16 comprises a relatively thin brush portion 18 which is caulked to a notch portion 17a provided on the surface of a relatively thick terminal portion 17 and a damper 19 attached to the surface almost near the center of a brush portion 18. Particularly, the brush portion 18 is almost near the center in longitudinal direction, and a projection 18c is provided, which rises upward vertically at the side edge of a side. The projection 18c can be easily formed by bending the brush portion 18. Because of this, when adhering the damper 19, a side edge of the damper 19 contacts to the projection 18c provided at the side edge of -side of the brush portion 18 and can be positioned easily and accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a brush in a small motor for acoustics, for example.

[0002]

2. Description of the Related Art Conventionally, a brush has been used in a small motor, such as an acoustic motor, for supplying electric power to a drive coil wound around a core of a rotating rotor. Such a brush elastically abuts on a commutator made of a cylindrical conductor provided on the rotating shaft of the rotor, so that the drive coil is connected to the drive coil from an external power source through the brush and the commutator. It is designed to supply power.

The brush is constructed, for example, as shown in FIG. That is, in FIG. 4, the brush 1 is composed of a relatively thick terminal portion 2 and a relatively thin brush portion 3 which is crimped to a notch portion 2 a provided on the surface of the terminal portion 2.

The terminal portion 2 has a notch portion 2a protruding from the surface so that the brush portion 3 can be attached thereto, and an attachment hole 2b for fixing the brush portion 3 to a motor (not shown). Further, as shown in FIG. 5, the terminal portion 2 is formed by pressing or the like in a state where the plurality of terminal portions 2 are continuous by the frame 4. Then, the brush portions 3 are attached to the respective terminal portions 2 formed in a continuous state by the frame 4 as described above.

The brush portion 3 is made of an elastic material and is elongated in its entirety. One end of the brush portion 3 has a notch portion 2 of the terminal portion 2.
It has an engaging hole 3a to be engaged with a, and the other end is divided into a plurality (three in the case shown) to ensure contact with the commutator of the rotor in the motor. ing.

Here, in order to suppress the vibration of the brush 1 when the brush 1 is incorporated in a motor, the brush 1
A damper 5 is attached to the surface of the brush portion 3 at approximately the center. As shown in FIG. 5, the attachment of the damper 5 indicates the attachment position of the damper provided on the frame 4 with respect to each brush portion 3 attached to the terminal portion 2 formed in a continuous state. The mark 4a is used as a guide for the operation.

In this way, after the brush portions 3 are attached to the respective terminal portions 2 and the dampers 5 are attached to the respective brush portions 3, the connecting portions 2c,
By separating 2d from the frame 4, a plurality of brushes 1 can be constructed.

[0008]

However, in the brush 1 thus constructed, the damper 5 is positioned and attached to the brush portion 3 with the mark 4a provided on the frame 4 as a guide. Because,
Since it is difficult to accurately position the damper 5, the attachment position of the damper 5 may be displaced. Therefore, there is a case where the damper 5 comes into contact with a component such as a ring varistor forming the rotor of the motor due to the displacement of the attachment position of the damper 5.

In view of the above points, it is an object of the present invention to provide a motor brush in which a damper for suppressing vibration of the brush can be easily and accurately positioned with respect to the brush. .

[0010]

According to the present invention, a brush portion made of an elastic material is formed in an elongated shape, one end of which is fixedly held by a terminal portion, and the other end of which is on the rotor side of a motor. In a brush for a motor, which is capable of elastically contacting a commutator that is a power supply terminal, and is provided with a damper for suppressing vibration near substantially the center,
Formed to rise from one side near the center,
This is achieved by a motor brush, characterized in that it is provided with at least one protrusion for regulating the mounting position of the damper.

In the motor brush according to the present invention, one protrusion is preferably arranged so as to abut substantially the center of the damper in the longitudinal direction.

The motor brush according to the present invention is preferably provided with two protrusions so as to come into contact with each other near substantially both ends of the damper in the longitudinal direction.

In the motor brush according to the present invention, the height of each protrusion is preferably selected to be lower than the height of the damper.

According to the above structure, when the damper is attached to the vicinity of the center of the brush, the side edge of the damper is brought into contact with at least one protrusion rising from one side near the center of the brush. Thus, the damper is positioned with respect to the brush such that the side edge of the damper is aligned with the side edge on one side of the brush. As a result, the damper can be easily positioned at the predetermined mounting position.

Further, since the side edge of the damper is in contact with the protrusion rising from the side edge on one side of the brush,
It is possible to prevent the damper from protruding from the side edge on one side of the brush toward the outside due to the positional deviation. Therefore, when the brush is installed in the motor, the damper attached to the brush does not come into contact with some of the rotor components such as the commutator and the ring varistor in the motor.

When the height of each protrusion is selected to be lower than the height of the damper, the protrusion does not project above the damper in the vertical direction from the surface of the brush. When the brush is removed from the frame after mounting, the protrusion does not get caught on something during transportation.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a motor incorporating an embodiment of a motor brush according to the present invention.

In FIG. 1, the motor 10 includes a case 11
On the other hand, the rotor 13 rotatably supported by the bearing 12 and the magnet 14 disposed on the inner surface of the case 12
And a stator.

The case 11 has one end (the lower end in the case shown).
Is formed into an open hollow cylindrical shape, a bearing 12 such as a metal bearing is attached to the center of the other end, and one end thereof is closed by a bracket 15.

The rotor 13 has a rotating shaft 13a pivotally supported by the bearing 12, a core 13b fixed to the rotating shaft 13a and around which a driving coil (not shown) is wound, and a rotating shaft 13
It is composed of a commutator 13c for supplying power to the drive coil, which is provided near one end (a lower end in the figure) of a, and a ring varistor 13d for protection.

The bracket 15 is attached to the case 11 so as to close the lower end of the case 11, and supports the rotary shaft 13a as a thrust bearing.

Further, the bracket 15 supports a brush 16 for supplying electric power to the drive coil of the rotor 13. This brush 16 has a relatively thick terminal portion 17, a relatively thin brush portion 18 crimped by a notch portion 17 a provided on the surface of the terminal portion 17, and a surface of the brush portion 18 near the center thereof. It is composed of a mounted damper 19.

The terminal portion 17 has a notch portion 17a protruding from the surface so that the brush portion 18 can be attached thereto, and an attachment hole 17b for fixing the brush portion 18 to the bracket 15 of the motor 10. The terminal portion 17
Similarly to the terminal portion 2 of the conventional brush 1, is formed by pressing or the like in a state where the plurality of terminal portions 17 are continuous by the frame. Then, the brush parts 18 are attached to the respective terminal parts 17 formed in a continuous state by the frame in this way.

As shown in FIG. 2, the brush portion 18 is formed of an elastic material as a whole in an elongated shape.
Engagement hole 18a to be engaged with the notch portion 17a of the terminal portion 17
In addition, the other end 18b is divided into a plurality of pieces (three pieces in the case shown) in order to ensure the contact of the rotor 13 with the commutator 13c.

The damper 19 is made of, for example, synthetic rubber or the like, and a side edge on one side (front side in FIG. 2) of the brush portion 18 near the center in the longitudinal direction of the brush portion 18. It is positioned along with and is attached by sticking or the like.

The above construction is similar to that of the conventional brush 1 shown in FIG. 4, but in the brush 16 according to the embodiment of the present invention, the brush portion 18 is formed near the center in the longitudinal direction. A protrusion 18c that rises vertically upward is provided on one side edge. This projection 18
c can be easily formed by bending the brush portion 18 or the like. In this embodiment, the protrusion 18c
Is located near the center of the mounting position of the damper 19 in the longitudinal direction.

The tenth embodiment of the present invention is configured as described above, and by attaching the damper 19, the vibration of the brush portion 18 of the brush 16 can be suppressed. Therefore, when the brush 16 is incorporated into the motor 10, even if the brush 16 tries to vibrate due to the rotation of the rotor 13 of the motor 10, this vibration causes the damper 19 to move.
The vibration of the brush 16 can be suppressed by being damped by the action of.

Further, when the damper 19 is attached,
The side edge of the damper 19 is brought into contact with the protrusion 18c provided on the side edge on one side of the brush portion 18, whereby the damper 19 can be positioned easily and accurately. Also, damper 19
Since the side edge of the protrusion 18c does not protrude outward from the side edge on one side of the brush portion 18,
When the brush 16 is incorporated in the motor 10, the damper 1
It is possible to prevent a part of 9 from contacting a part of components of the rotor 13 of the motor 10, such as the ring varistor 13d.

FIG. 3 shows a main part of a motor incorporating another embodiment of the motor brush according to the present invention. In FIG. 3, the motor brush 20 incorporated in the motor 10 has substantially the same configuration as the motor brush 16 shown in FIGS. 1 and 2, but two protrusions 21 a and 21 b are provided on one side of the brush portion 21. Are different from each other in that they are provided side by side in the longitudinal direction along the side edge of the.

Here, the two protrusions 21a and 21b are attached to a damper 22 which is attached near the center of the brush portion 21.
On the other hand, it is located near both ends (in the figure, a position slightly inward from the right end and the left end).
As a result, the damper 22 has two protrusions 21a and 21b.
By abutting against, it is possible to align accurately along one side edge of the brush portion 21. Thus, the damper 22 can be positioned with respect to the brush portion 21 of the brush 20 and can be prevented from protruding due to displacement.

In the above embodiment, the brushes 16, 2
The brush portions 18 and 21 forming 0 have one protrusion 18c or two protrusions 21a and 21b respectively, but it is not limited to this, and it is obvious that three or more protrusions may be provided. is there.

[0032]

As described above, according to the present invention, when the damper is attached to the vicinity of the center of the brush, at least one side edge of the damper rises from one side near the center of the brush. By abutting against the protrusion, the damper is positioned with respect to the brush such that the side edge of the damper is aligned with the side edge on one side of the brush. As a result, the damper can be easily positioned at the predetermined mounting position.

Since the side edge of the damper is in contact with the protrusion rising from the side edge on one side of the brush,
It is possible to prevent the damper from protruding from the side edge on one side of the brush toward the outside due to the positional deviation. Therefore, when the brush is installed in the motor, the damper attached to the brush does not come into contact with some of the rotor components such as the ring varistor in the motor.

Thus, according to the present invention, it is possible to provide an extremely excellent motor brush in which the damper for suppressing the vibration of the brush can be easily and accurately positioned with respect to the brush. .

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the overall configuration of a motor incorporating an embodiment of a brush according to the present invention.

FIG. 2 is an enlarged perspective view showing a brush used in the motor of FIG.

FIG. 3 is a schematic cross-sectional view showing the main parts of a motor incorporating another embodiment of the brush according to the present invention.

FIG. 4 is a plan view showing an example of a brush used in a conventional motor.

5 is a schematic plan view showing a state where the brush of FIG. 4 is attached to a damper. FIG.

[Explanation of symbols]

 10 motor 11 case 12 bearing 13 rotor 13a rotating shaft 13b core 13c commutator 14 magnet 15 bracket 16 motor brush 17 terminal part 18 brush part 18c protrusion 19 damper 20 motor brush 21 brush part 21a, 21b protrusion

Claims (4)

[Claims] 1. A brush portion made of an elastic material is formed in an elongated shape, one end of which is fixedly held by a terminal portion, and the other end of which is elastically contacted with a commutator which is a rotor side power supply terminal of a motor. And a damper for suppressing vibration is provided in the vicinity of the center of the brush for a motor, which is formed so as to rise from one side near the center,
A motor brush, comprising at least one protrusion for restricting a mounting position of a damper. 2. The brush for motor according to claim 1, wherein one protrusion is provided so as to abut substantially the center of the damper in the longitudinal direction. 3. The motor brush according to claim 1, wherein the two protrusions are arranged so as to abut on substantially both ends of the damper in the longitudinal direction. 4. The brush for motor according to claim 1, wherein the height of each protrusion is selected to be lower than the height of the damper.