JP2003079108A - Brush unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush unit which suppresses a brush to rattle toward the rotative direction of a commutator. SOLUTION: In this brush unit 4, a brush 6 is housed in and held by a brush holder 5 stretching in the radial direction of a commutator 3, and the tip of the brush 6 is pressed against and is brought into contact with the commutator 3. The brush holder 5 is fitted with an elastic pressing piece 9d having elasticity, and a roller 10 is rotatably supported by supporting shafts 9e formed on the pressing piece 9d. The roller 10, having elasticity is pressed against and brought into contact with the side surface of the brush 6 by the elastic force of the elastic piece 9d. The roller 10 is rotated by the forward and backward movement of the brush 6.

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 bringing a brush into contact with a commutator of a motor.

[0002]

2. Description of the Related Art Conventionally, a DC motor is provided with a pair of brush devices as shown in FIG. In this brush device, a brush 93 is accommodated and held in a brush holder 92 extending in a radial direction of a commutator 91 provided on an armature (rotor) not shown, and a rear end portion of the brush 93 is biased by a coil spring 94. The tip of the brush 93 is pressed against the commutator 91.

In the brush device constructed as described above, since the brush 93 is in sliding contact with the commutator 91 during rotation of the rotor, a drive current from the outside is wound around the rotor, more specifically, the armature core. The wire is supplied via a brush 93 and a commutator 91.

By the way, in the brush device as described above, the inside of the brush holder 92 (inside surface) is a brush 93.
In consideration of the thermal expansion of the
It is set to have a gap when 3 is accommodated. Therefore, when the rotor is rotated for a long time, the brush 93
The brush holder 92 will not
It is prevented that the movement of the vehicle in the front-back direction is hindered.

[0005]

However, in the brush device as described above, for example, when the rotor (commutator 51) starts rotating (at the time of starting), the brush 9 is used.
3 may rattle in the rotation direction of the commutator 91 due to the frictional force with the commutator 91. In this case, one end of the tip of the brush 93 in the rotation direction of the commutator 91 is separated (raised) from the commutator 91, and the contact area between the brush 93 and the commutator 91 becomes small. Then the brush 93
Therefore, the drive current does not flow normally to the commutator 91. Therefore, in the motor as described above, especially when starting up,
There is a possibility that desired rotation characteristics may not be obtained.

Further, in the brush device as described above, for example, the brush 9 is rotated while the rotor (commutator 91) is rotating.
The frictional force of 3 with the commutator 91 may rattle and vibrate in the rotation direction of the commutator 91. Therefore, the motor as described above has a problem that noise is generated based on the vibration of the brush 93 during rotation.

The present invention has been made to solve the above problems, and an object thereof is to provide a brush device capable of suppressing rattling of the brush in the rotating direction of the commutator.

[0008]

According to a first aspect of the present invention, there is provided a brush device in which a brush is accommodated and held in a brush holder extending in a radial direction of a commutator, and a tip end portion of the brush is pressed into contact with the commutator. The rotating body is elastically pressed against the side surface of the brush and rotated by the forward and backward movement of the brush.

According to a second aspect of the present invention, in the brush device according to the first aspect, an elastic pressing piece having elasticity is provided on the brush holder, and the rotating body is attached to the side surface of the brush by the elastic pressing piece. It has elasticity and is brought into pressure contact.

According to a third aspect of the present invention, in the brush device according to the second aspect, the elastic pressing piece is integrally formed with the brush holder. According to a fourth aspect of the present invention, in the brush device according to the second or third aspect, the rotating body is a roller having a substantially cylindrical shape, and the elastic pressing piece is integrally formed with a support shaft insertable into the roller. The roller was supported by the support shaft.

The invention according to claim 5 is the invention according to claim 2 or 3.
In the brush device according to [1], the rotating body is a sphere,
A holding portion for restricting movement of the sphere in a direction other than the side surface direction of the brush is integrally formed on the elastic pressing piece, and the sphere is held by the holding portion and the side surface of the brush.

The invention according to a sixth aspect is the first to fifth aspects.
In the brush device according to any one of items 1 to 3, a plurality of the rotating bodies are provided in the front-rear direction of the brush. (Operation) According to the first aspect of the invention, the brush device is provided with the rotating body which is elastically pressed against the side surface of the brush and is rotated by the forward and backward movement of the brush. Therefore, the brush is prevented from rattling in the rotation direction of the commutator. Further, the rotating body is pressed against the side surface of the brush, but since the rotating body rotates with respect to the movement of the brush in the front-back direction, its resistance is small, and it is possible to prevent the movement of the brush in the front-back direction from being hindered. It

According to the second aspect of the present invention, the brush holder is provided with the elastic pressing piece having elasticity, and the rotating body is elastically pressed against the side surface of the brush by the elastic pressing piece. Contacted. Therefore, with a simple structure, the rotating body can be pressed and brought into contact with the side surface of the brush with elasticity.

According to the third aspect of the invention, since the elastic pressing piece is integrally formed with the brush holder, the rotating body is elastically pressed against the side surface of the brush while the number of parts is reduced. Can be made.

According to a fourth aspect of the present invention, the rotating body is a substantially cylindrical roller, and the elastic pressing piece is integrally formed with a support shaft insertable into the roller. The roller is supported. Since the support shaft for supporting the roller is integrally formed with the elastic pressing piece as described above, the roller (rotating body) can be supported while reducing the number of parts. Moreover, before the brush is assembled, the rotating body can be assembled in the brush holder in advance.

According to the fifth aspect of the present invention, the rotating body is a sphere, and the elastic pressing piece is integrally formed with a holding portion for restricting the movement of the sphere in a direction other than the lateral direction of the brush. The sphere is held by the side surfaces of the holding portion and the brush. Since the holding portion for holding the sphere is integrally formed with the elastic pressing piece as described above, the sphere (rotating body) can be held while reducing the number of parts.

According to the sixth aspect of the present invention, since the plurality of rotating bodies are provided in the front-rear direction of the brush, rattling of the brush in the rotating direction of the commutator is further suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is embodied in a DC motor will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, a DC motor 1 is arranged in the vicinity of the rotary shaft 2, a substantially cylindrical commutator (commutator) 3 fixed to the rotary shaft 2, and the commutator 3. A pair of brush devices 4 (one pair at 180 degree intervals) are provided. Then, each brush device 4 has a brush holder 5
And a brush 6 and a coil spring 7.

The brush holder 5 is composed of a resin substrate 8 fixed to a motor case (not shown), and a metal holder member 9 fixed on the substrate 8.
The holder member 9 is provided from the rear end portion of the rotation direction side wall 9a that is erected on the substrate 8 and extends in the radial direction of the commutator 3 (specifically, parallel to the radial direction) and the rotation direction side wall 9a that is erected on the substrate 8. Rear end wall 9b extending parallel to the tangent line of the commutator 3
An upper portion 9c formed to connect the rotation direction side wall 9a and an upper portion of the rear end wall 9b, and an elastic pressing piece 9d extending from the rear end wall 9b to the inner side in the radial direction of the commutator 3.

As shown in FIG. 2, the elastic pressing piece 9d has a lower end in the axial direction of the commutator 3 on the rear end wall 9b (see FIG. 2).
It extends from the middle and lower side. Also, the elastic pressing piece 9d
Has an elasticity and is formed so as to be inclined with respect to the rotation direction side wall 9a so as to approach the rotation direction side wall 9a toward the tip side in a state where no external force is applied (not shown). . A pair of support shafts 9e extending upward (in FIG. 2, upward) in the axial direction of the commutator 3 is formed on the tip side of the elastic pressing piece 9d. A pair of support shafts 9e
Are arranged side by side in the radial direction of the commutator 3. The support shaft 9e is chamfered at the corners of a quadrangular prism, as shown in the partially enlarged view of FIG. A roller 10 as a rotating body is rotatably supported on each support shaft 9e. Specifically, the roller 10 is formed of a metal material into a substantially cylindrical shape, and the support shaft 9e is rotatably supported by the support shaft 9e by inserting (freely fitting) the support shaft 9e into the center hole.

The brush 6 is formed in a substantially square pole shape and is housed and held in the brush holder 5. More specifically, in the brush holder 5, that is, in the space surrounded by the rotation direction side wall 9a, the elastic pressing piece 9d, the upper portion 9c, and the substrate 8,
The coil spring 7 and the brush 6 are inserted in this order,
Housed and held.

Here, the brush 6 and the coil spring 7
The dimensions of the respective members are set so that the coil spring 7 is compressed in the radial direction of the commutator 3 when assembled. Therefore, the rear end of the brush 6 is urged toward the commutator 3 by the coil spring 7, and the tip of the brush 6 is pressed against the commutator 3.

Further, the brush 6 and the coil spring 7 are assembled, and in a state where one side surface of the brush 6 (a side surface in the counterclockwise direction in FIG. 1) is in contact with the side wall 9a on the rotational direction side, the elastic pressing piece 9d is attached. The pair of rollers 10 both contact the other side surface (the side surface in the clockwise direction in FIG. 1) of the brush 6 so that the roller 10 is bent against its own elastic force and becomes substantially parallel to the side wall 9a on the rotation direction side. The dimensions of each member are set so as to be in contact with each other. Therefore, in this state, the roller 10 is elastically pressed against the other side surface of the brush 6 by the elastic force of the elastic pressing piece 9d, and one side surface of the brush 6 is rotated by the pressing force of the roller 10 on the side wall in the rotation direction. 9a is pressed and contacted.

At the rear end side of the brush 6, one end of a pigtail 11 is embedded so as to project from the upper surface thereof, and the other end of the pigtail 11 is connected to a control device (power supply device) not shown outside the DC motor 1. Connected.

In the DC motor 1 (brush device 4) configured as described above, the brush 6 is in sliding contact with the commutator 3, so that the brush 6 and the commutator 3 from the control device (power supply device) even when the rotor is rotating. A drive current is supplied to the rotor, more specifically, to the winding wound around the armature core (not shown).

Next, the characteristic effects of the first embodiment will be described below. (1) In the brush 6, the roller 10 is elastically pressed against the other side surface, and one side surface of the brush 10 is in the rotational direction side wall 9a.
Is pressed into contact with. Therefore, the rotor (commutator 3)
Even if the brush 6 makes sliding contact with the commutator 3 during the rotation of 1, the rattling of the brush 6 in the rotation direction of the commutator 3 is suppressed. As a result, the contact between the tip of the brush 6 and the commutator 3 is always maintained, and the supply of the drive current to the rotor, specifically, the winding wound around the armature core (not shown) is maintained. Therefore, in this DC motor 1, it is possible to obtain a desired rotation characteristic especially at the time of starting. Further, the generation of noise due to the vibration of the brush 6 is reduced.

The roller 10 is pressed against the other side surface of the brush 6, but since the roller 10 rotates with respect to the movement of the brush 6 in the front-back direction (the radial direction of the commutator 3), its resistance is small. It is prevented that the movement of the brush 6 in the front-rear direction is hindered. Further, even when the brush 6 becomes hot and slightly expands when the rotor is rotated for a long time, the elastic pressing piece 9d only flexes slightly, and the forward and backward movement of the brush 6 is prevented. It Therefore, the brush 6
It is possible to prevent the pressing force of the commutator 3 from decreasing.

(2) The brush holder 5 is provided with an elastic pressing piece 9d having elasticity, and the roller 10 is connected by the elastic pressing piece 9d.
Is pressed against the side surface of the brush 6, the roller 10 (rotating body) can be pressed against the side surface of the brush 6 with elasticity with a simple configuration.

(3) Attach the elastic pressing piece 9d to the brush holder 5
Since it is integrally formed with the holder member 9 constituting the above, the roller 10 can be pressed and contacted to the side surface of the brush 6 with elasticity while reducing the number of parts.

(4) A roller 10 having a substantially cylindrical shape is used as a rotating body, a support shaft 9e which can be inserted into the roller 10 is integrally formed on the elastic pressing piece 9d, and the roller 10 is supported by the support shaft 9e. Thus, since the support shaft 9e that supports the roller 10 is integrally formed with the elastic pressing piece 9d, it is possible to support (hold) the roller 10 (rotating body) while reducing the number of parts. Moreover, before the brush 6 is assembled, the roller 10 can be assembled to the brush holder 5 in advance. As a result, it becomes easy to manage the parts and assemble the brush 6, and the manufacturing cost can be reduced.

(5) Since a plurality of rollers 10 are provided in the front-back direction of the brush 6 (radial direction of the commutator 3), rattling of the brush 6 with one of the front-back directions as a fulcrum is suppressed, and the brush 6 is used as the commutator 3. Rattling in the direction of rotation is further suppressed.

(Second Embodiment) A second embodiment in which the present invention is embodied in a DC motor will be described below with reference to FIGS. 3 and 4. In the second embodiment, mainly the first
Since only the holder member 9 and the roller 10 (rotating body) of the embodiment are different from each other, the same members are denoted by the same reference numerals and detailed description thereof will be partially omitted.

The brush holder 21 is composed of a resin substrate 8 fixed to a motor case (not shown), and a metal holder member 22 fixed on the substrate 8. The holder member 22 is erected on the substrate 8 and extends in the radial direction of the commutator 3 (specifically, parallel to the radial direction).
A rear end wall 22b extending from the rear end of 2a in parallel with the tangent to the commutator 3, a side wall 22a in the rotational direction, and a rear end wall 22b.
An upper part 22c formed so as to connect the upper parts of the above, and an elastic pressing piece 22d extending from the rear end wall 22b to the inside of the commutator 3 in the radial direction.

The elastic pressing piece 22d is, as shown in FIG.
The rear end wall 22b extends from the axial center (center in FIG. 4) of the commutator 3. Further, the elastic pressing piece 22d is elastic and is formed to be inclined with respect to the rotation direction side wall 22a so as to approach the rotation direction side wall 22a toward the tip side in a state where no external force is applied. (Not shown). Further, when viewed from the axial direction of the commutator 3 (see FIG. 3), the tip end side of the elastic pressing piece 22 d has a U-shaped U-shaped portion 22 opened to the side wall 22 a in the rotational direction.
e is formed. Then, inside the brush holder 21, that is, the side wall 22a in the rotation direction, the elastic pressing piece 22d, and the upper portion 22.
In the space surrounded by c and the substrate 8, the brush 6, the coil spring 7, and the three round bars 23 as the rotating body are housed and held.

More specifically, the three round bars 23 are formed of a metal material into a substantially cylindrical shape, and are arranged between both ends of the U-shaped portion 22e (in the radial direction of the commutator 3), and each of them is arranged. Part of the U-shaped portion 22e is disposed so as to project from the opening of the U-shaped portion 22e toward the side wall 22a in the rotation direction, and each of them is rotatable. The coil spring 7 is arranged so that one end of the coil spring 7 contacts the rear end wall 22b. Further, the brush 6 is arranged so that its rear end contacts the other end of the coil spring 7, and the side wall 2 on the rotation direction side is formed.
It is arranged between 2a and three round bars 23.

Here, the brush 6 and the coil spring 7
The dimensions of the respective members are set so that the coil spring 7 is compressed in the radial direction of the commutator 3 when assembled. Therefore, the rear end of the brush 6 is urged toward the commutator 3 by the coil spring 7, and the tip of the brush 6 is pressed against the commutator 3.

Further, the brush 6 and the coil spring 7 are assembled, and one side surface of the brush 6 (side surface in the counterclockwise direction in FIG. 3) is in contact with the side wall 22a in the rotation direction,
The elastic pressing piece 22d is bent against its own elastic force so as to be substantially parallel to the rotation direction side wall 22a, and the three round bars 23 are both on the other side surface of the brush 6 (clockwise in FIG. 3). The dimension of each member is set so as to abut the side surface in the direction. Therefore, in this state, due to the elastic force of the elastic pressing piece 22d, the round bar 23 elastically presses and contacts the other side surface of the brush 6, and the pressing force of the round bar 23 causes one side surface of the brush 6 to rotate. It is pressed against the side wall 22a.
In this state, the upper portion 22c is formed so as to cover the upper side (upper side in FIG. 4) of the round bar 23. ) Are restricted from moving to.

In the DC motor (brush device) having such a structure, since the brush 6 is in sliding contact with the commutator 3, the control device (power supply device) passes through the brush 6 and the commutator 3 even when the rotor rotates. The rotor,
Specifically, the drive current is supplied to the winding wound around the armature core (not shown).

Next, the characteristic effects of the second embodiment will be described below. (1) The round bar 23 is elastically pressed against the other side surface of the brush 6, and one side surface of the brush 6 is pressed against the rotation direction side wall 22a. Therefore, even if the brush 6 makes sliding contact with the commutator 3 during rotation of the rotor (commutator 3), the brush 6 is prevented from rattling in the rotation direction of the commutator 3. As a result, the contact between the tip of the brush 6 and the commutator 3 is always maintained, and the supply of the drive current to the rotor, specifically, the winding wound around the armature core (not shown) is maintained. Therefore, in this DC motor, a desired rotation characteristic can be obtained especially at the time of starting. Also, brush 6
The generation of noise due to the vibration of is reduced.

Further, the round bar 23 is pressed against the other side surface of the brush 6, but since the round bar 23 rotates with respect to the movement of the brush 6 in the front-back direction (radial direction of the commutator 3), the resistance thereof is reduced. The small size prevents the movement of the brush 6 in the front-back direction from being hindered. Further, even if the brush 6 becomes hot and slightly expands when the rotor rotates for a long time, the elastic pressing piece 22d
Only slightly bends, which prevents the movement of the brush 6 in the front-back direction from being hindered. Therefore, it is possible to prevent the pressing force of the brush 6 on the commutator 3 from decreasing.

(2) An elastic pressing piece 22d having elasticity is provided on the brush holder 21, and the round bar 2 is formed by the elastic pressing piece 22d.
Since 3 is pressed into contact with the side surface of the brush 6, the round bar 23 (rotating body) can be pressed into contact with the side surface of the brush 6 with elasticity with a simple configuration.

(3) Since the elastic pressing piece 22d is integrally formed with the holder member 22 constituting the brush holder 21, the round bar 23 is elastically pressed against the side surface of the brush 6 while the number of parts is reduced. be able to.

(4) Since a plurality of round bars 23 are provided in the front-rear direction of the brush 6 (radial direction of the commutator 3), rattling of the brush 6 with one of the front-rear direction as a fulcrum is suppressed, and the brush 6 is commutated. The rattling in the rotational direction of 3 is further suppressed.

(Third Embodiment) A third embodiment in which the present invention is embodied in a DC motor will be described below with reference to FIGS. In the third embodiment, mainly the first
Since only the holder member 9 and the roller 10 (rotating body) of the embodiment are different from each other, the same members are denoted by the same reference numerals and detailed description thereof will be partially omitted.

The brush holder 31 is composed of a resin substrate 8 fixed to a motor case (not shown), and a metal holder member 32 fixed on the substrate 8. The holder member 32 is erected on the substrate 8 and extends in the radial direction of the commutator 3 (specifically, parallel to the radial direction).
A rear end wall 32b extending from the rear end of 2a in parallel with the tangent of the commutator 3, a side wall 32a in the rotational direction, and a rear end wall 32b.
Upper part 32c formed so as to connect the upper parts of the above, and an elastic pressing piece 32d extending from the rear end wall 32b to the inside of the commutator 3 in the radial direction.

The elastic pressing piece 32d is, as shown in FIG.
The rear end wall 32b extends from the axial center of the commutator 3 (center in FIG. 6). Further, the elastic pressing piece 32d is formed to be inclined with respect to the rotation direction side wall 32a so as to be closer to the rotation direction side wall 32a toward the tip end side in a state where it has elasticity and no external force is applied. (Not shown). In addition, a holding portion 32e that is recessed in a substantially quadrangular shape is formed on the tip end side of the elastic pressing piece 32d so as to open toward the side wall 32a in the rotation direction. Holding part 3
2e is a state in which the sphere is housed, and a side wall 3 in the rotation direction of the sphere is shown.
Restrict movement in directions other than the 2a direction. Then, in the brush holder 31, that is, in the space surrounded by the rotation direction side wall 32a, the elastic pressing piece 32d, the upper portion 32c, and the substrate 8, the brush 6, the coil spring 7, and the three spheres 33 as the rotating body are provided. Are housed and held.

More specifically, the three spheres 33 are made of a metallic material and are arranged in the holding portion 32e side by side in the radial direction of the commutator 3, and each part of them is held in the holding portion 3.
It is arranged so as to project from the opening of 2e toward the side wall 32a in the rotation direction, and each of them is rotatable. or,
The coil spring 7 is arranged so that one end of the coil spring 7 contacts the rear end wall 32b. The brush 6 is arranged such that its rear end contacts the other end of the coil spring 7, and is arranged between the rotation direction side wall 32a and the three spheres 33.

Here, the brush 6 and the coil spring 7
The dimensions of the respective members are set so that the coil spring 7 is compressed in the radial direction of the commutator 3 when assembled. Therefore, the rear end of the brush 6 is urged toward the commutator 3 by the coil spring 7, and the tip of the brush 6 is pressed against the commutator 3.

Further, the brush 6 and the coil spring 7 are assembled, and one side surface of the brush 6 (side surface in the counterclockwise direction in FIG. 5) is in contact with the side wall 32a on the rotational direction side.
The elastic pressing piece 32d is bent against its own elastic force so as to be substantially parallel to the side wall 32a in the rotational direction, and the three spherical bodies 33 are both on the other side surface of the brush 6 (clockwise direction in FIG. 5). The size of each member is set so as to abut the side surface of the member. Therefore, in this state, the elastic force of the elastic pressing piece 32d causes the spherical body 33 to elastically press and contact the other side surface of the brush 6, and the pressing force of the spherical body 33 causes one side surface of the brush 6 to rotate side wall. It is in pressure contact with 32a.

In the DC motor (brush device) configured as described above, since the brush 6 is in sliding contact with the commutator 3, the control device (power supply device) passes through the brush 6 and the commutator 3 even when the rotor rotates. The rotor,
Specifically, the drive current is supplied to the winding wound around the armature core (not shown).

Next, the characteristic effects of the third embodiment will be described below. (1) In the brush 6, the spherical body 33 is elastically pressed against the other side surface, and one side surface is pressed against the rotational direction side wall 32a. Therefore, even if the brush 6 makes sliding contact with the commutator 3 during rotation of the rotor (commutator 3), the brush 6 is prevented from rattling in the rotation direction of the commutator 3. As a result, the contact between the tip of the brush 6 and the commutator 3 is always maintained, and the supply of the drive current to the rotor, specifically, the winding wound around the armature core (not shown) is maintained. Therefore, in this DC motor, a desired rotation characteristic can be obtained especially at the time of starting. Also, brush 6
The generation of noise due to the vibration of is reduced.

The sphere 33 is pressed against the other side surface of the brush 6, but the sphere 33 rotates with respect to the movement of the brush 6 in the front-rear direction (radial direction of the commutator 3), so that the resistance thereof is small. It is prevented that the movement of the brush 6 in the front-rear direction is hindered. Further, even if the brush 6 becomes hot and slightly expands when the rotor rotates for a long time, the elastic pressing piece 32d
Only slightly bends, which prevents the movement of the brush 6 in the front-back direction from being hindered. Therefore, it is possible to prevent the pressing force of the brush 6 on the commutator 3 from decreasing.

(2) An elastic pressing piece 32d having elasticity is provided on the brush holder 31, and the spherical body 3 is formed by the elastic pressing piece 32d.
Since 3 is pressed into contact with the side surface of the brush 6, the spherical body 33 (rotating body) can be pressed into contact with the side surface of the brush 6 with elasticity with a simple configuration.

(3) Since the elastic pressing piece 32d is integrally formed with the holder member 32 which constitutes the brush holder 31, the spherical body 33 is elastically pressed against the side surface of the brush 6 while the number of parts is reduced. You can

(4) The spherical body 33 is used as the rotating body, and the elastic pressing piece 32d is integrally formed with the holding portion 32e for restricting the movement of the spherical body 33 in the direction other than the direction of the other side surface of the brush 6, and the holding portion 32e The sphere 33 was held on the other side surface of the brush 6. A holding portion 32e for holding the sphere 33 in this way
Is integrally formed with the elastic pressing piece 32d, it is possible to hold the spherical body 33 (rotating body) while reducing the number of parts.

(5) Since a plurality of spheres 33 are provided in the front-rear direction of the brush 6 (radial direction of the commutator 3), the brush 6 is suppressed from rattling with one of the front-rear directions as a fulcrum, and the brush 6 is commutated. Rattling in the direction of rotation is further suppressed.

The above embodiment may be modified and implemented as follows. -In each of the above embodiments, the brush holders 5, 21, 31
Elastic pressing pieces 9d, 22d, 32d having elasticity are provided on the side surface of the brush 6 by pressing the rotating body (roller 10, round bar 23, sphere 33) with the elastic pressing pieces 9d, 22d, 32d. , The elastic pressing piece 9d, if the rotating body can be pressed against the side surface of the brush 6 with elasticity.
22d and 32d may be changed to other elastic pressing means.
For example, a torsion coil spring may be fixed to the brush holder as the elastic pressing means, and the rotating body may be pressed against the side surface of the brush 6 by the torsion coil spring. Even in this case, the same effect as the effect (1) of each of the above-described embodiments can be obtained.

In the above embodiments, the elastic pressing piece 9 is used.
Although d, 22d, and 32d are integrally formed with the holder members 9, 22, and 32 forming the brush holders 5, 21, and 31, the elastic pressing piece is provided separately from the brush holder (holder member) and fixed to the brush holder. May be. Even in this case, the effects (1), (2) of the first embodiment,
(4), (5), the effect of the second embodiment (1),
(2), (4), the effect (1) of the third embodiment,
The same effects as (2), (4) and (5) can be obtained.

In each of the above embodiments, a plurality of rotating bodies (roller 10, round bar 23, sphere 33) are provided in the front-back direction of the brush 6 (radial direction of the commutator 3), but the number of rotating bodies is changed to one. Alternatively, a plurality of other brushes may be provided in the front-back direction of the brush 6. For example, even if the number of rotating bodies (roller 10, round bar 23, sphere 33) is one, the effects (1) to (4) of the first embodiment and the effects of the second embodiment ( It is possible to obtain the same effects as the effects (1) to (3) and the effects (1) to (4) of the third embodiment. In addition, for example, the rotating body (roller 10, round bar 2
3. If the number of spheres 33) is set to another plural number, the same effect as that of each of the above-described embodiments can be obtained. In these cases, the rotating body (roller 10, round bar 23, sphere 3
3) for holding (support shaft 9e, U-shaped portion 22)
e, the shape of the holding portion 32e) needs to be changed appropriately.

In the first embodiment, the elastic pressing piece 9d is integrally formed with the support shaft 9e which can be inserted into the roller 10, and the support shaft 9e supports the roller 10, but the roller 10 is supported. The member for (holding) may be a member different from the elastic pressing piece. Even in this case, the same effects as the effects (1) to (3) and (5) of the first embodiment can be obtained.

In the third embodiment, the elastic pressing piece 32d is integrally formed with the holding portion 32e for restricting the movement of the spherical body 33 in a direction other than the direction of the other side surface of the brush 6, and the holding portion 32e and the brush. While holding the sphere 33 on the other side of 6,
The member for holding the sphere 33 may be a member different from the elastic pressing piece. Even in this case, the same effects as the effects (1) to (3) and (5) of the third embodiment can be obtained.

In each of the above-mentioned embodiments, the brush holders 5, 21, 31 are made up of the resin substrate 8 and the metal holder members 9, 22, 32 fixed on the substrate 8. The brush holder may be formed of other members as long as they have the same function. For example, the brush holder may be integrally formed on a resin substrate fixed to a motor case (not shown). Even in this case, the same effect as that of each of the above-described embodiments can be obtained.

In each of the above embodiments, the rotating body (roller 10, round bar 23, sphere 33) is formed of a metal material, but it may be implemented by changing to another material (for example, resin). Good. Even in this case, the same effect as that of each of the above-described embodiments can be obtained.

In each of the above embodiments, the DC motor 1 having a pair (two) of brush devices 4 is embodied, but a DC motor having another number (for example, three) of the brush devices 4 (for wiper, for example) Motor) and the like. Even in this case, the same effect as that of the above-described embodiment can be obtained.

The technical ideas that can be understood from the above-described embodiment will be described below along with their effects. (A) A motor comprising the brush device according to any one of claims 1 to 6. With this configuration, it is possible to provide a motor that can prevent the brush from rattling in the rotation direction of the commutator.

[0067]

As described in detail above, according to the present invention,
It is possible to provide a brush device that can prevent the brush from rattling in the rotation direction of the commutator.

[Brief description of drawings]

FIG. 1 is a schematic view of a brush device according to a first embodiment as viewed from a rotation axis direction.

FIG. 2 is a schematic view of the brush device according to the first embodiment as viewed from the side.

FIG. 3 is a schematic view of the brush device according to the second embodiment as seen from the direction of the rotation axis.

FIG. 4 is a schematic view of the brush device according to the second embodiment as viewed from the side.

FIG. 5 is a schematic view of the brush device according to the third embodiment as seen from the direction of the rotation axis.

FIG. 6 is a schematic view of the brush device according to the third embodiment as viewed from the side.

FIG. 7 is a schematic view of a conventional brush device as viewed from the direction of the rotation axis.

[Explanation of symbols]

3 ... Commutator, 5, 21, 31 ... Brush holder, 6
... brush, 10 ... roller (rotating body), 23 ... round bar (rotating body), 33 ... spherical body (rotating body), 9d, 22d, 32d
... elastic pressing piece, 9e ... support shaft, 32e ... holding part.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhide Ito             Asumo Corporation, 390 Umeda, Kosai City, Shizuoka Prefecture             In the company (72) Inventor Takeshi Tanaka             Asumo Corporation, 390 Umeda, Kosai City, Shizuoka Prefecture             In the company F-term (reference) 5H605 AA04 AA05 BB05 BB09 CC03                       CC07 EA25                 5H613 AA03 BB15 BB26 GA13 GA16                       GB09 PP03

Claims (6)

[Claims] 1. A brush (6) is housed and held in a brush holder (5, 21, 31) extending in a radial direction of the commutator (3), and a tip portion of the brush (6) is pressed against the commutator (3). In the contact brush device, the side surface of the brush (6) is elastically pressed and contacted,
A brush device comprising a rotating body (10, 23, 33) which is rotated by movement of the brush (6) in the front-rear direction. 2. The brush device according to claim 1, wherein the brush holder (5, 21, 31) is provided with elastic pressing pieces (9d, 22d, 32d) having elasticity, and the rotating body (10, 23, 31). 33) is a brush device characterized in that the elastic pressing piece (9d, 22d, 32d) 33 is elastically pressed against the side surface of the brush (6). 3. The brush device according to claim 2, wherein the elastic pressing piece (9d, 22d, 32d) is integrally formed with the brush holder (5, 21, 31). 4. The brush device according to claim 2, wherein the rotating body is a roller (10) having a substantially cylindrical shape, and the elastic pressing piece (9d) can be inserted into the roller (10). The shaft (9e) is integrally formed, and the support shaft (9e)
A brush device characterized in that the roller (10) is supported by e). 5. The brush device according to claim 2 or 3, wherein the rotating body is a spherical body (33), and the elastic pressing piece (32d) is provided with a lateral direction of the brush (6) of the spherical body (33). A brush device characterized in that a holding part (32e) for restricting movement in a direction other than the above is integrally formed, and the holding part (32e) and the side surface of the brush (6) hold the spherical body (33). 6. The brush device according to claim 1, wherein a plurality of the rotating bodies (10, 23, 33) are provided in a front-rear direction of the brush. .