JP2003061315A - Brush device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush device capable of restraining a brush from rattling against a brush holder in a rotational direction of a commutator. SOLUTION: The brush device 4 is accommodated and held so that the brush 6 may have a clearance in the brush holder 5 extending in the diametrical direction of the commutator 3, and a front end part of the brush 6 is brought into pressure contact with the commutator 3. The brush 6 is energized to the commutator 3 side by an energizing force of a coil spring 7, and energized downward by a component force of the coil spring 7 by a rear end inclined surface 6b formed at the brush 6. A V-shaped groove 6a is cut in a lower surface of the brush 6 so as to extend in the diametrical direction of the commutator 3. A round bar 9 is fixed at a lower part 5e of the brush holder 5 so as to extend in the diametrical direction of the commutator 3 and be engaged with the rotational direction of the V-shaped groove 6a and the commutator 3.

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 which can prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator. To do.

[0008]

According to a first aspect of the present invention, a brush holder is accommodated and held in a brush holder extending in the radial direction of the commutator with a gap, and the tip of the brush is pressed against the commutator. In the contacted brush device, the brush is biased in one axial direction of the commutator, and the brush and the brush holder in the one axial direction of the commutator face each other. Rotational direction restraining means for restraining the relative movement of the commutator in the rotational direction of the brush holder relative to the radial movement of the commutator is provided.

According to a second aspect of the present invention, in the brush device according to the first aspect, the rotation direction suppressing means has a V-shaped groove provided in the brush so as to extend in the radial direction of the commutator, The brush holder is provided with an engaging convex portion projecting from the brush holder so as to extend in the radial direction of the commutator and engage with the V-shaped groove in the rotating direction of the commutator.

According to a third aspect of the present invention, in the brush device according to the second aspect, the engaging convex portion is a curved portion convex toward the V-shaped groove. According to a fourth aspect of the present invention, in the brush device according to the second or third aspect, a plurality of the V-shaped grooves and the engaging convex portions are arranged in parallel in the rotation direction of the commutator.

According to a fifth aspect of the present invention, in the brush device according to the first aspect, a plurality of the rotation direction suppressing means are formed in the rotation direction of the commutator in the brush holder, and the brush has a diameter of the commutator. It is a suppressing surface that abuts in a long direction.

According to a sixth aspect of the present invention, in the brush device according to the fifth aspect, the suppressing surface is a top surface of a convex portion provided in a convex shape on the brush holder. According to a seventh aspect of the present invention, in the brush device according to the fifth aspect, the suppressing surface is a non-concave surface formed by forming a concave portion in the brush holder.

The invention according to claim 8 is the invention according to claims 5 to 7.
In the brush device according to the item (1), the suppression surface is formed so as to be in line contact with the brush. According to a ninth aspect of the present invention, in the brush device according to any one of the first to eighth aspects, the rear end portion of the brush is moved toward the commutator side toward the other axial direction of the commutator. An end inclined surface is formed, and biasing means for contacting the rear end inclined surface and for biasing the commutator side is provided behind the brush.

(Operation) According to the invention described in claim 1,
The brush is biased in one axial direction of the commutator. Then, on the opposing surfaces of the brush and the brush holder in the one axial direction of the commutator, compared to the radial relative movement of the brush commutator with respect to the brush holder, relative movement of the brush commutator with respect to the brush holder in the rotational direction is performed. A rotation direction suppressing means is provided. Therefore, the brush easily moves in the radial direction of the commutator with respect to the brush holder, and it becomes difficult to move in the rotational direction of the commutator. Accordingly, it is possible to prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator without suppressing the movement of the brush toward the commutator side.

According to the second aspect of the invention, the brush is provided with a V-shaped groove so as to extend in the radial direction of the commutator. Further, the brush holder is provided with an engaging projection so as to extend in the radial direction of the commutator and engage with the V-shaped groove in the rotation direction of the commutator. Therefore, the brush is movable in the radial direction of the commutator so that its V-shaped groove is guided by the engaging convex portion, and the V-shaped groove of itself is engaged with the engaging convex portion in the rotational direction of the commutator. Then, it is immovable in that direction. Accordingly, it is possible to prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator without suppressing the movement of the brush toward the commutator side. Moreover, even if the brush becomes hot and expands with respect to the brush holder, and the size ratio of the V-shaped groove and the engaging convex portion changes, the action of the tapered surface of the V-shaped groove causes the brush to move in the axial direction of the commutator. It only moves, and does not hinder the radial movement of the brush commutator.

According to the third aspect of the present invention, since the engaging convex portion is a curved portion that is convex toward the V-shaped groove side, the curved portion and the V-shaped groove are two radially extending portions. Line contact occurs, and it becomes more difficult to further suppress movement of the brush toward the commutator side.

According to the fourth aspect of the invention, since the plurality of V-shaped grooves and the engaging protrusions are arranged in parallel in the rotating direction of the commutator, the brush rattles in the rotating direction of the commutator with respect to the brush holder. This can be further suppressed.

According to the fifth aspect of the present invention, the brush holder is provided with a plurality of restraining surfaces in the rotating direction of the commutator in which the brush abuts in the radial direction of the commutator.
Therefore, when the brush moves in the radial direction of the commutator,
The resistance is small, and when the commutator moves in the rotation direction, the resistance increases. Accordingly, it is possible to prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator without suppressing the movement of the brush toward the commutator side.

According to the sixth aspect of the invention, since the suppressing surface is the top surface of the convex portion provided on the brush holder, the movement of the brush toward the commutator side is not suppressed with a simple structure. In addition, it is possible to prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator.

According to the invention described in claim 7, since the suppressing surface is a non-concave surface formed by forming a concave portion in the brush holder, the suppressing surface is provided to the brush commutator side with a simple structure. It is possible to prevent the brush from rattling with respect to the brush holder in the rotational direction of the commutator without suppressing the movement of the brush.

According to the invention described in claim 8, since the suppressing surface is formed so as to be in line contact with the brush,
When the brush moves in the radial direction of the commutator, its resistance becomes extremely small.

According to the ninth aspect of the present invention, the rear end portion of the brush is formed with a rear end inclined surface that is closer to the commutator side toward the other axial direction of the commutator. Is provided with an urging means that abuts the rear end inclined surface to urge the commutator side. Therefore, the brush is urged toward the commutator side by the urging force of the urging means, and is urged in one axial direction of the commutator by the component force of the urging means by the rear end inclined surface.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment in which the present invention is embodied in a DC motor will be described below with reference to FIGS.

As shown in FIG. 1, the 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
A brush 6 and a coil spring 7 as a biasing means.
It has and.

The brush holder 5 is made of a resin material and is integrally formed on a substrate 8 fixed to a motor case (not shown). The brush holder 5 has a commutator 3 for accommodating and holding the brush 6 and the coil spring 7 therein.
Is formed so as to extend in the radial direction. Specifically, the brush holder 5 extends in the radial direction of the commutator 3, and a pair of rotation-direction-side side walls 5 are arranged in parallel on the rotation-direction side of the commutator 3.
2a, 5b, a rear end wall 5c formed so as to connect the rear end sides of the pair of rotation direction side side walls 5a, 5b (radially outer side of the commutator 3), as shown in FIGS. In addition, it is composed of an upper part 5d and a lower part 5e (which are part of the substrate 8) formed so as to cover the upper end and the lower end of the pair of rotation direction side walls 5a and 5b. The bottom of the brush holder 5,
That is, the round bar 9 as an engaging convex portion and a curved portion is fixed to the upper surface of the lower portion 5e. The round bar 9 is arranged on the upper surface of the lower portion 5e at the center of the commutator 3 in the rotation direction so as to extend in the radial direction of the commutator 3. or,
As shown in FIGS. 2A and 2B, a slit 5f extending in the radial direction of the commutator 3 is formed in the upper portion 5d.

The brush 6 is formed in a substantially quadrangular prism shape. The lower surface of the brush 6 facing the lower portion 5e (round bar 9) has a V-shape when viewed in the radial direction of the commutator 3 (see FIG. 2).
(See (a)), a V-shaped groove 6a extending in the radial direction of the commutator 3 is provided as a recess. The width of the brush 6 in the rotation direction of the commutator 3 is set to be smaller than the distance between the pair of rotation direction side walls 5a and 5b in the same direction.
Further, in the present embodiment, the round bar 9 and the V-shaped groove 6a
Constitutes a rotation direction suppressing means.

Further, above the rear end of the brush 6 (the outer end in the radial direction of the commutator 3) (upper side in FIG. 2B),
A rear end inclined surface 6b is formed so as to extend upward (upward in FIG. 2B) toward the commutator 3 side. In addition, on the rear end side of the brush 6 excluding the rear end inclined surface 6b, the upper surface (see FIG.
(A) and (b), one end of the pigtail 10 is embedded so as to project from the upper surface. The other end of the pigtail 10 is connected to a control device (power supply device) (not shown) outside the DC motor 1.

In the brush holder 5, the coil spring 7 is housed so as to be supported by the rear end wall 5c, and the rear end inclined surface 6b of the brush 6 is housed so as to contact the coil spring 7. Retained. At this time, as shown in FIG. 2A, the round bar 9 is arranged so that a part thereof enters the inside of the V-shaped groove 6 a of the brush 6.

The dimensions of each member are set so that the coil spring 7 is compressed in the radial direction of the commutator 3 when the brush 6 and the coil spring 7 are assembled. Therefore, the brush 6 is urged toward the commutator 3 side by the urging force of the coil spring 7 and downward by the component force of the coil spring 7 due to the rear end inclined surface 6b (in FIGS. 2A and 2B, Downward).

Therefore, the tip of the brush 6 is pressed into contact with the commutator 3. Also, the brush 6 has its own V
The groove 6a is guided by the round bar 9 so as to be movable in the radial direction of the commutator 3, and its own V-shaped groove 6a engages in the rotational direction of the round bar 9 and the commutator 3 so that it cannot move in that direction. To be done. It should be noted that the brush 6 is, as shown in FIG.
With the groove 6a in contact with the round bar 9, the shape of the V-shaped groove 6a (depth and inclination angle) should be set so that the two lowermost surfaces divided by the V-shaped groove 6a do not contact the lower portion 5e at the same time. ) Is set.

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

Even when the brush 6 is heated to a high temperature such as when the rotor rotates for a long time and expands with respect to the brush holder 5, and the size ratio of the V-shaped groove 6a and the round bar 9 changes, the V-shaped groove is changed. 6a
Due to the action of the tapered surface, the brush 6 only moves in the vertical direction (the axial direction of the commutator 3), and the movement of the brush 6 in the radial direction of the commutator 3 is not hindered.

Next, the characteristic effects of the above embodiment will be described below. (1) The brush 6 has its V-shaped groove 6a guided by the round bar 9 to be movable in the radial direction of the commutator 3, and has its own V-shaped groove 6a in the rotational direction of the round bar 9 and the commutator 3. It engages and is immovable in that direction. Thereby, the movement of the brush 6 toward the commutator 3 side is not suppressed, and the brush 6 is suppressed from rattling with respect to the brush holder 5 in the rotation direction of the commutator 3. As a result, the contact area between the tip of the brush 6 and the commutator 3 is always maintained even when the commutator 3 starts to rotate (during start-up) or while the commutator 3 is rotating, for example. The supply of drive current to the winding wound around the armature core is maintained. Therefore, in this DC motor 1, it is possible to obtain a desired rotation characteristic even when the DC motor 1 is started. Further, the generation of noise due to the vibration of the brush 6 is reduced.

(2) Since the round bar 9 having a convex curved portion on the V-shaped groove 6a side is used as the engaging convex portion for engaging the V-shaped groove 6a and the commutator 3 in the rotation direction, the round bar 9 is formed. And the brush 6 make two line contacts extending in the radial direction of the commutator 3 (as shown in FIG. 2A, they make two-point contact when viewed from the radial direction of the commutator 3). Therefore, the resistance when the brush 6 moves to the commutator 3 side becomes small, and it becomes more difficult to further suppress the movement in that direction.

(3) Rear end of brush 6 (commutator 3
2 (a) and (b) in the radial outer end portion of
A rear end inclined surface 6b is formed toward the commutator 3 side toward the upper side), and a coil spring 7 that abuts the rear end inclined surface 6b and urges the commutator 3 side is provided behind the brush 6. . Therefore, the brush 6 is biased toward the commutator 3 by the biasing force of the coil spring 7, and the coil spring 7 is formed by the rear end inclined surface 6b.
It is urged downward (downward in FIGS. 2A and 2B) by the component force of. With this configuration, the coil spring 7 also serves as the biasing means in the two directions, so that the number of parts of the brush device 4 can be reduced.

The above embodiment may be modified as follows. -In the above-mentioned embodiment, round bar 9 (engagement convex portion and curved portion)
Also, the brush device 4 is provided with one V-shaped groove 6a and one V-shaped groove 6a, but a plurality of round bars (engaging convex portions and curved portions) and V-shaped grooves may be arranged side by side in the rotation direction of the commutator 3. Good. For example, it may be changed as shown in FIG. In this brush device 21, the brush holder 2
Two round bars 23 are arranged in parallel in the rotating direction of the commutator 3. Further, the brush 24 has two round bars 2
Two V-shaped grooves 24a are formed corresponding to the number 3. Even in this case, the same effect as that of the above-described embodiment can be obtained. The round bar 23 and the V-shaped groove 24a are
Since the plurality of brushes 24 are arranged in parallel in the rotation direction of the commutator 3, it is possible to further prevent the brush 24 from rattling with respect to the brush holder 22 in the rotation direction of the commutator 3.

In the above embodiment, the round bar 9 is fixed to the lower part 5e of the brush holder 5, but the V-shaped groove 6a of the brush 6 is used.
If engaging with the commutator 3 in the rotation direction, it may be changed to another engaging convex portion. For example, the lower part 5 of the brush holder 5
A semi-circular convex portion as a curved portion that is convex on the V-shaped groove 6a side may be integrally formed and provided in e. Even in this case, the same effect as that of the above-described embodiment can be obtained.
Also, for example, in the lower portion 5e of the brush holder 5, a V-shaped groove 6a
You may implement by forming the engaging convex part which does not become a convex curved part on the side (for example, convex part of a triangular cross section etc.). Even in this case, the same effects as the effects (1) and (3) of the above embodiment can be obtained.

In the above embodiment, the brush holder 5 is provided with the round bar 9 and the brush 6 is provided with the V-shaped groove 6a.
Although the brush 6 can be moved in the radial direction of the commutator 3 and cannot be moved in the rotation direction of the commutator 3, the brush commutator 3 with respect to the brush holder can be compared with the relative movement of the brush commutator 3 with respect to the brush holder in the radial direction. The round bar 9 and the V-shaped groove 6a may be changed to another rotation direction suppressing means as long as the relative movement of the rotation direction can be suppressed.

For example, a plurality of suppressing surfaces are formed in the brush holder in the rotational direction of the commutator 3 so that the brush is long in contact with the commutator 3 in the radial direction. That is, FIG. 4 (a) (b)
The brush holder 31 is changed as shown in FIG. On the upper surface of the lower portion 31a of the brush holder 31, the convex portion 3 having a triangular cross section when viewed from the radial direction of the commutator 3 (see FIG. 4A).
A plurality of (1) 1b are provided in a protruding manner. This convex portion 31b
Are formed to be long in the radial direction, as shown in FIG. Unlike the brush 6, the brush 32 does not have the V-shaped groove 6a. Also, in this example, the convex portion 31b
The top surface 31c of the above constitutes a suppression surface. In the brush device configured as described above, when the brush 32 moves in the radial direction of the commutator 3, its resistance is small, and when it moves in the rotation direction of the commutator 3, its resistance increases.
This can prevent the brush 32 from rattling in the rotational direction of the commutator 3 with respect to the brush holder 31 without suppressing the movement of the brush 32 toward the commutator 3 side. Further, since the suppression surface is the top surface 31c of the convex portion 31b provided on the brush holder 31, the above effect can be obtained with a simple configuration. Moreover, since the convex portion 31b has a triangular cross section when viewed from the radial direction of the commutator 3 (see FIG. 4A), the convex portion 31b and the brush 32 make line contact extending in the radial direction of the commutator 3. Therefore, when the brush 32 moves in the radial direction of the commutator 3, its resistance becomes extremely small.

Further, the brush holder 41 may be changed to that shown in FIGS. On the upper surface of the lower portion 41a of the brush holder 41, a plurality of (3) V-shaped concave portions 41b when viewed from the radial direction of the commutator 3 (see FIG. 4A) are formed.
Tsu) It is recessed. The recess 41b is formed to be long in the radial direction, as shown in FIG. The three recesses 41b are seen from the radial direction of the commutator 3 (see FIG.
(See (a)) Rotation direction of commutator 3 (Fig. 4 (a))
It is formed continuously in the middle and left and right directions. Unlike the brush 6, the brush 42 does not have the V-shaped groove 6a. Further, in this example, the recess 41b is formed by being recessed, in other words, the non-recessed surface 41c which is a high position portion formed between the adjacent recesses 41b constitutes the suppressing surface. With the brush device configured in this way,
When the brush 42 moves in the radial direction of the commutator 3, its resistance is small, and when it moves in the rotation direction of the commutator 3, its resistance becomes large. As a result, the brush 42
Of the brush 42 without suppressing the movement of the brush 42 toward the commutator 3 side.
Can be prevented from rattling with respect to the brush holder 41 in the rotation direction of the commutator 3. Further, since the suppression surface is the non-recessed surface 41c formed by recessing the recess 41b in the brush holder 31, it has a simple structure.
The above effect can be obtained. Moreover, the recess 41b is
As viewed from the radial direction of the commutator 3 (see FIG. 4A), the non-concave surface 41c and the brush 42 are formed continuously in the rotation direction of the commutator 3 (the left-right direction in FIG. 4A).
And are line contacts extending in the radial direction of the commutator 3. Therefore, when the brush 42 moves in the radial direction of the commutator 3, its resistance becomes extremely small. In the above another example, the suppression surface (top surface 31c or non-concave surface 41c) is the brush 32, 4
Although the line contact with the commutator 3 is made to be in line contact with it, if the line contact is made longer than the line contact, and the relative movement in the rotational direction of the commutator 3 can be suppressed as compared with the relative movement in the radial direction of the commutator 3. , It may be changed to another suppression surface.

In the above-described embodiment, the rear end inclined surface 6b is formed at the rear end of the brush 6, and the coil spring 7 abutting the rear end inclined surface 6b is provided behind the brush 6, whereby the brush 6 is urged toward the commutator 3 side by the urging force of the coil spring 7, and downward by the component force of the coil spring 7 due to the rear end inclined surface 6b (see FIG. 2A).
Although it is assumed that the brush 6 is urged downward in (b), it may be changed to another configuration as long as the brush 6 can be urged in the two directions. For example, a first urging unit that urges the brush 6 toward the commutator 3 and the brush 6 downward (see FIG. 2A).
(B) The second urging means for urging the inside may be provided separately. Even in this case, the same effects as the effects (1) and (2) of the above embodiment can be obtained.

In the above embodiment, the brush holder 5
Was integrally formed on a substrate 8 made of a resin material and fixed to a motor case (not shown). However, as long as it has an engaging protrusion having the same function as the round bar 9, two or more members can be formed. You may comprise a brush holder. For example, a resin substrate, a metal holder member having a substantially U-shaped cross section fixed to the substrate, and a round bar 9 may be used. Even in this case, the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the coil spring 7 is used as the urging means, but other urging means (for example,
A torsion spring, etc.) may be used instead. Even in this case, the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the DC motor 1 having a pair (two) of the brush devices 4 is embodied, but a DC motor having another number (for example, three) of the brush devices 4 (for example, a wiper motor). Etc.). 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) The brush device according to claim 9, wherein the urging means is a coil spring. With this configuration, the brush is biased toward the commutator side by the biasing force of the coil spring, and is biased in the width reduction direction by the inclined surface by the component force of the coil spring by the rear end inclined surface.

(B) A motor comprising the brush device according to any one of claims 1 to 9 and (a). With this configuration, it is possible to provide a motor that can prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator.

[0047]

As described in detail above, according to the present invention,
A brush device that can prevent the brush from rattling with respect to the brush holder in the rotation direction of the commutator can be provided.

[Brief description of drawings]

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

FIG. 2A is a schematic view of the brush device according to the present embodiment as viewed from the commutator side. (B) The schematic diagram which looked at the same brush apparatus from the side.

FIG. 3 is a schematic view of another example brush device as viewed from the commutator side.

FIG. 4A is a schematic view of another example of the brush device as viewed from the commutator side. (B) The schematic diagram which looked at the same brush apparatus from the side.

FIG. 5A is a schematic view of another example brush device as viewed from the commutator side. (B) The schematic diagram which looked at the same brush apparatus from the side.

FIG. 6 is a schematic view of a conventional brush device as viewed from a rotation axis direction.

[Explanation of symbols]

3 ... Commutator, 5, 22, 31, 41 ... Brush holder, 6, 24, 32, 42 ... Brush, 7 ... Coil spring (biasing means), 9, 23 ... Circle forming a part of rotation direction suppressing means Rod (engagement convex portion and curved portion), 6a, 24a
... V-shaped groove forming part of the rotation direction suppressing means, 6b ... Rear end inclined surface, 31b ... Convex portion, 31c ... Top surface (rotation direction suppressing means and suppressing surface), 41b ... Surface (rotation direction suppressing means and suppressing surface).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiya Yokoyama             Asumo Corporation, 390 Umeda, Kosai City, Shizuoka Prefecture             In the company (72) Inventor Moriya Kazuma             Asumo Corporation, 390 Umeda, Kosai City, Shizuoka Prefecture             In the company F term (reference) 5H613 AA02 AA03 BB04 BB15 BB19                       BB27 GA04 GA10 GA11 GA15                       KK05

Claims (9)

[Claims] 1. A brush (6, 6) in a brush holder (5, 22, 31, 41) extending in the radial direction of the commutator (3).
24, 32, 42) are accommodated and held with a gap, and the tip of the brush (6, 24, 32, 42) is pressed into contact with the commutator (3). , 24, 32, 42) in one axial direction of the commutator (3), and the brush (6, 24, 32, 42) and the brush holder (in the one axial direction of the commutator (3)). 5,22,31,41) on the surface facing the brush holder (5,22,31,41) in the radial direction of the commutator (3) of the brush (6,24,32,42). Compared with the brush holder (5, 2
The same brush (6,24,32,2,31,41)
42) rotation direction restraining means (9, 6a, 23, 24a,) for restraining relative movement of the commutator (3) in the rotation direction.
31c, 41c) is provided. 2. The brush device according to claim 1, wherein the rotation direction suppressing means is a V-shaped groove () formed in the brush (6, 24) so as to extend in a radial direction of the commutator (3). 6a, 24a)
And the V-shaped grooves (6a, 24a) and the commutator (3) so as to extend in the radial direction of the commutator (3).
Of the brush holder (5,
The brush device is characterized in that it comprises an engaging convex portion (9, 23) convexly provided on 22). 3. The brush device according to claim 2, wherein the engaging protrusions (9, 23) are formed in the V-shaped grooves (6a, 24).
A brush device having a convex curved portion on the side a). 4. The brush device according to claim 2, wherein a plurality of the V-shaped grooves (24a) and the engaging protrusions (23) are arranged in parallel in the rotation direction of the commutator (3). Brush device characterized by. 5. The brush device according to claim 1, wherein a plurality of the rotation direction suppressing means are formed in a rotation direction of the commutator (3) in the brush holder (31, 41), and the brush (3
2, 42) are restraining surfaces (31c, 41c) which are in contact with the commutator (3) for a long time in the radial direction. 6. The brush device according to claim 5, wherein the suppressing surface is a top surface (31c) of a convex portion (31b) protruding from the brush holder (31). . 7. The brush device according to claim 5, wherein the suppressing surface is a recess (41) in the brush holder (41).
A brush device, which is a non-recessed surface (41c) formed by recessing b). 8. The brush device according to claim 5, wherein the suppressing surface (31c, 41c) is provided on the brush (32,
42) is formed so as to be in line contact with the brush device. 9. The brush device according to claim 1, wherein a rear end portion of the brush (6, 24, 32, 42) is provided in the other axial direction of the commutator (3). A rear end inclined surface (6b) is formed toward the commutator (3) side as it goes toward the commutator (3) side, and is abutted against the rear end inclined surface (6b) behind the brush (6) and biased toward the commutator (3) side. A brush device comprising a biasing means (7) for operating.