JP2003088051A - Brush holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush holder which can suppress a foreign sound associated with the vibration of a brush. SOLUTION: A bottom plate 5 is provided with a regulating part 52 so as to regulate the inward shifting of each engaging piece 42 of a brush holder body 4. It prevents an interval between a left sidewall 4L and a right sidewall 4R from becoming short at the end of the commutator side of the brush holder body 4. As a result, even if the brush to slide on the commutator vibrates associated with the rotation of the commutotor, the brush is hard to collide against the left sidewall 4L or the right sidewall 4R. Accordingly, the brush holder can prevent the foreign sound associated with the vibration of the brush.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holding device provided in a DC motor, and more particularly to a brush holding device that holds a brush for mechanically rectifying a power supply to a winding. .

[0002]

2. Description of the Related Art A brush holding device for a DC motor is fixed to a motor housing, is fixed to a substrate made of an insulating resin material, and is fixed to the substrate.
The brush holder is made of a metal material such as brass and has an opening on the commutator side. The brush holder accommodates a brush and a spring that biases the brush toward the commutator. As a result, in the DC motor, the brush is brought into sliding contact with the commutator by the urging force of the spring to mechanically rectify the DC power from the outside and supply it to the winding.

[0003]

By the way, when the commutator is rotated, the brush collides with the step between the segments of the commutator. As a result, when the brush vibrates and collides with the brush holder, abnormal noise is generated.

Particularly, when the distance between both side walls located in the rotating direction of the commutator with respect to the brush at the end on the commutator side of the brush holder becomes short, the brush easily collides with the both side walls and an abnormal noise is generated. easy.

The present invention has been made in view of these problems, and an object thereof is to provide a brush holding device capable of suppressing abnormal noise caused by vibration of a brush. .

[0006]

In order to achieve the above object, in the invention described in claim 1, a brush holder having a square tubular shape with an opening on the commutator side, and a substrate to which the brush holder is fixed. And a brush holder formed from a brush holder main body that forms three walls including a first side wall and a second side wall that are located in the rotation direction of the commutator with respect to the brush, and a base member that forms the remaining wall, First
Fixing parts are provided on the side wall and the second side wall, respectively,
An accommodation portion formed in the brush holder by fixing a fixed portion to which the fixing portions are engaged with the substrate, and fixing the brush holder to the substrate by engaging and bending each fixing portion. In a brush holding device that holds a brush on a commutator and holds the brush on the commutator, the commutator-side end portions of the first side wall and the second side wall are respectively provided with engaging portions, and the engaging portions move to the other wall side. A regulation unit is provided to regulate the operation.

Therefore, according to the invention described in claim 1,
Positioned in the direction of rotation of the commutator with respect to the brush
The engaging portions provided on the commutator side end portions of the side wall and the second side wall are restricted from moving to the other wall side by the restricting portion provided on the base member. Therefore, it is possible to prevent the distance between the first side wall and the second side wall from being shortened at the commutator side end portion. As a result, even if the brush pressed by the commutator vibrates with the rotation of the commutator, it is difficult for the brush to collide with the first side wall or the second side wall. Particularly, since the brush is pressed by the commutator, the amplitude of vibration of the brush due to the rotation of the commutator is large on the commutator side. Therefore, the movement of the end of the commutator on the side of the commutator, where the brush is likely to collide with a large amplitude, is restricted to prevent the brush from colliding.

According to a second aspect of the invention, in the brush holding device according to the first aspect, the second side wall and the second side wall are respectively provided with second engaging portions at the end portions on the side opposite to the commutator, and the base member is provided with the second engaging portions. The engaged portions with which the second engaging portions are engaged are provided, and the distance between the locking surfaces of the engaged portions is set to the second
It is shorter than the distance between the outer surfaces of the engaging portions.

Therefore, according to the invention described in claim 2,
The second engaging portions provided on the anti-commutator side end portions of the first side wall and the second side wall are forcibly fitted to the engaged portions provided on the base member. Therefore, the distance between the first side wall and the second side wall becomes long at the end on the commutator side.
As a result, even if the brush vibrates along with the rotation of the commutator, it is more difficult to collide with the first side wall or the second side wall.

According to a third aspect of the present invention, in the brush holding device according to the first or second aspect, the distance between the regulation surfaces of the regulation portion is made longer than the distance between the inner surfaces of the engagement portions. . Therefore, according to the third aspect of the invention, when the brush holder is fixed to the substrate, the distance between the first side wall and the second side wall becomes long at the commutator side end portion. As a result, even if the brush vibrates as the commutator rotates,
It is difficult to collide with the first side wall or the second side wall.

According to a fourth aspect of the present invention, in the brush holding device according to any one of the first to third aspects, each fixing portion of the first side wall and the second side wall is fixed to each of the substrates to be fixed. The brush holder was fixed to the substrate by engaging the parts and bending them toward the other wall.

Therefore, according to the invention of claim 4,
With the fixing of the brush holder to the substrate, bending forces act on the first side wall and the second side wall on the other wall side. That is, the bending force acts in the direction in which the distance between the first side wall and the second side wall becomes shorter at the commutator side end portion. However, the engaging portions provided on the commutator-side end portions of the first side wall and the second side wall are restricted from moving toward the other wall by the restriction portion provided on the base member. Therefore, it is possible to prevent the distance between the first side wall and the second side wall from being shortened at the commutator side end portion. As a result, even if the brush vibrates with the rotation of the commutator, it is difficult for the brush to collide with the first side wall or the second side wall.

According to a fifth aspect of the present invention, in the brush holding device according to any one of the first to third aspects, each fixing portion of the first side wall and the second side wall is fixed to each of the substrates to be fixed. The brush holder was fixed to the substrate by engaging the parts and bending the parts opposite to each other.

Therefore, according to the invention of claim 5,
As the brush holder is fixed to the substrate, a bending force acts on the first side wall and the second side wall on the side opposite to the other side. That is, the bending force acts in the direction in which the distance between the first side wall and the second side wall becomes longer at the commutator side end portion. Therefore, it is possible to prevent the distance between the first side wall and the second side wall from being shortened at the commutator side end portion. As a result, even if the brush vibrates with the rotation of the commutator, it is difficult for the brush to collide with the first side wall or the second side wall.

According to a sixth aspect of the present invention, in the brush holding device according to any one of the first to fifth aspects, among the three walls constituting the brush holder body, the first side wall and the second side wall are provided. A guide groove for the pigtail for supplying power to the brush was formed on the wall extending over the entire length.

Therefore, according to the invention of claim 6,
The pigtail for supplying power to the brush is taken out of the brush holder from a guide groove formed in a wall provided over the first side wall and the second side wall of the three walls forming the brush holder body. In other words, the pigtail is not removed from the first side wall or the second side wall. Therefore, the pulling force or the compressing force of the pigtail does not act in the direction approaching the first side wall or the second side wall, but in the direction approaching the wall or the base member extending over the first side wall and the second side wall. As a result, even if the brush vibrates with the rotation of the commutator while the pulling force or the compressing force of the pigtail is applied, it is difficult for the brush to collide with the first side wall or the second side wall.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the brush holding device according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a brush holding device 1 for a DC motor comprises a substrate 2 and a brush holder 3.
The substrate 2 is made of an insulating resin material. The brush holder 3 is made of a metal material, such as brass, which has excellent heat resistance and has a small dimensional variation due to heat, and has a rectangular tubular shape, and includes a brush holder body 4 and a bottom plate 5.

The brush holder body 4 has a U-shaped cross section and includes an upper wall 4U, a left side wall 4L and a right side wall 4R. A guide groove 4a is formed in the upper wall 4U from the commutator 6 side toward the anti-commutator 6 side.

The bottom plate 5 is provided with a base portion 5D for closing the opening below the brush holder body 4 and a rising portion 5B for closing the opening of the brush holder body 4 on the side opposite to the commutator 6. As a result, as shown in FIG. 2, when the brush holder body 4 and the bottom plate 5 are in the engaged state, the housing portion S is formed in which only the commutator 6 side of the brush holder body 4 is opened.

The housing S contains a brush 7 and a spring (not shown) that biases the brush 7 toward the commutator 6. As a result, the brush 7 is brought into sliding contact with the commutator 6 by the urging force of the spring, and mechanically rectifies the DC power supplied from above the brush holder 3 via the pigtail 8 and supplies it to the winding. The pigtail 8 is taken out above the brush holder 3 from the rear portion of the brush 7, that is, the side opposite to the commutator 6 through the guide groove 4a.

Next, the configurations of the brush holder body 4 and the bottom plate 5 will be described in detail with reference to FIG. As shown in FIG. 3, the left side wall 4L and the right side wall 4 of the brush holder body 4 are
On the R, a pair of fixing pieces 41 is formed so as to extend downward from the central portion of the lower end. Each of these fixing pieces 41 is inserted into a pair of engaging recesses 51 formed in the bottom plate 5 and a pair of fitting holes 21 formed in the substrate 2, and is bent inward. As a result, the brush holder body 4 and the bottom plate 5 are integrally fixed to the substrate 2.

On the other hand, on the left side wall 4L and the right side wall 4R of the brush holder main body 4, a pair of engaging pieces 42 are formed at the ends on the commutator 6 side. Each of these engagement pieces 42
The abutting of the restricting portion 52 formed on the bottom plate 5 against the left end surface 52L and the right end surface 52R restricts the inward movement.

As described above in detail, according to this embodiment, the following actions and effects can be obtained. (1) The bottom plate 5 is provided with the restricting portion 52 to restrict the inward movement of each engaging piece 42 of the brush holder body 4. Therefore, at the end of the brush holder body 4 on the commutator 6 side, it is possible to prevent the distance between the left side wall 4L and the right side wall 4R from becoming short. As a result, even if the brush 7 slidingly contacting the commutator 6 vibrates as the commutator 6 rotates,
It is hard to collide with the left side wall 4L or the right side wall 4R. Therefore, it is possible to suppress the abnormal noise caused by the vibration of the brush 7.

(2) In particular, since the brush 7 is brought into sliding contact with the commutator 6, the amplitude of the vibration of the brush 7 accompanying the rotation of the commutator 6 is large on the commutator 6 side. Therefore, the movement of the end portion of the commutator 6 side where the brush 7 is likely to collide with a large amplitude to the other wall side is regulated to make the brush 7 less likely to collide. Therefore, it is possible to efficiently suppress the abnormal noise caused by the vibration of the brush 7.

(3) In addition, the pigtail 8 for supplying power to the brush 7 is provided at the rear portion of the brush 7, that is, from the side opposite to the commutator 6 via the guide groove 4a.
Is taken out above. Therefore, when the brush 7 vibrates with the connecting portion with the pigtail 8 as a fulcrum,
The amplitude of vibration on the commutator 6 side increases. Therefore,
The movement of the end of the commutator 6 on the side of the commutator 6 to which the brush 7 is likely to collide with a large amplitude is restricted to prevent the brush 7 from colliding. Therefore, it is possible to efficiently suppress the abnormal noise caused by the vibration of the brush 7.

(4) Each engaging piece 42 of the brush holder body 4
To the left end surface 52L and the right end surface 52 of the restricting portion 52 of the bottom plate 5.
By abutting on R, the inward movement is restricted. Therefore, if the brush 7 collides with the left side wall 4L or the right side wall 4R, the vibration energy of the brush holder main body 4 due to the collision causes the engagement piece 42 and the restricting portion 52.
Disappeared as frictional energy due to contact with. Therefore, even if the brush 7 collides with the left side wall 4L or the right side wall 4R, abnormal noise can be suppressed.

(5) The pigtail 8 is taken out of the brush holder 3 through the guide groove 4a formed in the upper wall 4U provided over the left side wall 4L and the right side wall 4R. In other words, the pigtail 8 is connected to the left side wall 4L or the right side wall 4R.
I haven't taken it out of. Therefore, the pulling force or the compressing force of the pigtail 8 does not act in the direction approaching the left side wall 4L or the right side wall 4R, but acts in the direction approaching the upper wall 4U or the bottom plate 5. As a result, when the pulling force or the compressing force of the pigtail 8 is applied, the brush 7 moves to the commutator 6
Left side wall 4L or right side wall 4R even if it vibrates with the rotation of
Hard to collide with. Therefore, it is possible to suppress abnormal noise accompanying the vibration of the brush 7 without depending on the rotation direction of the commutator 6.

(Second Embodiment) Next, a second embodiment of the present invention will be described. The second embodiment is mainly different from the first embodiment in that a pair of engagement pieces 43 are formed on the side of the brush holder body 4 opposite to the commutator 6.

That is, as shown in FIG. 4, in the left side wall 4L and the right side wall 4R of the brush holder body 4, a pair of engagement pieces 43 are formed at the end portions on the side opposite to the commutator 6. These engagement pieces 43 are engaged with a pair of engagement recesses 53 formed on the bottom plate 5, and the outward movement is restricted by the left engagement surface 53L and the right engagement surface 53R.

Specifically, the left locking surface 5 shown in FIG. 5 (a)
The distance L1 between 3L and the right locking surface 53R is shorter than the distance L2 between the outer surface of the left side wall 4L and the outer surface of the right side wall 4R in the brush holder body 4 shown in FIG. 5B. Therefore, each engagement piece 43 of the brush holder main body 4 is attached to the engagement recess 53 of the bottom plate 5.
When engaged with, the outer surface of each engagement piece 43 is locked to the left locking surface 53L and the right locking surface 53R.

As described in detail above, according to this embodiment, the following actions and effects can be obtained. (6) Distance L1 between left locking surface 53L and right locking surface 53R
Is shorter than the distance L2 between the outer surface of the left side wall 4L and the outer surface of the right side wall 4R in the brush holder body 4. Therefore, the outer surface of each engagement piece 43 of the brush holder body 4 is locked to the left locking surface 53L and the right locking surface 53R. In other words, the brush holder body 4 on the side opposite to the commutator 6 is placed on the bottom plate 5.
It is forced to fit. Therefore, at the end of the brush holder body 4 on the commutator 6 side, the left side wall 4L and the right side wall 4
The distance between R becomes long. As a result, even if the brush 7 vibrates with the rotation of the commutator 6, it is more difficult to collide with the left side wall 4L or the right side wall 4R. Therefore, it is possible to reliably suppress the abnormal noise caused by the vibration of the brush 7. In particular, when the brush 7 vibrates with the connecting portion with the pigtail 8 as a fulcrum, it is possible to efficiently suppress the abnormal noise accompanying the vibration of the brush 7.

(Third Embodiment) Next, a third embodiment of the present invention will be described. The third embodiment is mainly different from the first embodiment in that the shape of the restricting portion 52 of the bottom plate 5 is changed, and the shape of the brush holder body 4 is the same as that of the first embodiment. Is.

That is, the distance L3 between the left end surface 52L and the right end surface 52R of the regulating portion 52 of this embodiment shown in FIG.
It is longer than the distance L4 between the left end surface 52L and the right end surface 52R of the restriction portion 52 of the first embodiment shown in FIG. 6 (b). The distance L3 is longer than the distance L5 (= L4) between the inner surfaces of the engagement pieces 42 of the brush holder body 4 shown in FIG. 6C. Then, as shown in FIG. 7, when the brush holder main body 4 and the bottom plate 5 are fixed to the substrate 2, each engaging piece 42 is brought into contact with the left end surface 52L and the right end surface 52R of the restriction portion 52, so that Is restricted to travel.

As described above in detail, according to this embodiment, the following actions and effects can be obtained. (7) The distance L3 between the left end surface 52L and the right end surface 52R is made longer than the distance L5 between the inner surfaces of the engagement pieces 42. Therefore, when the brush holder body 4 and the bottom plate 5 are fixed to the substrate 2, the distance between the left side wall 4L and the right side wall 4R becomes equal to the upper wall 4U.
To the bottom plate 5, that is, from the pigtail 8 side to the anti-pigtail 8 side, the length becomes longer. In other words, when the brush 7 vibrates about the connection portion with the pigtail 8 as a fulcrum, the distance between the lower end portions on the commutator 6 side where the brush 7 is likely to collide with a large amplitude is secured long. As a result, even when the brush 7 vibrates with the connection portion with the pigtail 8 as a fulcrum, the left side wall 4
It is hard to collide with L or the right side wall 4R. Therefore, it is possible to suppress the abnormal noise caused by the vibration of the brush 7.

The above-mentioned respective embodiments can be modified and embodied as follows. As shown in FIG. 8, each fixing piece 4 of the brush holder body 4
The brush holder 3 may be fixed to the substrate 2 by bending 1 outward. It is preferable that the bottom plate 5 is provided with the restriction portion 52. With this configuration, the substrate 2
With the fixing of the brush holder 3 to the left wall 4L, a bending force acts on the left wall 4L and the right wall 4R on the side opposite to the other wall. That is, at the end of the commutator 6 side, the bending force acts in the direction in which the distance between the left side wall 4L and the right side wall 4R becomes longer. Therefore, it is possible to prevent the distance between the left side wall 4L and the right side wall 4R from becoming short at the end of the commutator 6 side. As a result, even if the brush 7 vibrates with the rotation of the commutator 6, it is difficult for the brush 7 to collide with the left side wall 4L or the right side wall 4R. Therefore, it is possible to suppress the abnormal noise caused by the vibration of the brush 7.

[0037]

Since the present invention is constructed as described above, it has the following effects. According to the invention described in any one of claims 1 to 6, it is possible to suppress the abnormal noise caused by the vibration of the brush.

[Brief description of drawings]

FIG. 1 is a perspective view of a brush holding device according to a first embodiment.

FIG. 2 is a cross-sectional view of the brush holding device according to the first embodiment.

FIG. 3 is an exploded perspective view of the brush holding device according to the first embodiment.

FIG. 4 is an exploded perspective view of a brush holding device according to a second embodiment.

5A is a plan view of a bottom plate, and FIG. 5B is a front view of a brush holder main body.

FIG. 6A is a plan view of a bottom plate of a third embodiment, and FIG.
Is a plan view of the bottom plate of the first embodiment, and (c) is a front view of the brush holder body.

FIG. 7 is a sectional view of a brush holding device according to a third embodiment.

FIG. 8 is a cross-sectional view of a brush holding device according to another embodiment.

[Explanation of symbols]

1 ... Brush holding device, 2 ... Substrate, 3 ... Brush holder, 4
... Brush holder body, 4a ... Guide groove, 4L ... Left side wall as first side wall, 4R ... Right side wall as second side wall, 4U ...
Top wall, 5 ... bottom plate as base member, 6 ... commutator, 7 ... brush, 8 ... pigtail, 21 ... fitting hole as fixed part, 41 ... fixing piece as fixing part, 42 ... as engaging part Engagement piece 43: Engagement piece as second engagement part, 52 ... Restriction part, 52L ... Left end surface as restriction surface, 5
2R ... right end surface as a restricting surface, 53 ... engaging concave portion as an engaged portion, 53L ... left locking surface as a locking surface, 53R ...
Right locking surface as a locking surface, L1 ... Distance, L2 ... Distance, L
3 ... distance, L5 ... distance, S ... container.

Claims (6)

[Claims] 1. A brush holder in the form of a square tube having an opening on the commutator side, and a substrate to which the brush holder is fixed, the brush holder comprising: It is formed from a brush holder main body forming three walls including a second side wall and a base member forming the remaining wall, and fixing portions are provided on the first side wall and the second side wall, respectively. A fixed part to be engaged is provided, and each fixing part is engaged with each fixed part and bent to fix the brush holder to the substrate, and the brush is held in the accommodating part formed in the brush holder to hold the commutator. In a brush holding device that presses against each other, engaging portions are provided on commutator side end portions of the first side wall and the second side wall, respectively, and the engaging portions move to the other wall side on the base member. Brush holding device provided with a regulating portion for restraining the that. 2. The brush holding device according to claim 1, wherein the first side wall and the second side wall are respectively provided with second engaging portions at the end portions on the side opposite to the commutator, and the base member is provided with the second engaging portions. A brush holding device in which an engaged portion with which the engaging portion is engaged is provided, and a distance between locking surfaces of the engaged portions is shorter than a distance between outer surfaces of the second engaging portions. 3. The brush holding device according to claim 1 or 2, wherein the distance between the restriction surfaces of the restriction portion is longer than the distance between the inner surfaces of the engagement portions. 4. The brush holding device according to claim 1, wherein the fixed portions of the first side wall and the second side wall are engaged with the fixed portions of the substrate to be fixed to each other. A brush holding device that fixes the brush holder to the substrate by bending it to the other wall side. 5. The brush holding device according to claim 1, wherein the fixing portions of the first side wall and the second side wall are engaged with the respective fixed portions of the substrate, and are fixed to each other. A brush holding device that fixes the brush holder to the substrate by bending it to the side opposite to the other wall side. 6. The brush holding device according to any one of claims 1 to 5, wherein among the three walls forming the brush holder main body, the wall provided over the first side wall and the second side wall. A brush holding device having a pigtail guide groove for supplying power to the brush.