JP2003174756A - Brush unit and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush unit which can be manufactured by a fewer assembling man-days and at a lower cost, by reducing the number of required parts. <P>SOLUTION: A locking recession 16 is formed integrally in a housing hole 14 a little closer to an outside opening 15 of a holder 13. In the anti-feeding brush 18 side end of an urging spring 19, a locking part 21 which is locked in a radial direction by the locking recession 16 at a predetermined rotation position with respect to the holder 13, is formed integrally. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush device used for a motor.

[0002]

2. Description of the Related Art For example, a brush device used in a motor is disclosed in Japanese Patent Laid-Open No. 2001-157412. In the brush device of this publication, a box provided on a brush holding base is provided with a power supply brush and a spring for urging the brush radially inward.
A radially outer opening of a box in which the power feeding brush and the spring are installed is closed by a closing member so that the spring which is compressed and deformed does not protrude to the outside.

[0003]

However, since the closing member is used, the number of parts is increased, the number of assembling steps is increased, and the cost is increased. Moreover, as in the above publication, a brush device having a large number of brushes also requires many closing members, and this problem cannot be ignored.

The present invention has been made to solve the above problems, and an object thereof is to reduce the number of parts to reduce the number of assembling steps and to reduce the cost. To provide.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 presses the substantially rectangular parallelepiped power feeding brush and the rear end surface of the power feeding brush to urge them radially inward. A substantially spiral urging spring, an insulating base provided with a plurality of holders for accommodating the power feeding brush and the urging spring in an accommodating hole that penetrates in a substantially rectangular cross section in the radial direction,
And a holder-side engaging portion is integrally formed in the accommodation hole near the outer opening of the holder,
A spring-side engagement portion that is radially engaged with the holder-side engagement portion at a predetermined rotational position with respect to the holder is integrally formed at an end portion of the biasing spring on the side opposite to the power feeding brush.

According to a second aspect of the present invention, in the brush device according to the first aspect, the holder-side engaging portion is an engaging concave portion formed inside the accommodation hole, and the spring-side engaging portion. The joint portion is a protrusion portion that protrudes outward in the radial direction of the biasing spring.

According to a third aspect of the present invention, in the brush device according to the second aspect, the holder is integrally formed with the insulating base made of resin, and the engaging recess is At least one of the upper portion and the bottom portion of the holder is formed in the accommodation hole at a site where it is open.

According to a fourth aspect of the present invention, in the brush device according to any one of the first to third aspects, the holder-side engaging portion and the spring-side engaging portion are at substantially 180 ° symmetrical positions. Are engaged at least at two points.

According to a fifth aspect of the present invention, in the brush device according to any one of the first to fourth aspects, at least one of the holder and the urging spring has the spring-side engaging portion. A detent means for deterring the spring is integrally formed with the holder-side engaging portion in a state of being arranged at the predetermined rotation position for radial engagement.

According to a sixth aspect of the present invention, in the brush device according to the fifth aspect, the detent means is inserted into the engagement hole formed in the holder and extending in the radial direction, and the engagement hole. It is composed of the end of the biasing spring.

A seventh aspect of the present invention is a motor including the brush device according to any one of the first to sixth aspects. (Operation) According to the invention described in claim 1, the holder side engagement portion is integrally formed in the accommodation hole near the outer opening of the holder, and the end portion of the biasing spring on the side opposite to the power feeding brush is formed. A spring-side engagement portion that is radially engaged with the holder-side engagement portion at a predetermined rotation position with respect to the holder is integrally formed. Such an urging spring is inserted from the outer opening of the holder in a position different from the rotational position, and when the spring side engaging portion is inserted to the position where the holder side engaging portion is provided, Rotate the spring to the desired rotation position. Then, both engaging portions are brought into an engaged state, and the biasing spring is immovably assembled further outward in the radial direction. Therefore, it is not necessary to use a special part to prevent the bias spring from popping out in the radial direction, so the number of parts can be reduced, and the number of parts can be reduced to reduce the number of assembly steps. However, the cost can be reduced.

According to the second aspect of the present invention, the holder-side engaging portion is an engaging concave portion formed inside the accommodation hole, and the spring-side engaging portion is radially outward of the biasing spring. It is a protruding portion that protrudes to. Therefore, both engaging portions can be easily formed.

According to the third aspect of the invention, the holder is formed integrally with the insulating base made of resin, and at least one of the upper portion and the bottom portion of the holder is opened as the engaging recess. It is formed in the accommodation hole of the open part. Therefore, when the insulating base on which the holder is integrally formed is molded by a mold that is separated in the vertical direction, the engaging recess can be easily formed from the top or bottom of the opened holder by the mold.

According to the fourth aspect of the present invention, the holder-side engaging portion and the spring-side engaging portion are engaged with each other at least at two positions symmetrical about 180 °. Therefore, the biasing spring can be stably engaged with the holder-side engaging portion.

According to the fifth aspect of the present invention, at least one of the holder and the biasing spring is provided with the spring side engaging portion at a predetermined rotational position where the spring side engaging portion is engaged with the holder side engaging portion in the radial direction. In this state, a detent means for detenting the spring is integrally formed. Therefore, the detent means can prevent the bias spring and the holder from being disengaged. Further, it is possible to prevent the generation of abnormal noise due to the rotation of the spring.

According to the sixth aspect of the invention, the rotation preventing means is composed of an engaging hole formed in the holder and extending in the radial direction, and an end of the biasing spring inserted into the engaging hole. . Therefore, the rotation stopping means can be easily configured. Further, since the rotation stopping means is configured to insert the end of the biasing spring into the engaging hole of the holder, when the brush is replaced, etc.
The spring can be easily attached and detached.

According to the invention of claim 7, claim 1
With the configuration including the brush device according to any one of 1 to 6, the number of parts can be reduced, the number of assembling steps can be reduced, and the cost can be reduced, which can contribute to the cost reduction of the motor.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a brush device 10 is provided in the housing 2 of the motor 1. The brush device 10 has a disk-shaped insulating base 11 made of synthetic resin, and a circular insertion hole 12 for inserting the rotary shaft 3 and the commutator 4 in the center of the insulating base 11. . Four holders 13 are integrally formed around the insertion hole 12 on the upper surface of the insulating base 11. The holders 13 are evenly spaced in the circumferential direction (90 ° intervals).
It is located in.

As shown in FIGS. 2 to 4, each holder 13 is formed with a housing hole 14 that penetrates in the radial direction and has a substantially square cross section. That is, the accommodation hole 14 has the outer opening 15 on the radially outer side. In addition, at a portion of the accommodation hole 14 near the outer opening portion 15, the upper portion 13a and the bottom portion 13d are opened, and the left and right side portions 13b and 13c and the engagement concave portion 16 formed continuously with the opened bottom portion 13d. have.

Here, the insulating base 11 on which the holder 13 is integrally formed is molded by a molding die (not shown) which is vertically separated. In this case, since the upper portion 13a and the bottom portion 13d of the holder 13 are opened, the upper portion 13a or the bottom portion 13d of the holder 13 opened by the molding die.
Therefore, the engaging recess 16 can be easily formed. Therefore, the structure of the molding die is not complicated. Further, in the engaging recess 16 formed in the left side portion 13b, an engaging hole 17 penetrating in the radial direction is formed in a side wall located on the outer side in the radial direction.

A substantially rectangular parallelepiped power supply brush 18 is accommodated in the accommodating hole 14 from the outer opening 15, for example. In addition, a substantially spiral urging spring that comes into contact with the rear end surface (radially outer end surface) 18a of the power feeding brush 18 and urges the brush 18 toward the commutator 4 located radially inwardly in the housing hole 14. 19 are accommodated.

The biasing spring 19 has a spirally wound portion 20 which is substantially entirely wound from one end thereof. The spirally shaped portion 20 is formed to have a diameter that allows it to be inserted into the accommodation hole 14 of the holder 13. ing. Further, the urging spring 19 has the other end (the end portion on the side opposite to the brush 18) of the spring 19
It has an engaging portion 21 formed by continuously winding the spiral portion 20 in a substantially T-shape when viewed from the axial direction.

That is, as shown in FIGS. 5 and 6, the engaging portion 21 has a left-side protruding portion 21a, a right-side protruding portion 21b, and a lower-side protruding portion which respectively protrude from the spiral portion 20 in three radially outward directions. It has three protrusions 21c. The left side protruding portion 21a and the right side protruding portion 21b are arranged at positions symmetrical by about 180 °, and the lower side protruding portion 21c is arranged at a position rotated by about 90 ° from the left side protruding portion 21a (right side protruding portion 21b). There is. In the state where the engaging portion 21 is arranged such that the straight line connecting the left and right protruding portions 21a and 21b is substantially parallel to the plane direction of the insulating base 11 as shown in FIG.
1a to 21c project outward from the accommodation hole 14 of the holder 13, and the projecting portions 21a to 21c are arranged at three corresponding corners of the accommodation hole 14 as shown in FIG. When the straight line connecting the right protruding portions 21a and 21b is parallel to the insulating base 11 (state shown in FIG. 5) and rotated by 45 ° in the counterclockwise direction, for example, the insertion hole 14 can be inserted into the accommodation hole 14. Has been done. Furthermore, each of these protruding portions 21 a to 21 c is configured to be able to be housed in the engaging recessed portion 16. In this case, the protrusions 21a to 21c
Are the engaging recesses 1 formed on the left side portion 13b.
6, engagement recess 16 formed on the right side portion 13c, bottom portion 1
It is housed in an engaging recess (hole) 16 formed in 3d.
Further, the left side protruding portion 21a is provided at the end 22
The end 22 projects outwardly in the axial direction of the spring 19, as shown in FIG. In addition, this terminal 2
The projecting length of 2 is set to be shorter than the width (radial length) of the engaging recess 16.

The biasing spring 19 having the engaging portion 21 as described above is provided with the holder 13 after the feeding brush 18 is inserted.
The left and right protrusions 21 when housed in the housing hole 14 of
From the state where the straight line connecting a and 21b is parallel to the insulating base 11 and is rotated, for example, 45 ° in the counterclockwise direction (see FIG. 6), the spiral portion 20 is inserted into the outer opening portion 15 first. . Next, when the engaging portion 21 is inserted to the position where the engaging concave portion 16 is provided, the biasing spring 19 is in a state in which the straight line connecting the left and right protruding portions 21a and 21b is parallel to the insulating base 11. 45 ° in the clockwise direction as shown in FIG.
It is accommodated in the engaging recess 16 of b, the engaging recess 16 of the right side portion 13c, and the engaging recess 16 of the bottom portion 13d (see FIG. 5).
Then, the end 22 of the biasing spring 19 provided on the left protruding portion 21a is inserted into the engaging hole 17, and the mounting of the spring 19 on the holder 13 is completed.

In the biasing spring 19 thus mounted on the holder 13, the protrusions 21a to 21c are accommodated in the engagement recesses 16 in the accommodation holes 14, so that the engagement portions 21 are radially arranged. Engage. Therefore, the urging spring 19 has the engaging portion 21 and the rear end surface 1 of the power feeding brush 18.
8a, the brush 18 is compressed and deformed to generate an urging force that urges the brush 18 inward in the radial direction, that is, toward the commutator 4 side. In this case, in the present embodiment, since the special component for preventing the compression-deformed biasing spring 19 from popping out to the outside is not required, the number of components can be reduced and the number of assembling steps can be reduced.

Further, by inserting the end 22 of the biasing spring 19 provided on the left side protruding portion 21a into the engaging hole 17, the spring 19 is prevented from rotating.
That is, since the biasing spring 19 is prevented from rotating, the engaging portion 21 and the engaging recess 16 of the spring 19 are prevented.
The spring 19 is prevented from jumping out due to the disengagement from the spring 19.

As described above, this embodiment has the following effects. (1) An engaging recess 16 is integrally formed in the housing hole 14 near the outer opening 15 of the holder 13, and the biasing spring 1
9, the end of the non-feed brush 18 on the side of the non-feeding brush 18 is radially aligned with the engagement recess 16 at a predetermined rotation position with respect to the holder 13 (a straight line connecting the left and right protruding portions 21a and 21b is parallel to the insulating base 11). The engaging portion 21 that engages at is integrally formed. Such a biasing spring 19 is at a position different from its rotational position (from the state where the straight line connecting the left and right protruding portions 21a and 21b is parallel to the insulating base 11), for example, 45 ° in the counterclockwise direction. It is inserted from the outer opening 15 of the holder 13 in a rotated state, and the engaging portion 21 of the spring 19 is engaged with the engaging concave portion 16 of the holder 13.
When it is inserted up to the position where is provided, the spring 19 is rotated to a predetermined rotation position (45 ° counterclockwise rotation).
Let Then, the engaging portion 21 of the urging spring 19 and the engaging recess 16 of the holder 13 are brought into an engaged state, and the spring 19 is immovably assembled further outward in the radial direction. Therefore, it is not necessary to use a special part for preventing the biasing spring 19 from popping out to the outside in the radial direction, so that the number of parts can be reduced, and by reducing the number of parts, the number of assembling steps can be reduced. The cost can be reduced. Therefore, the cost of the motor 1 can be reduced.

(2) Since the engaging portion 21 of the biasing spring 19 is formed at the end of the spring 19, the engaging portion 21
Can be easily formed, and the biasing force of the spring 19 is not affected.

(3) Engagement recess 16 provided in the holder 13
And three protrusions 21a provided on the biasing spring 19
21c, the holder 13 and the spring 19 are engaged with each other in the radial direction. Therefore, it is possible to easily form a means for engaging the holder 13 and the spring 19 in the radial direction.

(4) The holder 13 is formed integrally with the insulating base 11, and the engaging concave portion 16 has an upper portion 13 of the holder 13.
a and the bottom portion 13d are formed in the accommodation hole 14 at the open portion. Therefore, when the insulating base 11 on which the holder 13 is integrally formed is formed by a mold that separates vertically,
By the mold, the upper part 13a of the opened holder 13
Alternatively, the engagement recess 16 can be easily formed from the bottom portion 13d.

(5) The engaging concave portion 16 of the holder 13 and the engaging portion 21 of the biasing spring 19 are engaged with each other at least at two symmetrical positions of 180 °. Therefore, the biasing spring 19 can be stably engaged with the engaging recess 16 of the holder 13.

(6) An engaging hole 17 extending in the radial direction is formed in the engaging recess 16 of the holder 13, and a biasing spring 19 is provided.
The end 22 of the spring is inserted into the engagement hole 17 of the spring 13 in a state where the engagement portion 21 of the biasing spring 19 and the engagement recess 16 of the holder 13 are arranged at a predetermined rotational position for radial engagement. There are 19 detents. Therefore, it is possible to prevent the engagement portion 21 of the biasing spring 19 and the engagement concave portion 16 of the holder 13 from being disengaged.
Further, it is possible to prevent generation of abnormal noise due to rotation of the spring 19 due to vibration or the like. Also, spring 1
Since the means for preventing rotation of 9 is configured to insert the end 22 of the biasing spring 19 into the engagement hole 17 of the holder 13, it can be easily configured. Also, because of the same configuration,
The urging spring 19 can be easily attached and detached when the brush 18 is replaced.

The embodiment of the present invention may be modified as follows. In the above-described embodiment, the holder 13 is integrally formed with the insulating base 11, but the insulating base and the holder may be separate bodies and assembled together.

In the above embodiment, the biasing spring 19 is used.
By forming the engaging portion 21 having the three projecting portions 21a to 21c on the above and forming the engaging concave portion 16 on the holder 13, the means for engaging the spring 19 with the holder 13 is constituted. It is not limited and may be changed as appropriate.

For example, the number and shape of the protrusions 21a to 21c may be changed appropriately. In addition, the engaging recess 16 is formed on both sides 1
3b, 13c and the bottom portion 13d are formed continuously, but independent engaging recesses may be provided on both side portions 13b, 13c and the bottom portion 13d. In this case, both sides 13b, 1
3c and the bottom 13d are provided with engaging recesses independently provided with the protrusions 21a to 21c, the spring 1
Nine detents can be provided. In addition, the engaging recess 16
The upper part 13a and the bottom part 13d of the holder 13 are formed.
Either one of them may be opened. That is, the upper one
If at least one of 3a and the bottom portion 13d is open, the engaging recess 16 can be easily formed by a mold that is vertically separated. Further, as described above, when the holder is formed separately from the insulating base, the upper portion of the holder may be closed and the engaging concave portions may be provided on the upper portion and both side portions.

In the above embodiment, the engagement hole 17 provided in the holder 13 is formed, and the terminal 22 of the biasing spring 19 is inserted into the engagement hole 17 to form a rotation stopping means for the spring 19. However, the configuration is not limited to this, and may be changed as appropriate.

For example, the position at which the engagement hole 17 is provided may be changed. Also, as described above, both side portions 13b, 13c
And the bottom portion 13d are provided with independent engaging recesses, and the engaging recesses and the protrusions 21a to 21c are engaged with each other to prevent the spring 19 from rotating.
It is not necessary to form the terminal 22 of 9. Also, the protrusion 2
At least one of 1a to 21c may be provided with a protrusion that engages in the rotation direction of the spring 19. Even in this case, it is not necessary to form the terminal 22 of the spring 19.

In the above embodiment, the accommodation hole 14 has a substantially square cross section, but it may have a rectangular shape other than a square. In the above embodiment, the insulating base 11 has four holders 13
However, a plurality other than four may be provided.

[0039]

As described in detail above, according to the present invention,
It is possible to provide a brush device and a motor that can reduce the number of parts, reduce the number of assembly steps, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a motor of this embodiment.

FIG. 2 is an enlarged cross-sectional view of a brush device.

FIG. 3 is a perspective view of a brush device.

FIG. 4 is an exploded perspective view of the brush device.

FIG. 5 is an enlarged view of the brush device as viewed from the rear end side of the brush.

FIG. 6 is an enlarged view showing a state in which the brush device is being assembled, as seen from the rear end side of the brush.

[Explanation of symbols]

10 ... Brush device, 11 ... Insulation base, 13 ... Holder, 1
3a ... upper part, 13b, 13c ... side part as inner part, 1
3d ... bottom part as inner part, 14 ... accommodation hole, 15 ... outer opening part, 16 ... engagement concave part as holder side engaging part, 17
... Engagement holes that constitute the rotation stopping means, 18 ... Power supply brush,
18a ... Rear end face, 19 ... Energizing spring, 21 ... Engaging part as spring side engaging part, 21a-21c ... Projection part, 22 ... Terminal which comprises rotation stopping means.

Claims (7)

[Claims] 1. A power feeding brush having a substantially rectangular parallelepiped shape, a substantially helical biasing spring that pushes a rear end surface of the power feeding brush and biases the power feeding brush rearward inward in a radial direction, and an accommodation hole penetrating in a radial direction in a substantially rectangular shape. A brush device having an insulating base provided with a plurality of holders for accommodating the power feeding brush and the biasing spring therein, wherein a holder side engaging portion is provided in an accommodating hole near an outer opening of the holder. Is integrally formed with a spring-side engaging portion that is radially engaged with the holder-side engaging portion at a predetermined rotation position with respect to the holder. The brush device is characterized by being. 2. The brush device according to claim 1, wherein the holder-side engagement portion is an engagement recess formed inside the accommodation hole, and the spring-side engagement portion is the biasing member. A brush device, which is a protrusion that protrudes outward in the radial direction of the spring. 3. The brush device according to claim 2, wherein the holder is integrally formed with the insulating base made of resin, and the engagement recesses are formed on an upper portion and a bottom portion of the holder. A brush device, characterized in that at least one of the brush holes is formed in the accommodation hole at an open portion. 4. The brush device according to claim 1, wherein the holder-side engaging portion and the spring-side engaging portion are engaged at least at two positions that are substantially 180 ° symmetrical to each other. A brush device characterized by: 5. The brush device according to claim 1, wherein at least one of the holder and the urging spring is provided with the spring-side engaging portion and a diameter of the holder-side engaging portion. 2. A brush device, characterized in that a detent means for detenting the spring is integrally formed in a state in which the spring is arranged at the predetermined rotational position for engagement in the direction. 6. The brush device according to claim 5, wherein the detent means includes a radially extending engagement hole formed in the holder, and an end of the biasing spring inserted into the engagement hole. A brush device comprising: 7. A motor comprising the brush device according to any one of claims 1 to 6.