JP3437791B2 - Brush holding structure and DC machine in DC machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holding structure for a DC machine and a DC machine equipped with the brush holding structure.

[0002]

2. Description of the Related Art For example, a motor unit of a vehicle wiper device is a DC motor housed in a housing,
It consists of a worm gear for deceleration. The size of the housing is almost determined by the volume occupied by the DC motor or the worm gear. Therefore, in order to downsize the motor unit, it is required to reduce the maximum length and the maximum diameter of the DC motor.

The maximum diameter of the DC motor is such that the maximum diameter of the brush is held so as to extend in the radial direction with respect to the central axis of the armature in a plane orthogonal to the central axis and to be movable in the radial direction. It is determined by the length and the size of the portion of the biasing spring structure that biases the brush in the same radial direction and makes sliding contact with the commutator, and is arranged outside the brush in the moving direction. Therefore, as a biasing spring structure for reducing the size of the portion arranged outside the brush, there is a structure using a torsion coil spring 50 as shown in FIGS.

This biasing spring structure has a support shaft provided next to the brush 52 held on the holding surface 51a of the brush holding plate 51 provided on the motor so as to extend in the central axis direction of the armature 53. 54, and a torsion coil spring 50 supported by the coil portion 55 being fitted into the support shaft 54. One of the both ends extending from the coil portion 55 of the torsion coil spring 50 is used as the urging end 56 as the brush 51.
Of the fixed end 57.
Is engaged with a retaining recess 59 of a spring retaining portion 58 provided on the retaining surface 51a so as to be adjacent to the support shaft 54.
The torsion coil spring 50 is used in a state in which the respective end portions 56 and 57 are circumferentially extended from the coil portion 55. That is, as shown in FIGS. 4 and 5, the biasing end 56 of the torsion coil spring 50 is in contact with the base end surface of the brush 52 while extending from the coil portion 55 in the circumferential direction. Similarly, the fixed end 57 is locked in the locking recess 59 while extending in the circumferential direction from the coil portion 55. According to this biasing spring structure, the portion of the brush 52 that is disposed in the moving direction outside the brush 52 can be only the tip end portion of the biasing end 56, so the maximum diameter of the DC motor can be reduced. .

By the way, when assembling a DC motor,
The brush 52 uses the torsion coil spring 50 to move the commutator 60.
The armature 53 or the torsion coil spring 5 must be assembled so as to be biased to the outer peripheral surface of the armature 53.
Assembly of 0 is not easy. Therefore, in the biasing spring structure shown in FIGS. 4 and 5, the fixed end 57 of the torsion coil spring 50 in which the coil portion 55 is fitted into the support shaft 54 can be easily locked in the locking recess 59. For this reason, the spring holding portion 58 is provided with a guide surface 61 for guiding the fixed end 57 to the locking recess 59.

That is, as shown in FIGS. 4 and 5, the spring holding portion 58 is formed as a part of a cylinder centered on the support shaft 54, and the locking recess 59 is provided on the outer peripheral side of the spring holding portion 58. It is provided at the end. The guide surface 61 is formed on the upper end surface of the spring holding portion 58 as an inclined surface that is closer to the holding surface 51a side toward the outer peripheral side than the inner peripheral side. Then, when the torsion coil spring 50 is assembled, the coil portion 5
When the urging end 56 of the coil spring 50 which is in a natural state just by inserting 5 into the support shaft 54 is brought into contact with the base end surface of the brush 52, the fixed end 57 is located at the innermost position of the guide surface 61. Abut. When the fixed end 57 is pressed against the guide surface 61 and moved to the outer peripheral side from this state, the coil portion 55 is twisted and deformed, and the fixed end 57 is locked from the guide surface 61 to the locking recess 59 as it is. It Therefore, according to this biasing spring structure, the torsion coil spring 50 can be assembled by moving the fixed end 57 along the guide surface 61, and the workability is improved.

[0007]

However, in the above brush holding structure, the guide surface 61 is formed so as to be separated from the holding surface 51a toward the inner peripheral side at a position farther from the holding surface 51a than the locking recess 59. ing. Therefore, when the torsion coil spring 50 is assembled, the fixed end 57 is not inserted into the coil shaft 55 up to the predetermined position of the support shaft 54.
Contacts the guide surface 61. Therefore, when moving the fixed end 57 along the guide surface 61 to the locking recess 59 side, it is necessary to simultaneously perform the work operation of inserting the coil 55 into the support shaft 54, and the workability of assembly is not sufficiently high. It was

The present invention has been made to solve the above problems, and an object thereof is to reduce the maximum outer diameter of a DC machine and to assemble a torsion coil spring for urging a brush. (EN) Provided is a brush holding structure in a DC machine that can improve workability, and a DC machine including the brush holding structure.

[0009]

In order to solve the above problems, the invention according to claim 1 is a component of a DC machine and is provided on the holding surface side of a brush holder through which an armature is inserted. A brush holder that movably holds a brush on the armature side, and a brush provided on the holding surface so as to extend parallel to the central axis of the armature, and within the length range of the brush in the moving direction. A support shaft that is adjacent to the main shaft in the direction of the central axis, and a coil portion is supported by the brush holder by being inserted into the support shaft, and the first end portion of the coil portion on the holding surface side. The urging end extending in the circumferential direction from the front end of the coil portion is in contact with the base end face of the brush, and the urging end is in contact with the base end face of the brush.
The fixed end extending in the circumferential direction from the second end on the side opposite to the holding surface side is held at a position where the coil portion is twisted and deformed, so that the fixed end slides on the commutator of the armature. A torsion coil spring whose biasing end can bias the brush, and a torsion coil spring that is provided on the holding surface so as to be adjacent to the support shaft. The biasing end of the torsion coil spring is brought into contact with the base end surface of the brush to form the coil. A locking recess that locks the fixed end in a state in which the fixed end extends substantially circumferentially from the second end of the coil part in a state where the fixed end is twisted and deformed, and the fixed end is formed by twisting the coil part. in the brush holding structure in the DC machine and a spring holding portion having a guide surface for guiding the fixed end so as to engaged with the locking recess, the spring holding portion of the coil portion Opposite to the holding surface side
The fixed end extending in the circumferential direction from the second end portion on the side is elastically deformed and moved in the direction away from the holding surface in the central axis direction from a state in which the fixed end is hardly elastically deformed in the central axis direction. The guide surface is formed so as to be locked in the locking recess, and the spring holding portion is centered on the support shaft.
Is formed in a shape that forms a part of a cylindrical shape , and a portion of the brush that is arranged in the moving direction of the brush radially outward of the central axis of the armature is the tip of the urging end of the torsion coil spring. This is a brush holding structure in a DC machine that has only parts.

According to a second aspect of the present invention, there is provided a brush holder, which is a component of a DC machine and is provided on a holding surface side of a brush holder through which an armature is inserted and which holds the brush movably on the armature side. And a support that is provided on the holding surface so as to extend parallel to the central axis of the armature and that is adjacent to the brush at a position overlapping with the brush in the central axis direction within the length range of the brush in the moving direction. The shaft and the coil portion are supported by the brush holder by being inserted into the support shaft, and the urging end extending in the circumferential direction from the first end portion of the coil portion on the holding surface side is the brush. While abutting on the base end surface of
A position where a fixed end extending in the circumferential direction from a second end of the coil portion opposite to the holding surface side in a state where the biasing end abuts on the base end surface of the brush twists and deforms the coil portion. And a torsion coil spring whose biasing end is capable of urging the brush so as to come into sliding contact with the commutator of the armature, and the torsion coil spring which is provided on the holding surface so as to be adjacent to the support shaft. The fixed end is locked in a state in which the fixed end extends substantially in the circumferential direction from the second end portion of the coil portion while the coil portion is twisted and deformed by bringing the biasing end of the coil portion into contact with the base end surface of the brush. Direct current, and a spring holding portion having a locking concave portion for guiding the fixed end so that the fixed end is locked in the locking recess while the coil portion is twisted and deformed. In a brush holding structure for a machine, the spring holding portion It is the holding surface side of the coil portion
The fixed end extending in the circumferential direction from the second end on the opposite side is elastically deformed in a direction away from the holding surface in the same central axis direction from a state in which the fixed end is hardly elastically deformed in the central axis direction of the coil section. After that, the guide surface is formed so as to be locked in the locking recess, the spring holding portion is formed in a shape forming a part of a cylinder centered on the support shaft, and the guide surface is formed by the spring holding portion. Is provided on the upper end of the above and is formed on an inclined surface that is farther away from the holding surface from the inner peripheral side closer to the commutator to the outer peripheral side. The invention according to claim 3 is the invention according to claim 1 or 2, wherein the tip of the fixed end is used to move the fixed end along the guide surface to the locking recess. The engaging portion that can be engaged with the tool is integrally formed.

A fourth aspect of the present invention is a direct current machine provided with the brush holding structure in the direct current machine according to the first to third aspects. (Operation) According to the inventions of claims 1 and 2 , the urging end of the torsion coil spring in which the coil portion is arranged closer to the commutator than the base end face of the brush is in contact with the base end face of the brush. To the commutator side. Further, when the coil portion of the torsion coil spring is fitted and inserted to a predetermined position of the support shaft during assembly of the DC machine, the fixed end abuts on the guide surface in a state of extending from the coil portion in a substantially circumferential direction. Then, when the fixed end is moved toward the locking recess along the guide surface, the fixed end moves in a direction away from the holding surface and then engages with the locking recess while extending from the coil portion in the circumferential direction. Be stopped. Therefore, only the tip end portion of the biasing end of the torsion coil spring is arranged outside the brush in the moving direction. Further, when the fixed end is moved along the guide surface in a state where the coil portion of the torsion coil spring is fitted and inserted into the support shaft, the work operation of fitting the coil portion into the support shaft is unnecessary.

According to the invention described in claim 3, claim 1
Alternatively , in addition to the function of the invention described in claim 2 , when the torsion coil spring is assembled, the fixed end is moved along the guide surface via the tool engaged with the engaging portion provided at the tip of the fixed end. Then, the fixed end is locked in the locking recess. Therefore,
The fixed end is moved along the guide surface and locked in the locking recess by using a tool capable of gripping the fixed end more reliably than the bare hand and applying a larger force.

According to the invention described in claim 4, the brush holding structure for a DC machine either one of claims 1 to 3 one
The invention has the effect of the invention described in the section .

[0014]

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

FIG. 1 shows a brush holding plate 10 as a brush holding body housed in a casing as a component of a DC motor as a DC machine, FIG. 2 is a plane of the brush holding plate 10, and FIG. 3 is a brush holding plate 10. The respective sides are shown.

The brush holding plate 10 is integrally formed of synthetic resin, and the armature 12 provided on the output shaft 11 is inserted into the hole 10a provided at the center. The armature 12 is the commutator 1
3 is inserted so as to be arranged on the holding surface 10b side of the brush holding plate 10.

On the holding surface 10b side of the brush holding plate 10,
The brush holder 14 is integrally formed. A brush 15 is held by each brush holding portion 14 so as to be movable toward the commutator 13 side and radially movable with respect to the central axis of the armature 12. Each brush 15 is urged in the moving direction, and the tip end surface in the moving direction is brought into sliding contact with the commutator 13. Both brushes 15 are provided in a pair so as to face each other with the central axis of the armature 12 interposed therebetween.

On the holding surface 10b of the brush holding plate 10,
The brush 1 extends parallel to the central axis of the armature 12 and
The support shaft 16 is provided so as to be adjacent to the brush 15 at a position overlapping in the central axis direction within the length range of the moving direction of the brush 5. The support shaft 16 is formed integrally with the brush holding plate 10.

A torsion coil spring 17 is supported on the support shaft 16. The torsion coil spring 17 has its coil portion 18 fitted into the support shaft 16 so that the brush holding plate 1
It is supported by 0. A biasing end 19 extends in the circumferential direction from the first end 18a of the coil portion 18 on the holding surface 10b side,
The tip thereof is in contact with the base end surface of the brush 15. A fixed end 20 extends in the circumferential direction from the second end 18b of the coil portion 18. The torsion coil spring 17 has a fixed end 20.
Since the coil portion 18 is fixedly held at a position where the coil portion 18 is elastically deformed, the urging end 19 can urge the brush 15 so as to be in sliding contact with the commutator 13.

A spring holding portion 21 is provided on the holding surface 10b of the brush holding plate 10 so as to be adjacent to the support shaft 16. The spring holding portion 21 is formed integrally with the brush holding plate 10 in a shape forming a part of a cylinder centered on the support shaft 16. The spring holding portion 21 makes the fixed end 20 substantially circumferentially from the second end of the coil portion 18 in a state in which the biasing end 19 of the torsion coil spring 17 is brought into contact with the base end surface of the brush 15 and the coil portion 18 is twisted and deformed. It has a locking recess 22 that locks when extended. Also, the spring holding portion 21
Causes the coil portion 18 to be twisted and deformed, and the fixed end 2
A guide surface 23 is provided for guiding the fixed end 20 so that 0 is locked in the locking recess 22. The locking recess 22 is provided at the outer peripheral side end of the spring holding portion 21, and is provided with a guide surface 23.
Is provided on the upper end of the spring holding portion 21.

The guide surface 23 is the second end 1 of the coil portion 18.
The fixed end 20 extending in the circumferential direction from 8b is elastically deformed in a direction in which the fixed end 20 is hardly elastically deformed in the central axis direction of the coil portion 18 in a direction away from the holding surface 10b in the central axis direction, and then, the locking recess 22 is formed. It is formed so as to be locked to. That is, the guide surface 23 is formed as an inclined surface that is farther away from the holding surface 10a on the outer peripheral side than on the inner peripheral side closer to the commutator 13. In addition, the locking recess 22 has a holding surface 10a.
Is set to be substantially the same as the distance at the innermost position of the guide surface 23. In the present embodiment, the guide surface 23 has the fixed end 2 extending in the circumferential direction from the coil portion 18.
A slope whose height on the outermost side is higher than height on the innermost side by the minimum height required to lock 0 in the locking recess 22 that locks in the state of extending in the circumferential direction. Is formed in.

The fixed end 20 has a fixed end 2 at the tip thereof.
An engaging portion 24 that can be engaged with a tool used to move 0 along the guide surface 23 to the locking recess 22 is integrally formed.

A wire 27 extending from a male side terminal 26 detachably connected to an electric female side terminal 25 provided adjacent to the brush holding portion 14 on the holding surface 10b is connected to the brush 15. ing.

Each operation and effect of the brush holding structure in the DC motor configured as described above will be described. (1) When the coil portion 18 of the torsion coil spring 17 is fitted and inserted to a predetermined position of the support shaft 15 during assembly of the DC motor, the fixed end 20 extends substantially circumferentially from the second end portion 18b of the coil portion 18. In this state, the guide surface 23 comes into contact with the innermost position. Then, when the fixed end 20 is moved to the locking recess 22 side along the guide surface 23, the hand fixed end 20 moves in a direction once away from the holding surface 10b and then extends in the circumferential direction from the coil portion 18. In this state, it is locked in the locking recess 22.

In the assembled DC motor, the urging end 18 of the torsion coil spring 17 in which the coil portion 18 is arranged closer to the commutator 13 side than the base end face of the brush 15 comes into contact with the base end face of the brush 15 to cause the brush. 15 for commutator 13
Bias to the side.

Therefore, only the tip of the urging end 18 of the torsion coil spring 17 is located outside the brush 15 in the moving direction. Further, when the fixed end 20 is moved along the guide surface 23 in a state where the coil portion 18 is inserted into the support shaft 16 to a predetermined position, the work operation of inserting the coil portion 18 into the support shaft 16 is unnecessary. . As a result, the maximum diameter of the DC motor can be reduced, and the workability of assembling the torsion coil spring 17 that biases the brush 15 can be improved.

(2) When the torsion coil spring 17 is assembled, if the fixed end 20 is moved along the guide surface 23 via the tool engaged with the engaging portion 24 provided at the tip of the fixed end 20, the fixed end 20 is fixed. The end 20 is locked in the locking recess 22.

Therefore, the fixed end 20 can be guided along the guide surface 23 by using a tool capable of gripping the fixed end 20 more reliably than if it is directly gripped with bare hands and applying a larger force. It is moved and locked in the locking recess 22. As a result, the workability of assembling the torsion coil spring 17 can be further improved.

(3) The spring holding portion 21 has a coil portion 1
8 is the minimum height required to lock the fixed end 20 extending in the circumferential direction from the locking recess 22 that is locked in the state of extending in the circumferential direction, and is higher than the innermost height. The guide surface 23 formed on the slope having the highest height on the outermost peripheral side is provided.
Therefore, the spring holding portion 21 of the present embodiment is provided with the guide surface 61 which is formed on the conventional slope having the highest inner circumference and has the lowest outer circumference at a position higher than the locking recess 59. As compared with the portion 58, the holding surface 10
The height from b becomes low. As a result, even if the thickness of the spring holding portion 21 is reduced, the spring holding portion 21 is less likely to be damaged by the biasing force of the torsion coil spring 17 and the reliability of the brush holding structure is improved. Further, it is possible to reduce the size of the brush holding portion in the central axis direction of the armature 12, which contributes to the reduction in the axial direction of the DC motor.

(4) The brush 15 was applied to a DC motor provided in a pair so as to face each other with the central axis of the armature 12 interposed therebetween. Therefore, in a DC machine with a flattened casing, it is possible to reduce the maximum diameter and improve the workability of assembling the torsion coil spring 17.

(5) The brush holding plate 10 is made of synthetic resin, and the brush holding portion 14, the support shaft 16 and the spring holding portion 2 are formed.
1 was formed integrally with the brush holding plate 10. Therefore, since the brush holding portion 14, the support shaft 16, and the spring holding portion 21 can be formed as one member and the brush holding portion 14 can be formed of an insulator, the number of parts and the number of assembling steps can be reduced.

Embodiments other than the above embodiment embodying the present invention will be listed below as another example. In the above-described embodiment, the brush holding structure is provided in which the brushes 15 are provided in a pair so as to face each other with the central axis of the armature 12 interposed therebetween, but the brush holding structure is provided in which three or more brushes 15 are provided. You may.

Not limited to the brush holding structure provided on the brush holding plate 10 housed inside the casing, the brush holding structure may be provided on the end face plate forming the casing together with the yoke.

The torsion coil spring 17 is twisted and deformed so that the inner diameter of the coil portion 18 becomes smaller as in the above embodiment, so that the biasing end 19 biases the brush 15 toward the commutator 13. Coil part 1 instead of
The biasing end may be provided so as to bias the brush 15 toward the commutator 13 side by twisting and deforming so that the inner diameter of 8 becomes larger. That is, in the above-described embodiment, the torsion coil spring 17 is inverted in the central axis direction of the coil portion 18 and fitted into the support shaft 16.

Not limited to the DC motor, it may be applied to a DC generator that is a DC machine. Hereinafter, in addition to the inventions described in the claims, the technical idea grasped from the above-described embodiment or each other example will be described together with the effects thereof.

[0036] (1) of claims 1 to 3 either
In the brush holding structure for a DC machine according to any one of the above items , the brushes are provided in a pair so as to face each other with the central axis of the armature interposed therebetween. With such a configuration, in a DC machine with a flattened casing, it is possible to reduce the maximum diameter and improve workability in assembling the torsion coil spring.

[0037] (2) of claims 1 to 3 either
In the invention according to any one of claims 1 to 3 , the brush holder is made of synthetic resin, and the brush holder, the support shaft and the spring holder are integrally formed with the brush holder. With such a configuration, the brush holding portion, the support shaft, and the spring holding portion can be formed as one member, and the brush holding portion can be formed of an insulator, so that the number of parts and the number of assembling steps can be reduced. .

[0038]

As described in detail above, claims 1 to 1
According to the invention described in ( 4) , the maximum diameter of the DC machine can be shortened, and moreover, the workability of assembling the torsion coil spring for urging the brush can be improved.

[0039] According to the invention described in 請 Motomeko 3, the assembling workability of the torsion coil spring can be further improved. According to the invention of claim 4 , claim 1 to claim
In addition to the effect of the invention described in any one of items 3, the maximum outer diameter can be reduced, and the assembling time can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a brush holding structure of a DC motor.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a schematic side view of the same.

FIG. 4 is a schematic plan view showing a conventional brush holding structure of a DC motor.

FIG. 5 is a schematic side view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Brush holding plate as a brush holding body, 10b ... Holding surface, 12 ... Armature, 13 ... Commutator, 14 ... Brush holding part, 15 ... Brush, 16 ... Support shaft, 17 ... Torsion coil spring, 18 ... Coil part , 18a ... First end part, 18b ... Second end part, 19 ... Energizing end, 20 ... Fixed end, 21 ... Spring holding part, 22 ... Locking recessed part, 23 ... Guide surface, 24 ... Engaging part.

Claims (4)

(57) [Claims] 1. A brush holding part, which is a component of a DC machine, is provided on a holding surface side of a brush holding body through which an armature is inserted, and holds a brush so as to be movable to the armature side, and a brush holding part of the armature. A support shaft that is provided on the holding surface so as to extend parallel to the central axis, and that is adjacent to the brush at a position overlapping the central axis in the length range of the brush in the moving direction; The coil holder is supported by the brush holder by being fitted into the support shaft, and the urging end extending in the circumferential direction from the first end portion of the coil portion on the holding surface side is brought into contact with the base end surface of the brush. And the second end of the coil portion on the side opposite to the holding surface side in a state where the urging end is in contact with the base end surface of the brush.
A fixed end extending in the circumferential direction from the end is held at a position where the coil portion is twisted and deformed, so that the brush can be biased by the biasing end so as to slide on the commutator of the armature. A coil spring and a fixed end provided on a holding surface so as to be adjacent to the support shaft, in a state where the biasing end of the torsion coil spring is brought into contact with the base end surface of the brush and the coil portion is twisted and deformed. A locking recess that locks the coil part in a state where the coil part extends from the second end of the coil part in a substantially circumferential direction, and the coil part is twisted and deformed and the fixed end is locked in the locking recess. In a brush holding structure in a DC machine, which includes a spring holding portion having a guide surface for guiding a fixed end, the spring holding portion includes a holding surface side of the coil portion.
The fixed end extending in the circumferential direction from the second end on the opposite side is moved by elastically deforming in the direction away from the holding surface in the same central axis direction from a state in which it is hardly elastically deformed in the central axis direction of the coil part. The guide surface is formed so as to be locked in the locking recess, and the spring holding part is centered on the support shaft.
Is formed in a shape forming a part of a cylinder , and a portion arranged in the moving direction of the brush on the outer side in the radial direction with respect to the central axis of the armature of the brush is the urging end of the torsion coil spring. Brush holding structure for DC machines with only the tip. 2. A brush holding part, which is a component of a DC machine, is provided on a holding surface side of a brush holding body through which an armature is inserted, and holds a brush movably to the armature side, and a brush holding part of the armature. A support shaft that is provided on the holding surface so as to extend parallel to the central axis, and that is adjacent to the brush at a position overlapping the central axis in the length range of the brush in the moving direction; The coil holder is supported by the brush holder by being fitted into the support shaft, and the urging end extending in the circumferential direction from the first end portion of the coil portion on the holding surface side is brought into contact with the base end surface of the brush. And the second end of the coil portion on the side opposite to the holding surface side in a state where the urging end is in contact with the base end surface of the brush.
A fixed end extending in the circumferential direction from the end is held at a position where the coil portion is twisted and deformed, so that the brush can be biased by the biasing end so as to slide on the commutator of the armature. A coil spring and a fixed end provided on a holding surface so as to be adjacent to the support shaft, in a state where the biasing end of the torsion coil spring is brought into contact with the base end surface of the brush and the coil portion is twisted and deformed. A locking recess that locks the coil part in a state where the coil part extends from the second end of the coil part in a substantially circumferential direction, and the coil part is twisted and deformed and the fixed end is locked in the locking recess. In a brush holding structure in a DC machine, which includes a spring holding portion having a guide surface for guiding a fixed end, the spring holding portion includes a holding surface side of the coil portion.
After the fixed end extending in the circumferential direction from the second end on the opposite side is elastically deformed in a direction away from the holding surface in the central axis direction from a state in which the fixed end is hardly elastically deformed in the central axis direction of the coil section. The guide surface is formed so as to be locked in the locking recess, the spring holding portion is formed in a shape forming a part of a cylinder centered on the support shaft, and the guide surface is an upper end of the spring holding portion. And a brush holding structure in a DC machine, which is formed on a sloped surface which is provided farther from the holding surface and is closer to the commutator from the inner peripheral side to the outer peripheral side. 3. An engaging portion, which is engageable with a tool used for moving the fixed end to the locking recess along the guide surface, is integrally formed at the tip of the fixed end. The brush holding structure in the DC machine according to claim 1 or 2. 4. A DC machine provided with the brush holding structure in the DC machine according to claim 1. Description: