JPH1056761A - Temporary holding device for brush in motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a temporary holding device in which the temporary holding operation of a brush is released easily and in which there is no fear of damaging a pigtail. SOLUTION: A temporary holding device comprises in such a way that a torsion-spring coupling groove 8f which couples the arm part 13a of a torsion spring 13 so as to be freely coupleable and detachable is formed at the end part on the outer-diameter side of a brush holder 8, that a pigtatil 10 is coupled to a coupling protrusion 8c in a state that the arm 13a is coupled to the elastic- mechanism coupling groove 8f and that the biasing force of the torsion spring 13 does not act on a brush 7, that the brush 7 is held temporarily in a retreat posture, that the coupling operation of the torsion-spring coupling groove 8f to the arm part 13a is released, that the biasing force of the torsion spring 13 is given to the brush 7, that the coupling operation of the pigtail 10 to the coupling protrusion 8c is released and that the temporary holding operation of the brush 7 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of electric motors used for electric components for vehicles and the like.

[0002]

2. Description of the Related Art In general, in such an electric motor, a brush for supplying electric power to an armature coil is urged by an elastic machine so as to slide on a commutator.
By the way, because such a brush is urged by an ammunition,
When the commutator does not exist, it protrudes toward the shaft center beyond the commutator sliding contact surface. For this reason, when assembling the motor, if the armature is to be assembled while the brush is in the protruding state, the brush becomes a hindrance, and the armature cannot be incorporated.
Therefore, it has been proposed that the brush is temporarily held at the locking step formed on the brush holder so that it does not protrude toward the axis when the armature is assembled. There is a problem that the operation for releasing from the locking step portion is troublesome and inferior in workability, and that a confirmation operation for forgetting to release is required. Therefore, conventionally, Japanese Utility Model Application Laid-Open No. 54-123003 and Japanese Utility Model Application Laid-Open No.
As described in Japanese Patent No. 6873, the brush is temporarily held at a position away from the commutator by locking a pigtail fixed to the brush in a locking groove or a locking projection formed in a pigtail guide groove of the brush holder. In some cases, after the armature is assembled in this state, the lock release operation can be performed using a portion of the pigtail that is pulled out from the brush holder.

[0003]

However, in the prior art which locks the pigtail, when the brush is temporarily held at a position away from the commutator, the pigtail itself is forcibly pulled while resisting the urging force of the machine. When the pigtail is to be released, the pigtail is held in a state where the brush does not protrude even when the pigtail is subjected to the biasing force of the armature. The pigtail will continue to receive the force of the gun until the lock is released, and the pigtail will be easily damaged by the force of the gun, and may be damaged or disconnected. There is
In order to cope with this, it is necessary to take measures such as increasing the strength by increasing the thickness of the pigtail, and there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has been made with the object of solving these problems, and has an advanced posture for sliding contact with a commutator and an evacuation space separated from the commutator. A brush housed in the brush holder so as to be able to move radially in and out of the posture, a spring for urging the brush toward the advance posture side, and a pigtail having one end fixed to the brush. In the motor, the armature locking part that sets the armature to the non-energized position where the brush is not energized, and the pigtail is locked when the brush is not subjected to the energizing force of the armature to temporarily hold the brush in the retracted position. Although it is possible, the pigtail is provided with a pigtail locking portion which releases the locking of the pigtail by receiving the urging force of the ammunition and allows the brush to move toward the advanced position. By doing so, the pigtail can be locked to temporarily hold the brush in the retracted posture while the urging force of the armature is not acting on the brush, and the pigtail can be effectively protected. . In addition, the release of the pigtail for temporary release of the brush is automatically performed when the brush receives the biasing force of the machine when the lock between the machine and the machine is released. Also excellent in nature. In this one,
The brush is formed by forming the pigtail locking portion in a pigtail guide groove formed in the brush holder in a radially long groove shape in a tapered shape so that the protrusion amount increases toward the brush advance posture side. The pigtail can be automatically and easily unlocked by receiving the urging force of the ammunition. Further, a guide groove is formed in the brush holder so as to radially guide a brush pressing portion of the ram in response to the radial movement of the brush, and the ram is arranged adjacent to the outer diameter end of the guide groove. By forming the locking part, the locking and unlocking of the brush pressing part and the armature locking part can be performed from the outside of the brush holder, and it is possible to confirm at a glance whether to forget to release it. It will be easier. In addition,
The armature is constituted by a torsion coil ammunition whose main body is supported by a brush holder stay, an arm portion serves as a brush pressing portion, and is immersed into the brush holder from the outer diameter end side of the brush holder to urge the brush. Can be.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an electric motor used for electric components for vehicles and the like.
A yoke 2 having a bottomed cylindrical shape, an armature shaft 3 rotatably supported by the yoke 2, an armature core 4 and a commutator 5 provided integrally with the armature shaft 3, and an inner peripheral surface of the yoke 2. It is composed of member devices such as a permanent magnet 6 to be attached and a brush 7 that slides on the commutator 5.

Reference numeral 8 denotes a brush holder for accommodating the brush 7, and the brush holder 8 is formed integrally with a brush holder stay 9 attached to the open end side of the yoke 2. The brush 7 has a rectangular tube shape with the inner end surface and the outer end surface open and facing in the radial direction. It is stored so that it can move forward and backward. Further, reference numeral 10 denotes a pigtail whose one end is connected to the brush 7 and the other end is connected to the power supply coupler 11, and 12 denotes a capacitor.

The brush holder 8 has a rectangular tube shape as described above, and a pigtail guide groove 8b having a long groove shape in the radial direction is formed on the upper surface 8a of the brush holder 8 with the outer diameter side open and the inner diameter side closed. The pigtail 10 can cope with the radial movement of the pigtail 10 accompanying the radial movement of the brush 7. Further, the pigtail guide groove 8b has a protrusion at the radially intermediate portion on the side from which the pigtail 8 is pulled out, the protrusion amount increases toward the inner diameter side, and the pigtail guide groove 8b
A tapered locking projection 8c for reducing the width of the groove is formed so as to protrude. In a state in which the urging force of the later-described bullet 13 is not acting on the brush 7, the pigtail 10 is locked to the locking projection 8c from the outer diameter side, so that the movement of the brush 7 to the inner diameter side is restricted. As a result, the brush 7 is temporarily held in the retreating posture separated from the commutator 5. That is, the groove width of the pigtail guide groove 8b formed by the locking projection 8c is determined by the brush 7 when the urging force of the elastic machine 13 is not acting on the brush 7.
Is set to a size that does not protrude from the brush holder 12 toward the inner diameter side due to its own weight. The temporary holding is performed by the brush 7 being pressed to the inner diameter side (the advance posture side) by receiving the urging force of the elastic machine 13 as described later, and
It is set to be released by moving to the inner diameter side beyond the locking projection 8c while being guided by the tapered surface of c.

Further, an elastic guide groove 8e is formed in the side surface 8d of the brush holder 8 in the form of a long groove in the radial direction which is open on the outer diameter side and closed on the inner diameter side.
In addition, a later-described arm arm portion 13a is guided.

On the other hand, the bullet 13 is provided with a coil body 13b.
Is a torsion coil ammunition supported by a brush holder stay 9, and an arm portion 13 a of the ammunition 13 is arranged so that the arm portion 13 a of the brush holder 8 extends from the outer diameter end of the armature guide groove 8 e to the inside of the cylinder of the brush holder 8. The brush 7 is configured so as to be immersed in the inner surface of the brush 7 so as to abut against the outer end surface of the brush 7 and press the brush 7 toward the inner diameter side. Further, at a portion exposed to the outside of the outer diameter side end of the brush holder 8, an armature engagement groove 8 f is formed adjacent to the outer diameter end of the above-mentioned armature guide groove 8 e. The armature locking groove 8f is configured so that the arm portion 13a can be engaged and disengaged from the outer diameter side. Then, in a state where the arm portion 13a is locked in the armature locking groove 8f,
The distal end of the arm portion 13a blocks the outer diameter side opening of the brush holder 8, and prevents the brush 7 housed inside the cylinder of the brush holder 8 from coming off from the outer diameter side opening. 13a is set so as not to interfere with the outer diameter side end of the brush 7 temporarily held in the separated posture, so that the urging force of the elastic machine 13 does not act on the brush 7. On the other hand, the arm portion 13a and the armature locking groove 8f
The arm 13a is immersed into the brush holder 8 through the guide groove 8e and the brush 7 is released.
Is pressed toward the inner diameter side, whereby the brush 7 is released from the temporary holding as described above, and is transformed into an advanced posture in which the brush 7 comes into sliding contact with the commutator 5.

In the electric motor 1 constructed as described above, when the electric motor 1 is assembled, the armature is assembled while the brush 7 is temporarily held in the retracted posture separated from the commutator 5, and then the brush 7 is released after the temporary holding is released. Is brought into sliding contact with the commutator 5, but the temporary holding is performed in a state in which the arm 13 a is engaged with the arm engaging groove 8 f of the brush holder 8, that is, the urging force of the arm 13 is applied to the brush 7. When the pigtail 10 is not acting, the pigtail 10 is locked by the locking projection 8c protruding from the pigtail guide groove 8b. On the other hand, release of this temporary holding
With the release of the lock between the arm portion 13a and the armature locking groove 8f, the arm portion 13a is immersed in the brush holder 8 and presses the brush 7 to the inner diameter side.

As described above, the temporary holding of the brush 7 is released by releasing the engagement between the arm arm 13a and the arm engaging groove 8f. In this case, the arm 13a is The brush holder 8 is drawn out from the brush holder 8, and the drawn-out portion is locked in an armature locking groove 8f formed in a portion exposed to the outside of the outer diameter end of the brush holder 8. Since the release operation can be performed from the outside of the brush holder 8, the operation becomes easy, and it is possible to confirm at a glance whether the release has been forgotten.

Further, in this case, the urging force of the ram 13 does not act on the brush 7 in the temporarily held state, so that the pigtail acts against the ram's urging force because the urging force of the ram acts on the brush. The pigtail 10 is unlikely to be damaged by the biasing force of the armature as in the conventional case that must be locked in a state where the pigtail 10 is locked, and the pigtail 10 is highly reliable without increasing the strength more than necessary. be able to.

The present invention is, of course, not limited to the embodiment described above.
4 can also be implemented in the case of the compression coil ammunition 15 housed on the outer diameter side. In this case, for example, as shown in FIG. 6, the end of the brush 15 on the brush pressing side (the side in contact with the outer diameter side end face of the brush 7) is pulled out from the brush holder 14, and the drawn pressing portion 15a Is guided by a guide groove 14a formed in the brush holder 14, and an engaging portion 14 formed so as to be adjacent to the outer diameter end of the guide groove 14a.
b so that the pressing portion 15a is engaged with the brush 7 so that the urging force of the armature 15 does not act on the brush 7 in the temporary holding state, and the engagement of the armature 15 for releasing the brush 7 from the temporary holding state. The release of the stop can be performed from outside the brush holder 14. And in this case, the guide groove 14a can also contribute to restricting the careless movement of the brush contact portion of the compression coil bullet 15. Also, it is not always necessary to form the armature locking portion on the brush holder, but it can also be formed by projecting a projection on the brush holder stay, etc. It goes without saying that this configuration is also possible.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an electric motor.

FIG. 2 is a front view of a brush holder stay.

FIG. 3A is a plan view of a brush holder, and FIG. 3B is a front view of the brush holder.

FIG. 4 is a perspective view showing a temporary holding state of the brush.

5A is a plan view of a main part showing a brush temporary holding state and FIG. 5B is a temporary holding releasing state. FIG.

FIG. 6 is a perspective view showing another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electric motor 5 commutator 7 brush 8 brush holder 8 b pigtail guide groove 8 c locking projection 8 e bullet guide groove 8 f bullet locking groove 10 pigtail 13 bullet 13 a arm 13 b coil body

Claims (4)

[Claims] 1. A brush housed in a brush holder so as to be able to move forward and backward in a radial direction between an advanced position in sliding contact with a commutator and a retracted position separated from the commutator, and an elastic machine for urging the brush toward the advanced position. And a pigtail having one end fixed to the brush.
An armature locking part that puts the ammunition in a non-energized position where the brush is not energized, and a pigtail that locks the pigtail when the brush does not receive the energizing force of the armature can temporarily hold the brush in the retracted position,
A temporary brush holding device for a motor, comprising: a pigtail locking portion that releases a pigtail lock by receiving an urging force of an ammunition and allows the brush to move toward an advanced posture. 2. The pigtail engaging portion according to claim 1, wherein the pigtail engaging portion is formed in the pigtail guide groove formed in the brush holder in a radially long groove shape so as to project in a tapered shape so that the projecting amount increases toward the brush advance posture. A temporary holding device for a brush in a motor which is a locking projection. 3. The brush holder according to claim 1, wherein the brush holder has a guide groove for guiding a brush pressing portion of the elastic machine in a radial direction so as to correspond to a radial movement of the brush. A brush temporary holding device in a motor in which an elastic locking portion is formed adjacent to a radial end portion. 4. The brush machine according to claim 1, 2 or 3, wherein the main body is supported by the brush holder stay, and the arm portion serves as a brush pressing portion and is sunk into the brush holder from the outer diameter end side of the brush holder. A temporary holding device for a brush in a motor composed of a torsion coil ram that urges the brush.