JP2582468Y2 - Temporary holding structure of brush in motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for temporarily holding a brush in a motor having a brush which comes into sliding contact with a commutator.

[0002]

2. Description of the Related Art
A brush of this type of motor is mounted on a brush stay so as to elastically slide against a commutator formed on an armature shaft. However, when inserting the armature shaft into the through hole of the brush stay, the brush protruding toward the shaft center becomes an obstacle, so it is necessary to retract the brush against the urging force of the brush ammunition. . Therefore, a locking portion capable of locking the brush in the retracted position is provided on the brush stay, and the armature shaft is inserted while the brush is temporarily held in the locking portion. However, with the conventional type, after the armature shaft is inserted, it is necessary to separately release the temporary holding for each brush, making assembly work cumbersome and complicated, and there is a concern that the release work may be forgotten. I'm sorry.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in order to provide a structure for temporarily holding a brush in a motor which can eliminate these disadvantages. and end case for supporting the output-side portion of the armature shaft, the printing element stays that will be supported by entering fitted to the end case, a plate-shaped brush bullet machine base end portion is supported on the brush stay, the A brush attached to a leading end of the brush ammunition, wherein the brush is configured to be brought into sliding contact with a commutator on the armature shaft side by a biasing force of the brush ammunition. the, the temporary holding portion for holding the brush to commutator spaced attitude to temporarily hold the brush bullets machine, Atsuteka on the brush stay
One while providing at least a notch facing the brush of remote position, at a site brush stay end case is fitted is
It is characterized in that a release projection is provided which is fitted into the notch, and comes into contact with and presses the brush side in the separated posture to release the temporary holding of the brush ammunition. According to the present invention, with this configuration, the work of releasing the temporarily held brush is not required, so that the workability is remarkably improved, and the reliability can be improved by eliminating forgetting to release the brush. It is.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a motor having a speed reduction mechanism, and a casing 2 of the motor 1 includes a bottomed cylindrical yoke 3 and an end case 4 attached to an open end of the yoke 3. Various members such as a permanent magnet 5, an armature shaft 6, and an armature core 7 are incorporated in the yoke 3, and a speed reduction mechanism 8 is incorporated in the end case 4. The basic structure of these components is as follows. All are the same as before.

Reference numeral 9 denotes a bottomed tubular brush stay formed of an insulating resin material. The brush stay 9 has a tubular portion 9a at a portion where the yoke 3 and the end case 4 are assembled. Are attached to the yoke 3 and the cylinder bottom side to the end case 4, respectively. The cylinder bottom 9b of the brush stay 9 is integrated with the tip of the armature shaft 6. A through hole 9c through which a worm gear portion 10 formed to freely pass through is formed at the center portion, and a base end portion of a pair of plate-shaped brush ammunition 11 is provided on the inner cylinder side of the cylinder bottom portion 9b. Are integrally supported. The brush ammunition 11 is bent (curved) into a substantially crank shape, and a brush 12 is integrally attached to a tip portion thereof. The brush 12 is configured to slidably contact the commutator 13 formed on the armature shaft 6 by the urging force of the brush ammunition 11 and to press the brush ammunition 11 against the urging force. By forcibly moving the brush 12 in the radial direction, the brush 12 can be displaced to a position separated from the commutator 13 as described later.

Reference numeral 9d denotes a temporary holding claw integrally formed on the brush stay cylinder bottom 9b (which may be the inner peripheral surface of the brush stay cylinder 9a). Although the temporary holding claw 9d is configured as described above, the brush ammunition 11 is set in a state where the brush ammunition 11 is in the separated posture as described above.
And a portion on the side edge opposite to the stay cylinder bottom portion 9b and on the tip side of the brush attachment position (the tip corner portion may be provided, but it is not necessarily required to be on the tip end side of the brush attachment position). It is designed so that it can be temporarily detachably held and locked. Further, on the outer peripheral surface of the brush stay 9, a pair of long groove-shaped notches 9e having a length from the brush stay cylinder bottom 9b to a position corresponding to the brush 12 in the separated posture are formed, and the brush 12 in the separated posture is formed. Is formed so that it can be viewed from the outer surface of the cylinder through the notch 9e. The notch 9e is further provided with a groove depth (a distance from the outer cylinder surface of the cylindrical portion 9a to the groove bottom 9f) at the cylinder bottom 9b. A) is set so that A is larger than the distance B from the outer surface of the cylindrical portion of the brush outer surface 12a in the separated posture (A> B), and when viewed from the outer surface side of the cylindrical bottom portion 9b. The outer surface 12a of the brush protrudes from the groove bottom surface 9f in the outer diameter direction and can be seen through the notch 9e.

On the other hand, a fitting portion 4a for fitting the brush stay 9 slidably in the axial direction is formed in the end case 4, and the inner peripheral surface of the fitting portion 4a has A release projection 4b is provided so as to correspond to the notch 9e. When the brush stay 9 is fitted into the end case 4, the release projection 4 b is fitted into the notch 9 e, and the brush 12 in the separated position (the brush holding machine 11 in the temporary holding position) is fitted. A portion protruding from the groove bottom surface 9f to the outside diameter side from the position of the groove bottom surface 9f from the cylinder bottom portion 9b side, and is pressed toward the armature core 7 in the axial direction, whereby the brush machine 1
The lock with the temporary holding claw 9d is released and the temporary holding of the brush 12 is automatically released. In this connection, in this case, the contact of the release projection 4b with the brush stay 9
Is set at a position immediately before being completely fitted into the end case 4, so that early release of the temporary holding is avoided. An axially long ridge 9g is formed on the outer peripheral surface of the brush stay tubular portion 9a. The ridge 9g fits the brush stay 9 to the end case 4 (or the brush stay 9). Is fitted into the yoke 3 in a light press-fitting manner to prevent simple removal, and to prevent inadvertent dropping. If the length is shorter than the length and the function of light press-fitting is exhibited in the latter half of the fitting, the fitting operation is not impaired. In this embodiment, the position is set so that the temporary holding release of the brush 12 by the release protrusion 4b is performed at the time of light press-fitting.

In the embodiment of the present invention constructed as described above, when assembling the motor 1, first, the brush bottom 12 is temporarily held in the separated position, and the cylindrical bottom 9 b side of the brush stay 9 is formed with a ridge 9 g. To the end case 4 up to a position where it comes into contact with the tip of the end case. Next, the output portion side of the armature shaft 6 into which necessary members such as the armature core 7 and the commutator 13 are incorporated is inserted and assembled from the opening end side of the brush stay 9, and the yoke 3 is inserted into the yoke 3 and the opening end of the yoke 3. 9 Insert the cover so as to face the opening end side, and in this state, the yoke 3 is forcibly pressed to the end case 4 side to be temporarily assembled in a light press-fitting state, and fixed using screws 14. In this case, The release projection 4b on the end case 4 side
Fits into the notch 9e and presses the brush 12 temporarily held in the separated position, whereby the temporary holding of the brush 12 is automatically released. Therefore, the troublesome and complicated work of releasing the temporary holding for each brush one by one becomes unnecessary, so that the workability of the assembling work can be remarkably improved, and the reliability is remarkably improved without forgetting to release. Can be.

In addition, the structure for automatically canceling the temporary holding is such that the outer surface portion 12a of the brush 12 in the separated posture has the cylindrical bottom portion 9b.
A notch 9e is formed from the cylinder bottom 9b of the brush stay 9 to a portion corresponding to the brush 12 so that the brush stay 9 can be seen from the outer surface side of the brush stay 9, and the end of the brush stay 9 is fitted to the end case 4 on the end case 4 side. Release projection 4b fitted into notch 9e
Can be simply formed, and the strength of the brush stay 9 can be effectively prevented from being impaired. In addition, the temporary holding is performed by releasing the brush 1 with the release protrusion 4b in the separated posture.
This is performed by pushing the 2 side directly to the armature core 7 side, so that the dimensional control becomes easy, and it is possible to avoid that the release timing is too early or that the release failure occurs, thereby greatly improving the reliability. It can be measured.

In implementing the present invention, the release projection may have a tapered tip as shown in FIG. 11. In such a case, the release projection is released when the temporary holding is released. There is an advantage that the brush 4 in the temporarily held state can be positively pushed toward the shaft center by the projection 4b. Also,
As a procedure for assembling the motor so that the temporary holding of the brush is automatically released, the following procedure may be used in addition to the procedure described above. That is, in a state where the brush 12 is temporarily held in the separated posture, the brush stay 9 is fitted in the end case 4 to a position where the brush stay 9 comes into contact with the tip of the ridge 9g. Next, the output portion side of the armature shaft 6 is inserted and assembled from the opening end side of the brush stay 9, and then the armature shaft 6 is forcibly pressed together with the brush stay 9 toward the end case 4 to release the temporary holding of the brush 12. Finally, the yoke 3 is covered. Further, it can be assembled in the following procedure. First, the armature shaft 6 is inserted and assembled into the brush stay 9, and after covering the yoke 3 with this, the end case 4 is assembled and the temporary holding of the brush 12 is released. As described above, various assembling procedures can be adopted, but in any case, by assembling the end case 4 and the brush stay 9, the release projection 4 b on the end case 4 side can be adopted. Fits into the notch 9e of the brush stay 9 and presses the brush 12 temporarily held in the separated position, whereby the temporary holding of the brush 12 is automatically released.

[0011]

In summary, the present invention is constructed as described above. Therefore, when the motor is assembled, the brush is temporarily held in the commutator-separated position, and the brush is temporarily held. To release, the release protrusion provided on the end case is fitted into the notch formed on the brush stay based on the fitting and assembly of the brush stay into the end case, and presses the brush side temporarily held in the separated position. Will be done automatically. Therefore, the troublesome and complicated work of releasing the temporary holding for each brush one by one becomes unnecessary, so that the workability of the assembling work can be remarkably improved, and the reliability is remarkably improved without forgetting to release. Can be. In addition, the structure for automatically releasing the temporary holding is provided by a notch having a length extending from the bottom of the brush stay to the corresponding portion of the brush so that the outer surface of the brush in the separated position can be viewed from the outer surface of the bottom of the brush stay cylinder. On the other hand, the end case side may have a simple configuration in which a release projection that fits into the cutout portion is formed on the end case side together with the fitting of the brush stay to the end case, and the strength of the brush stay is impaired. Can be effectively avoided. In addition, release of the temporary holding is performed by directly pushing the brush side of the release posture with the release protrusion, so that dimensional control becomes easy, and release timing is too early or release failure occurs. Can be avoided and reliability can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view of a motor.

FIG. 2 is a sectional view of a yoke part.

FIG. 3 is a front view of an end case.

FIG. 4 is a partial cross-sectional side view of an end case.

FIG. 5 is a partial cross-sectional rear view of the end case.

FIG. 6 is a front view of a brush stay.

FIG. 7 is a side view of the brush stay.

FIG. 8 is a partial cross-sectional rear view of the brush stay.

FIG. 9 is a perspective view showing the assembly of the end case and the brush stay.

FIG. 10 is an explanatory diagram showing temporary holding release.

FIG. 11 is a cross-sectional view of a release projection showing another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 3 Yoke 4 End case 4b Release projection 6 Armature shaft 9 Brush stay 9b Tube bottom 9d Temporary holding claw 9e Notch 11 Brush ammunition 12 Brush 13 Commutator

Claims (1)

(57) [Scope of request for utility model registration] And 1. A end case for supporting the output-side portion of the armature shaft, Ru is supported by entering fitted to the end case
A printing element stays, the supported plate-like brush bullet machine base end on the brush stay, and a brush attached to the distal end of the該刷Ko bullet machine, the urging force of該刷Ko is brush bullet machine Therefore, in the motor configured so as to resiliently contact the commutator on the armature shaft side, the brush stay includes a temporary holding portion for temporarily holding the brush machine and holding the brush in the commutator separated position. , At least on the brush stay
While also provided a notch facing the brush of remote position, the site where brush stay end case is fitted and fitted into the notch, the brush bullets presses and brought into contact with the brush side of the remote position A temporary holding structure for a brush in a motor, comprising a release projection for releasing temporary holding of the machine.