JPH0662776U - Brush temporary holding structure in motor - Google Patents

Abstract

(57) [Abstract] [Purpose] When assembling the motor, it is not necessary to release the brush temporarily held in a position away from the commutator. A brush stay 9 is provided with a notch 9e for exposing the outer surface of the brush 12 in a separated posture from the outer surface side of the brush stay cylinder bottom 9b, while the inner peripheral surface of the brush stay fitting portion 4a of the end case 4 is provided. Is provided with a release protrusion 4b which is fitted into the cutout portion and comes into contact with the brush in the separated posture to release the temporary holding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temporary holding structure of a brush in a motor including a brush that comes into elastic contact with a commutator.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, the brush of this type of motor is attached to the brush stay so as to elastically contact the commutator formed on the armature shaft. However, when inserting the armature shaft into the through hole of the brush stay, the brush protruding toward the axis interferes, so it is necessary to retreat the brush against the urging force of the brush ammo. Become. Therefore, the brush stay is provided with a locking portion capable of locking the brush in the retracted posture, and the armature shaft is inserted while the brush is temporarily held in the locking portion. However, in the conventional model, it is necessary to separately release the temporary holding for each brush after inserting the armature shaft, which makes the assembling work troublesome and complicated, and there is a fear of forgetting the releasing work. It is a problem.

[0003]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a temporary holding structure for a brush in a motor that can eliminate these drawbacks in view of the above-mentioned circumstances, in which the output side portion of the armature shaft is rotatably supported. An end case, a bottomed cylindrical brush stay fitted and supported in the end case from the bottom side of the cylinder, and a plate-shaped brush bullet machine whose base end is supported by the inner side of the brush stay, A brush attached to the tip of a brush bullet machine, wherein the brush is configured to be in sliding contact with the commutator on the side of the armature shaft by the biasing force of the brush bullet machine in a resilient pressure manner. Includes a temporary holding part for temporarily holding the brush ammunition to hold the brush in the commutator separated posture, and a brush with a length from the bottom of the brush stay cylinder to the brush corresponding position in the separated posture and at least in the separated posture. A notch having a depth that exposes the surface from the outer surface side of the bottom of the brush stay cylinder is provided, while the inner peripheral surface of the end case where the brush stay is fitted is fitted into the notch, and the brush is in a separated posture. It is characterized in that it is provided with a release projection which comes into contact with the side and presses it to release the temporary holding of the brush bullet machine. With this configuration, the present invention makes it possible to improve the workability by eliminating the work of releasing the temporarily held brush and significantly improving workability, and eliminating forgetting to release the brush. It is a thing.

[0004]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a motor with a speed reduction mechanism, and a casing 2 of the motor 1 is configured by using a bottomed cylindrical yoke 3 and an end case 4 assembled to an opening 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 reduction mechanism 8 is incorporated in the end case 4. Are conventional.

Reference numeral 9 denotes a bottomed cylindrical brush stay formed of an insulating resin material. The brush stay 9 is a cylindrical portion 9 at the assembly portion of the yoke 3 and the end case 4. The opening end side of a is fitted in the yoke 3 and the bottom side of the cylinder is fitted in the end case 4, respectively. The bottom end 9b of the brush stay 9 is attached to the tip end of the armature shaft 6. A through hole 9c through which the integrally formed worm gear portion 10 freely passes is formed in the center portion, and a base of a pair of plate-shaped brush bullets 11 is provided on the inner cylinder side of the cylinder bottom portion 9b. The ends are integrally supported. The brush bullet machine 11 is bent (curved) in a substantially crank shape, and a brush 12 is integrally attached to the tip end thereof. The brush 12 is constructed so as to be brought into sliding contact with the commutator 13 formed on the armature shaft 6 by the biasing force of the brush bullet machine 11 in an oppressing manner, and the brush bullet machine 11 is resisted against the biasing force. By forcibly moving the brush 12 in the outer diameter direction, the brush 12 can be displaced to a posture in which it is separated from the commutator 13, as described later.

Reference numeral 9d denotes a temporary holding claw integrally formed on the brush stay cylinder bottom portion 9b (which may be the inner peripheral surface of the brush stay cylindrical portion 9a). As described above, the temporary holding claws 9d are formed on the side edge of the brush bullet machine 11 facing the stay cylinder bottom portion 9b in the state where the brush bullet machine 11 is in the separated posture as described above, and It is designed so that it can be temporarily held and locked detachably at the tip end side of the brush attachment position (it may be the tip corner part, but not necessarily the tip end side of the brush attachment position). 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. 12 is configured to face the outside surface of the cylinder through the cutout portion 9e. Further, the cutout portion 9e has a groove depth in the cylinder bottom portion 9b (from the outer cylinder surface of the cylindrical portion 9a to the groove bottom surface 9f). Is set to be 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), from the outer surface side of the cylindrical bottom portion 9b. When viewed, the outer surface 12a of the brush protrudes in the outer diameter direction from the bottom surface 9f of the groove and can be seen through the notch 9e.

On the other hand, the end case 4 is provided with a fitting portion 4a for fitting the brush stay 9 therein such that the brush stay 9 is slidable in the axial direction. The inner peripheral surface of the fitting portion 4a is A release protrusion 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 protrusion 4b is fitted into the notch 9e, and the brush 12 in the separated posture (the brush bullet machine 11 in the temporary holding posture). The bottom surface 9b of the groove bottom surface of the groove bottom surface 9b of the groove bottom surface 9f of the groove bottom surface 9f is contacted from the cylinder bottom portion 9b side to press it toward the armature core 7 side in the axial direction. The temporary holding claw 9d of the brush 11 is released, and the temporary holding of the brush 12 is automatically released. Incidentally, in this case, the abutment of the release projection 4b is set at a position just before the brush stay 9 is completely fitted into the end case 4, so that an early release of the temporary holding is avoided. It is configured. The outer peripheral surface of the brush stay tubular portion 9a is formed with a ridge portion 9g that is long in the axial direction. The ridge portion 9g fits the brush stay 9 to the end case 4 (or the brush stay 9). (It is fitted to the yoke 3) by lightly press-fitting it to prevent it from coming off accidentally, and as shown in the figure, fit the ridge 9g. If the length is set shorter than the length and the function of light press-fitting is exhibited in the latter half of the fitting, the fitting work will not be impaired. In this embodiment, the temporary holding release of the brush 12 by the release protrusion 4b is set to be performed at the time of light press-fitting.

In the embodiment of the present invention configured as described above, in assembling the motor 1, first, the brush 12 is temporarily held in the separated posture, and the cylindrical bottom 9b side of the brush stay 9 is provided with the protrusion 9g. It is fitted in the end case 4 up to the position where it hits the tip of the. Next, from the opening end side of the brush stay 9, the output side of the armature shaft 6 in which the necessary members such as the armature core 7 and the commutator 13 are incorporated is inserted and incorporated, and the yoke 3 and the opening end of the yoke 3 are connected to the brush. The lid is inserted and covered so as to face the opening end side of the stay 9, and the yoke 3 is forcibly pressed against the end case 4 side in this state to be temporarily assembled into a light press-fitting state and fixed with the screw 14. In this case, the release protrusion 4b on the end case 4 side is fitted into the notch 9e and presses the brush 12 temporarily held in the separated posture, whereby the temporary holding of the brush 12 is automatically released. Will be. Therefore, the troublesome and complicated work of releasing the temporary holding for each brush is not required, and the workability of the assembling work can be significantly improved, and the reliability is improved without forgetting the release. be able to.

In addition, the structure for automatically releasing the temporary holding is configured such that the outer surface portion 12a of the brush 12 in the separated posture faces the outer surface side of the cylindrical bottom portion 9b from the cylindrical bottom portion 9b of the brush stay 9 corresponding to the brush 12. It is simple to form a notch 9e extending to the end case 4 and to form a release protrusion 4b on the end case 4 side that fits into the notch 9e in association with the fitting of the brush stay 9 to the end case 4. With such a configuration, it is possible to effectively prevent the strength of the brush stay 9 from being impaired. In addition, the temporary holding is released by pushing the brush 12 side in the separated posture directly to the armature core 7 side by the release protrusion 4b, which facilitates the dimensional control and causes the release timing to be too early or the release failure to occur. By avoiding the occurrence of such problems, the reliability can be greatly improved.

In implementing the present invention, the releasing protrusion may have a tapered tip as shown in FIG. 11. In such a case, the releasing protrusion is released when the temporary holding is released. The protrusion 4b has an advantage that the brush 12 in the temporarily held state can be positively pushed toward the shaft core side. Further, the procedure for assembling the motor so that the temporary holding of the brush is automatically released may be not only the procedure described above but also the following. That is, with the brush 12 temporarily held in the separated posture, the brush stay 9 is fitted into the end case 4 up to a position where the brush stay 9 abuts against the tip of the protrusion 9g. Next, the output part side of the armature shaft 6 is inserted and incorporated 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 side to temporarily hold the brush 12. Release and finally cover the yoke 3. Furthermore, it is possible to assemble by the following procedure. First, the armature shaft 6 is inserted and incorporated into the brush stay 9, the yoke 3 is covered with this, and the end case 4 is assembled to release the temporary holding of the brush 12. As described above, various assembling procedures can be adopted. However, no matter which procedure is adopted, by assembling the end case 4 and the brush stay 9 with each other, the release projection 4b on the end case 4 side can be installed. Is pressed into the notch portion 9e of the brush stay 9 and presses the brush 12 temporarily held in the separated posture, whereby the temporary holding of the brush 12 is automatically released.

[0011]

[Operation effect]

 In short, since the present invention is configured as described above, when the motor is assembled, the brush can be temporarily held in the commutator separated posture, but the temporary holding release of the brush is Based on the fitting of the brush stay into the end case, the release protrusion provided in the end case fits into the notch formed in the brush stay and automatically presses the brush side temporarily held in the separated posture. Will be done. Therefore, the troublesome and complicated work of releasing the temporary holding for each brush is not required, and the workability of the assembling work can be significantly improved, and the reliability will be improved without forgetting the release. You can Moreover, the structure for automatically releasing the temporary holding is such that a notch having a length from the cylinder bottom portion of the brush stay to the brush-corresponding portion is provided so that the outer surface portion of the brush in the separated posture faces the outer surface side of the brush stay cylinder bottom portion. On the side of the end case, a simple structure is only required to form a release protrusion that fits into the cutout part when the brush stay is fitted to the end case. Can be effectively prevented from being damaged. In addition, the temporary holding is released by the release protrusion directly pushing the brush side in the separated posture, which facilitates the dimensional control, and may prevent the release timing from being too early or release failure. It can be avoided and the reliability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a front view of a motor.

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

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

FIG. 4 is a partial 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 an assembly of an end case and a brush stay.

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

FIG. 11 is a cross-sectional view of a release protrusion 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 cylinder bottom 9d temporary holding claw 9e notch 11 brush ammunition machine 12 brush 13 commutator

Claims (1)

[Scope of utility model registration request] 1. An end case that axially supports an output side portion of an armature shaft, a bottomed cylindrical brush stay that is fitted into and supported by the end case from the bottom side of the cylinder, and a base end of a brush stay inner cylinder. A plate-shaped brush bullet supported on the side and a brush attached to the tip of the brush bullet, and the brush is pressed by the urging force of the brush bullet to the commutator on the armature axis side. In the motor configured to be in sliding contact, the brush stay is temporarily held by the brush stay to hold the brush in a commutator separated posture, and the brush stay in a separated posture from the bottom of the brush stay corresponds to the brush. A notch having a depth that reaches the position and at least the outer surface of the brush in the separated posture is exposed from the outer surface of the bottom of the brush stay cylinder, while the inner peripheral surface of the end case into which the brush stay fits is provided. Fit in the notch Then, a provisional holding structure for the brush in the motor is provided, which is provided with a release protrusion that comes into contact with and presses the brush side in the separated posture to release the provisional holding of the brush bullet machine.