JP2773756B2 - Motor with built-in reduction mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor incorporating a speed reduction mechanism.

2. Description of the Related Art In a conventional motor, an armature is supported by bearing both ends of a shaft on a yoke, and an armature is rotated. In a configuration of a core type flat motor, a brush in which a commutator segment stands in parallel with the shaft is pressed. Was common.

The conventional flat motor has a structure in which an armature shaft is supported at both ends by yokes, and a brush for pressing the armature segments is parallel to an axis supported by the yoke. Upright, and therefore a brush and a spring that supports the brush,
Since the brush holders and the like are arranged in a direction parallel to the axis, it is difficult to make the whole thin, and furthermore, incorporating a speed reduction mechanism into this motor has a problem that the whole becomes thick. . It is an object of the present invention to provide a thin motor incorporating a speed reduction mechanism.

A motor incorporating a speed reduction mechanism for achieving the above object is mounted on a fixed bracket, and furthermore, in a yoke having a plurality of magnets arranged on an inner wall thereof, an armature core corresponding to the magnets. And a ring for transmitting one end to a shaft supported on one end of the yoke is fitted in the armature, and a base is attached to the yoke in the inner wall of the ring. On the side part, a commutator with the inner peripheral surface of the segment disposed in the axial direction is disposed, and the brush holder protruding from the base is urged in the centrifugal direction by a spring to the inner peripheral surface of the segment. An external gear that is rotatably fitted to an eccentric portion provided at the other end of the shaft is provided on a portion of the inner wall of the ring that faces the fixed bracket, and meshes with the external gear. And a speed reduction mechanism by a differential speed reduction mechanism comprising an internal gear attached to the fixed bracket, wherein the number of teeth of the external gear is slightly smaller than the number of teeth of the internal gear. It is.

According to the present invention, an armature corresponding to a plurality of magnets arranged on the inner wall of a yoke is mounted on a shaft having one end bearing on the yoke via a ring fitted to the armature, and the shaft is rotated by rotation of the armature. With the rotation of this shaft, an eccentric motion is given to the external toothed wheel fitted to the eccentric part of the shaft, and while this partially meshes with the internal toothed wheel provided on the fixed bracket, Decelerates the external toothed wheel, and takes out the decelerated output to the outside.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a motor incorporating a speed reduction mechanism according to the present invention, which will be described below with reference to FIG. In the figure, reference numeral 1 denotes a yoke having an inverted U-shaped cross section, which is attached to the fixed bracket 3 by a screw 5 so as to cover a release portion in which a ring 4 is fitted to a release end. 2, a base 6 is attached to a central portion by a screw rod or the like, and one end of a shaft 7 having an eccentric portion 7 facing the release portion is supported by a bearing 8. Further, an armature 9 including an armature core 9a and an armature winding 9b is disposed in the yoke 1 so as to face the magnet 2.
The armature 9 has a partition plate 9d at the center of the inner wall, and a ring 9c attached to the shaft 7 is fitted through the partition plate 9d to rotate the ring 9c. A cylindrical segment 10b is attached to the inner peripheral surface of the synthetic resin ring 10a at a portion of the partition plate 9d provided on the ring 9c in the direction of the base 6 so as to be transmitted to the shaft 7 via the ring 9c. A commutator 10 having an inner peripheral surface directed in the direction of the axis 7 is provided, and a brush holder 11 located in the hollow of the cylindrical segment 10b of the commutator 10 protrudes from the base 6, and a brush holder is provided. The brush 11 is provided with a brush 11 supported by a spring 11a and urged in the centrifugal direction to be pressed against the inner peripheral surface of the segment 10b of the commutator 10. The eccentric portion 7a of the shaft 7 is positioned on the inner wall of the ring 9c from the partition plate 9d in the direction of the fixed bracket 3 and cuts the meat so as to obtain a balance as shown in FIGS. An external gear 13 is fitted to the eccentric portion 7a via a bush 12. The external gear 13 has a slightly smaller number of teeth than the number of the internal gear 15 fitted and mounted in the hole 14 formed in the fixed bracket 3, and the two gears 13, 15 rotate the shaft 7. Thus, a differential reduction mechanism is formed by partially meshing the two gears via the eccentric portion 7a, and a reduction mechanism A by this differential reduction mechanism is incorporated in the inner wall of the ring 9c. A bearing 16 is interposed between the outer periphery of the internal gear 15 of the speed reduction mechanism A and the ring 9c fitted on the armature 9. The external gear 13 of the speed reduction mechanism A incorporated in the yoke 1 has a flange 13a, and a plurality of (six in the drawing) pins 13b are provided on an end face of the flange 13a.
Are integrally provided so as to protrude in the lateral direction, and the rotation of the external toothed wheel 13 is output through the pins 13b. Next, a reclining adjuster using a motor incorporating the speed reduction mechanism will be described. Reference numeral 17 denotes a movable bracket fixed to the seat back side, and a second external gear 19 is fixed to the movable bracket 17 with a rivet 18.
The bearing 20 is inserted into the shaft holes 17a, 19a formed in the gear 7 and the second external gear 19, and the outer periphery of the bearing 20 is eccentric in order to absorb the eccentric motion.
1, the pin receiving ring 21 is provided with an insertion hole 21a for inserting a pin 13b provided on the external gear 13, and the pin 13b is inserted into the insertion hole 21a via a bush 22 to provide the speed reduction mechanism. The rotation of the external gear 13 at A is transmitted. The movable bracket 17 and the second
In the external gear 19, three substantially arc-shaped long holes 23 are formed on a radius concentric with the shaft holes 17a, 19a, and a step in which one end of the fixed bracket 3 is mounted in the long holes 23. A stepped bolt 24 is loosely fitted, and the other end of the stepped bolt 24 has a slightly larger number of teeth than the second external gear 19 to partially
It is fitted into a hole formed in the second internal gear 25 meshing with the external gear 19 and is fixed to the second internal gear 25 with a nut 26. That is, the fixed bracket 3 and the second internal gear 25 sandwich the second external gear 19 and the movable bracket 17. The second internal gear 25 is fixed to the fixing bracket 3 via a stepped bolt 24.
A bush 27 is fitted into the window hole 25a, and the bush 27 further supports a shaft 21b from the pin receiving ring 21 via a bearing 28. Therefore, the reduced rotation from the external gear 13 transmits an output to the pin receiving ring 21 in which the pin 13b is inserted, and the eccentric movement of the pin receiving ring 21 causes the bearing 20 to rotate.
And the second external gear 19 is meshed with the second internal gear 25 through a second differential reduction mechanism so that the relative angle is continuously adjusted by the difference in the number of teeth. The movable bracket 17 is adjusted by giving a swing to the movable bracket 17 by a dynamic deceleration mechanism.

According to the present invention, a ring fitted in an armature is mounted on a shaft whose one end is supported by a yoke, and a commutator in which the inner peripheral surface of the segment is directed in the axial direction in the inner wall of the ring. And a reduction mechanism including an external gear fitted to the eccentric portion of the shaft and a differential reduction mechanism using an internal gear meshed with the external gear, and a segment in the commutator. The brush pressed against the inner peripheral surface of the yoke is urged from the brush holder of the base attached to the yoke in the centrifugal direction via a spring, that is, in the direction perpendicular to the axis. Even if it is embedded, the thickness of the entire motor can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a part of a flat motor attached to a reclining adjuster.

FIG. 2 is a side view of the reclining adjuster.

FIG. 3 is a front view of a commutator used for a motor.

FIG. 4 is a side view of the center longitudinal section of FIG. 3;

FIG. 5 is a front view of a shaft having an eccentric portion.

FIG. 6 is a side view as seen from the eccentric portion side in FIG. 5;

FIG. 7 is a perspective view showing a relationship between a pin of the external gear and a pin receiving ring.

[Explanation of symbols]

 Reference Signs List 1 yoke 2 magnet 3 fixing bracket 4 ring 5 screw 6 base 7 shaft 7a eccentric portion 8 bearing 9 armature 9a armature core 9b armature winding 9c ring 9d partition plate portion 10 commutator 10a synthetic resin ring 10b segment 11 brush holder 11a Spring 11b brush 12 bush 13 external gear 13a flange 13b pin 14 hole 15 internal gear 16 bearing 17 movable bracket 17a shaft hole 18 rivet 19 second external gear 19a shaft hole 20 bearing 21 pin receiving ring 21a hole 21b shaft 22 bush 23 long hole 24 stepped bolt 25 internal gear 25a window hole 26 nut 27 bush 28 bearing A reduction gear

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-55850 (JP, A) JP-A-60-37442 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 7/10-7/116

Claims (1)

(57) [Claims] An armature comprising an armature core and an armature winding corresponding to said magnet is disposed in a yoke attached to a fixed bracket and having a plurality of magnets disposed on an inner wall thereof. A ring that transmits one end to a shaft that is supported by the yoke is fitted into the yoke, and an inner peripheral surface of the semegment is oriented in the axial direction at a base direction side portion attached to the yoke in an inner wall of the ring. A commutator is provided, and the brush holder protruding from the base is provided with a brush which is urged in a centrifugal direction by a spring and pressed against the inner peripheral surface of the segment, and is provided in the inner wall of the ring in the direction of the fixed bracket. The side portion includes an external gear that is rotatably fitted to an eccentric portion provided at the other end of the shaft, and an internal gear that meshes with the external gear and is attached to the fixed bracket. A motor incorporating a speed reduction mechanism provided with a speed reduction mechanism of a differential speed reduction mechanism in which the number of teeth of the external gear is slightly smaller than the number of teeth of the internal gear.