JP2605317Y2 - Torque transmission device for motor with worm gear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque transmitting device for a motor with a worm gear that repeatedly starts and stops like a drive motor for opening and closing a window glass of an automobile.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for downsizing and opening / closing drive motors for automobile window glasses.

[0003] A conventional torque transmission device for a motor with a worm gear will be described below with reference to the drawings. FIG. 3 is a sectional view thereof.

In FIG. 3, when a worm gear 1 formed at one end of a motor shaft rotates, torque is transmitted to a worm wheel 2 meshing with the worm gear 1, and the worm wheel 2 is provided with a damper rubber 36 and a torque transmitting plate.
7, supported by the bearing portion 5a of the gear cover 4 via the output shaft 8 , and having the projection 2a on the end face and the support insertion hole 2 in the center.
It rotates while sliding with the gear case at b . The torque is transmitted to the torque transmission plate 7 via the damper rubber 36 and transmitted to the output shaft 8 fixed to the torque transmission plate 7. At this time, when the damper rubber 36 is restrained by the motor, the damper rubber 36 is compressed by the worm wheel 2 and the torque transmission plate 7 to form a shock absorber.

[0005]

However, when the damper rubber 36 is compressed, the damper rubber 36 is stretched in the gap between the worm wheel 2 and the axial direction of the output shaft 8, and as a result, the worm wheel and the gear cover are pressed down. There was a problem that the restraint torque was reduced due to an increase in load applied to the wheel and sliding resistance accompanying rotation.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a motor with a worm gear which suppresses an increase in sliding resistance due to compression of a damper rubber and improves torque.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve this object
The torque transmission device of the worm geared motor of the present invention
A worm gear formed at the end of the motor shaft and at right angles to the shaft
Are arranged in the direction of the rotation center axis of the
A support insertion hole in the center and between the outer circumference and the support insertion hole
And a plurality of ribs arranged in the circumferential direction at one end
A worm wheel having a convex portion on the surface;
The wheels are rotatably supported by bearings, and the worm
Rotate while the protrusion on the end face of the eel slides on the inner wall surface
The torque of the worm wheel and the worm wheel
-Engagement hole that engages the output shaft with the center transmitted through rubber
A torque transmission plate having
Damper rubber and torque transmitting plate
Transmission to the output shaft via the damper,
The rubber shape is a hollow cylindrical shape, and the worm wheel
And slits on both sides to engage the torque transmission plate
With one end face elastic and always in contact with the torque transmission plate.
A plurality of minute projections to be touched are provided.

[0008]

According to the present invention, the thickness of the damper rubber is made thinner than a predetermined thickness, and a plurality of minute projections are provided on one end surface of the output shaft even if the damper rubber is compressed. The tension in the direction can be reduced. Further, in the normal state of the damper rubber, since it is supported by a plurality of elastic fine projections, there is no problem such as backlash.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A torque transmission device for a motor with a worm gear according to an embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a worm gear formed on a motor shaft, and 2 denotes a worm gear which is disposed in the direction of a rotation center axis perpendicular to the motor shaft made of a synthetic resin meshing with the worm gear 1.
At the center, a support insertion hole at the center, and
A plurality of ribs circumferentially arranged between the support insertion holes
The worm wheel 3 has a gear case and is made of resin. 4 is a gear cover, which is made of an iron plate,
A bearing part 4 a is formed at the center and is fixed to the gear case 3. An output bearing 5 is press-fitted and fixed to the gear cover. 6 is a damper rubber, 7 is a torque transmission plate, and is fixed to an output shaft 8 supported by the output bearing 5 with a retaining ring 9.

FIG. 2 is an external perspective view of a damper rubber used in the torque transmitting device of the worm geared motor according to the present invention.

In FIG. 2, the damper rubber 6 has a hollow cylindrical shape, and 6a is a minute projection provided on one end face.
6b is a slit for engaging with the worm wheel 2 and the torque transmission plate 7.

The operation of the worm gear-equipped motor constructed as described above is the same as that of the conventional example and will not be described.

As described above, according to this embodiment, the output shaft is restrained by making the thickness of the damper rubber thinner than a predetermined thickness and providing a plurality of minute projections 6a on one end surface. Even in the case where the damper rubber 6 is compressed, the tension in the axial direction of the output shaft can be reduced by the gap between the initially provided damper rubber and the torque transmission plate.

In FIG. 2, the shape of the minute projection is a column, but may be spherical or conical.

[0016]

Obviously the present invention from the foregoing description of the invention] is the thickness of the damper rubber thinner than a predetermined thickness, thin
A small number of elastic small protrusions on one end face
Provided by the compression between the damper rubber and the torque transmission plate.
By providing a clearance to reduce the tension of the rubber
To increase the sliding resistance between the worm wheel and gear cover.
Control and high torque, damper rubber
The micro projections are elastic when the
Worms that prevent backlash due to constant contact with
Thus, it is possible to obtain a torque transmission device for a motor with a locker.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor with a worm gear according to an embodiment of the present invention;

FIG. 2 is a perspective view of a damper rubber according to an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional motor with a worm gear;

FIG. 4 is a perspective view of a conventional damper rubber.

[Explanation of symbols]

 Reference Signs List 2 worm wheel 4 gear cover 6 damper rubber 6a minute projection provided on damper rubber 7 torque transmission plate

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Masaki Nakanishi 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-230737 (JP, A) JP-A-56- 20828 (JP, A) JP-A-4-29542 (JP, A) JP-A-61-179337 (JP, U) JP-A-61-5720 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A worm gear formed at the end of a motor shaft, arranged in the direction of a rotation center axis perpendicular to the shaft, having a gear tooth at an outer periphery, a support insertion hole at a center portion, and a support insertion hole at an outer periphery. A plurality of ribs arranged in the circumferential direction between the worm wheel and a worm wheel having a convex portion on one end surface, and the worm wheel is rotatably supported by a bearing portion.
And the convex portion of the end surface of the worm wheel slides on the inner wall surface.
Comprising a Gyakesu rotating with the torque transmission plate having engaging hole for engaging the output shaft rotational force of the worm wheel in the center to transmit via the damper rubber, and said output shaft, rotation of the worm wheel In a structure in which force is transmitted to an output shaft via a damper rubber and a torque transmission plate, the shape of the damper rubber is a hollow cylindrical shape, and slits for engaging the worm wheel and the torque transmission plate are provided on both sides, and one side is provided. A torque transmission device for a motor with a worm gear having a plurality of minute projections having elasticity on an end face thereof and constantly contacting the torque transmission plate.