MOTOR

摘要

A coupling portion is provided on either a rotary shaft or a worm shaft in an integrally rotational manner, said coupling portion for connecting the rotary shaft to the worm shaft and having a coupling hole therein. The coupling projection provided on the other of the rotary shaft and the worm shaft is inserted in the coupling hole. A circumferential clearance and a radial clearance are formed between the inner surface of the coupling hole and the coupling projection. Circumferential buffer portions are interposed in the circumferential clearance, and radial buffer portions are interposed in the radial clearance. The inner surface of the coupling hole and the coupling projection are arranged such that the circumferential buffer portions are compressed to deform in the circumferential direction whereby to allow the buffer portions to be brought into contact with each other when the rotary shaft is rotating.

主权项

1. A motor comprising:
a motor body having a rotary shaft; a speed reduction mechanism, which includes a worm shaft and a worm wheel meshed with the worm shaft; and a coupling portion, which has a coupling hole and couples the rotary shaft and the worm shaft with each other so that the rotary shaft the worm shaft are integrally rotational, wherein the coupling portion is provided to be rotational integrally with one of the rotary shaft and the worm shaft, a coupling projection is provided on the other one of the rotary shaft and the worm shaft, the coupling projection being inserted in the coupling hole, a circumferential clearance, which is a clearance in a circumferential direction, and a radial clearance, which is a clearance in a radial direction, are formed between an inner surface of the coupling hole and the coupling projection, a circumferential buffer portion is located in the circumferential clearance,
a radial buffer portion is located in the radial clearance, andthe inner surface of the coupling hole and the coupling projection are configured to be contactable with each other in the circumferential direction while compressing and deforming the circumferential buffer portion in the circumferential direction when the motor body is driven to rotate the rotary shaft.