Patent ID: 6450056
Filing Date: 2002-09-17
Classification: F16D,F16H,H02K,Y10T

Abstract:
A motor having a speed reduction device comprising;a motor body having a motor shaft for generating a driving force; a speed reduction device having a gear housing, a worm shaft housed in the gear housing, the worm shaft being provided with a worm, a worm wheel housed in the gear housing and in mesh with the worm, and first and second bearings provided in the housing, axial inner surfaces of the first and second bearings being in contact with and holding rotatably the worm shaft on opposite sides of the worm; and a coupling device coupling an end of the motor shaft with an end of the worm shaft on a side of the first bearing for transmitting the driving force from the motor shaft via the worm shaft to the worm wheel, wherein, when the worm shaft is bent by an overload transmitted thereto via the worm wheel, the axial inner surface of the first bearing maintains an axially widespreading face contact with the worm shaft in at least one of a manner that, to follow the bending of the worm shaft, the first bearing inclines a given angle to a bending side of the worm shaft and a manner that the axial inner surface of the first bearing is formed in a shape of approximately following a bending shape of the worm shaft and actually comes in contact with the worm shaft at positions more extending axially toward the worm.