Patent ID: 7455149
Filing Date: 2008-11-25
Classification: B62D,F16C,F16H,H02K,Y10T

Abstract:
1. A worm reduction gear comprising a worm wheel, a worm shaft and an elastic body, wherein the elastic body applies an elastic force to the worm shaft in a direction towards the worm wheel via a pre-load pad, and the worm wheel is fixed freely to an assist shaft, and one end portion of the worm shaft is supported by a first bearing, and the other end portion is supported by a second bearing, inside a gear housing, and a worm provided in an intermediate portion of the worm shaft meshes with the worm wheel, and is able to oscillate around the first bearing, and an outer peripheral face and at least part of both axial side faces of the second bearing are covered by a synthetic resin shock-absorbing member fixed to the gear housing, and axial displacement of the second bearing with respect to the shock-absorbing member is restricted, and axial displacement of the worm shaft with respect to the pre-load pad and the second bearing is permitted, and the shock-absorbing member has a pair of planar portions on an inner peripheral face thereof, and radial displacement of the second bearing with respect to the shock-absorbing member is permitted only a direction along the planar portions.