Patent ID: 9033096
Filing Date: 2015-05-19
Classification: B62D,F16C,F16H

Abstract:
1. A power steering device that assists a steering force applied to a steering wheel by a driver comprising: a worm wheel that is provided on a steering shaft linked to the steering wheel; a worm shaft that is engaged with the worm wheel and rotated by driving of an electric motor; a first bearing that rotatably supports a base-end side of the worm shaft; a second bearing that rotatably supports a tip-end side of the worm shaft; a gear case that houses the worm shaft; a biasing member that biases the worm shaft towards the worm wheel by exerting a biasing force on an outer circumferential surface of the second bearing; and an elastic member that is arranged between an inner circumferential surface of the gear case and the outer circumferential surface of the second bearing, wherein the inner circumferential surface of the gear case that surrounds the outer circumferential surface of the second bearing is formed such that the second bearing can move towards the worm wheel by the biasing force of the biasing member, and wherein the inner circumferential surface of the gear case is provided with a ring-like groove for housing the elastic member, and a center of the ring-like groove is provided so as to be offset towards the worm wheel side from a center axis of the worm shaft when the first bearing and the second bearing are in a coaxial state.