Patent ID: 9630647
Date: 2017-04-25
CPC Classifications: B62D,F16H

Claim:
1. An electric power steering system comprising: an electric motor having a rotary shaft; a speed reducer that includes a worm shaft having a first end portion and a second end portion, and a worm wheel that meshes with the worm shaft; a joint that includes a rotational element that has a boss into which the first end portion of the worm shaft is press-fitted and a flange extending radially from the boss, the joint connecting the first end portion of the worm shaft with the rotary shaft so that torque is transmittable between the first end portion of the worm shaft and the rotary shaft; a housing that houses the speed reducer; a bearing that is held by the housing and supports the first end portion of the worm shaft so that the first end portion of the worm shaft is rotatable and movable in an axial direction; an elastic body that is interposed between an inner ring of the bearing and the flange of the rotational element, and urges the worm shaft in the axial direction toward the electric motor through the rotational element; and a receiving plate that is disposed along the same axis as the flange and directly contacts the elastic body and directly contacts the flange, wherein the flange has an outer diameter that is larger than an outer diameter of the receiving plate such that the outermost surface of the flange extends a distance farther from the axis than the outermost surface of the receiving plate extends from the axis.