Patent ID: 8381868

Claim:
An electric power steering system for use with a motor having an output shaft, the system comprising: a worm shaft that is coupled to the output shaft of the motor so as to be operated in accordance with the output shaft; a first rolling bearing and a second rolling bearing that rotatably support the worm shaft, the first rolling bearing being arranged at one end of the worm shaft near the motor, and the second rolling bearing being arranged at the other end of the worm shaft distant from the motor; a support member that supports the first rolling bearing and the second rolling bearing; a steering device; a worm wheel that is in mesh with the worm shaft, and that is coupled to the steering device; an urging member that urges the other end of the worm shaft toward the worm wheel; and a movement inhibitor that is arranged between an inner peripheral surface of the first rolling bearing and the worm shaft, the movement inhibitor including an elastic element, and allowing the worm shaft to move: (1) within a predetermined range in a radial direction of the worm shaft with respect to the first rolling bearing and (2) within a predetermined range in an axial direction of the worm shaft with respect to the first rolling bearing, wherein the movement inhibitor includes a metal inner ring and a metal outer ring, where the elastic element is: (1) positioned between the metal inner ring and the metal outer ring, (2) bonded to an outer peripheral surface of the inner ring and (2) bonded to an inner peripheral surface of the outer ring, and the first rolling bearing being arranged between an outer peripheral surface of the movement inhibitor and the support member.