Patent ID: 7401678

Claim:
An electric power steering system which transmits power of an electric motor for assisting a steering to a steering mechanism via a transmission device that includes a drive gear and a driven gear in mesh with the drive gear, the electric power steering system comprising: a bearing that rotatably supports an end of the drive gear in an axial direction thereof; a housing that includes a support hole for supporting the bearing in such a manner to be deviated in a direction in which a distance between an axial center of drive gear and an axial center of the driven gear varies; a first urging member that elastically urges the drive gear via the bearing in a direction in which the distance between the axial centers of the drive gear and the driven gear is shortened; and a second urging member that includes a plurality of elastic pins arranged in a circumferential direction of the bearing for elastically urging the bearing in the axial direction.