Patent ID: 8689927
Filing Date: 2014-04-08
Classification: B62D,F16C

Abstract:
1. An electric power steering device comprising: a metallic housing; a steered shaft that is provided in the housing so as to be capable of reciprocating motion; an electric motor that is attached to the housing; a ball screw device that converts rotation of the electric motor into rectilinear motion of the steered shaft; a rolling bearing that rotatably supports the ball screw device on the housing; a plain bearing formed from a resin material that is provided between the housing and an outer ring of the rolling bearing; a first elastic element and a second elastic element that are provided at both ends of the rolling bearing in an axial direction and are respectively provided between both end surfaces of the outer ring in the axial direction and the housing; and at least two projecting portions provided on the plain bearing that project towards the outer ring, the projecting portions including a right projecting portion and a left projecting portion, wherein the right projecting portion is provided at a position of a maximum compression amount of the first elastic element that is away from a right end surface of the plain bearing and the left projecting portion is provided at a position of a maximum compression amount of the second elastic element that is away from a left end surface of the plain bearing.