Patent ID: 8506169
Filing Date: 2013-08-13
Classification: B62D,F16C,F16H

Abstract:
1. A bush bearing for rotatably supporting a rotating shaft portion of an end portion of a driving gear which meshes via a meshing portion with a driven gear of a transmission for transmitting the power of an electric motor for steering assistance to a steering mechanism in an electric power steering system, comprising: a bearing body having an inner peripheral surface which is brought into rotatable contact with a cylindrical outer peripheral surface of said rotating shaft portion; at least one first groove and at least one second groove provided on an outer peripheral surface of said bearing body so as to extend in a first direction about an axis of said rotating shaft portion; a first elastic ring member fitted in said at least one first groove and having a first projecting portion partially projecting radially outward from the outer peripheral surface of said bearing body on a meshing portion side in a second direction which is perpendicular to the axis of said rotating shaft portion and is toward the meshing portion and a first portion not projecting radially outward from the outer peripheral surface of said bearing body on an opposite side to the meshing portion side in the second direction; and a second elastic ring member fitted in said at least one second groove and having a second projecting portion partially projecting radially outward from the outer peripheral surface of said bearing body on the opposite side and a second portion not projecting radially outward from the outer peripheral surface of said bearing body on the meshing portion side.