Patent ID: 9550517
Date: 2017-01-24
CPC Classifications: B62D,F16H

Claim:
1. A rear wheel steering apparatus for a vehicle comprising: a housing that is connected via a first connecting member and a second connecting member to a suspension mechanism which supports rear wheels of a vehicle; an electric motor that is accommodated in the housing; a planetary gear mechanism that has a sun gear which is connected to an output shaft of the electric motor, a ring gear which is non-rotatably supported inside the housing, a planetary gear which meshes with the ring gear and the sun gear, and a carrier which is connected to the planetary gear, and reduces the output of the electric motor; and a linear motion mechanism that has a nut member which is connected to the planetary gear mechanism and forms the carrier, and a rod which is screwed to the nut member and is connected to the second connecting member, and converts the rotational motion of the nut member into the linear motion of the rod, wherein the planetary gear mechanism includes wherein in a state where the planetary gear is installed between the contact portion of the locking member and the nut member, the planetary gear is supported to be capable of rotating around the pin, wherein the locking member has a concave portion that supports the tip end portion of the pin, and wherein a plurality of protruding ridges are provided on an inner circumferential surface of the concave portion while being equally spaced along a circumference around the pin, with the protruding ridges extending in an axial direction of the pin, and protruding in a direction toward the axis of the pin.