Patent ID: 7886630
Filing Date: 2011-02-15
Classification: B62D,Y10T

Abstract:
1. An electric steering device comprising: a steering shaft of which a vehicular-rear side is capable of mounting a steering wheel; a column that pivotably supports the steering shaft, the column allowing adjustment of a tilting position on a fulcrum of a tilting center axis or of a telescopic position along a center axial line of the steering shaft; an electric actuator attached to the column; a feeding screw shaft that is pivotably supported on the column so as to be rotated by the electric actuator and has a screw segment on an outer circumferential surface thereof; a nut that is screwed on the screw segment of the feeding screw shaft, and converts a rotation of the feeding screw shaft into a linear motion to transmit the linear motion as a tilting motion or telescopic motion of the column; and buffers each of which abuts on the nut at moving ends of the linear motion of the nut to buffer an impact force when the nut stops at the moving end, wherein the buffer is formed in a hollow disk shape, wherein an inner hole of the buffer is fit on the outer circumferential surface of the feeding screw shaft; wherein the feeding screw shaft includes a small-diameter shaft segment formed at an end of the feeding screw shaft, that is smaller in diameter than the screw segment of the feeding screw shaft and wherein the inner hole of the buffer is an inclined hole, and an edge of the inclined hole contacts the outer circumferential surface of the small-diameter shaft segment.