Patent ID: 6851508
Filing Date: 2005-02-08
Classification: B62D,F16C

Abstract:
1. An electrically driven power steering apparatus comprising: a housing; a ball screw shaft extending within said housing and connected to a steering mechanism; an input shaft to which a steering force is inputted; an output shaft for receiving the steering force from said input shaft and outputting the steering force to said ball screw shaft; a torque sensor for detecting a torque transferred between said input shaft and said output shaft; a motor including a rotor; and ball screw nut for giving a force in an axial direction to said ball screw shaft by receiving a rotational force from said motor, wherein said ball screw shaft is supported by the nut only, and wherein a deformable elastic member capable of absorbing an impact inputted from the side of said ball screw shaft, is disposed on a power transmission route between said ball screw shaft and said rotor of said motor, and wherein said ball screw nut is displaced only in a rotational direction, in accordance with the elastic deformation of said elastic member.