公开(公告)号：US20210061346A1

公开(公告)日：2021-03-04

申请号：US16611439

申请日：2017-06-29

Applicant: SHOWA CORPORATION

Inventor： Yukinari Sato ,  Takayuki Tetsuka ,  Shingo Ishige ,  Akira Shirakawa ,  Tsukasa Suzuki

IPC: B62D5/04 ,  F16F15/08 ,  F16C27/02

Abstract: A vehicle steering device includes a turning shaft held in a housing so as to be movable in the axial direction, a ball screw transmitting drive force produced by an electric motor to the turning shaft, a bearing supporting a nut, which is a component of the ball screw, so as to be rotatable relative to the housing, and annular elastic members that support side faces of the bearing in the axial direction of the turning shaft across the entire circumference, and are formed of an elastic material. The elastic members include respective first elastic portions having a first load characteristic that gently increases the ratio of compression load per a unit compression amount deforming in the axial direction of the turning shaft, and respective second elastic portions having a second load characteristic that keenly increases the ratio in comparison with the first load characteristic.