| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power steering device, which can suppress deformation of a screw groove of a nut.SOLUTION: A ball screw nut 61 is supported by a ball bearing 87 through a mounting member 70 in a manner freely rotating. The mounting member 70 has a lower rigidity compared to the rigidity of the ball screw nut 61 and the rigidity of the ball bearing 87. When the ball screw nut 61 is mounted to the ball bearing 87 through the mounting member 70, the right side face 66A of the body 66 is set as a top and the ball screw nut 61 is pressed into a small diameter part 71 from the side of a large diameter part 72 of the mounting member 70, and from the side of the small diameter 71 of the mounting member 70, an inner wheel 87A of the ball bearing 87 is pressed into the large diameter part 72. |
