| 摘要 |
PROBLEM TO BE SOLVED: To suppress an influence on component elements of a bearing and a ball screw even when a locking portion and a stopper portion collide with each other under a comparatively large load.SOLUTION: Two locking portions 61, 62 are separately disposed on positions different in phases by 180 degrees in the circumferential direction, of a nut 30 to which rotary motion is transmitted from a torque transmitting member 71 and which is rotatably supported by a bearing 40. Two stopper portions 51, 52 kept into contact with two locking portions, are separately disposed on positions different in phases by 180 degrees in the circumferential direction, of a screw shaft 20 where the motion is converted into the linear motion. |
