| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator capable of compatibly achieving operability and positioning accuracy.SOLUTION: An actuator 1 includes a screw shaft 10 having a spiral rolling groove formed in an axial direction on an outer peripheral surface, and a nut 20 which has a rolling groove corresponding to the rolling groove and formed on an inner peripheral surface and is screwed into the screw shaft 10 via a plurality of rolling elements disposed in a rolling element rolling path formed of the rolling groove and the rolling groove in the screw shaft 10. The screw shaft 10 or the nut 20 functions as a direct-acting member 2 directly acting in an axial direction by relative rotation of the screw shaft 10 and the nut 20. The direct-acting member 2 (screw shaft 10) includes an elastic member 40 abutting on an opposite member 50. The elastic member 40 has a prescribed spring coefficient. |
