| 摘要 |
PROBLEM TO BE SOLVED: To promote to miniaturize and reduce the weight of an electrical actuator, and to improve the accuracy related to the control of speed and positioning, and to improve the response speed. SOLUTION: A screw axis 10 is not rotatably secured to a case 9, then the support rigidity and securing rigidity of the screw axis 10 can be easily improved. A projection 12d of a mover 12 and a guide rail 13a of a sleeve 13 are 'engaged incapable of rotating with each other and moreover slidable in the axial direction'. The rotational drive of the sleeve 13 makes a nut 11 move toward the axis direction of the screw axis 10, while rotating. The motion of a nut 11 makes a reciprocating shaft 16 move straight, along the screw axis 10 and produce an axial thrust. In this case, since a projection 12d of the mover 12 can slide in the axial direction for the guide rail 13a of the sleeve 13, the nut 11 and the mover 12 are not be prevented from moving toward the axial direction, and the sleeve 13 will not be subjected to axial load.
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