| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric linear actuator which is simple in structure, low in cost and has a whirl-stop mechanism of a screw shaft.SOLUTION: In an electric actuator 1 having a screw shaft 10 in which a spiral screw groove 10a is formed at its external periphery, a steel sleeve 17 is fastened to a bag hole 12 of a housing 2b via a screw part 17b, a recessed groove 17a which axially extends and whose cross section is substantially circular is formed at an internal periphery of the sleeve 17, a guide ball 15 is locked to an end of the screw shaft 10, and engaged with the recessed groove 17a, a radius curvature R1 of the recessed groove 17a is set as R1≤1.2Ra, where a radius of the guide ball 15 is Ra, and the screw shaft 10 is support to the housing 2b so as to be non-rotatable and axially movable. |
