| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric actuator which is reduced in cost by reducing the number of part items, and improved in reliability by a whirl-stop mechanism which can suppress wear.SOLUTION: An electric actuator comprises: a whirl-stop ball 20 which extends to an axial direction at an internal periphery of a cylindrical bag hole 14 for accommodating a drive shaft 7 in a housing 2b, has a cross-section circular recessed groove 14a, and is engaged with the recessed groove; and a cage 21 attached to a screw shaft 15. A pocket 23 which penetrates a recess 15b of the screw shaft 15 while responding to the recessed groove 14a, and is formed into a large diameter larger than an outside diameter of the whirl-stop ball 20 is protrusively arranged, a cross-section circular guide groove 24 in which the whirl-stop ball 20 is rollingly accommodated, and which extends to an axial direction at an external periphery of the cage 21, and opposes the recessed groove 14a is formed, the whirl-stop ball 20 is held by the guide groove and the recessed groove 14a in a state that the ball has a clearance, and the screw shaft 15 is held so as to be non-rotatable and movable in an axial direction with respect to the housing 2b.SELECTED DRAWING: Figure 3 |
