Patent ID: 8495924

Claim:
An electric actuator comprising: a body extending along an axial direction; a driving section driven rotatably under supply of an electric current thereto; a drive force transmission mechanism connected to the driving section for transmitting a drive force from the driving section; a displacement mechanism disposed on the body and including a screw shaft, which is rotatably displaced by the drive force transmitted through the drive force transmission mechanism, and a displacement member, which is screw-engaged with the screw shaft and displaced along an axial direction of the body; a connecting member coupled to one end of the screw shaft and connected to the drive force transmission mechanism by being rotatably supported by first and second bearings; a support mechanism for supporting the screw shaft in a radial direction; and a rotation regulating mechanism formed separate and detachable from the displacement member and fitted onto an outer circumferential surface of the displacement member, which is engaged in a groove of the body and regulates rotational displacement of the displacement member, the rotation regulating mechanism including a ring-shaped base portion and plural pairs of projections that project from the ring-shaped base portion along the axial direction to extend from the ring-shaped base portion along the axial direction, each projection including a first section contacting the ring-shaped base portion and a second section projecting along the axial direction beyond the ring-shaped base portion, wherein the support mechanism is disposed on an end of the screw shaft opposite to the end of the screw shaft to which the connecting member is coupled.