Electric actuator and structure for fixing the same

DETAILED DESCRIPTION To attain the above objects, the present invention provides an electric actuator having inner component parts thereof inclusive of a motor covered by a cover main body.
The cover main body has a coating (protection) function and serves as a manually operating part, and is equipped with a mechanism for switching between electrical and manual operations.
In the electric actuator of the invention, the cover main body is cylindrical and is provided on a disk-shaped base body on which the inner component parts inclusive of the motor are mounted, and the cover main body is made of a synthetic resin and has an outer face formed integrally with a fastening curved face so that the cover main body is capable of being gripped.
In the electric actuator of the invention, the switching mechanism comprises a fastening pin, an apex of which is elastically energized outward in a lateral part of a base body, and a fastening groove of an annular projection disposed on an inner peripheral face of the cover main body, the apex being separably fastened to the fastening groove.
The annular projection is inserted into an annular groove formed in the lateral part of the base body to prevent the cover main body from being moved in a vertical direction relative to the base body.
In the electric actuator of the invention, the motor has a fastening projection, and the cover main body has a fastening depression formed on an inner peripheral face thereof, whereby an electrically operable state of the motor is established by causing the fastening projection to be engaged with the fastening depression and causing the apex of the fastening pin to be engaged with the fastening groove of the annular projection.
The fastening projection of the motor is fixed in the fastening depression formed on the inner peripheral face of the cover main body, and the apex of the fastening pin engaged with the fastening groove of the annular projection is depressed to cancel the state of engagement, thereby rendering the cover main body manually rotatable in conjunction with the motor and parts attached to the motor