Patent ID: 7478574

Claim:
An electric actuator comprising: a motor casing; a gear casing detachably connected to the motor casing; a motor shaft extending in an axial hole along an axis in the motor casing and the gear casing and the motor shaft having a worm in the gear casing; a rotor fixed to the motor shaft to rotate therewith; a stator fixed on an inner circumferential surface in the motor casing; a ball bearing in an enlarged axial hole partially formed of the axial hole to support the motor shaft rotatably, said ball bearing having an inner race and an outer race; and a collar made of an elastic rubber ring pressingly fitted on the motor shaft to apply pressure onto the inner race of the ball bearing axially, and the collar having a trapezoidal transverse cross-section such that the collar gradually increases in width as the collar extends toward an axis of the motor shaft.