Patent ID: 7234425

Claim:
An actuator for a valve lift controller controlling a lift amount of an intake valve and/or an exhaust valve, the actuator linearly driving a control shaft of a changing mechanism changing the lift amount according to a position thereof in an axial direction of the control shaft, comprising: a feed screw mechanism including: a screwed shaft which moves linearly along with the control shaft; and a rotation spindle which is arranged coaxially with the screwed shaft and rotates, the feed screw mechanism converting a rotational movement of the rotation spindle into a linear movement of the screwed shaft; a motor unit for rotating the rotation spindle by receiving electric power; a bearing including an inner race attached to the rotation spindle, the bearing supporting the rotation spindle against a radial force applied to the rotation spindle; an electric power distributor located at an opposite side of the feed screw mechanism relative to the changing mechanism, the electric power distributor providing the electric power to the motor unit; a stopper member for directly or indirectly engaging with an outer race of the bearing in a direction from the electric power distributor to the outer race to restrict a movement of the bearing in the axial direction.