Patent ID: 7246579

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 of the control shaft in an axial direction thereof, comprising: a case forming a first space and a second space therein, the first space being supplied with lubricating fluid; a feed screw mechanism including: a rotation spindle which has a shape of a cylinder and includes a first end portion and a second end portion, the first end portion connecting the first space with an interior space of the rotation spindle, the second end portion separating in the second space the second space from the interior space; a screwed shaft which is located straddling borders between the interior space, the first spaces, and an external space of the case, the feed screw mechanism converting a rotational movement of the rotation spindle to a linear movement of the screwed shaft; a motor unit including a coil located in the second space, the motor unit rotating the rotation spindle when the coil is excited; and a sealing member sealing a gap between the case and the rotation spindle to separate the first space and the second space.