Actuator device and variable valve apparatus of internal combustion engine

摘要

There is provided an actuator device for a variable valve apparatus. The variable valve apparatus has a control shaft to vary operation characteristics of an engine valve by an axial movement thereof. The actuator device has a rotatable screw shaft, a movable member axially movable with rotation of the screw shaft and a transmission mechanism unit that converts an axial movement of the movable member to the axial movement of the control shaft. An amount of the axial movement of the movable member is larger than an amount of the axial movement of the control shaft.