Patent ID: 7100553

Claim:
An actuator for a valve lift control device that controls valve lift of at least one of an intake valve and an exhaust valve of an internal combustion engine, the actuator linearly moving a control shaft in an axial direction of the control shaft to change the valve lift in accordance with a position of the control shaft in the axial direction of the control shaft, the actuator comprising: a first rotation cam and a second rotation cam that integrally rotate around a common rotation axis by transmission of torque; and a direct acting follower that includes a first contact member and a second contact member, wherein the first contact member is in contact with the first rotation cam via a first contact point, the second contact member is in contact with the second rotation cam via a second contact point, the direct acting follower linearly moves with the control shaft as the first rotation cam and the second rotation cam rotate, the first contact point is located on a substantially opposite side of the second contact point with respect to the common rotation axis, the first rotation cam has a first rotation cam lift at the first contact point, the second rotation cam has a second rotation cam lift at the second contact point, the first rotation cam lift and the second rotation cam lift have a sum thereof, and the sum of the first rotation cam lift and the second rotation cam lift is substantially constant in a predetermined rotation angular range of the first rotation cam and the second rotation cam.