Patent ID: 7387096

Claim:
A lift-variable valve-operating system for an internal combustion engine, comprising: a subsidiary cam swingably carried on a movable support shaft that is displaceable in a plane perpendicular to a rotational axis of a valve-operating cam and which swing follows the valve-operating cam; a cam follower operatively connected to an engine valve and which is operated to follow the subsidiary cam, wherein a lift amount of the engine valve is varied by displacing the movable support shaft, a control arm connected to the movable support shaft and which is turnable about an axis parallel to the rotational axis of the valve-operating cam; and drive means for turnably driving the control arm, wherein the subsidiary cam is provided with an abutment face, wherein the abutment face of the subsidiary cam abuts against the cam follower, and includes a lift portion for turnably driving the cam follower; and a base circle portion connected to the lift portion and equally spaced apart from the axis of the movable support shaft to retain the cam follower in a rest state, and wherein the control arm includes webs disposed on opposite sides of the engine valve, and a connecting portion which interconnects leading ends of the webs.