Patent ID: 7699030

Claim:
A variable valve system of an internal combustion engine having a cam operatively connected to a cam shaft, a rocker arm rocked by the action of a valve driving force of the cam, a lift quantity variable mechanism that varies maximum lift quantity of an engine valve and an actuator that drives the lift quantity variable mechanism wherein the cam opens and closes the engine valve via the rocker arm, comprising: a lifter operatively connected to the lift quantity variable mechanism, said lifter being driven by the cam for applying the valve driving force to the rocker arm; and a lifter holder for supporting the lifter, said lifter holder being driven by the actuator and rocked; wherein the maximum lift quantity is varied by varying a position in which the lifter abuts on a concave abutting part of the rocker arm according to a position of the lifter holder, wherein the camshaft is rotatably supported by a cam holder via the lifter holder rockably supported by the camshaft.