Patent ID: 6863038
Filing Date: 2005-03-08
Classification: F01L

Abstract:
1. A valve driving apparatus comprising a cam, with a cam surface being formed so that a cam height and a cam operation angle continuously change, constituted to be rotated integrally with a camshaft and slidable in an axial direction thereof, and a valve lifter pressed by the cam surface of said cam to advance and retreat a valve via a shim, so that continuously variable control of a valve lift amount and a valve actuated angle is performed by said cam sliding in the axial direction of the camshaft, wherein said cam is provided with a shim attaching and detaching surface formed at said cam independently from the cam surface with a clearance being secured between said valve lifter and a shim of the valve to make the shim attachable and detachable from the clearance and the shim attaching and detaching surface has a sectional portion with a smaller diameter than a base circle of the cam surface.