VALVE DRIVING APPARATUS FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE: A Valve driving apparatus for an internal combustion engine is provided to use a direct driving type valve lifter which can be miniaturized and light-weighted while maintaining a sufficient lift amount of a valve in a restricted space to improve the operation efficiency. CONSTITUTION: In a valve driving apparatus using a direct driving type valve lifter which is disposed between a cam formed at a cam shaft and a poppet valve(105), the valve(105) is provided in a path formed at the cylinder head(111) of an internal combustion engine and moves to the axial direction of the valve to open and close the path. A guide hole(123) is formed at the cylinder head. A direct driving type valve lifter having a tappet portion(103) is brought in contact with the cam and pressed by the cam (102). A guide portion (104) having one end portion is coupled to the tappet portion(103) and housed within the guide hole(123) so as to slide freely therein to the axial direction of the poppet valve(105) in an interlocked manner as a pushing operation of the tappet portion by the cam, wherein the diameter of the guide portion(104) is formed to be smaller than the diameter of the tappet portion(103).