Patent ID: 8225761
Filing Date: 2012-07-24
Classification: F01L,Y10T

Abstract:
1. A valve gear for an internal combustion engine provided with a camshaft that rotates in synchronism with revolution of the internal combustion engine, a drive cam that integrally rotates with the camshaft, a valve cam that rotates relative to the camshaft and opens and closes an engine valve, a link mechanism that transmits valve driving force of the drive cam to the valve cam, a holder member that supports a supporting shaft of the link mechanism and is oscillable around the camshaft, and a driving mechanism that varies a fulcrum position of the link mechanism by oscillating the holder member, a valve operating characteristic of opening and closing of the engine valve being made variable with a supporting shaft oscillating position of the link mechanism, the link mechanism comprising: a sub-rocker arm which oscillates pivoting on the supporting shaft the fulcrum; a pressing part operatively connected to the sub-rocker arm, said pressing part being provide for pressing a cam surface of the drive cam; a step disposed eccentrically in an axial direction of the camshaft; a link section for linking to the valve cam; a spring socket operatively connected to the step; and a return spring of the sub-rocker arm disposed intervening between the spring socket and the holder member.