Patent ID: 6463899
Filing Date: 2002-10-15
Classification: F01L,Y10T

Abstract:
A valve operating system in an internal combustion engine including a cylindrical swinging support section provided at a base end of a rocker arm and swingably carried on a rocker shaft mounted in a cylinder head, a plurality of valve abutments provided at a tip end of said rocker arm and capable of being individually put into abutment against upper ends of a plurality of engine valves, and a cam abutment provided on said rocker arm in an intermediate portion between said swinging support section and each of said valve abutments to come into contact with a valve operating cam, wherein said swinging support section includes a thinner cylindrical portion surrounding said rocker shaft, and thicker cylindrical portions which are each formed of a thickness larger than that of said thinner cylindrical portion into a cylindrical shape to surround said rocker shaft and which are integrally and continuously provided at axially opposite ends of said thinner cylindrical portion, respectively, said thicker cylindrical portions having grooves provided in their inner surfaces respectively and capable of accumulating an oil between said inner surfaces and an outer surface of said rocker shaft.