Valve operating device of internal combustion engine

摘要

A valve operating device of an internal combustion engine, including a plurality of cams 3,5 on a camshaft 2 having different cam profiles corresponding to operating conditions of the engine for opening and closing an intake valve according to the operating conditions of the engine. A high-speed cam 5 has a cam lobe 5b which projects from a base circle portion 5a of the cam by a distance d2 smaller than the distance d1 by which the cam lobe 3b of a low-speed cam 3 projects from the base circle portion 3a. The cam lobe of the high-speed cam also subtends a larger angle on the base circle of the camshaft than the cam lobe of the low-speed cam.