Ventilsteuervorrichtung für einen Verbrennungskraftmotor

摘要

The control device, for intake and/or exhaust valves of an internal combustion engine, includes a small circumference portion 21b defined in a drive shaft 21 at a location corresponding to that of an annular member 29 which is eccentrically displaced for changing a rotational phase of the cams 26. Thus the degree of displacement of the annular member 29 may be increased and control of the cans 26, and thereby the engine valves may be enhanced. Further, the cam lobe of each cam 26 is formed such that side portions thereof are asymmetrical with respect to a center line of the cam for favorably affecting valve opening and closing timings. In addition, there is an improved lubricating arrangement for enhancing smooth operation and improved engine performance. <IMAGE>