초록 ▼

A rotatable cam and pivotally mounted rocker arm are employed for each valve of an internal combustion engine. The rocker arm has a working or cam follower surface thereon which includes a straight section and a curved section. By relatively moving the cam and rocker arm so that the cam acts against

A rotatable cam and pivotally mounted rocker arm are employed for each valve of an internal combustion engine. The rocker arm has a working or cam follower surface thereon which includes a straight section and a curved section. By relatively moving the cam and rocker arm so that the cam acts against appropriate portions of the cam follower surface, the moment of valve opening and closing is controlled, as well as the lift and duration of valve opening. The invention makes possible what is herein termed a five-cycle operation in that the following sequence can be achieved: (1) intake, (2) decompression, (3) compression, (4) power, and (5) exhaust.

대표청구항 ▼

Apparatus for operating a valve of an internal combustion engine having a reciprocable valve member for opening and closing a valve port in communication with a combustion chamber of the engine, the apparatus comprising a rocker arm, means mounting one end of said rocker arm for pivotal movement abo

Apparatus for operating a valve of an internal combustion engine having a reciprocable valve member for opening and closing a valve port in communication with a combustion chamber of the engine, the apparatus comprising a rocker arm, means mounting one end of said rocker arm for pivotal movement about a fixed axis so that the other end of said rocker arm acts against said valve member, a camshaft, a cam on said camshaft engageable with said rocker arm, and means for shifting said camshaft relative to said fixed axis so that said cam is engageable with various longitudinal portions of said rocker arm between its said other end and its said one end, said shifting means including bearing means for rotatably supporting said camshaft and means threadedly engaging said bearing means for moving said bearing means to effect said shifting of said camshaft relative to said axis.