Valve gear for internal combustion engine

Abstract

The present inventio relates to a valve gear for an internal combustion engine. The internal combustion engine has one or more cylinders and a piston reciprocating therein as well as a cylinder head mounted on an upper end of the cylinder. At least one exhaust valve opening into an exhaust channel and at least one suction valve opening into a suction channel are arranged in each cylinder. The valves are operated by transmission of a cam shaft or the like. In accordance with the present invention, the size of a combustion space of the cylinders is adapted to be changed in a force-controlled manner periodically during one crankshaft revolution by way of a movable sleeve fitted around at least one valve. This sleeve is arranged, together with the valve, to penetrate into the combustion space for reducing the combustion space. The sleeve or sleeves can be arranged around the suction valve or valves and/or around the exhaust valve or valves.

Dependencies are inferred from the claim text.