Thermal petrol engine e.g. four-stroke thermal petrol engine, for automobile, has semi-chambers sliding without contacting one another in vicinity of top point to define semi-chambers together to form closed volume

摘要

The engine has a cylinder closed by a cylinder head (1). A central combustion chamber (10) has a central semi-chamber (4) fixed in the head and another central semi-chamber fixed in a piston (2), where the semi-chambers slide without contacting one another in a vicinity of a dead top point to define the semi-chambers together by a track (8) made of steel to form a closed volume, so that an application surface of pressure of combustion gases on the piston is limited and a connecting rod assembly is relived, where the volume is isolated from rest of the combustion chamber.