Patent ID: 8286597
Filing Date: 2012-10-16
Classification: F01B,F02B,F02D,F02P,Y02T

Abstract:
1. A piston engine having a main cylinder, an auxiliary cylinder fitted outside the main cylinder, and a slidable valve, the engine being characterized by: the auxiliary cylinder having an opening; the opening communicating with a main combustion chamber; a connecting passage in vicinity of a top dead center, the connecting passage connecting the main combustion chamber and the opening; a valve body of the slidable valve fitted in the auxiliary cylinder and slidable axially of the auxiliary cylinder; the slidable valve body having a cylindrical side surface; the slidable valve body having a cavity formed therein; a first compression ring and a second compression ring both fitted on the cylindrical side surface; the cavity having a port formed in another part of the cylindrical side surface than the part of the cylindrical side surface that lies between the two compression rings, the port being adjacent to the main combustion chamber; an actuator for shifting the slidable valve body axially of the auxiliary cylinder; the main combustion chamber and the cavity adapted to be isolated from each other when the actuator shifts the slidable valve body to a position where the part of the cylindrical side surface that lies between the two compression rings faces the cylinder opening; the two compression rings adapted to seal combustion gas within the main combustion chamber to keep the combustion gas from flowing into the auxiliary cylinder when the cylindrical side surface between the two compression rings is aligned with the opening of the auxiliary cylinder; the main combustion chamber and the cavity adapted to communicate with each other when the actuator shifts the slidable valve body to a position where the cavity port faces the cylinder opening; and the valve body, the two compression rings, the cavity, and the actuator adapted to be an elements of the slidable valve.