Patent ID: 7665430
Filing Date: 2010-02-23
Classification: F02B

Abstract:
1. A stratified scavenging two-stroke cycle engine, comprising: a cylinder having an exhaust port and scavenge ports opening into a combustion chamber, a mixture inlet port for sucking a mixture into a crank chamber when a piston moves upward toward a top dead center, and scavenging passages connecting the crank chamber to the scavenge ports; a flange part, formed on a side of the cylinder, having an air supply chamber and a mixture passage; a passage connecting member, attached to the flange part, having an air flow passage connected to the air supply chamber and a mixture flow passage connected to the mixture passage in the flange part of the cylinder; a gasket located between the passage connecting member and the flange part of the cylinder; an integrated leaf valve formed with the gasket for allowing air in the air flow passage of the passage connecting member to flown, in only one direction, toward the air supply chamber in the flange part of the cylinder such that the gasket functions as both the gasket and a check valve; and a protrusion, formed in the air supply chamber of the flange part of the cylinder such that a surface of the protrusion facing the integrated leaf valve serves as a stopper for the integrated leaf valve, that limits bending of the integrated leaf valve when the integrated leaf valve is bent toward the air supply chamber by a pressure difference produced between the air flow passage in the passage connector member and the air supply chamber in the flange part of the cylinder.