Patent ID: 6289856
Filing Date: 2001-09-18
Classification: F02B,F02F

Abstract:
A stratified scavenging two-cycle engine including a cylinder block having a cylinder chamber therein, said cylinder block having a sidewall which at least partially defines said cylinder chamber, said sidewall having therein an air intake port, at least one scavenging port, and an exhaust port,a mixture intake port for communication with a crank chamber, andat least one scavenging flow passage for connecting the cylinder chamber to the crank chamber,wherein each scavenging port is an opening in said sidewall at a first position,wherein the air intake port is an opening in said sidewall at a second position which is a predetermined distance away from said first position toward the crank chamber parallel to an axial direction of said cylinder chamber in said cylinder block such that a position of a piston at which said air intake port is opened by movement of said piston is lower than a position of said piston at which said at least one scavenging port is opened by movement of said piston, andwherein the at least one scavenging port is connected to the air intake port through a piston to thereby supply air from the air intake port opening in said sidewall via the piston to and through each scavenging port opening to a scavenging flow passage at the time of an intake stroke.