Patent ID: 6173683
Filing Date: 2001-01-16
Classification: F02B,F02M

Abstract:
A two cycle stroke engine comprising a crank chamber in a crankcase into which a fuel mixture is supplied through an intake port, a combustion chamber in a cylinder, scavenging ports in said cylinder for communication between said combustion chamber and said crank chamber, an exhaust port in said cylinder, a piston having an outer surface and being adapted to increase or decrease the volume of said combustion chamber as it reciprocates in said cylinder and open or close said scavenging ports and said exhaust port, a communication groove formed on the piston's outer surface for communicating said exhaust port with said scavenging ports when said piston is in its pre-selected stroke position where said scavenging ports and said exhaust port are closed by said piston, and a circumferentially extending channel formed in the inner wall of said cylinder and adapted to communicate with said groove whereby when said piston reaches its pre-selected stroke position, said communication groove and said channel face each other to define a continuous passageway opening into said exhaust port and said scavenging port.