Patent ID: 6880503
Filing Date: 2005-04-19
Classification: F02B,F02F

Abstract:
1. A two-cycle engine, comprising: a cylinder; a combustion chamber formed in said cylinder; a reciprocating piston reciprocable in said cylinder; a connecting rod interconnecting said reciprocating piston and a crankshaft that is rotatably mounted in a crankcase, said crankcase being supplied with a fuel/air mixture that enters said crankcase via an inlet; an outlet in said combustion chamber for discharging exhaust gas from said combustion chamber; at least one transfer channel operable, in prescribed positions of said piston, to fluidly connect said crankcase with said combustion chamber; an inlet window formed in said cylinder via which said at least one transfer channel opens into said combustion chamber; an opening window formed in said cylinder via which said at least one transfer channel is communicated with said crankcase, said at least one transfer channel extending from said inlet window opening into said combustion chamber to said opening window opening into said crankcase; an air channel fluidly connectable with said inlet window of said at least one transfer channel for the flow of essentially fuel-free air into said at least one transfer channel, said air channel having an air channel window at one end thereof opening into said combustion chamber; and a piston window in said reciprocating piston operable, in prescribed positions of said piston, to fluidly connect said air channel with said at least one transfer channel, said at least one transfer channel having a constructive volume as measured along the extent of said at least one transfer channel between said inlet window that opens into said combustion chamber and said opening window that opens into said crankcase and said constructive volume of said at least one transfer channel being such that, at a rated speed, the volume of essentially fuel-free air that is introduced into said at least one transfer channel during an intake stroke ranges from at least 75% up to no more than 100% of the constructive volume of said at least one transfer channel.