Patent ID: 6874455

Claim:
A two-cycle engine, comprising: a cylinder in which is formed a combustion chamber that is delimited by a reciprocating piston that, via a connecting rod, drives a crankshaft that is rotatably mounted in a crankcase, wherein an inlet is provided for a supply of fuel/air mixture into said crankcase, wherein an outlet is disposed approximately opposite said inlet for exhaust gas from said combustion chamber, wherein at least one transfer channel is provided for fluidically connecting said crankcase with said combustion chamber in prescribed positions of said piston, wherein said at least one transfer channel opens into said combustion chamber via an inlet window, and opens into said crankcase via an outlet window wherein said at least one transfer channel has a rising section that extends approximately parallel to a longitudinal axis of said cylinder, and an inlet section into said combustion chamber, wherein an air channel is provided for conveying air that is essentially free of fuel, wherein in prescribed positions of said piston said air channel is fluidically connected via a piston window with said inlet window of said at least one transfer channel, wherein said at least one transfer channel has a flow resistance therethrough in a direction of flow from said crankcase to said combustion chamber that corresponds approximately to a flow resistance therethrough in a direction of flow from said combustion chamber to said crankcase, and wherein a ratio of a width of said at least one transfer channel as measured in a circumferential direction, to a height of said at least one transfer channel, as measured perpendicular to said width and to a direction of flow, is approximately constant over a length of said at least one transfer channel.