Patent ID: 6953011

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 provided for a discharge of 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, wherein a clean air path is provided that includes an air channel, a piston window and said at least one transfer channel, wherein said air channel serves for conveying essentially fuel-free air and, in prescribed positions of said piston, is fluidically connected via said piston window with said inlet window of said at least one transfer channel, wherein a direction of flow in said clean air path extends uniformly from an inlet into said cylinder to an outlet out of said piston window, in at least one position of said piston, and in a plane that extends perpendicular to a longitudinal axis of said cylinder, and wherein a width of said piston window, as measured in a circumferential direction, is 50 to 95% of a diameter of said piston.