Patent ID: 7363888
Filing Date: 2008-04-29
Classification: F02B

Abstract:
1. A two-stroke engine comprising: a cylinder having a cylinder bore; a piston reciprocatingly arranged in the cylinder bore and delimiting together with the cylinder bore a combustion chamber, wherein the piston has at least one piston recess; a crankcase connected to the cylinder; a crankshaft rotatably arranged in the crankcase; a connecting rod connected to the piston and to the crankshaft, wherein the piston drives the crankshaft via the connecting rod; at least two transfer channels connecting the crankcase to the combustion chamber in pre-defined piston positions of the piston; the at least two transfer channels each having a transfer port opening into the combustion chamber; a device supplying fuel; an air channel supplying combustion air, wherein in predetermined piston positions of the piston, the air channel is connected by the at least one piston recess to the transfer ports of the at least two transfer channels; an exhaust exhausting exhaust gases generated in the combustion chamber; wherein the air channel, the at least one piston recess, and the at least two transfer channels communicating with the at least one piston recess define an air passage; wherein the air passage is configured to provide an approximately uniform distribution of air from the air channel into the at least two transfer channels communicating with the at least one piston recess, wherein the air channel opens into the cylinder bore such that a flow direction of the airflowing from the air channel into the at least one piston recess is directed against a ceiling of the at least one piston recess, wherein the flow direction of the air flowing into the at least one piston recess against the ceiling of the at least one piston recess is oriented at an angle of less than 90 degrees relative to a longitudinal axis of the cylinder.