Patent ID: 7096834
Filing Date: 2006-08-29
Classification: F02B

Abstract:
1. A two-cycle combustion engine which comprises: at least one scavenging passage communicating between a combustion chamber and a crank chamber separated by a piston; a fuel supply device having a valve for adjusting a cross-sectional area of an air/fuel mixture supply passage thereof; an air/fuel mixture passage connected to and downstream from the fuel supply device for introducing an air/fuel mixture from the fuel supply device to the crank chamber; and a branch passage ramified off from the air/fuel mixture passage for supplying a lean air/fuel mixture, which is lean as compared with the air/fuel mixture in the air/fuel mixture passage, into the scavenging passage; wherein during an intake stroke of the engine, the lean air/fuel mixture from the branch passage is introduced into the scavenging passage and the air/fuel mixture is introduced from the air/fuel mixture passage into the crank chamber; and wherein during a scavenging stroke of the engines the lean air/fuel mixture is supplied from the scavenging passage into the combustion chamber prior to introduction of the air/fuel mixture within the crank chamber into the combustion chamber through the scavenging passage.