| 摘要 |
PURPOSE:To reduce blow-by loss of fresh air by supplying mixture forcibly sent to a scavenging path from a carbureter through to a crank chamber into a cylinder as scavenging flow separated into mixture having different fuel concentration through the scavenging path and a scavenging hole. CONSTITUTION:Mixture of air prepared by a carbureter and gasoline flows into a crank chamber 3 through an intake pipe 6. Here it receives turbulence and centrifugal force through a balancer 2, a crankshaft, etc. and is urged against the inner wall of the crank chamber 3. Then, fuel liquid drops, grains and the like in fuel flow into a sub-chamber 5 through a thin groove 4. Thus, rich mixture is formed in the sub-chamber 5 and lean mixture in the crank chamber 3. And while scavenging is carried out by the lean mixture, the rich mixture is supplied to a position remote from a scavenging hole to control blow-by of fuel. Thus, the blow-by loss of fresh air is reduced. |
