Muffler with a scavenging effect

A muffler with a gas-scavenging effect, which is disposed close to the atmospheric discharge end of an exhaust pipe in which exhaust discharged from a combustion chamber flows to accelerate the flow velocity of the exhaust gas flow, and promote displacement of the exhaust gas in the combustion chamber with new charge using negative pressure generated in association of the acceleration, wherein a flow-distributing chamber (2) that distributes the exhaust gas flow, having a flow cross-section area expanded so that it is larger than the flow cross-section area for said exhaust pipe (1) is connected at its front end with a center exhaust port (3) formed at the center of the flow-distributing chamber (2);

• its rear portion forms an accelerator (4) with its flow cross-section area reduced to accelerate the exhaust gas flow flowing therein and make it a high-velocity gas flow;
• a negative pressure generator (6) is disposed which has a negative pressure chamber (5) with a flow cross-section area expanded so that it is larger than that in the accelerator (4), downstream thereof, and a bypass (9) is disposed to suck the exhaust gas flow in an outer layer from the flow-distributing chamber (2), into the negative pressure chamber (5) through flow-distributing holes (7) opened to the flow-distributing chamber (2), and sucking holes (8) opened to the negative pressure chamber (5);
• and a silencing part (19) is disposed between said negative pressure chamber (5) and the flow-distributing chamber (2).