| 摘要 |
<p>A muffler includes an upstream outer shell (202) a downstream outer shell (204) and identical upstream and downstream inner baffles (206,208) forming in combination an upstream expansion chamber, an inner expansion chamber (212) and a downstream expansion chamber (214). The upstream and downstream inner baffles divide the inner expansion chamber therebetween into a main chamber (216) downstream inner baffles divide the inner expansion chamber therebetween into a main chamber (216) and first and second laterally spaced subchambers (218,220). The upstream and downstream inner baffles have respective sets of apertures (222,224) therethrough laterally offset from each other and aligned with respective subchambers and communicating exhaust from the upstream expansion chamber through the set of apertures in the upstream inner baffle into the first subchamber and then flowing laterally through the main chamber to the second subchamber and then flowing through the second set of apertures into the downstream expansion chamber. Each of the upstream and downstream inner baffles has a second set of apertures (282,286) and drawn portions (284) providing an oppositely directed bypass flow passage relieving backpressure. <IMAGE></p> |
