| 摘要 |
PURPOSE: A muffler with a variable resonant chamber is provided to efficiently reduce exhaust noise within the entire range of engine operation by actively changing the volume of the resonant chamber and the sectional area of the inlet according to pressure of exhaust gas. CONSTITUTION: A muffler comprises a housing(21) formed at the side of an exhaust pipe(10); a resonant chamber(50) varying the volume in sliding front and rear walls(30,40) back and forth in the housing; a porous plate integrally formed with the front wall and composed of plural small holes(34) to transmit exhaust pressure through the exhaust pipe to the front wall; a return spring(70) applying force opposite to the porous plate to the front wall to increase the volume of the resonant chamber in lowering pressure of exhaust gas; and a neck(60) connecting the resonant chamber to the exhaust pipe, and varying the sectional area of the inlet with a throttle valve(61) according to volume of the resonant chamber.
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