| 摘要 |
PCT No. PCT/GB96/02717 Sec. 371 Date May 1, 1998 Sec. 102(e) Date May 1, 1998 PCT Filed Nov. 6, 1996 PCT Pub. No. WO97/17531 PCT Pub. Date May 15, 1997The present invention provides, with reference to the figure, a noise attenuator for an induction system or an exhaust system comprising a housing (10) having a gas inlet (13), a gas outlet (11) and a first gas flow passage (12) inside the housing connecting the gas inlet (13) to the gas outlet (11). A quarter wave resonator tube (14; 16; 23; 29) is provided inside the housing (10) which opens on to the first gas flow passage. The noise attenuator is an integer which can be installed as a single integrated unit in the induction system or the exhaust system. A Helmholtz resonator (21; 27) is provided inside the housing (10) which opens on to the first gas flow passage (12).
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