Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1976-07-26
1980-03-11
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181268, 181272, 181273, 181275, F01N 108, F01N 102
Patent
active
041924010
ABSTRACT:
A muffler for reducing the audible noise level of exhaust gases emitted by combustion engines has an inlet tube with a patch of louvers or perforations and is arranged so that all or substantially all the gas flowing through the muffler is forced through the patch into an expansion chamber from which it flows by either cross bleeding through a patch of louvers or perforations into an outlet tube or to a chamber opening into the inlet end of the outlet tube. A "splitter" partition may be used to control flow through the louvers and provide additional attenuation. An imperforate portion of the inlet tube is used as a driven tuning tube with a resonator chamber to form a Helmholtz low frequency attenuation system, the performance of which may be improved in some cases by use of an orifice in a wall of the resonator. Also disclosed is a muffler in which all the gas flows through a louver patch in the outlet tube and an imperforate part of the outlet tube is used as a part of an aspirating type Helmholtz system.
REFERENCES:
patent: 2661073 (1953-12-01), Deremeo
patent: 2960179 (1960-11-01), Bryant
patent: 3036655 (1962-05-01), Powers
patent: 3283847 (1966-11-01), Kerns et al.
patent: 3589469 (1971-06-01), Hasui et al.
patent: 3741336 (1973-06-01), Malash
patent: 3945460 (1976-03-01), McMillan
patent: 4111279 (1978-09-01), Sterrett
Deaver Don A.
Sterrett Dale E.
Fuller Benjamin R.
Hix L. T,.
Tenneco Inc.
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