Exhaust duct part in particular for an internal combustion engin

Details Exhaust duct part in particular for an internal combustion engin Exhaust duct part in particular for an internal combustion engin

1988-09-09

1991-02-19

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181252, 181258, 181180, F01N 124, F01N 708

Patent

active

049935127

ABSTRACT:
An exhaust duct part for the outflow of a fluid, in particular for the outflow of the exhaust gases of an internal combustion engine, includes a continuous external casing of substantially constant cross-section and containing at least one acoustic attenuation unit positioned longitudinally in the external casing so as to delimit at least one fluid transfer section of a length determined in such a way that the transfer section participates in the acoustic attenuation function of the exhaust duct part. The attenuation unit includes an internal casing of substantially constant cross-section and, together with the external casing, delimits at least one longitudinal peripheral channel for the passage of the fluid. The internal casing has a circular or elliptical cross-section and includes at least one zone deformed radially in such a way as to increase the surface of exchange between the fluid and the attenuation unit.

REFERENCES:
patent: 1554534 (1925-09-01), Straussler
patent: 1627324 (1927-05-01), Green
patent: 2613758 (1952-10-01), Cullum
patent: 2646854 (1953-07-01), Walker
patent: 2911055 (1959-11-01), McDonald
patent: 2990906 (1961-07-01), Audette
patent: 3292731 (1966-12-01), Ballard
patent: 3580357 (1971-05-01), Whitney
patent: 3746126 (1973-07-01), de Cardenas
patent: 4263982 (1981-04-01), Feuling
patent: 4530418 (1985-07-01), Currie

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