Noise reduction in engine exhaust

Details Noise reduction in engine exhaust Noise reduction in engine exhaust

1980-06-16

1982-03-23

Hix, L. T.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181278, F01N 108, F01N 116

Patent

active

043208150

ABSTRACT:
Noise reduction mechanism for an engine, especially effective during idling nd operation at low RPM, is disclosed. Under those conditions, engine exhaust noise often represents a predominant part of the total vehicle noise. The noise reducing mechanism comprises a flow-throttling element that substantially closes the main exhaust passage when the engine is in the low-speed range; the exhaust gas and noise is forced to flow through a more effective muffling device to reduce the noise at the exit end of the system. At high engine speeds, the throttling mechanism is deflected to a maximum flow condition for avoidance of undesired back pressure in the exhaust system.

REFERENCES:
patent: 3111192 (1963-11-01), Recupito
patent: 3346071 (1967-10-01), Lader
patent: 3703937 (1972-11-01), Tenney
patent: 3969895 (1976-07-01), Krizman

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