Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1989-07-10
1990-06-26
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181229, 181265, F01N 108
Patent
active
049364138
ABSTRACT:
An in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is an outer tube, and the other part, an insert disposed within the first part. The insert comprises a hollow ogival-shaped section that is axially coextensive with a frusto-conically shaped section of the outer tube to form an annular flow path of substantially constant cross section for the inducted air. The flow then passes through apertures in the insert to enter a venturi section. The flow continues through the venturi section and then exits the device. The venturi section serves to choke noise that propagates from the engine in the direction opposite the direction of airflow. The noise is reflected back to the engine by the hollow interior of the ogival-shaped section which is open toward the venturi section.
REFERENCES:
patent: 2671523 (1954-03-01), Walker
patent: 3888332 (1975-06-01), Roe et al.
patent: 4172508 (1979-10-01), Moss et al.
patent: 4550799 (1985-11-01), Flugger
patent: 4782912 (1988-11-01), Wandless
Boller George L.
Fuller Benjamin R.
Siemens-Bendix Automotive Electronics Limited
Wells Russel C.
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