Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1976-11-08
1978-09-26
Tomsky, Stephen J.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181256, 181272, F01N 104, F01N 100
Patent
active
041163036
ABSTRACT:
Exhaust muffler for sound suppression, particularly designed as an automotive muffler, which comprises a gas inlet tube communicating with a first chamber in an outer, preferably cylindrical, casing, and an exit tube coaxially aligned with the inlet tube within the casing, the inner end of the exit tube being spaced from the inlet tube and communicating with the first chamber. An imperforate boundary or baffle is positioned in the annulus between the outer wall of the exit tube and the inner wall of the outer casing, and intermediate the ends of the exit tube, the annular space to the rear of the baffle, between the exit tube and the casing, forming a second chamber which is filled with a sound absorber such as glass wool. The exit tube is perforated along the area thereof adjacent to the second chamber for fluid communication therewith. The muffler construction provides two expansion chambers in series, wherein the second chamber has the dual function of serving as the second expansion chamber to improve low frequency noise reduction and as a resistive absorber to improve middle and high frequency noise reduction.
REFERENCES:
patent: 2166417 (1939-07-01), Manning
patent: 2205899 (1940-06-01), Chipley
Geldin Max
McDonnell Douglas Corporation
Tomsky Stephen J.
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