Automobile exhaust noise silencer

Details Automobile exhaust noise silencer Automobile exhaust noise silencer

1997-03-03

1998-01-13

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 181272, F01N 100

Patent

active

057082375

ABSTRACT:
An inlet tube leads exhaust gas from an automobile engine to an expansion chamber inside a muffler housing. Exhaust gas from the expansion chamber is discharged to the atmosphere via a first tail tube. A dead space chamber and volume chamber are disposed on either side of the expansion chamber in the housing, and a first internal tube connects the volume chamber and expansion chamber. A second internal tube having a valve which opens under pressure of the exhaust gas connects the volume chamber and dead space chamber. Exhaust gas from the dead space chamber is discharged to the atmosphere via a second tail tube. As the dead space chamber and volume chamber are not adjacent, pressure waves in the volume chamber do not cause a volume change of the dead space chamber, and emission noise from the second tail tube due to excitation of a resonance system comprising the dead space chamber, is reduced.

REFERENCES:
patent: 4484659 (1984-11-01), Buchwalder
patent: 4971166 (1990-11-01), Hase
patent: 5614699 (1997-03-01), Yashiro et al.

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