Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1995-01-27
1997-08-26
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181252, 181267, 181276, 181258, F01N 124
Patent
active
056612729
ABSTRACT:
The present invention is a noise reduction apparatus for use in the exhaust system of an internal combustion engine which absorbs acoustical energy from the pressurized exhaust gases while minimizing restrictions on the exhaust gases as they flow therethrough. The relatively unrestricted exhaust gas flow provided by the present invention significantly reduces the build up of back pressure and the associated drop in power and performance of the engine. At the same time, by absorbing acoustical energy from the exhaust gases, the noise level of the exhaust system is reduced. The present noise reduction apparatus includes a housing operatively adapted for being disposed in the exhaust system of an internal combustion engine, and a plurality of generally concentric and radially spaced tubular sections disposed inside of the housing. Each tubular section is adapted with a porous wall which allows exhaust gases to flow therethrough. A plurality of sound absorbing layers are also disposed inside the housing. Each layer is operatively adapted to allow exhaust gases to flow therethrough while absorbing acoustical energy from exhaust gases coming in contact with the layer. Each layer is also operatively associated with one tubular section to allow exhaust gases to flow through the housing, from one end to the other, without having to flow through one of the sound absorbing layers.
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