Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1999-02-08
2000-07-04
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181272, 181282, H05K 500
Patent
active
060824875
ABSTRACT:
A muffler is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell defining an internal volume. A first, inner, perforated wall is spaced from the outer shell and defines a first, annular, volume therebetween. A first volume of packing material is positioned within the annular volume. An inlet tube is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25% of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.
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Angelo Theodore G.
Hamrin John
Hiemstra John
Stenersen Eivind
Wagner Wayne M.
Dang Khanh
Donaldson & Company, Inc.
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