Exhaust chamber comprising an envelope defining a gas circulation passage
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United States of America Patent
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Issued Date -
Sep 22, 2005
app pub date -
May 19, 2005
filing date -
Apr 12, 2002
priority date (Note) -
Abandoned
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Abstract
An exhaust chamber includes an external envelope (10), defining a gas circulation passage and at least one continuous wall (16, 20, 22, 24) along which at least one cover piece (26A, 26B, 30, 32, 34) is arranged, the or each cover piece (26A, 26B, 30, 32, 34) only extending over a limited region of the continuous wall. The dimensions of the cover piece (26A, 26B, 30, 32, 34) and the connection between the cover piece and the continuous wall are selected such that for at least one excitation frequency in the exhaust chamber between 200 Hz and 4 kHz inclusive the cover piece and the continuous wall vibrate with a phase shift of at least 90.degree.. The above finds application in the field of automobile exhausts.
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