Muffler with variable damping characteristics
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United States of America Patent
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-
Oct 13, 1998
Grant Date -
N/A
app pub date -
Oct 25, 1996
filing date -
Nov 2, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A muffler and an actuating cell provided so that the acoustic properties of the muffler can be changed. The pressure drop in the muffler is fed to the actuating cell as a control pressure. The actuating cell has a plurality of chambers which are separated by diaphragms. Each diaphragm is supported by a spring and each chamber has a pressure connection. A first pressure line feeds the total gas pressure to the overpressure side of the first diaphragm. Another pressure line directs the static gas pressure to the low-pressure side of this diaphragm. Attached to the diaphragm is a piston rod which carries a valve closing element which closes or opens a gas feed pipe.
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