Noise attenuator and vehicle air intake duct provided therewith
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United States of America Patent
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-
Jul 1, 2014
Grant Date -
Oct 24, 2013
app pub date -
May 14, 2013
filing date -
Jul 28, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A noise attenuator which can reduce time and cost for installation thereof as compared with the conventional configuration and a vehicle air intake duct provided with the noise attenuator are provided. The noise attenuator includes a pair of circular through holes formed through a duct wall, a pair of wave transmitting/receiving membrane which are stretched so as to close the circular through holes, and a seesaw member which connects between central portions of the paired transmitting/receiving membranes. Accordingly, when one of the membranes receives a sound wave of noise thereby to be vibrated at a predetermined frequency, the other membrane follows it and is also vibrated while shifted by a half cycle. As a result, a cancellation wave with a phase opposite to the sound wave received by the one membrane is transmitted from the other membrane, whereupon the noise can be attenuated.
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