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US 4,225,011 AGranted
Method and device for silencing the exhaust noise of internal combustion engines
OwnerMoriyuki Taguchiinventor
Life of this patent
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Abstract
An exhaust gas silencing system wherein standing waves are utilized in a silencing chamber to reduce low frequency components of noise, and a downstream muffler is utilized to reduce the high frequency components of noise. An expansion chamber can be utilized further to reduce the pressure of the sound waves.
Claims3
The method of silencing noise in the exhaust stream from an internal combustion engine, having a noise component intended to be silenced which has a relatively low frequency, and also high frequency noise components, comprising:
- a. in a silencing chamber, forming a standing wave from said low frequency noise component, said standing wave having a node with least amplitude along its axis within said silencing chamber;
- b. withdrawing the exhaust stream from the silencing chamber in a direction lateral relative to said axis of said standing wave at an axial location substantially axially aligned with said node;
- and
- c. thereafter passing the exhaust stream withdrawn from the silencing chamber through a muffler adapted to muffle the high frequency components.
1 more element
Dependencies are inferred from the claim text.