device for schalldaempfung in a rohrkanal

摘要

A sound damping device ( 4 ) for a tubular duct ( 2 ), particularly a gas transporting tract of an internal combustion engine ( 1 ) having a least one bypass channel ( 5 ) running parallel to a main duct ( 6 ) in a section of the duct ( 2 ). The bypass channel ( 5 ) is longer than the main duct ( 6 ) between a branching off point ( 7 ) and a re-entry inlet ( 8 ). The bypass duct according to the invention is configured as a spiral duct ( 5 ) which winds around the centrally disposed main duct ( 6 ) in order to decrease the installation space requirements for the noise suppressor ( 4 ).