The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2004
Filed:
Feb. 13, 2003
Franz Josef Wolf, Bad Soden-Salmünster, DE;
Udo Gärtner, Sinntal-Sannerz, DE;
Josef Hohmann, Steinau-Ürzell, DE;
Anton Wolf, Gelnhausen, DE;
WOCO Franz-Josef Wolf & Co. GmbH, Bad Soden-Salmuenster, DE;
Abstract
The invention relates to a silencer ( ) for noise-laden gas pipes, especially for a suction pipe and/or an exhaust pipe of an internal combustion engine, comprising an outer pipe ( ) with an inlet side ( ) and an outlet side ( ), a plurality of diaphragm rings ( ) each with an outer surface connected ( ) to the inner surface of the outer pipe ( ), at least one insert ( ) with an outer surface connected ( ) to the inner surface of the outer pipe ( ) and/or the diaphragm rings ( ) and with a plurality of openings ( ) which are closed on one side. Said insert ( ) forms sub-pipes for the gas flow in the silencer, and the openings ( ), which are closed on one side, open into the sub-pipes, the depth thereof being /4 in relation to the wavelength of a frequency to be silenced. At least one perforated wall ( ), extends between at least two diaphragm rings ( ) whereby an outer surface is connected ( ) to at least one inner surface of the two diaphragm rings ( , wherein at least one resonance cell is fixed between the two diaphragm rings ( ) of the perforated wall ( ) and the outer pipe ( ).