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:
Aug. 06, 2002
Filed:
Jun. 21, 2000
Helmut Spannbauer, Moeglingen, DE;
Filterwerk Mann & Hummel GmbH, Ludwigsburg, DE;
Abstract
A duct system with a throttle valve, particularly useful as an air intake duct for an internal combustion engine, in which the throttle valve is configured in such a way that in the closed position it covers only a partial region of the cross-sectional area of the duct which is to be throttled and leaves another partial region open so that air can continue to flow through the intake duct. This condition is suitable, particularly at low engine rotational speeds, to dampen the air intake noise of the internal combustion engine. When the throttle valve is positioned perpendicular to the direction of air flow through the duct, sound waves in the air intake duct of the internal combustion engine are reflected back toward the engine, and in this way an economical possibility for influencing the air intake noise results which also can be utilized to design a desired noise profile for the engine.