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:
Apr. 03, 2001
Filed:
Apr. 16, 1999
Minoru Komada, Yokkaichi, JP;
Kazuo Fujihara, Komaki, JP;
Yoshikazu Hirose, Haguri-gun, JP;
Takahiro Komori, Inazawa, JP;
Hitoshi Kino, Ichinomiya, JP;
Hidetoshi Ishihara, Nagoya, JP;
Toyoda Gosei Co., Ltd., Nishikasugai-gun, JP;
Abstract
An intake duct capable of reducing intake noise when an engine runs at a low speed and supplying a sufficiently large amount of air when the engine runs at a high speed without using any electron control circuit or electromagnetic valve, which is produced at low costs. The intake duct includes valve adjusting means which restrains the movement of the valve member when the valve member brings a second intake passage from the closed state to the open state, and facilitates the movement of the valve member when the valve member brings the second intake passage from the open state to the closed state. When the second intake passage is brought to the open state from the closed state, the restraining force of the valve adjusting means is great to restrain the movement of the valve member, and when the second intake passage is brought to the closed state from the open state, the valve member readily pivots to open the second intake passage. Thus, the valve member is free from the half-closed state, and consequently, the generation of low-frequency booming noise can be prevented.