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:
Jul. 03, 1984
Filed:
Aug. 12, 1982
Ituo Koga, Okazaki, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A helically-shaped intake port comprising a helical portion formed around intake valve, and a substantially straight inlet passage portion tangentially connected to the helical portion. A bypass passage is branched off from the inlet passage portion and connected to the helical portion. A rotary valve is arranged in the bypass passage and actuated by a vacuum operated diaphragm apparatus. The vacuum chamber of the diaphragm apparatus is connected to the interior of the intake manifold via a vacuum port and a check valve cooperating with the vacuum port. The check valve opens the vacuum port when the level of vacuum in the intake manifold becomes greater than that of vacuum in the vacuum chamber. In addition, the vacuum chamber is connected to the atmosphere via an atmosphere port and an air valve cooperating with the atmosphere port. The air valve opens the atmosphere port when the level of vacuum in the venturi portion of the carburetor becomes greater than a predetermined level for opening the rotary valve. The atmosphere port has a flow area which is slightly larger than that of the vacuum port.