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. 31, 1984
Filed:
May. 14, 1982
Takashi Ishida, Ohi, JP;
Noboru Tominari, Tokyo, JP;
Mikuni Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A throttle valve disposed within the intake bore of an internal combustion engine. The valve thickness is large, preferably more than about 1.5 mm and less than 1/10 of the valve diameter. The full closed angle of the valve is less than 5.degree.. The circumferential edge of the valve has a roundness having a radius less than about five times as large as the valve thickness. When the valve is fully closed, there is a clearance L of about 1/10,000 to 5/1,000 of the intake bore diameter between the circumferential edge of the valve and the inner surface of the intake bore. The valve reduces the degree of air flow change at small opening angles of the valve as in the idling or low-speed operation of the engine so as to reduce the change of air flow caused by the change of the valve opening. Thus, an optimum air-fuel ratio in a range of small opening angles of the valve can be easily maintained.