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:
Dec. 28, 1993
Filed:
Jun. 08, 1992
Noriaki Mitobe, Hiroshima, JP;
Masaki Harada, Hiroshima, JP;
Kouichirou Waki, Hiroshima, JP;
Takuro Shigemura, Hiroshima, JP;
Isao Shimizu, Hiroshima, JP;
Isamu Iguchi, Hiroshima, JP;
Masatoshi Shoji, Hiroshima, JP;
Masaru Shimada, Hiroshima, JP;
Hiroyuki Chado, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An intake system for a multiple-cylinder engine a plurality of primary discrete intake passages and a plurality of secondary discrete intake passages. Each pair of primary discrete intake passage and the secondary discrete intake passage communicate with one of the cylinders. Both the primary and secondary discrete intake passages are straight and the primary discrete intake passage is provided with a primary valve member which is provided with an opening and is selectively positioned in a closed position where the primary valve member limits the effective cross-sectional area of the primary discrete intake passage to the cross-sectional area of the opening and in an open position where the primary valve member wide opens the primary intake passage. The secondary discrete intake passage is provided with a secondary valve member which is moved between a closed position where it substantially closes the secondary discrete intake passage and an open position where it wide opens the secondary discrete intake passage.