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:
Jun. 05, 2012
Filed:
Dec. 31, 2008
Takashi Youso, Hiroshima, JP;
Toshiaki Nishimoto, Hiroshimi, JP;
Masahisa Yamakawa, Hiroshima, JP;
Tatsuya Fujikawa, Hiroshima, JP;
Takashi Youso, Hiroshima, JP;
Toshiaki Nishimoto, Hiroshimi, JP;
Masahisa Yamakawa, Hiroshima, JP;
Tatsuya Fujikawa, Hiroshima, JP;
Mazda Motor Corporation, , JP;
Abstract
Disclosed is an internal combustion engine (A), which has a valve overlap period (T) during which an intake valve () and an exhaust valve () are opened, and a geometric compression ratio of 13.0 or greater. The engine (A) is designed to satisfy, at a center timing (Tc) of the valve overlap period (T), a conditional expression: S≧Swhere Sis a cross-sectional area of a combustion chamber () taken along any selected one of a plurality of mutually parallel hypothetical cutting-planes (IP) each of which extends parallel to a linear reciprocating direction (dor d) of at least one of the intake and exhaust valves () and passes through a valve head (or) of the at least one of the valves (), and Sis an effective opening area defined between the valve head (or) and a corresponding valve seat (or) in a region on an outward side of the combustion chamber () relative to the selected hypothetical cutting-plane (IP). The present invention can reliably improve combusted-gas scavenging efficiency and intake-air charging efficiency.