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. 07, 2011
Filed:
Jul. 02, 2009
Toshiaki Nishimoto, Hiroshima, JP;
Naoya Watanabe, Higashihiroshima, JP;
Kazuhiro Nagatsu, Hiroshima, JP;
Masatoshi Hidaka, Higashihiroshima, JP;
Hiroaki Abe, Hiroshima, JP;
Toshiaki Nishimoto, Hiroshima, JP;
Naoya Watanabe, Higashihiroshima, JP;
Kazuhiro Nagatsu, Hiroshima, JP;
Masatoshi Hidaka, Higashihiroshima, JP;
Hiroaki Abe, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
There is provided a spark ignited internal combustion engine having a geometric compression ratio of 13.0 or greater. The engine comprises combustion chambers having a cylinder stroke volume of 0.3 liter or greater, with the spark plug in the chamber ceiling having its spark point in the combustion chamber, and a cavity being formed on the top surface of the piston. At least part of the cavity defines a spherical surface that a hypothetical sphere having its center at the spark point contacts when the piston is at top dead center. The cavity is formed so that V/V≧0.31, where Vis top-dead-center combustion chamber volume, and Vis the volume of the part of the hypothetical sphere not interfering with the combustion chamber floor or ceiling at top dead center. The flame thus spreads with less interference, shortening combustion duration and reducing fuel consumption.