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:
Apr. 23, 2013
Filed:
Sep. 26, 2008
Ryo Hasegawa, Susono, JP;
Ryo Hasegawa, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A plurality of convex portions are radially fanned and spaced apart from each other by a constant angle in a planar view on a tapered surface of a land portion formed on a bottom surface of a cavity formed in a top portion of a piston. Each convex portion is positioned such that the extending direction of the convex portion aligns with an axis X of a corresponding fuel spray. Thereby, each fuel spray moves forward through a space (convex portion space) between the corresponding convex portion and an inner wall of a cylinder head portion along the extending direction of the corresponding convex portion. When a fuel injection is performed during the latter half of a compression stroke, a pressure in a convex portion space is increased, compared with a pressure in a space of the other portion by the decrease of a ratio of the volume of the convex portion space relative to the volume of the space of the other portion by the proceeding of the compression by the piston. Each fuel spray is circumferentially expanded by the pressure difference.