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:
Jan. 06, 2009
Filed:
May. 25, 2005
Keiichi Tsujimoto, Osaka, JP;
Shunji Hamaoka, Osaka, JP;
Keiichi Tsujimoto, Osaka, JP;
Shunji Hamaoka, Osaka, JP;
Yanmar Co., Ltd., Osaka-shi, JP;
Abstract
An object of the present invention is to provide a combustion chamber shape of a direct injection type diesel engine in which a black smoke generation amount can be suppressed during no-load operation while suppressing NOx and fuel consumption. The combustion chamberis formed in a recessed shape in a piston top walland injecting fuel at a predetermined nozzle hole angle α into the combustion chamberfrom a nozzle holeof a fuel injection valve having a nozzle hole center Osubstantially on a cylinder center line. A wall face of the combustion chamberincludes: a conical mountain portionformed at a central portion in the combustion chamber and having such a slope angle and skirt end diameter Dthat fuel spray does not collide with the mountain portion; a slope portionthat inclines downward and outward from a skirt end of the mountain portionat a smaller angle than the slope angle of the mountain portionand with which the fuel spray collides; and a saucer portionwhich rises in an arc shape from an outer peripheral end of the slope portionto reach an outer peripheral end of the combustion chamber and with which the fuel spray collides.