Yanmar Co., Ltd.

Sigeru Yoshikawa

Shunji Hamaoka

Seita Akimoto

A combustion system for direct injection diesel engines, having a fuel injection nozzle provided with upper and lower rows of nozzle holes and disposed so as to be opposed to a deep dish combustion chamber of a small opening ratio. The directions of the upper nozzle holes ( ) in the upper row and those of the lower nozzle holes ( ) in the lower row are set so that fuel injected from the upper nozzle holes ( ) reaches a side wall of the combustion chamber and fuel injected from the lower nozzle holes ( ) impinges upon a bottom surface ( ) of the combustion chamber. A ratio of a fuel spray travel from the upper nozzle holes ( ) to a diameter of each of the upper nozzle holes is set to 150-250. The number of said upper nozzle holes ( ) is set twice as large as that of said lower nozzle holes ( ).

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Osaka, Japan

Sigeru Yoshikawa