To improve the atomization state of fuel when an injector performs sub fuel injection in timing different from main fuel injection, in a fuel direct injection-type diesel engine.
This fuel direct injection-type diesel engine has a recessed combustion chamber 22 facing a cylinder head 13 on a central part of the top surface 17a of a piston 17 slidably supported on a cylinder 16, and fuel is injected from an injector 23 supported on the cylinder head 13 toward the combustion chamber 22. The top surface 17a of the piston 17 for surrounding the combustion chamber 22 has no valve recess and formed into a flat shape, and sub fuel injection to be performed across main fuel injection by the injector 23 is directed to an opening end 22a of the combustion chamber 22. Accordingly, the sub fuel injection is not affected by the value recess formed by cutting the opening end 22a of the combustion chamber 22, and the atomization state of fuel formed by the sub fuel injection is uniformized in the circumferential direction of the combustion chamber.
SHIMOYAMA KAZUAKI
MAMIYA HIROYUKI
MINAMI HIDEKI
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