Direct injection diesel engine
AssigneeKomatsu Ltd.
InventorsYutaka Ono, Tadashi Iijima, Masaki Takahashi
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Abstract
A combustion chamber opening toward a cylinder head is provided on a top surface of a piston, and this combustion chamber comprises a first volume having an inclined surface and a second volume further recessed from the first volume toward a pin boss. Fuel spray F from a fuel injection nozzle is injected toward an inner peripheral wall section of the second volume in a former stage of fuel injection and toward the inclined surface of the first volume in a later stage of fuel injection, and the percentage of the fuel injection period in the former stage against the total fuel injection period is set to the range from 40% to 70%.
Claims5
A direct injection diesel engine comprising:
- a combustion chamber which is provided in a top face of a piston and which opens toward a cylinder head;
- and
- a fuel injection nozzle provided in the cylinder head for injecting fuel toward the combustion chamber,
- wherein the combustion chamber comprises:
- a first volume, open toward the cylinder head, which has a circular periphery at the top face and is recessed from the top face toward a pin boss, and
- a second volume which is provided substantially at a center of the first volume and which is further recessed toward the pin boss than the first volume;
- wherein the fuel injection from the fuel injection nozzle includes a primary fuel injection toward an inner peripheral wall section of the second volume, and a secondary fuel injection, which is performed after the primary fuel injection with a time gap between the secondary fuel injection and the primary fuel injection, toward a bottom surface of the first volume.
Dependencies are inferred from the claim text.