VERBRENNUNGSVORRICHTUNG FÜR DIREKTEINGESPRITZTE DIESELMOTOREN

摘要

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. A ratio of a fuel spray travel from, said lower nozzle holes to a diameter of each of said lower nozzle holes is set to 100-180. A ratio of a total area of all of lower nozzle holes to that of all of said upper and lower nozzle holes is set to 0.25-0.35. The number of said upper nozzle holes is set twice as large as that of said lower nozzle holes.