DIRECT-INJECTION DIESEL ENGINE

PURPOSE:To suppress an ignition lag and a rise of combustion pressure, by supplying a small amount of fuel from an injection nozzle to be ignited in a subcombustion chamber in an up-stroke of a piston and injecting a flame of the fuel into a main combustion chamber from a communication hole simultaneously supplying fuel into the main combustion chamber. CONSTITUTION:When an engine is in a suction stroke, a small amount of fuel is supplied from the second injection nozzle 19 into a subcombustion chamber 16 in the half way of a rising piston 12, simultaneously the rising action of the piston 12 generates a strong swirl in the subcombustion chamber 16. In this way, the engine both prevents adhesion of carbon or the like to an ignition plug 20 and obtains stable further good ignition. And the engine, injecting a flame ignited in the subcombustion chamber 16 into a main combustion chamber 14 from a communication hole 17, ceaselessly ignites fuel in the main combustion chamber 14. While the fuel for the main combustion chamber 14 is supplied by the first injection nozzle 15 in the vicinity of the top dead center of the piston 12 almost simultaneously with the injection of the flame from the subcombustion chamber 16.