Diesel engine piston

A combustion chamber (2) of the present invention with a projection (7) protruding toward the center of the combustion space in the profile side (5) to form a combustion space consists of an inner wall surface forming the upper portion of the combustion space in the top to the bottom by forming the lower part of the combustion space, it can be dual to flow the sprayed fuel injected towards the profile surface 5 spreading in the lower part of the spreading in the upper part of the combustion space relative to the projections (7) flows and the combustion space mixer giving significantly increase the formation rate, in addition, not to cause the two or more fuel spray injected at the same time the overlap has a reduced fuel efficiency and characteristics capable of preventing incomplete combustion that increases the harmful emissions gaseuyang.