METHOD OF FORMING COMBUSTION CHAMBER OF DIESEL ENGINE AND COMBUSTION CHAMBER OF DIESEL ENGINE FORMED BY USING THE METHOD

摘要

PROBLEM TO BE SOLVED: To easily determine the data as the components of a combustion chamber capable of easily specifying an ideal shape of the combustion chamber. SOLUTION: In this diesel engine, fuel is directly injected from an injection nozzle into the combustion chamber 1 formed of the lower surface 6 of a cylinder head 5 and a recess 10 formed in a piston head 8 at the end of a compression stroke for moving a piston 3 to a top dead center, and the wall surface of the recess 10 is formed on a convex surface 18a projected to the outside of the piston continuously around the centerline L of the piston. Based on an angle 2 formed by a virtual centerline 22 of the injected fuel injected from the injection nozzle and moving to the convex surface 18a and the lower surface 6 of the cylinder head, the intersection 24 of the virtual centerline 22 with the wall surface of the combustion chamber and the ratio of a combustion chamber depth H1 to a distance L1 between piston head top faces 9 are obtained to specify the shape of the recess.