| 摘要 |
PURPOSE: To enable output with high volumetric efficiency and reduction of fuel consumption while reducing NOx and smoke by making the best use of a merit of an entrant type combustion chamber with a center projection to the maximum. CONSTITUTION: Plural intake ports 12, 13 are formed on a cylinder head 11. A combustion chamber 15 comprising a shelf part 16 along an opening edge, a side wall part 17 having a circular-arc section, and a bottom wall part 19 having an annular projection 18 is formed on the top 14 of a piston.
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