PISTON FOR INTERNAL COMBUSTION ENGINE, INTERNAL COMBUSTION ENGINE, AND DESIGN METHOD OF PISTON FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a piston for an internal combustion engine which promotes a mixture of fuel spays and intake air in a cavity by utilizing a swirl, and can avoid the generation of suit, HC, CO or the like caused by incomplete combustion by suppressing the formation of a fuel over-rich region by the interference of the fuel sprays, and provide the internal combustion engine, and a design method of the piston for the internal combustion engine.SOLUTION: A region of a cavity 10 is divided into sectioned regions Di at respective injection holes 31 of a fuel injection nozzle 30, a shelf part 14 having a recess at an upper side portion of an external periphery of an external peripheral wall 11 of the cavity 10 is arranged at the inside of the sectioned regions Di, a boundary portion with the sectioned region Di+1 which adjoins the sectioned region Di is formed into a shape having no recessed shelf part 14, and a shape of the shelf part 14 is formed so that a gouged amount of the recess becomes large at an upstream side of a swirl, and gradually becomes small at a downstream side of the swirl with respect to a direction of the swirl.SELECTED DRAWING: Figure 1