| 摘要 |
PROBLEM TO BE SOLVED: To efficiently mix injection fuel with air in all operation regions and suppress the generation of smoke by forming a fuel dispersion body at the center of a cavity formed by recessing a top face of a piston like a plate and forming a fuel collision part having a specific shape in this fuel dispersion body. SOLUTION: In a direct-injection type diesel engine, a cavity (combustion chamber) 11 formed by recessing like a plate is provided in a top part 12 of a piston 10, and a fuel dispersion body 30 is formed in substantially central part of the cavity 11 in such a way that it rises upward. Moreover, a fuel injection nozzle 20 provided with a plurality of injection holes 21 is arranged in opposition to the cavity 11, and a fuel collision part 31 against which injection fuel F jetted from a plurality of injection holes 21 collides when the piston 10 is in the vicinity of a top dead center(TDC) is formed in the fuel dispersion body 30. Furthermore, this fuel collision part 30 is formed into such shape that it is out of injection fuel F when the piston 10 moves from the vicinity of the top dead center to bottom dead center. |
