| 主权项 |
1. A compression ignition internal combustion engine comprising:
a cylinder block and a cylinder head; a piston including a cavity that defines a combustion chamber in cooperation with the cylinder block and the cylinder head; and a nozzle for injecting fuel into the combustion chamber, wherein the cavity includes:
a raised portion raised toward the nozzle;a bottom surface formed around the raised portion; andan open surface and a reentrant surface that are continuous to the bottom surface, a depth of the open surface becomes shallower toward a radially outer side of the piston, a distance from the nozzle to the open surface is greater than a distance from the nozzle to the reentrant surface, a height position, in a central axis direction of the piston, of a ridgeline between the bottom surface and the open surface is lower than a height position, in the central axis direction of the piston, of a ridgeline between the bottom surface and the reentrant surface, the nozzle injects first and second fuel sprays toward the open surface and the reentrant surface, respectively, the nozzle injects a third fuel spray between the first and second fuel sprays, the nozzle injects a fourth fuel spray sandwiching the first fuel spray in cooperation with the third fuel spray, and when the piston is viewed in the central axis direction, a distance to the nozzle from a point where an outer circumferential edge of the open surface intersects a direction of the third fuel spray is greater than a distance to the nozzle from a point where the outer circumferential edge of the open surface intersects a direction of the fourth fuel spray. |
