| 摘要 |
PURPOSE:To shorten time for an ignition delay as well as to prevent the occurrence of noise to the smallest possible extent, by forming an almost conical body-form projecting part in a sinking part of the head top surface of a piston, while making both main and auxiliary nozzle holes of an injection front toward a specified direction. CONSTITUTION:In this combustion chamber 4, its head top surface 2 is sunk in a hollow form, while a projecting part 3 is formed at almost the central part of a bottom surface 7 of this sinking part. A main nozzle hole 11 of a multihole type injection nozzle 6 is installed position fronting on the side wall of the combustion chamber 4. An auxiliary nozzle hole 12 being smaller in diameter than that of the main nozzle hole 11 is made to front toward a direction nearly along a side wall incline of the projecting part 8. Doing like this, time for an ignition delay is shortened as well as the combustion required for fuel or fuel-air mixture can be made to slow down, thus the occurrence of noise can be prevented remarkably to the smallest possible extent. |
