| 摘要 |
PURPOSE:To improve the extent of combustion capacity, by forming a spray groove, spraying a combustion flame in a swirl chamber in an opposite direction to a tilting direction of a nozzle hole in a main combustion chamber, into a specified form. CONSTITUTION:A swirl chamber 1 is interconnected to a main combustion chamber 2 of a Diesel engine via a rear-up tilted nozzle hole 3. A spray groove 12, spraying a combustion flame in the swirl chamber 1 in an opposite direction Q to a tilting direction P of the nozzle hole 3 inside the combustion chamber 2, is formed into a shape cutting in the rear from a circumferential rear part of the nozzle hole 3 with smaller width T than width S of the nozzle hole 3. Combustion gas is sprayed to the main combustion chamber 2 along the nozzle hole 3, while it is also sprayed to the opposite direction Q to the tilting direction of the nozzle hole 3 after passing through the spray groove 12. The flame is speedily reached to even a part of the main combustion chamber 2 in this opposite direction, whereby a flame propagation velocity is in no case dropped. Thus, combustion capacity is improvable.
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