| 摘要 |
PROBLEM TO BE SOLVED: To perform ignition and combustion securely, enable stable combustion operation, reduce exhaust of nitrogen oxide, and improve thermal efficiency. SOLUTION: A precombustion chamber 6 of this pilot oil ignition gas engine is provided with a precombustion chamber main part 11 in which pilot oil is injected from a liquid fuel injection valve 7 and a throat part 12 continuous with a tip of the precombustion chamber main part 11 and connected with a main combustion chamber 4 through a nozzle hole 12c. When volume inside the main combustion chamber 4 at compression top dead center time of a piston is Vc, volume inside the precombustion chamber 6 is Vs, inside diameter of the precombustion chamber main part 11 is D, length inside the precombustion chamber main part 11 is L, and inside diameter of the throat part 12 is d, volume ratio of the precombustion chamber 6 ((Vs/(Vc + Vs)) x 100 ) is set to 2.0 to 10%, dimensional ratio (L/D) of the precombustion chamber main part 11 is set to 0.5 to 3.0, and inside diameter ratio (D/d) of the precombustion chamber main part 11 to the throad part 12 is set to 1.2 to 3.7. COPYRIGHT: (C)2005,JPO&NCIPI
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