| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection nozzle of a simple structure capable of certainly preventing oil dilution caused by post injection. SOLUTION: This nozzle is provided with a normally closed main needle 4 lifted by liquid pressure of a fuel sump 3 when rising pressure of the fuel sump 3 connected/retained to/by a fuel passage 2, a post passage 6 connected to the fuel passage 3 only when the main needle 4 is closed, a post nozzle hole 8 opened toward the center of a combustion chamber at the end of the post passage 6, and a normally closed post needle 10 normally closing the post passage 6 and opened when outputting a post injection signal from a controller. Thereby, in main injection, fuel is ejected in an optional form excellent in combustion efficiency, while in post injection, fuel is ejected toward the center of the combustion chamber to prevent oil dilution. COPYRIGHT: (C)2008,JPO&INPIT
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