| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection device in which foreign matter is prevented from being caught in a needle valve sliding part and a needle valve actuation part to prevent occurrence of operational failure of a needle valve and a needle valve driving part, occurrence of resulting combustion failure, and generation of abrasion and seizure in the needle valve sliding part, even in an engine using fuel such as crude oil based fuel containing a large amount of foreign matter. SOLUTION: The fuel for the engine is divided into two systems including an operating fuel system to be supplied into an operating oil chamber as operating oil after solid foreign matter removing treatment, and a combustion fuel system to be supplied to a fuel reservoir. In a fuel injection valve, an operating fuel passage is provided in an upper part side of a needle valve bearing part, and a combustion fuel passage is provided in a lower part side of the needle valve bearing part. Pressure Pp in an operating fuel side of the needle valve bearing part is set larger than pressure Pf in a combustion fuel side (Pf>Pf). COPYRIGHT: (C)2008,JPO&INPIT
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