| 摘要 |
PROBLEM TO BE SOLVED: To improve the sharpness of an injection finish of fuel when a needle closes an injection hole. SOLUTION: Flow passage area A1 of a fuel supply orifice 61 is set to be smaller than a flow passage area A2 of an injection control chamber orifice 33. Thus, in the valve closing process in which the needle 51 closes the injection hole 23, fuel pressure is supplied from a common accumulator 2 to a fuel sump 52 and an injection control chamber 3 so that pressure for supplying fuel to the fuel sump 52 is lower than that to the injection control chamber 3. In the valve closing process, therefore, force to an injection hole 23 side acting on the needle 51 can be increased, and valve closing speed of the needle 51 can be increased. COPYRIGHT: (C)2006,JPO&NCIPI
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