| 摘要 |
PROBLEM TO BE SOLVED: To secure higher injection pressure without increasing supply pressure from a pressure accumulating chamber. SOLUTION: This fuel injector is provided with a pressure accumulating chamber 1 for accumulating high-pressure fuel, a nozzle hole 5 provided on an oil storage chamber 4 into which fuel from the pressure accumulating chamber 1 is to be guided through an oil passage 7, and a valve 6 for opening and closing the nozzle hole 5. A dynamic pressure piston 23 to be moved according to differential pressure between the upstream side and the downstream side is provided on the way of the oil passage 7, the dynamic pressure piston 23 is moved in fuel injection, dynamic pressure is made to act on the oil storage chamber 4, and therefore, high injection pressure is maintained.
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