| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve to control a fuel injection amount with high precision even when a fuel injection amount is a small quantity. SOLUTION: In a state that a needle valve 20 seats a vale seat, an initial gap di between a fixed core 12 and a moving core 30, a distance between a spacer 14 and a stopper 23, namely a lift amount dl of a needle valve 20 are in a relation di>dl. Further, a formula of 165μm<=dl<=220μm is established. The moving core 30 is sucked to the fixed core 12 and a final air gap (df) between the fixed core 12 and the moving core 30 in a state that a stopper 23 is locked at a spacer 14 is set to (df/di)=0.15. Since the final air gap (df) is set to a low value, a valve opening bounce amount of the needle valve 20 generated when the stopper 23 is collided with the spacer 14 is suppressed.
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