| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fuel injection valve from not being incapable of injecting fuel by discharging air intruding in a liquid chamber between both pistons to the outside of the liquid chamber. SOLUTION: In the fuel injection valve in which a first piston 43 is driven by a piezoelectric stack, a second piston 44 is operated upon receiving pressure from the liquid chamber 45, and the operation of a nozzle is controlled according to the operation of the second piston 44, a guide face 431 for guiding air in the liquid chamber 45 to the outer peripheral side of the first piston 43 is provided on a face on the liquid chamber 45 side of the first piston 43. The air A intruding inside the liquid chamber 45 moves to the outer peripheral side of the first piston 43 along the guide face 431 and is discharged via a gap between the first piston 43 and an actuator cylinder 42. COPYRIGHT: (C)2009,JPO&INPIT
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