To reduce a capacity of a pump for supplying fuel in a fuel injection valve in which a displacement enlargement rate is varied when a nozzle needle is lifted.
An outer needle stopper 3 is slidably attached to the outer periphery of the nozzle needle 12 on the opposite side to an injection hole. When a piezoelectric piston 6 is driven by a piezoelectric actuator so that the pressures of displacement enlarging chambers 222, 232 are increased, the nozzle needle 12 and the outer needle stopper 3 receive the pressures and the nozzle needle 12 is urged in a valve opening direction. When an amount of lift of the nozzle needle 12 reaches a predetermined lift amount, the movement of the outer needle stopper 3 is restricted by a stopper 236 so that the displacement enlargement rate is varied. Further, since a high pressure part is connected to a low pressure part via a sliding part through only one path extending from the displacement enlarging chamber 222 via the outer peripheral side of the piezoelectric piston 6 to the low pressure part, a fuel leak amount to the low pressure part is decreased to thereby reduce the capacity of the fuel supplying pump.
| WO/2014/044439 | INJECTION VALVE AND EXHAUST GAS AFTER TREATMENT DEVICE |
| JPH09189279 | FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINE |
| WO/2018/146004 | CONTROL VALVE ARRANGEMENT FOR A DUAL FUEL INJECTOR |
NONOYAMA YOSHIHARU
MATSUMOTO SHUICHI
DENSO CORP
Takahiro Miura
Fumihiro Mizuno