| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve the uprightness of the initial injection rate gradient and reduce the dynamic leak amount of a fuel injection valve. Ž<P>SOLUTION: This fuel injection valve includes an inflow side throttle valve element 26 for varying a flow passage area (inlet side throttle area) of an inflow side throttle 13. Fuel pressure in an outflow passage 11 acts on the inflow side throttle valve element 26 in the direction of reducing the inlet side throttle area. Therefore, when the outflow passage 11 is opened with respect to a control chamber 9, the inlet side throttle area is reduced more than before the outflow passage is opened. Since the inflow of fuel into the control chamber 9 is suppressed, the fuel pressure in the control chamber 9 can be prematurely reduced, and the uprightness of the initial injection rate gradient can be achieved. During the injection period, the outflow passage 11 continues to be opened to the control chamber 9, and the inlet side throttle area is maintained in a small state. Since the inflow of the fuel into the control chamber 9 can be suppressed even during the injection, the dynamic leak amount can be reduced. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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