FUEL INJECTION DEVICE

PROBLEM TO BE SOLVED: To provide a fuel injection device capable of reducing time from regulation of fuel discharge from a control chamber to movement of a valve element to a prescribed position. SOLUTION: This device has the control chamber comprising a first control chamber 51 and a second control chamber 52, and is composed to provide communication between the first control chamber 51 and the second control chamber 52 by a pressure regulating restriction channel 61 in such a state that fuel pressure in the control chamber gets relatively low. In this structure, pressure difference is generated between the first control chamber 51 and the second control chamber 52 since flow of fuel to the second control chamber 52 from the first control chamber 51 is limited. When an out orifice 56 is blocked, pressure of the first control chamber 51 and the second control chamber 52 get same. Time from blockage of the out orifice 56 to movement of a valve element to a prescribed position (valve closed position), however, can be shortened since fuel pressure of the first control chamber 51 changes in a relatively high state by the pressure regulating restriction channel 61. COPYRIGHT: (C)2010,JPO&INPIT