Fuel injection valve

A fuel injection valve to be connectable to a hydraulic pressure passage and a drain passage, comprising:

• a valve housing having at least an injection hole;
• a nozzle needle slidably movable in the valve housing for opening and closing the injection hole;
• a control chamber for urging the nozzle needle in a direction of closing the injection hole when hydraulic pressure is applied thereto and making the nozzle needle start lifting when hydraulic pressure reaches a minimum valve opening pressure;
• a low pressure conduit to be connected to the drain passage;
• a high pressure conduit to be connected to the high pressure passage;
• a three ways valve having a valve chamber, first, second and third ports provided in the valve chamber and a valve body movable in the valve chamber;
• driving means for driving the valve body so as to selectively open and close the first and second ports;
• a first conduit for communicating the first port to the low pressure conduit;
• a second conduit for communicating the second port to the high pressure conduit;
• a third conduit having a main orifice for communicating the third port to the control chamber;
• a fourth conduit having a sub orifice for communicating the control chamber to the high pressure conduit so that high pressure may be applied to the control chamber,
• wherein the control chamber may be communicated to the low pressure conduit via the third conduit, the valve chamber and the first conduit, when the valve body opens the first port and closes the second port, and be communicated to the high pressure conduit via the third conduit, the valve chamber and the second conduit, when the valve body closes the first port and opens the second port.