| 摘要 |
In a normally closed type fuel injection valve, an accurate valve function can be achieved over a long period of time by making a durability sufficient while securing gas and liquid tightness of a valve function portion. A fuel injection valve (1) provided with a stopper core (3) forming a stationary core, a movable valve (10) having a valve member (15) in a leading end side of a rod portion (101) extending from an enlarged portion (102) forming a movable core, and a seat member (5), and the valve being closed by the urging force of a valve closing spring (16), wherein the rod portion (101) has a sliding hole (103) in a leading end side, the valve member (15) having a valve element (151) is inserted so as to be slidable in an axial direction and is urged by a coil spring (17) on a proximal end side, the urging force when the valve is closed is set weaker than the valve closing spring (16), the valve element (151) closely contacts the valve seat (52) in the state that the valve member (15) is moved backward within the sliding hole (103)by a predetermined amount so as to compress the coil spring (17) when the valve is closed, and the valve element (151) is separated from the valve seat (52) while engaging with the rod portion (101) side by a stopper (152) provided in the rear end side so as to move backward when the valve is opened. |
