FUEL INJECTION VALVE

摘要

PROBLEM TO BE SOLVED: To suppress the bound of a needle in both opening/closing a fuel injection valve. SOLUTION: The fuel injection valve 1 includes: bodies B1-B6 formed with a nozzle port 12 in an end; a nozzle needle 10 arranged in the bodies B1-B6 and opening/closing the nozzle port 12; a magnetic circuit 70 driving the nozzle needle 10 for opening/closing; a disc-shaped portion 30 formed by radially enlarging a part of the shaft portion of the nozzle needle 10; a first ring 40 opposed to the end-side surface of the disc-shaped portion 30 to sandwich damping liquid; and a second ring 50 opposed to the base end-side surface of the disc-shaped portion 30 to sandwich the damping liquid. The disc-shaped portion 30 and first ring 40 maintain such a distance that the sandwiched damping liquid generates drag toward a base end side. The disc-shaped portion 30 and second ring 50 maintain such a distance that the sandwiched damping liquid generates drag toward an end side. COPYRIGHT: (C)2011,JPO&INPIT