Fuel injector electromagnetic metering valve.

摘要

The valve comprises a shutter (67) for the drain conduit (63) of the control chamber (61) of the injector; and an electromagnet (42) having a fixed core (46) with a seat (48) for a coil (47) which is energized to operate the armature (43) controlling the shutter (67). The core (46) presents two coaxial annular pole pieces (72, 73), the outer one (72) of which is shorter than the inner one (73) and fitted with a ring (76) of magnetic material partially closing the seat (48) and enabling a substantial reduction in the diameter and, hence, the hydraulic resistance and mass of the armature (43). <IMAGE> <IMAGE>