Patent ID: 6851622
Filing Date: 2005-02-08
Classification: F02M,H01F,Y10S

Abstract:
1. A fuel injector for use with an internal combustion engine, the fuel injector comprising: a tube assembly having a longitudinal axis and including: an armature assembly disposed within the tube assembly between the pole piece and the first end, the armature assembly including an end face resiliently biased away from the pole piece; a working air gap separating the end face and the pole piece when the end face is biased away from the pole piece; a coil connectable to an electrical power source and operable to displace the end face toward the pole piece against the resilient bias on the armature assembly; and a housing positioned adjacent the working air gap and supporting the coil on the tube assembly, the housing extending around the coil and having a ferromagnetic inner wall extending between the coil and the non-magnetic tube, the ferromagnetic inner wall has an opening with a width that is substantially less than the length of the coil as measured parallel to the longitudinal axis.