Patent ID: 6698664
Filing Date: 2004-03-02
Classification: F02M

Abstract:
A fuel injector for use with an internal combustion engine, the fuel injector comprising:a valve group subassembly that is independently operable and testable prior to being assembled in a fuel injector, the valve group subassembly including: a tube assembly having a longitudinal axis extending between a first end and a second end, the tube assembly including: an inlet tube having a first inlet tube end and a second inlet tube end; a non-magnetic shell having a first shell end connected to the second inlet tube end at a first connection and further having a second shell end; and a valve body having a first valve body end connected to the second shell end at a second connection and further having a second valve body end; a seat secured at the second end of the tube assembly, the seat defining an opening; an armature assembly disposed within the tube assembly; a member biasing the armature assembly toward the seat; a filter assembly located in the tube assembly, the filter assembly engaging the member and adjusting a biasing force of the member; and a first attaching portion; and a coil group subassembly that is independently operable and testable prior to being assembled in a fuel injector, the coil group subassembly including: a solenoid coil operable to displace the armature assembly with respect to the seat, the solenoid coil including a bobbin and a coil housing, the bobbin surrounding a coil and having an interior surface spaced at a first distance to and exposed to the longitudinal axis, the coil housing including an interior surface spaced at a second distance to and exposed to the longitudinal axis such that the second distance is generally equal to the first distance; and a second attaching portion fixedly connected to the first attaching portion.