Patent ID: 7086606

Claim:
A modular fuel injector comprising: a power group subassembly including: a housing encasing an electromagnetic coil; and an overmold surrounding the coil and the housing; a valve group subassembly including: a first stator member that defines a fluid passage extending along a longitudinal axis; a second stator member; a non-magnetic shell disposed between the first and second stator members; a valve body coupled to the second stator member, the valve body including a securement that secures the valve body to the coil housing; an armature member disposed in the valve body, the armature member being coupled to a closure member and movable with respect to the first and second stator members between a first configuration with a closure member contiguous to a seat in the first configuration and spaced from the seat in the second configuration, the armature member having an armature surface with at least a portion contiguous to a plane intersecting the longitudinal axis, a first portion of the armature surface confronting the first stator member to define a first working gap from the armature surface to the first stator member along the longitudinal axis, and a second portion of the armature surface confronting the second stator member to define a second working gap from the armature surface to the second stator member along the longitudinal axis; wherein the first working air gap having a first length in the direction of the longitudinal axis, the second working air gap having a second length in the direction of the longitudinal axis, and one of the first and second lengths is greater than the other of the first and second lengths.