Patent ID: 7552880

Claim:
A fuel injector comprising: a housing having a passageway extending between an inlet and an outlet along a longitudinal axis, and an armature disposed within the housing, the housing including: a tubular member proximate the inlet, the tubular member having a first tubular member end and a second tubular member end, the second end of the tubular member having an end face confronting an end face of the armature, a portion of the armature coated with one of a hard chromium plating, nickel plating or keronite coating; a body proximate the outlet, the body having a first body end and a second body end; a generally spherical closure member directly coupled to a hollow armature tube of the armature, the armature comprising the hollow armature tube and a distinct magnetic portion separate from and coupled to the hollow armature tube, the magnetic portion adapted to contact and constrain a biasing spring that is adapted to urge the generally spherical closure member to close a seat orifice of a seat, an aperture formed on the hollow armature tube adapted, to allow fuel to flow to the generally spherical closure member; and a connector member affixed to the second tubular member end and the first body end, the connector member including a first wall portion circumscribing the longitudinal axis to define a first volume, an intermediate wall portion connecting the first wall portion to a second wall portion, the second wall portion circumscribing the longitudinal axis to define a second volume of at least 1.1 times the first volume, the connector member connected to the tubular member and to the body via a press-fit arrangement; wherein the first wall portion, the intermediate wall portion and the second wall portion each have substantially the same thickness and are formed by a deep drawing process wherein the second volume comprises a volume of about 1.8 times the first volume such that an increased second volume assists in controlling reciprocating motion of said armature; and wherein the first wall portion comprises a first inner wall surface extending about 3.1 millimeters along the longitudinal axis such that an electromagnetic force increases as a result of a shortened magnetic flux path.