Fuel injector having improved parallelism of impacting armature surface to impacted stop surface

In an electrically operated fuel injector having a valve group and a power group, the power group comprising:

• a coil assembly for generating electromagnetic forces;
• a magnetic tubular stator having one end adapted for receiving fuel into the injector and forming a passageway for conducting fuel through said power group and out said other end to the valve group, said stator having a tubular neck at the other end of said stator juxtaposed said armature, said stator mounting said coil assembly;
• a stepped non-magnetic shell having a tubular neck with a first inner diameter equal to said tubular neck inner diameter of said stator and telescopically fitted therein and a first outer diameter equal to the outer diameter of said stator, said shell having an axially extending first circular rim connected to said first outer diameter by means of a shoulder radially extending from said first outer diameter;
• a magnetic tubular first valve body means axially extending from said first circular rim, said valve body means having a second circular rim at the end adjacent said circular rim of said shell terminating in a shoulder radially extending toward the axis of said tubular body for overlapping said first circular rim of said shell
• a magnetic second valve body means operative connected to the valve group and located in said first valve body means and encircling said armature, said second valve body means including a non-magnetic armature guide means;
• hermetic weld means for forming said stator, said shell, said first body means and said second body means into an unitary structure, wherein said one end of said armature is parallel to the other end of said stator;
• and
• said armature guide means being axially displaced in the direction of said second valve body means from said overlapping shell and first body means.