Patent ID: 7819379

Claim:
A method of attaching an armature ( 16 ) to a valve needle ( 14 ) in a control valve ( 10 ) of the type that can be used in a fuel injector comprising: providing a valve body ( 12 ) having a bore ( 18 ), a planar face ( 32 ), and an annular chamfer ( 34 , 60 , 70 ) in the planar face around the bore; inserting into the bore ( 18 ) a valve needle ( 14 ) having a shank ( 28 ), a stem ( 26 ), and an annulus ( 30 , 50 , 62 ) between the shank and the stem; placing over the stem an armature ( 16 ) having an annular flat ( 40 ) facing the planar face ( 32 ) and an annular shoulder ( 44 ) extending from the annular flat; and pressing the armature ( 16 ) toward the valve body ( 12 ) while the annular shoulder ( 44 ) bears against the chamfer ( 34 ) and deforms into the annulus ( 30 ) until the annular flat is stopped by the planar face ( 32 ).