Patent ID: 7278594

Claim:
A fuel injector comprising: a core, a valve disposed at a downstream side of the core, the valve having an armature on one end and a hole closing element on the other end, and a solenoid coil for attracting the valve toward the core, wherein an upstream end surface of the armature contacts a downstream end surface of the core when the solenoid coil is excited, wherein the hole closing element closes a fuel injection hole of a valve seat when the solenoid coil is not excited, and wherein at least one of the upstream end surface of the armature and the downstream end surface of the core is plated with a plating layer, the thickness of the plating layer varies in a radial direction, and the upstream end surface of the armature and the downstream end surface of the core are made to be approximately parallel without the plating, and wherein the plating layer is thicker at an inner circumference side.