Patent ID: 8020789
Filing Date: 2011-09-20
Classification: F02M,Y10T

Abstract:
1. A fuel injector for a fuel injection system of an internal combustion engine, comprising: a solenoid coil; an armature acted upon in a closing direction by a restoring spring; and a valve needle, which is connected to the armature by force-locking and at which a valve-closure member is formed, which forms a sealing seat together with a valve-needle surface, the armature facing and striking against a stop face of an inner pole of the solenoid coil by way of an armature stop face, wherein both the armature stop face and the stop face of the inner pole have the same coating, the coating being deposited on the armature stop face and on the stop face of the inner pole in a plurality of chromium layers, the coating having a surface structure with raised areas and recessed areas, wherein the raised areas have a dome-shaped design and the height difference between the raised areas and recessed areas is initially between 5 μm and 10 μm and is reduced to between 4 μm and 5 μm during use of the fuel injector.