Patent ID: 6866210

Claim:
A fuel injector for a fuel injection system of an internal combustion engine, the fuel injector having a central axis and comprising: a valve needle; a valve-seat member including a recess and at least one spray discharge opening; a valve-seat surface positioned in the recess of the valve-seat member; a valve-closure member having a contiguous contour, the valve-closure member being in working engagement with the valve needle and coacting with the valve-seat surface to form a sealing seat; a second surface positioned between the valve-seat surface and the spray discharge opening, the second surface forming a first angle with respect to the central axis of the fuel injector; and a closure element extension having an enveloping surface and positioned at a downstream end of the valve-closure member, the enveloping surface forming an obtuse angle with the contiguous contour of the valve-closure member; wherein the first angle is more acute than an angle formed between the valve-seat surface and the center axis of the fuel injector; wherein the closure element extension has a greater radial extent than the at least one spray discharge opening; and wherein a prolongation application of the enveloping surface of the closure element extension in the downstream direction forms, with the valve-seat member, an intersection line lying entirely on the second surface of the valve-seat member.