Abstract: A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, has a valve needle which cooperates with a valve-seat surface to form a sealing seat, and an armature which is connected to the valve needle, the armature being acted upon in the closing direction by a restoring spring and cooperating with a magnetic coil. The armature has a guide flange which is guided at an opposite surface. The guide flange does contact the opposite surface in all places, so that recesses are formed between the guide flange and the opposite surface.

Abstract: A fuel injector, especially for directly injecting fuel into a combustion chamber of an internal combustion engine, having a valve needle which, at its spray-discharge end, has a valve-closure member that cooperates with a valve-seat surface formed on a valve-seat member to form a sealing seat, and having at least one spray orifice provided downstream from the sealing seat, and an armature that acts on the valve needle. The armature is positioned so as to be axially movable on the valve needle between a first limiting stop situated on the valve needle and a second limiting stop, and is hydraulically damped at the first limiting stop by a pressure medium.

Abstract: A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, has a valve needle which cooperates with a valve-seat surface to form a sealing seat, and an armature which is connected to the valve needle, the armature being acted upon in the closing direction by a restoring spring and cooperating with a magnetic coil. The armature has a guide flange which is guided at an opposite surface. The guide flange does contact the opposite surface in all places, so that recesses are formed between the guide flange and the opposite surface.

Abstract: A fuel injector includes a magnetic coil, which cooperates with an armature which, together with a valve needle acted upon by a restoring spring, forms an axially movable valve part. A valve-closure member which forms a sealing seat together with a valve-seat member, is provided at the valve needle. Furthermore, the fuel injector includes an inner pole and an outer pole which form a magnetic circuit together with the magnetic coil, and a central fuel supply. A sleeve is situated in the central fuel supply of the fuel injector in such a way that a flow route of the fuel through the fuel injector is formed such with respect to length and diameter that the frequency of natural oscillations which are excited by the fuel flowing through the fuel injector, is adjusted to the closing intervals of the fuel injector.

Abstract: A fuel injector (1) includes a magnetic coil (10), which cooperates with an armature (20) which, together with a valve needle (3) acted upon by a restoring spring (23), forms an axially movable valve part. A valve-closure member (4) which forms a sealing seat together with a valve-seat member (5), is provided at the valve needle (3). Furthermore, the fuel injector (1) includes an inner pole (13) and an outer pole (9) which form a magnetic circuit together with the magnetic coil (10), and a central fuel supply (16). A sleeve (21) is situated in the central fuel supply (16) of the fuel injector (1) in such a way that a flow route of the fuel through the fuel injector (1) is formed such with respect to length and diameter that the frequency of natural oscillations which are excited by the fuel flowing through the fuel injector (1), is adjusted to the closing intervals of the fuel injector (1).