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AssigneeSiemens Aktiengesellschaft
InventorsAndreas Fath, Günter Lewentz, Wilhelm Frank, Eberhard Kull, Hakan Yalcin, Wendelin Klügl
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The nozzle body (5) of a fuel injection valve has a central bore (54) in which a nozzle needle (1) is guided. The tip (52) of the nozzle body (5) has a tapered valve seat (55) which forms together with the sealing edge (27) of the nozzle needle (1) a valve (27, 55) which controls the flow of fuel to the injection holes (9) in the nozzle tip (52). Underneath the sealing edge (27) a circumferential groove (33) is disposed in the truncatoconical needle tip (30, 35, 40, 45) at the level of which the injection holes (9) are disposed, so that when the valve (27, 55) opens the nozzle needle (1) is axially stabilized and the shaping of the injected jet is improved.
Fuel injection valve with a nozzle needle (1) which is guided in a central guiding bore (54) of a nozzle body (5) and has only one circumferential sealing area (28) including a sealing surface (29) and a sealing edge 27 which forms together with a valve seat (55) of the nozzle body (5) a valve (27,55) which is opened or closed depending on the position of the nozzle needle (1) and controls fuel flow to at least one injection hole (9) in a nozzle tip (52) of the nozzle body (5), characterized in that the nozzle needle (1) has a circumferential groove (33) between the sealing area (28) and a needle tip (45) of the nozzle needle (1), the groove (33) is defined by first and the second groove sections (35,40) of the nozzle needle (1) enclosing a second angle (a2) which lies in the range between 125 and 155 degrees, and a hole axis (90) of the injection hole (9) enters into the groove (33) whenever the sealing edge (27) of the nozzle needle (1) lies on the valve seat (55).
Dependencies are inferred from the claim text.