Siemens Aktiengesellschaft

Man B&w Diesel Aktiengesellschaft

Hakan Yalcin

G&uuml;nter Lewentz

Eberhard Kull

Andreas Fath

Wilhelm Frank

Andreas Voigt

Wendelin Kl&uuml;gl

Alwin Perras

Olaf Enke

Günter Lewentz

Andrej Astachow

Dirk Köthen

Gertrud Meggenrieder

Dietmar Pinkernell

Andreas Stichnoth

Disclosed is a fuel injection nozzle comprising a cooling duct () that is disposed in the final region of a housing (), which faces the combustion chamber. In order to cool the zones that are subjected to high thermal stress, the cooling duct () is positioned closer to the bore () of the valve needle than to the external face of the housing () and is provided with a cross-sectional area that has a width corresponding to no more than the height which extends in the axial direction of the nozzle.

Fuel injection nozzle

The injection valve has a housing, a nozzle body and a clamping nut connected to the housing that contacts the nozzle body with first contact surface () acting on a second contact surface (), whereby the clamping nut clamps the nozzle body against the housing. The first or second contact surface has a curvature () towards the second or first contact surface and the both contact surfaces are in contact in the area of the curvature.

Injection valve comprising an optimized surface geometry between a nozzle body and a retaining nut

The injection valve has a housing, a nozzle body and a clamping nut connected to the housing that contacts the nozzle body with first contact surface ( ) acting on a second contact surface ( ), whereby the clamping nut clamps the nozzle body against the housing. The first or second contact surface has a curvature ( ) towards the second or first contact surface and the both contact surfaces are in contact in the area of the curvature.

Located between the frustoconical needle tip and the cylindrical needle shank of a nozzle needle of a fuel injection valve is a frustoconical needle portion, into which is introduced a peripheral groove. Through this kind of arrangement damping is capable of being set, depending on the position of the groove, during the axial movement of the nozzle needle.

Fuel injection valve for a combustion engine

The nozzle body ( ) of a fuel injection valve has a central bore ( ) in which a nozzle needle ( ) is guided. The tip ( ) of the nozzle body ( ) has a tapered valve seat ( ) which forms together with the sealing edge ( ) of the nozzle needle ( ) a valve ( ) which controls the flow of fuel to the injection holes ( ) in the nozzle tip ( ). Underneath the sealing edge ( ) a circumferential groove ( ) is disposed in the truncatoconical needle tip ( ) at the level of which the injection holes ( ) are disposed, so that when the valve ( ) opens the nozzle needle ( ) is axially stabilized and the shaping of the injected jet is improved.

Fuel injection valve for an internal combustion engine

In a nozzle body, a degree of rounding of edges of an entry region of an injection hole duct in the nozzle body is dependent on a distribution of a fuel stream around the entry region. The edges being more rounded, the greater the fuel stream at the respective edge portion is. The entry region of the injection hole duct has, in this case, preferably the form of an ellipse.

Nozzle body for a fuel injection nozzle with optimized injection hole duct geometry

Fuel injection valve with a nozzle body ( ) which has a central guiding bore ( ) and, laterally of the guiding bore ( ), a fuel inlet passage ( ), both leading into a pressure chamber ( ), and between them a dividing wall ( ) with a very thin wall section. The nozzle body ( ) has at its held end a step whereby the fuel inlet passage ( ) runs more steeply into the pressure chamber and thus the wall thickness is greater. Thus a greater pressure resistant strength is achieved in the nozzle body.

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Wuppertal, Germany

Hakan Yalcin