Abstract: A fuel injector for an internal combustion engine, having a valve member which is axially displaceable in a guide bore of a valve body, has two guide areas with which it is displaceably guided in the guide bore, a first upper guide area being provided on the send of the valve member facing away from the combustion chamber and a second lower guide area being provided in an area of the valve member near the combustion chamber, a lower guide area separating an annular clearance which is formed between the valve member shaft and the wall of the guide bore and is connected to a high-pressure fuel inlet channel is separated from a lower pressure space opening onto the valve seat face when the fuel injector is closed, and opening this connection during the opening stroke movement of the valve member, and having a connecting throttle cross section between the annular clearance and the lower pressure space. This throttle cross section is designed as a throttlebore.

Abstract: A fuel injection valve for internal combustion engines, with a valve member which is guided axially displaceably in a bore of a valve body and which has, at its end on the combustion space side, a conical valve sealing face, the conical valve sealing face cooperates with a conical valve seat face at that end of the bore on the combustion space side. A blind hole or a conical region adjoins said bore on the combustion space side, with a pressure space that opens onto the valve seat and located between the valve member shank and the wall of the bore, and with at least one injection duct which leads from an inner wall of the injection valve. The inner wall being located downstream of the valve seat. To form the injection jet, the entry regions of the injection duct are rounded, an upper entry region which faces the pressure space having a large radius (RA) and a lower entry region which faces away from the pressure space having a smaller radius (RB). At the same time, the size of the radius (RA) is 0.02 to 0.

Abstract: A fuel injection valve for internal combustion engines, with a valve member which is guided axially displaceably in a bore of a valve body and which has, at its end on the combustion space side, a conical valve sealing face, the valve sealing face cooperates with a conical valve seat face at that end of the bore located on the combustion space side, a blind hole or a conical region adjoining said valve seat face on the combustion space side, with a pressure space opening onto the valve seat and located between the valve member shank and the wall of the bore, and with at least one injection duct leading off from an inner wall of the injection valve, said inner wall being located downstream of the valve seat. For forming the injection jet, the entry regions of the injection duct are rounded, an upper entry region which faces the pressure space having a large radius (RA) and a lower entry region which faces away from the pressure space having a smaller radius (RB). Thus, the size of the radius (RA) is 0.75 to 1.