Patent ID: 6247655
Filing Date: 2001-06-19
Classification: F02M

Abstract:
A fuel injection valve for internal combustion engines, comprising a valve member (5) having a valve member shank which is guided axially displaceably in a bore (3) of a valve body (1) and which has, at one end on a combustion space side, a conical valve sealing face (7), said conical valve sealing face cooperates with a conical valve seat face (9) at an end of the bore (3) located on the combustion space side, a blind hole (21) adjoining said bore on the combustion space side, with a pressure space (15) that opens onto the valve seat (9) and which is located between said valve member shank and the wall of the bore (3), at least one injection duct (23) which leads off from an inner wall of the blind hole, said inner wall being located downstream of the valve seat (9), and of which a hydraulic connection to the pressure space (15) is closed by the valve member (5) and which, at an end of the injection duct (23) on the fuel inlet side, has a rounded end entry region which faces the pressure space (15) having a large radius (RA) and a lower rounded end entry region which faces away from the pressure space having a smaller radius (RB), wherein the rounded, entry space starting tangentially from the inner wall, merges tangentially into the wall of the injection duct (23), and wherein the radius (RA) of the rounded end in the upper entry region is 0.02 to 0.3 times a diameter D of the injection duct (23) and the radius (RB) of the rounded end in the lower entry region is 0.01 to 0.05 times the diameter (D) of the injection duct (23).