Patent ID: 7128280

Claim:
In an injection nozzle ( 1 ) for internal combustion engines, which has at least one injection orifice ( 3 ), a nozzle needle seat ( 4 ), and a nozzle needle ( 5 ), the improvement wherein the end of the nozzle needle ( 5 ) oriented toward the nozzle needle seat ( 4 ) is a cone and has an annular groove ( 8 ), wherein a blind hole ( 2 ) adjoins the nozzle needle seat ( 4 ) and has the at least one injection orifice ( 3 ), and wherein the blind hole ( 2 ) is conical wherein when the injection nozzle ( 1 ) is closed, the distance of the transition ( 7 ) between the blind hole ( 2 ) and the nozzle seat ( 4 ) from the bottom ( 9 ) of the injection nozzle ( 1 ) and the distance of the annular groove ( 8 ) from the bottom ( 9 ) of the injection nozzle ( 1 ) are essentially equal, and wherein the width of the annular groove ( 8 ) is approximately 0.1 mm to 0.3 mm.