Patent ID: 7100847

Claim:
A fuel injection valve for internal combustion engines comprising a valve body ( 1 ) having a longitudinal bore ( 3 ) formed therein a valve needle ( 5 ) having a longitudinal axis ( 15 ) mounted for sliding movement in the longitudinal direction inside the bore ( 3 ), a conical valve seat ( 11 ) formed on the combustion chamber end of the bore ( 3 ), a pressure chamber ( 19 ) formed between a section of the valve needle ( 5 ) and the wall of the bore ( 3 ) and extending to the valve seat ( 11 ), which pressure chamber can be filled with fuel, a valve sealing surface ( 7 ) embodied on the valve needle ( 5 ), which sealing surface cooperates with the valve seat ( 11 ) in order to control at least one injection opening leading from the valve seat ( 11 ), an annular groove ( 35 ) formed in the sealing surface ( 7 ) and extending in a radial plane of the valve needle ( 5 ), the downstream edge of the annular groove ( 35 ) being embodied as a sealing edge ( 38 ), means hydraulically connecting the annular groove ( 35 ) to the pressure chamber ( 19 ) on a continuous basis, wherein the valve sealing surface ( 7 ) comprises a first conical surface ( 30 ) and a second conical surface ( 32 ) disposed downstream of the first, with the annular groove ( 35 ) extending between them, and wherein the opening angle of the first conical surface ( 30 ) is smaller than the opening angle of the conical valve seat ( 11 ) and the opening angle of the second conical surface ( 32 ) is greater than the opening angle of the conical valve seat ( 11 ).