Patent ID: 9719471
Date: 2017-08-01
CPC Classifications: F02M

Claim:
1. A fuel injection valve for internal combustion engines, the fuel injection valve comprising a nozzle body ( 1 ) having a pressure chamber ( 3 ) formed therein, wherein the pressure chamber ( 3 ) is configured to be charged with fuel at high pressure, and wherein a piston-like nozzle needle ( 5 ) is arranged in longitudinally displaceable fashion in the pressure chamber, which nozzle needle, by way of a sealing surface ( 6 ) formed on a combustion chamber-side end of the nozzle needle, interacts with a nozzle seat ( 7 ) formed in the nozzle body ( 1 ) and thereby controls a flow of fuel from the pressure chamber ( 3 ) to at least one injection opening ( 8 ), and the fuel injection valve comprising a sleeve ( 12 ) which receives an end of the nozzle needle ( 5 ) remote from the nozzle seat, which sleeve delimits a control chamber ( 20 ), a pressure of which exerts a hydraulic force on the nozzle needle ( 5 ) in a direction of the nozzle seat ( 7 ), characterized in that, in the control chamber ( 20 ), there is a closing spring ( 16 ) which is under compressive preload between the sleeve ( 12 ) and the nozzle needle ( 5 ); wherein the closing spring ( wherein the force of the closing spring ( wherein the closing spring is under compressive preload between a shoulder ( wherein the sleeve (