Patent ID: 7461795

Claim:
A fuel injection system for internal combustion engines, comprising a fuel injection nozzle ( 2 ), which can be supplied with fuel by a high-pressure fuel source ( 1 ), the fuel injection nozzle ( 2 ) having a movable nozzle piston ( 3 ) for opening and closing injection openings ( 6 ), an injection nozzle high-pressure chamber ( 21 ), an injection nozzle control chamber ( 20 ), and a closing spring located within the control chamber ( 20 ) for biasing the nozzle piston ( 3 ) in a direction to close the injection openings ( 6 ), a pressure boosting device ( 7 ) is connected between the fuel injection nozzle ( 2 ) and the high-pressure fuel source ( 1 ), the pressure boosting device ( 7 ) having a movable pressure booster piston ( 8 ), a pressure booster work chamber ( 11 ), and a pressure booster high-pressure chamber ( 9 ), and a filling connection ( 10 ) which is open for filling the pressure booster high-pressure chamber ( 9 ) when the fuel injection nozzle ( 2 ) is closed and is itself closed by the nozzle piston ( 3 ) when the fuel injection nozzle ( 2 ) is open, said filling connection ( 10 ) including a throttle ( 23 ), wherein closure of the filling connection ( 10 ) is coupled with the motion of the nozzle piston ( 3 ) in the opening direction to uncover the injection openings, and wherein the control chamber ( 20 ) is hydraulically connected to the pressure booster high-pressure chamber ( 9 ) by the filling connection ( 10 ).