Patent ID: 6892703

Claim:
A device for injecting fuel into the combustion chamber ( 7 ) of an internal combustion engine, comprising a high-pressure source ( 2 ), a pressure booster ( 5 ) including a compression chamber ( 15 ), a metering valve ( 6 ), the pressure booster ( 5 ) including a work chamber ( 10 ) and a control chamber ( 11 ) which are separated from one another by a movable piston ( 12 ; 13 , 14 ), a change in pressure in the control chamber ( 11 ) of the pressure booster ( 5 ) causing a change in pressure in the compression chamber ( 15 ) of the pressure booster ( 5 ) via an inlet ( 21 ) which acts upon a nozzle chamber ( 22 ) surrounding an injection valve member ( 26 ), and a pressure relief valve ( 40 ) with a valve body ( 43 , 54 ) disposed in a control line ( 20 , 49 ) between the control chamber ( 11 ) of the pressure booster ( 5 ) and the metering valve ( 6 ), the metering valve controlling fluid pressure acting upon at least one hydraulic chamber ( 41 , 42 ) of the pressure relief valve ( 40 ), to thereby allow said chamber to communicate with the pressure prevailing in the high-pressure storage chamber ( 2 ).