Patent ID: 6889659

Claim:
In a fuel injector for injecting fuel into a combustion chamber ( 46 ) of an internal combustion engine, including a pressure booster ( 3 ) whose booster piston ( 4 ) divides a work chamber ( 5 ), acted upon permanently by fuel via a pressure source ( 1 , 2 ), from a pressure-relievable differential pressure chamber ( 6 ), wherein a pressure change in the differential pressure chamber ( 6 ) is effected via an actuation of a servo valve ( 22 ) whose control chamber ( 36 ) can be pressure-relieved via a relief valve ( 33 ) and which opens or closes a hydraulic connection ( 21 , 29 , 35 ) of the differential pressure chamber ( 6 ) with a return ( 34 ), the improvement wherein, for closing the servo valve piston ( 23 , 43 ), the control chamber ( 36 ) acted is upon by a fuel volume diverted from the differential pressure chamber ( 6 ), and its being acted upon by fuel is effected via at least one line ( 23 . 1 , 21 ) that contains a throttle restriction ( 24 , 44 ), and its pressure relief is effected via a relief valve ( 33 ) into a return ( 32 ) on the low-pressure side.