Patent ID: 7066147

Claim:
A fuel injection device for internal combustion engines, with a fuel injector that can be supplied by a high-pressure fuel source, comprising a pressure intensifying device having a movable piston is connected between the fuel injector and the high-pressure fuel source, a first chamber connected to the high-pressure fuel source separated by the movable piston from a high-pressure chamber connected to the injector, the fuel pressure in the high-pressure chamber being variable by filling a return chamber of the pressure intensifying device with fuel or by emptying fuel from the return chamber, and a valve ( 50 ; 70 ) containing a movably supported valve body ( 51 ; 78 ), the valve ( 50 ; 70 ) being operable to connect ( 56 , 53 , 52 ; 76 , 86 , 88 , 72 ) the high-pressure chamber ( 40 ) to the first chamber ( 35 ) and to connect ( 55 , 53 , 52 ; 74 , 88 , 72 ) the return chamber ( 38 ) to the first chamber ( 35 ).