Patent ID: 7387110

Claim:
A common rail injector for injecting fuel into a combustion chamber of an internal combustion engine, having an injector housing including a fuel supply line communicating with a central high-pressure fuel source outside the injector housing and with a pressure chamber inside the injector housing, from which pressure chamber, as a function of the position of a 3/2-way control valve, fuel subjected to high pressure is injected into the combustion chamber, wherein the control valve comprises a valve piston which is movable back and forth in the injector housing between a position of repose and an injection position, wherein the valve piston is coupled hydraulically with a piezoelectric actuator and the valve piston is subjected to the pressure from the high-pressure fuel source, and further comprising a pressure face embodied on the valve piston, the pressure face being subjected constantly to high pressure from the fuel supply line.