Patent ID: 8418941

Claim:
An injector for a fuel injection system of an internal combustion engine, the injector comprising: an injector body that has a pressure booster section and a needle section, with at least one injection orifice provided in the needle section; a nozzle needle that is situated to execute a stroke motion in the needle section in order to control an injection of fuel through the at least one injection orifice; and a pressure booster for increasing a fuel injection pressure in relation to a system pressure, the pressure booster having a stepped piston, a control rod, and a pressure booster bottom, which cooperate with one another to delimit a coupler chamber, wherein a coupling path extends in the control rod and connects the coupler chamber to a high-pressure fuel supply via a valve device situated outside or inside the injector, wherein the pressure booster bottom is separate from the stepped piston and the stepped piston is movable relative to the pressure booster bottom, and wherein the piston defines an interior space, the pressure booster bottom extends upward into the space, and the control rod extends downward into the space.