Patent ID: 7946509

Claim:
An injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising: an actuator actuating the injector; a fuel inlet communicating with the injector and delivering fuel at system pressure; at least one injection opening being opened or closed by an injection valve member; and a control piston triggering the injection valve member via a control chamber, to which a respective pressure face of the control piston and of a piston portion of the injection valve member are each exposed, wherein the control piston is a valve piston of a control valve, the respective pressure face of the control piston and of the piston portion of the injection valve member define the control chamber on a same side, and the control piston and the piston portion of the injection valve member surround a further control chamber, which when the control valve is open the further control chamber communicates with a fuel return and when the control valve is closed the further control chamber communicates with the fuel inlet.