Patent ID: 7992810

Claim:
A fuel injector with a coupler for transmitting a reciprocating motion of an actuator to an injection valve member that is embodied in particular in needle-like form and is guided in a nozzle body, and the coupler having a valve piston and a coupler sleeve, and the injection valve member having an outside diameter, and the coupler sleeve having an inside diameter, the valve piston being guided in the inside diameter of the coupler sleeve, wherein the inside diameter of the coupler sleeve is greater than the outside diameter of the injection valve member by at most a difference of 0.2 mm wherein on the valve piston of the coupler, a transitional region is embodied, inside which the diameter of the valve piston changes over to a diameter that is equivalent to the diameter of a bore, which is embodied in the nozzle body and in which the injection valve member is guided with its outside diameter.