Patent ID: 7635093

Claim:
A fuel injector comprising: a housing; a valve needle having a valve-closure member that is situated in the housing; one of a piezoelectric and magnetostrictive actuator, excitable via at least one electrical line, for actuating the valve-closure member; a valve-seat surface, the valve-closure member cooperating with the valve-seat surface to form a sealing seat; and a hydraulic coupler including a master piston and a slave piston and fixedly situated between the actuator and a valve-subassembly which includes the valve needle, the valve-closure member and the valve-seat surface; wherein the actuator is braced on an actuator foot via an inflow-side end, the actuator foot is rigidly connected to the housing, and the actuator is braced on an actuator head via a discharge-side end; wherein the hydraulic coupler is supported on the valve needle so as to be pivotable, using a calotte, the calotte being operatively connected to the valve needle via an actuating element and engaging with a depression in the slave piston.