Patent ID: 7926737

Claim:
A fuel injector for an internal combustion engine, comprising: an injection valve element having a nozzle needle guided in an axially movable fashion within a nozzle body; a nozzle-needle-side coupler piston connected to the nozzle needle, which acts on a control chamber; an actuator disposed in an injector housing; an actuator-side coupler piston connected to the actuator, which acts on a coupler chamber either to relieve pressure in it or exert pressure on it; and an intermediate disk disposed between the injector housing and the nozzle body having a conduit which hydraulically connects the coupler chamber to the control chamber, the conduit containing a hydraulic throttle which has at least two sections with different flow cross sections, where a first section with a smaller flow cross section is oriented toward the coupler chamber and a second section with a larger flow cross section is oriented toward the control chamber, and wherein the first section is preceded by a third section within the throttle on the side oriented toward the coupler chamber and the second section is preceded by a fourth section within the throttle on the side oriented toward the control chamber, the third and fourth sections having essentially the same flow cross section, which is in turn greater than the larger flow cross section of the second section.