Patent ID: 7484673

Claim:
A fuel injector for an internal combustion engine, comprising: a nozzle needle that opens or closes at least one injection opening; a step-shaped widening on the nozzle needle disposed at an end of the nozzle needle oriented away from the at least one injection opening, the step-shaped widening forming an end surface oriented toward the at least one injection opening; a first booster and a second booster each having an end surface oriented toward the at least one injection opening, wherein the second booster encompasses the first booster; a control chamber delimited collectively by the end surfaces of the first booster and the second booster which end surfaces are exposed to the control chamber and by the end surface of the step-shaped widening of the nozzle needle which end surface is exposed to the control chamber; and an actuator which moves the first booster and the second booster into or out of the control chamber.