Abstract: A fuel injector for air-compressing, direct-injection internal combustion engines. The injector essentially comprises a nozzle body, a hollow nozzle needle which is axially displaceable therein, and a second nozzle needle which is displaceable within said hollow nozzle needle. The two nozzle needles are controlled in such a way that in the lower speed and/or load range of the internal combustion engine, initially only one nozzle needle opens to release one or some of the spray holes, while the full fuel injection, which may be in different directions, occurs only at full load by opening the other nozzle needle. One of the spray holes is coaxial with the longitudinal axis of the injector, and in the closed and partly opened state of the injector, a pin of the second nozzle needle extends into this hole with clearance.

Abstract: A multi-hole injection nozzle for air-compressing direct-injection internal combustion engines includes a first nozzle needle which is hollow, and a second nozzle needle which is axially slidable in an axial bore of the first needle. The first needle can close one or more nozzle holes which are spaced from the tip of the injection nozzle and the second needle can similarly close one or more nozzle holes which are, however, close to the tip and which have respectively different cross-sectional areas.