| 摘要 |
<p>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. The hollow nozzle needle, at that end facing the spray hole or holes, has an inclined shoulder, the external surface of which forms a valve seat for the hollow needle, and the internal surface of which forms a valve seat for the second nozzle needle.</p> |
