| 摘要 |
The invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, with a nozzle needle (3). The pressure increase/pressure decrease in the control chamber (2) can be used to actuate this nozzle needle (3) in the injector body (1) between a position that unblocks injection openings and a position that closes injection openings. The leakage oil side of the control chamber (2) can be acted on via a pressure relief line (6) containing an outlet throttle (7) and via a high-pressure side inlet (8) with an inlet throttle (9), which simultaneously acts on a nozzle chamber (15) in the injector body (1) with pressurized fuel. The pressure change in the control chamber (2) of the injector body (1) takes place by means of a first on-off valve (21) and an additional on-off valve (27), wherein the first on-off valve (21) has an initial stroke (33) in the switching direction (32).
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