Theinjection nozzleconsists of the nozzle body the cone of which protrudes into the combustion chamber. The injection orifices through which the fuel is injected are bored in the
nozzle cone. The number, configuration, length and diameter of these injection orifices permit the shape of the injection spray to be formed in a way that is ideally matched to the engine
cylinder.
Inside the nozzle body is the nozzle needle which, when closed, blocks the injection orifices. Forfuel injection, the nozzle needle is raised by the hydraulic servo system of theinjectorso that the injection orifices are opened. The faster the nozzle needle can be opened and re-closed, the more precisely the injection rate can be controlled.
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