Double-switching valve for fuel injection system

The invention relates to a unit injector for injecting fuel into the combustion chamber of a self-igniting internal combustion engine, including a pump part a nozzle part and an final control element that is followed downstream by a hydraulic coupler which actuates a valve needle of a 2/2-way valve...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	SPP STEFAN
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a unit injector for injecting fuel into the combustion chamber of a self-igniting internal combustion engine, including a pump part a nozzle part and an final control element that is followed downstream by a hydraulic coupler which actuates a valve needle of a 2/2-way valve inside a nozzle body. The final control element includes a piezoelectric crystal array. The hydraulic coupler acts on the face end of the valve needle in such a way that it can be put into a first position that enables a pressure buildup, and a further position of the valve needle that enables the opening of a nozzle needle, with the pressure buildup and the valve opening being separately adjustable.