Double switching valve for fuel injection systems

Pump/nozzle unit comprises a pump part, a nozzle part, an actuator (5), and a hydraulic coupling device (38) located downstream of the actuator and via which a valve needle (24) of a 2/2-way valve within a nozzle body (23) is operated. The actuator has a piezo crystal arrangement (7) acting on the h...

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Bibliographische Detailangaben
1. Verfasser:	SPP, STEFAN
Format:	Patent
Sprache:	eng ; fre ; ger
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:	Pump/nozzle unit comprises a pump part, a nozzle part, an actuator (5), and a hydraulic coupling device (38) located downstream of the actuator and via which a valve needle (24) of a 2/2-way valve within a nozzle body (23) is operated. The actuator has a piezo crystal arrangement (7) acting on the hydraulic coupling device and impinging on an end face (40) of the valve needle which is adjusted into a first position (41) allowing a pressure increase. A further position of the valve needle allowing opening of a nozzle needle (29) is independently adjusted. Preferred Features: The hydraulic coupling device changes in the nozzle body into a needle guide (44) guiding the valve needle.