Injector for fuel injector systems

US6302333A · kind A · utility

Assignees

• Daimlerchrysler AG · US
• Fa. Erphi-Electronic GmbH · DE
• P&S CO., LTD · US

Inventors

• Karl-Heinz Hoffmann · Rommerskirchen, DE
• Heinz Oeing · Fellbach, DE
• Gregor Renner · Stuttgart, DE
• Reinhard Fischer · Holzkirchen, DE
• Guenter Vogt · Furtwangen, DE
• Jens-Peter Wobbe · Simmertal, DE

Key dates

• Filing date: Apr 19, 1999
• Grant date: Oct 16, 2001
• Expiry date: Apr 19, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/703
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An injector for a fuel injection system is provided with an injector housing in which a piezoelectric stack is located and with a valve housing connected with the injector housing in which a valve closing device with a jet needle is displaceably located. The valve closing device can be actuated by the piezoelectric stack. The valve closing device can be reset by a return device. A hydraulic following amplifier is located between the piezoelectric stack and the jet needle of the valve closing device. The amplifier has a displacement piston actuated by the piezoelectric stack. A control piston located downstream from the displacement piston and increases the displacement travel. A working piston that actuates the jet needle and increases the actuating force.