Valve for the dosed discharge of fluids

US5931390A · kind A · utility

Assignees

• Daimler-Benz AG · DE
• P&S Prolotypen und Sondermaschinen GmbH · DE

Inventors

• Karl-Heinz Hoffmann · Rommerskirchen, DE
• Gregor Renner · Stuttgart, DE
• Friedrich Wirbeleit · Eßlingen, DE
• Jens-Peter Wobbe · Simmertal, DE

Key dates

• Filing date: Jan 15, 1998
• Grant date: Aug 3, 1999
• Expiry date: Jan 15, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a valve for the dosed discharge of fluids particularly a fuel injection valve for fuel injection systems of internal combustion engines, the valve includes in an valve housing at the front end of an injector housing a valve structure at a fluid discharge end of the valve housing and a stack of piezo elements disposed in the opposite end of the injector housing and a high pressure fluid passages leads to the fluid discharge end which is isolated from the area in which the stack of piezo elements is disposed and which is in communication with a low pressure drain passage such that the piezo elements are not exposed to the high pressure fluid. Isolation is obtained by a compensation cylinder movably disposed in an annular space between, and in sealing relationship with, the valve housing, the piezo stack being enclosed in a piezo guide tube which is sealingly connected to the valve housing.