Sealing arrangement for injection valves in fuel feed lines

US5927726A · kind A · utility

Inventors

• Manfred Achenbach · Breidenbach, DE
• Peter Krumeich · Stuttgart, DE
• Gerhard Streit · Heilbronn, DE

Key dates

• Filing date: Jan 30, 1997
• Grant date: Jul 27, 1999
• Expiry date: Jan 30, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/858
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A sealing system for connecting a valve for fuel injection in combustion engines to a fuel rail. Prior art systems employ an O-ring as a sealing element seated in an external groove of the valve housing which ends with a groove limiting flange adjacent to a bore in the rail, whereby the O-ring has to seal radially inside (groove bottom) and outside (wall of the hollow to include the valve). The disadvantage of such known systems is that under low temperature operation conditions special material properties of the O-ring are required and that radial external leakage occurs when the material swelling decreases owing to operation stoppage. The present invention results in system leak-tightness even in temperatures below 40.degree. C. and in the case of insufficient material swelling. The present invention is a sealing system in which the radial inner sealing surface of the sealing element is axially expanded and is overlapping to an additional ring surface at the rail producing a sealing contact with the surface and in which the thermal expansion coefficients of the sealing element and the contacted metallic parts behave in such a way relative to each other that the element during coo…