Vibration damper, in particular for motor vehicles

US5632361A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Gunther Wulff · Stein am Rhein, CH
• Achim Thoma · Bergrheinfeld, DE
• Gunther Reusing · Niederwerrn, DE
• Stefan Irmscher · Niederwerrn, DE
• Wolfgang Herdeg · Rutesheim, DE

Key dates

• Filing date: Sep 14, 1995
• Grant date: May 27, 1997
• Expiry date: Sep 14, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/535
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Vibration damper, in particular for motor vehicles, including a work cylinder, a work piston fastened to a piston rod and dividing the work cylinder into two work chambers, possibly an equalization chamber and a piston rod guide which seals the piston rod against the atmosphere, whereby the work chambers are filled with a magnetorheological fluid to which an electric coil can be applied. In the event of a failure or malfunction of the electric coil, it must be possible to achieve a safe damping force, by having at least one permanent magnetic field which acts on the magnetorheological fluid.