Double tube vibration damper unit

US5441132A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Robert Pradel · Schweinfurt, DE
• Stefan Schiffler · Schonungen, DE

Key dates

• Filing date: Sep 9, 1993
• Grant date: Aug 15, 1995
• Expiry date: Sep 9, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F2222/02
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A double tube vibration damper comprises a pressure tube and a container tube. Two working chambers are defined by the piston within the pressure tube. A compensation space is provided between the pressure tube and the container tube. The pressure tube extends axially between a bottom wall of the container tube and a piston rod guide secured to the container tube. A spring is in series with the pressure tube between the bottom wall and the piston rod guide. This spring compensates for different length variations of the pressure tube and the container tube. This spring is always under compressional stress throughout the operational range of temperature.