Gas spring

US7628255B2 · kind B2 · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Holger Ansel · Bad Hersfeld, DE
• Meik Broeder · Dachsenhausen, DE
• Stefan Bonnekessel · Berlin, DE
• Stephan Enders · Koblenz, DE
• Alexander Koehl · Trier, DE
• Rainer Massmann · Bonn, DE
• Rolf Mintgen · Peitz - Picnjo, DE
• Marc Nadler · Bendorf, DE
• Willi Nieratschker · Koblenz, DE
• Rainer Sauer · Anschau, DE

Key dates

• Filing date: Aug 26, 2008
• Grant date: Dec 8, 2009
• Expiry date: Aug 26, 2028

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/3257
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a gas spring which uses a compensating medium acting on a compensating piston in order to compensate the dependence on temperature of its characteristic. According to a first aspect of the invention, a compensating medium (16M) is selected whereof the critical temperature (TK) is between the lower limit temperature (Tlower) and a temperature exceeding the upper limit temperature (Tupper) Of the range of operating temperatures of the gas spring (50) by up to 100° C., and the gas spring (50) is designed such that, at an operating temperature (TB) of the gas spring (50) not exceeding the critical temperature (TK) of the compensating medium (16M), the point indicating the state of the compensating medium (16M) lies on or above the vapor pressure curve. According to a second aspect, in order to simplify the structure of the gas spring (50), a single compensating piston (10) which takes the shape of a cup is used and separates the working chamber (Ia), the compensating chamber (16) and the restoring chamber (15) of the gas spring (50) from one another.