Piston-cylinder unit

US7066310B2 · kind B2 · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Rolf Mintgen · Peitz - Picnjo, DE
• Wilhelm Schwab · Neuwied, DE
• Paul Muders · Rhens, DE
• Frank Born · Dienethal, DE
• Andre Stein · Berlin, DE

Key dates

• Filing date: Jul 25, 2003
• Grant date: Jun 27, 2006
• Expiry date: Jul 25, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/464
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A piston is guided in an axially displaceable manner sealed off from a closed cylinder via an annular seal radially surrounding it, and divides the cylinder interior into a working space near the piston rod and a working space away from the piston rod. The two working spaces are filled with a hydraulic fluid. The piston has a one-sided piston rod which extends through the working space near the piston rod and is guided in a sealed manner to the outside through an end closing wall of the cylinder. A first valve can be opened under high pressure to connect the working space away from the piston rod to the working space near the piston rod. A second valve can be opened under high pressure to connect the working space near the piston rod to the working space away from the piston rod. A volume-equalizing chamber for receiving the amount displaced from the working space away from the piston rod, which is greater than the amount displaced from the working space near the piston rod. The volume-equalizing chamber is arranged in the piston, and the working space away from the piston rod can be connected to the volume-equalizing chamber via the first valve and the working space near the pisto…