Shock absorber device

US4311302A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Gunther Heyer · Schweinfurt, DE
• Karl Kany · Schweinfurt, DE
• Paul Spichala · Schweinfurt, DE
• Felix Wossner
• Wilhelm Wecker · Schweinfurt, DE

Key dates

• Filing date: Dec 19, 1979
• Grant date: Jan 19, 1982
• Expiry date: Dec 19, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60G15/12
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In a shock absorber device, a piston rod unit is axially displaceable through a cylindrical member from one end toward the other end thereof. The cylindrical member forms a variable volume working chamber containing a first fluid. A spring chamber is in communication with the working chamber so that the first fluid can flow between the two chambers. A pressurized second fluid is contained within the spring chamber separate from the first fluid and it acts on the first fluid for biasing the piston rod unit out of the working chamber. When the piston rod unit is moved into the working chamber and approaches an inner end position, it forms at least in part a damping chamber which decelerates the movement of the piston rod unit.