Piston-cylinder unit particularly for shock absorber or compression strut

US4364457A · kind A · utility

Assignee

• Fichtel & Sachs A.G.

Inventors

• Felix Wossner
• Gunther Handke · Euerbach, DE

Key dates

• Filing date: Nov 20, 1979
• Grant date: Dec 21, 1982
• Expiry date: Nov 20, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/3242
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A piston-cylinder unit including a cylinder assembly, a guide and seal assembly at one end of the cylinder assembly and a piston rod assembly axially movable relative to said cylinder assembly through the guide and seal assembly is formed with a cap assembly having an annular bottom, which is essentially normal to the axis of the unit, and a jacket with the piston rod assembly extending through the annular bottom and with the annular bottom being located adjacent the guide and seal assembly on a side thereof facing away from a hollow space defined within the cylinder assembly. The jacket bears against the outer circumferential surface of the cylinder assembly, and a tubular body which is elastically compressible in the axial direction is arranged on the outer portion of the piston rod assembly, with the tubular body being fastened in the axial direction on a fastening point of the piston rod assembly at a portion facing away from the cap assembly. The tubular body defines around a piston rod of the piston rod assembly an annular chamber which is open toward the cap assembly. A closing device on the cap assembly closes the annular chamber when the piston rod approaches its inner end…