Hydropneumatic damping device

US4482036A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Felix Wossner
• Ludwig Axthammer · Diez, DE
• Gunther Heyer · Schweinfurt, DE
• Hermann Itzinger · Dittelbrunn, DE

Key dates

• Filing date: Feb 9, 1983
• Grant date: Nov 13, 1984
• Expiry date: Feb 9, 2003

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/364
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydropneumatic damping device particularly for spring legs of automotive vehicles comprises an inner cylinder, an outer container, a central cavity within the inner cylinder, an annular cavity between the inner cylinder and the outer container, a piston rod with a piston unit, venting passage means between the central cavity and the annular cavity extending across a cavity-closing unit and check valve means associated to said venting passage means. The check valve means comprises an annular check valve member in frictional sliding engagement with the piston rod for axial movement with the piston rod towards a sealing position during inward movement of the piston rod and towards an opening position during the outward movement of the piston rod. First and second abutment means are provided for defining the sealing and the opening position of the annular check valve member, respectively. The second abutment means are axially fixed with respect to the cavity-closing unit by supporting means separated from the cavity-closing unit and fixed with respect to the respective end of the container.