Air spring

US4732077A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventor

• Willi Schweikert · Heidelberg, DE

Key dates

• Filing date: Sep 17, 1985
• Grant date: Mar 22, 1988
• Expiry date: Sep 17, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86919
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A pressure controller for an air spring having a gas-filled, variable interior space for spring action between relatively-vibrating bodies has interconnected intake and outlet valve stems for opposite valve action and an actuating piston responsive to the gas pressure in the variable interior space and an oppositely-acting compression spring for moving the valve stems. High pressure in the variable interior space opens the outlet valve to vent the variable interior space to the atmosphere and low pressure in the variable interior space opens the inlet valve to supply compressed gas to the variable interior space from a reservoir.