Air spring

US4633761A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventor

• Willi Schweikert · Heidelberg, DE

Key dates

• Filing date: Sep 17, 1985
• Grant date: Jan 6, 1987
• Expiry date: Sep 17, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/261
• 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 intake and outlet valve stems for opposite valve action and an first actuating piston responsive to the gas pressure in the variable interior space for moving at least one of 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.