Hydraulic cylinder sealing structure

US5540309A · kind A · utility

Assignees

• August Bilstein GmbH & Co. KG · DE
• Mercedes-Benz Group AG · DE

Inventors

• Zhen Huang · Wuppertal, DE
• Klaus Schmidt · Eibelstadt, DE
• Hans Scheerer · Eßlingen, DE
• Andreas Opara · Fellbach, DE

Key dates

• Filing date: Dec 14, 1994
• Grant date: Jul 30, 1996
• Expiry date: Dec 14, 2014

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/369
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A regulable hydraulic dashpot for motor vehicles with a shock-absorption piston equipped with pressure-sensitive throttle valves traveling back and forth on the end of a piston rod inside a shock-absorption cylinder full of shock-absorbing fluid and dividing the cylinder into two displacement chambers. A gas-filled pressure-compensation chamber operates in conjunction with one displacement chamber. A shock-absorption performance-curve selection valve is positioned outside the cylinder and opens and closes a bypass. To create a hydraulic-fluid channel, the cylinder comprises two parts of different width between the two displacement chambers. One of the parts overlaps the other to the length of the stroke traveled by the piston and its open end is sealed tight to the outer part. The outer part is provided with two hydraulic-fluid conveying connections into the shock-absorption performance-curve selection valve. The parts of the cylinder between the connections are sealed off from each other by a sealing component.