Hydropneumatic spring strut

US6161821A · kind A · utility

Assignee

• ContiTech Luftfedersysteme GmbH · DE

Inventors

• Valerij Leno · Hannover, DE
• Roland Altsinger · Burgdorf, DE

Key dates

• Filing date: Apr 1, 1999
• Grant date: Dec 19, 2000
• Expiry date: Apr 1, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60G2202/154
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A gas spring/shock absorber unit (2) or so-called gas spring strut includes a gas spring (4) having a gas spring resilient member (6), a gas spring piston (8) and a gas spring cover (10). The gas spring strut also includes a shock absorber (12), which is arranged coaxially within the gas spring (4) and has a damper cylinder (14), a damper piston (16) and a piston rod (18). The gas spring strut is so configured that wear of the mutually movable parts (16, 26) is substantially precluded. For this purpose, an impact disc (20) is disposed within the damper cylinder (14). The impact disc (20) partitions the volume of the damper (12) into two component spaces (22 and 24). Pass-through openings (28, 30) for the piston rod (18) of the shock absorber (12) are provided in the impact disc (20) and in the piston plate (26) of the gas spring piston (18), respectively. The pass-through openings (28, 30) provide respective connecting gaps (32, 34) between the gas and hydraulic liquid spaces (6a, 22 and 24). The hydropneumatic spring strut (2) can be used to suspend the chassis of automobiles and commercial vehicles such as buses, trucks and trailers.