Piston accumulator

US4878519A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Josef Berding · Ludwigsburg, DE
• Hannes Bertling · Leinfelden, DE
• Thomas Lees · Ludwigsburg, DE
• Carsten Pabst · Stuttgart, DE

Key dates

• Filing date: Aug 11, 1988
• Grant date: Nov 7, 1989
• Expiry date: Aug 11, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S277/91
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An accumulator comprises a cylinder formed with a substantially closed chamber and a piston formed with a small-diameter central region and a pair of large-diameter end regions flanking the central region and each formed with an outwardly open annular groove. This piston subdivides the chamber into a gas compartment at one of the end regions, a liquid compartment at the other end region, and an annular charging compartment surrounding the central region. The piston is displaceable in the cylinder to oppositely vary the volumes of the gas and liquid compartments. Respective gas and liquid seals are engaged in the grooves between the gas- and liquid-compartment end regions of the piston and the cylinder and are both constructed to inhibit fluid flow from the respective gas and liquid compartments into the charging compartment. The liquid seal is also constructed to inhibit fluid flow from the charging compartment into the liquid compartment but the gas seal is constructed to permit fluid flow from the charging compartment past itself into the gas compartment. A passage is formed in the cylinder opening directly into the charging compartment for introducing a gas under pressure into s…