Control arrangement for at least two hydraulic consumers and pressure differential valve for said control arrangement

US6644025B1 · kind B1 · utility

Assignee

• Bosch Rexroth Corporation · DE

Inventors

• Martin Oberhausser · Aschaffenburg, DE
• Thomas Weickert · Karsbach, DE

Key dates

• Filing date: Jul 27, 2001
• Grant date: Nov 11, 2003
• Expiry date: Jul 27, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/78
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A control arrangement to supply-pressure medium to at least two hydraulic consumers having a variable-displacement pump controlled according to required flow and the setting of which can be changed by a, pump controller as a function of highest load pressure of the actuated hydraulic consumers; two adjustable meter-in variable restrictors, a first of which is arranged between a feed line, which leads from the variable-displacement pump, and a first hydraulic consumer, and the second of which is arranged between the feed line and a second hydraulic consumer; and two pressure compensators, a first of which is connected downstream of the first meter-in variable restrictor and the second of which is connected downstream of the second meter-in variable restrictor, and the control piston of which can be acted on in opening direction by the pressure downstream of the associated meter-in variable restrictor. To ensure in this type control arrangement that a brief excess quantity from the variable-displacement pump is not passed on to the hydraulic consumers, the control pistons of the pressure compensators can be acted on in closing direction by a control pressure which is present in a rea…