Electrohydraulic control unit

US3964518A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Horst Hesse · Stuttgart, DE
• Walter Kobald · Schwieberdingen, DE
• Heinz Gand
• Rainer Hoheisel
• Klaus Sopha
• Heinz Flaschar
• Heinz Kleinschmidt · Ditzingen, DE
• Winfried Arnold · Lambach, DE
• Werner Zeuch

Key dates

• Filing date: Sep 11, 1975
• Grant date: Jun 22, 1976
• Expiry date: Sep 11, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86614
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An electrohydraulic control unit which regulates the flow of hydraulic fluid to and from one or more consumers by way of a directional control valve has a cylinder for a piston which is mechanically connected with or constitutes the spool of the directional control valve and divides the interior of the cylinder into two plenum chambers connected to the outlet of the pump, either directly or by way of a pressure reducing valve. The chambers are further connected with the tank and each of the fluid supplying and evacuating conduits for each of the two chambers contains a flow restrictor. Th flow restrictors in conduits for admission of fluid to the chambers are mounted upstream of check valves and the flow restrictors in conduits for evacuation of fluid from the chambers are mounted upstream of or constitute integral parts of two solenoid-operated auxiliary valves. The four flow restrictors together constitute a hydraulic bridge circuit.