Control device for volume stream of hydraulic working medium

US5290007A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Holger Lueues · Bietigheim-Bissingen, DE
• Hartmut Sandau · Schwieberdingen, DE

Key dates

• Filing date: Sep 30, 1992
• Grant date: Mar 1, 1994
• Expiry date: Sep 30, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B13/015
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A control device for a volume stream of a hydraulic working medium has a blocking valve having a seat valve body cooperating with a stationary main valve seat, a pre-control valve member arranged in the seat valve member and cooperating with a valve seat provided with the seat valve member, an actuating device with which the pre-control valve member is in an operative communication, a spring providing a force with which the pre-control valve member cooperates with the valve seat and controls a pressure in a pressure chamber formed in the seat valve member and a valve housing. The seat valve member is pressed against the main valve seat under the action of the pressure, a pressure chamber for a working medium is formed, a throttle point with a constant cross-section communicates the pressure chamber between the seat valve body and the valve housing constantly with the pressure chamber of the working medium, a variable throttle point connects the pressure chamber between the seat valve body and the valve housing with a container. The variable pressure point has a cross-section which is changeable by the pre-control valve member. The actuating device which cooperate with the pre-contr…