Setting device for a hydraulic machine

US4304172A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Rometsch · Gerlingen, DE
• Karl Veil · Uhingen, DE
• Georg Kehl · Stuttgart, DE

Key dates

• Filing date: Feb 28, 1980
• Grant date: Dec 8, 1981
• Expiry date: Feb 28, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B49/002
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A servo mechanism for adjusting the position of a biased control member of a sliding ring for controlling pressure fluid in a main conduit of a hydraulic machine, comprises a manually adjustable sleeve, a setting piston arranged for reciprocating movement in the sleeve and being hydraulically connected thereto to resume a position preset by the sleeve, a follower piston coupled between the setting piston and the biased control member of the recoiling device, a control pressure space provided above the follower piston, a unidirectional first control conduit delivering a regulating stream of pressure fluid from the main conduit to actuate the setting piston, a second control conduit between the main conduit and the pressure space, and a flow controlling valve controlled by pressure in the first control conduit for equalizing pressure between the pressure space and the main conduit thus allowing override of the setting piston during the pressure setting operation.