Actuating device for actuation, especially pneumatic actuation, of a friction clutch

US6029789A · kind A · utility

Assignee

• Mannesmann Sachs AG · DE

Inventors

• Joachim Lindner · Schweinfurt, DE
• Jorg Willert · Schweinfurt, DE
• Thomas Otto · Würzburg, DE

Key dates

• Filing date: Jan 8, 1998
• Grant date: Feb 29, 2000
• Expiry date: Jan 8, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B13/0406
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A actuating device for a friction clutch which is arranged in the drivetrain of a motor vehicle in a housing cover between an internal combustion engine and a transmission. The actuating device includes a release bearing arrangement and a positioning servo arrangement for the release bearing arrangement. The positioning servo arrangement has a pressure medium power cylinder arrangement and a control valve connected with a pressure medium source. The control valve includes a valve arrangement which is switchable between at least two control states depending on an actual quantity representing the axial position of the release bearing arrangement and on a control quantity representing a reference position of the release bearing arrangement. In a first control state, there is a pressure medium connection between the pressure medium power cylinder arrangement and the pressure medium source, and in a second control state there is a pressure medium connection between the pressure medium power cylinder arrangement and a pressure compensation port. The valve arrangement includes two valve elements which are movable relative to one another and relative to a valve housing. The control quantit…