The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2001
Filed:
Jan. 07, 1999
Jörg Willert, Schweinfurt, DE;
Joachim Lindner, Hambach, DE;
Mannesmann Sachs AG, Schweinfurt, US;
Abstract
An actuating device for a friction clutch arranged in the drive train of an automobile between an internal combustion engine and a gear in a casing bell. The actuating device includes a disengagement bearing arrangement and a positioning servo arrangement, having a pressure-medium power cylinder arrangement, for the disengagement bearing arrangement, the positioning servo arrangement having a control valve connected to a pressure-medium source. The control valve includes a valve arrangement which can be changed over between at least two control states as a function of an actual value representing the axial position of the disengagement bearing arrangement and of a command variable representing a desired position of the disengagement bearing arrangement. In a first controlled 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 equalizing orifice. The valve arrangement includes two valve elements movable relative to one another and relative to a valve housing. The command variable is represented by the position of a first of the two valve elements and the actual value by the position of a second of the two valve elements relative to the valve housing, and a difference quantity assigned to the actual value and to the command variable is represented by the position of the two valve elements relative to one another.