Mannesmann Sachs Ag

Fichtel & Sachs Ag

Jorg Willert

Joachim Lindner

Thomas Otto

Wolfgang Grosspietsch

Angelika Ebert

Herbert Voit

Hans-Jurgen Drexl

Manfred Wehner

Jurgen Liebler

An operation device for a friction clutch arranged in the drive train of a motor vehicle. The operation device includes a positioning servo arrangement with a pneumatic power cylinder arrangement. The pneumatic power cylinder arrangement acts on a clutch release sleeve arrangement. The positioning servo arrangement can be operated with a control valve that is connected to a pneumatic source depending on a command variable representing a desired position and an actual variable representing the axial position of the clutch release sleeve arrangement. The pneumatic power cylinder arrangement is arranged inside of the bell-shaped housing and the control valve is arranged outside of the bell-shaped housing or the bell-shaped housing is arranged at least partially inside of the bell-shaped housing, but is accessible from the outside and/or can be removed when the bell-shaped housing is attached to the combustion engine.

Friction clutch for a motor vehicle and an operation device for the

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 quantity is represented by the position of a first valve element of the two valve elements and the actual quantity is represented by the position of a second valve element of the two valve elements relative to the valve housing. A differential quantity associated with the actual quantity and control quantity is represented by the position of the two valve elements relative to one another.

Actuating device for actuation, especially pneumatic actuation, of a

An arrangement of foot operated elements for a motor vehicle includes a first element with a power booster for operating a brake and a second element with a second power booster for operating a clutch of the motor vehicle. The second power booster for actuating the clutch release is arranged adjacent the power booster for actuating the brake device. The power booster for the clutch has a linear guide which guides the second element, which is an actuating push rod by which the second power booster for the clutch can be operated directly. The second power booster for the clutch further has a servo device which further reduces the actuating forces and/or the operating paths for actuating the clutch.

Arrangement of foot operating elements for a motor vehicle

An operating device of a friction clutch arranged in the drive train of a motor vehicle, having a positioning servo arrangement with a pressure medium power cylinder arrangement located inside the housing bell and acting on a clutch release bearing arrangement. The invention that the pressure medium power cylinder arrangement, an input element arrangement associated with a control valve and, in some cases, additional anti-tilting moment devices are embodied and/or adjusted to each other and, in some cases, to the clutch so that the force resulting from the forces exercised by the pressure medium power cylinder arrangement, the input element arrangement and, in some cases, the additional anti-tilting moment devices directly or indirectly on the clutch release bearing arrangement or the clutch release bearing arrangement side of the pressure medium power cylinder arrangement, during at least one clutch operation phase, are at least substantially coaxial to the clutch axis.

Growing community of inventors

Schweinfurt, Germany

Jorg Willert