Abstract: In an actuation device for a friction clutch which is arranged in the drivetrain of a motor vehicle between a drive unit and a transmission, comprising a pressure medium force cylinder arrangement by means of which the friction clutch can be actuated via a release member, a measuring arrangement which detects an actual release, a control/regulating valve arrangement which is connected with a pressure medium source, with a pressure compensation opening or a pressure compensation reservoir and with the pressure medium force cylinder arrangement and which is controllable electrically, by means of which valve arrangement the pressure medium force cylinder arrangement can be actuated depending on the actual release and on a reference release which can be predetermined, the control/regulating valve arrangement can be actuated via control/regulating electronics depending on the actual release, on an electrically presettable command variable and on a characteristic line converting the command variable into the refere

Abstract: An actuation device for a friction clutch arranged in a drivetrain of a motor vehicle between a drive unit and a transmission in a housing having a pressure medium force cylinder arrangement arranged in the housing, which preferably comprises a pressure medium force ring cylinder. The friction clutch can be actuated by means of this pressure medium force cylinder arrangement via a release bearing arrangement which is moveable coaxial to the friction clutch. A measuring arrangement associated with the release bearing arrangement or a release bearing arrangement side of the pressure medium force cylinder arrangement or friction clutch detects an actual release with a plurality of measurement receivers arranged in the housing so as to be distributed about the clutch axis.

Abstract: An actuation device for a friction clutch which is arranged in the drivetrain of a motor vehicle between a drive unit and a transmission arrangement includes a pressure medium force cylinder arrangement for actuating the friction clutch via a release member having a release bearing arrangement. A measuring arrangement detects an actual release state, i.e., an instantaneous position of the release member. A control/regulating valve arrangement is connected with a pressure medium source, a pressure compensation opening, and with the pressure medium force cylinder arrangement. The pressure medium force cylinder arrangement is actuated depending on the actual release state and on a desired release state.

Abstract: An actuating installation for a friction clutch arranged in the drive line between a drive unit and a transmission. The installation having an actuating arrangement for the actuation of the friction clutch and a clutch-pedal arrangement, which is connected to the actuating arrangement and has a clutch pedal, which, in a first operating state, is actuable according to a force-travel characteristic of a first type. The actuating installation has a signaling and/or protection device, which is in operative connection with or is operatively integrated in the clutch-pedal arrangement, so that, after the response of the signaling and/or protection device to a second operating state, the clutch pedal can be actuated only according to a force/travel characteristic of a second type, which differs significantly from the force/travel characteristic of the first type in order thus to indicate the second operating state.

Abstract: An adjustment ring of a motor-vehicle clutch is supported on bearing surfaces of supporting protrusions of a pressure plate by one of first and second supporting surfaces on the adjustment ring. The second supporting surface is axially closer to the pressure plate than the first supporting surface. The bearing surfaces and the first and second supporting surfaces are aligned parallel to the plane of rotation of the pressure plate. The first and second supporting surfaces are each connected via an oblique surface so that the adjustment ring is manually rotatable relative to the pressure plate between a first position where the first supporting surface bears on the bearing surface and a second position where the second supporting surface bears on the bearing surface.