Patent ID: 6540059
Filing Date: 2003-04-01
Classification: F16D

Abstract:
An actuation device for a friction clutch having a release force receiving arrangement and being arranged in a drivetrain of a motor vehicle between a drive unit and a transmission arrangement, said actuation device comprising:a pressure medium force cylinder arrangement having a release member with a release bearing arrangement connectable to the friction clutch for actuating the friction clutch; a measuring arrangement arrangeable for detecting an actual release state corresponding to a position of the release member; a control/regulating valve arrangement connected to a pressure medium source, a pressure medium opening, and said pressure medium force cylinder arrangement for actuating said pressure medium force cylinder arrangement in response to said actual release state of said release member and a desired release state, said actuation device being adjustable between an actuation state and a non-actuation state, wherein said actuation device is arrangeable such that said release member is coupled with the release force receiving arrangement of the friction clutch in the actuation state of said actuation device and is decoupled from the release force receiving arrangement in the non-actuation state of said actuation device; and a control/regulating unit operatively arranged for adjusting said actuation device between the non-actuation state and the actuation state, wherein said control/regulating unit actuates said pressure medium force cylinder arrangement in response to the actual release state and the desired release state of said release member via said control/regulating valve arrangement, wherein said control/regulating unit actuates said pressure medium force cylinder arrangement via said control/regulating valve arrangement for selectively adjusting said actuation device from the non-actuation state into the actuation-ready state, from the non-actuation state into a boundary state belonging to the actuation state of beginning clutch actuation, and from the non-actuation state through the boundary state into the actuation state, said release bearing arrangement momentarily occupying said boundary position which corresponds to the fully engaged state of the friction clutch, and wherein said control/regulating unit determines said boundary position in response to measurements taken by said measuring arrangement and further comprises a memory for storing said determined boundary position.