Patent ID: 7571795

Claim:
A coupling device for a motor vehicle, the coupling device having a clutch ( 2 ) arranged in a force flow between a drive motor and a transmission and a dedicated servo-assisted control mechanism, the clutch ( 2 ) is, via a pressing spring ( 8 ), a passively lockable coupling, and via a clutch release sleeve ( 10 ), a disengageable dry friction coupling, and the control mechanism includes an operative primary drive ( 11 ) between a clutch pedal ( 12 ) and the clutch release sleeve ( 10 ) and a pneumatically operative servo drive ( 13 ) with a pneumatic actuator ( 18 ) immediately adjacent to the clutch release sleeve and with a control valve ( 17 ) controllable by the clutch pedal ( 12 ), the pneumatic actuator ( 18 ) of the servo drive ( 13 ) is a ring cylinder arranged coaxially to an input shaft ( 9 ) of the transmission and the primary drive ( 11 ) as an hydraulic adjusting drive with a master cylinder ( 14 ) on a pedal side and at least one slave-cylinder ( 15 ) on a clutch side, and the slave cylinder ( 15 ) is located completely inside of a pressure space ( 23 ) of the pneumatic actuator ( 18 ), a solid cylinder of the master cylinder ( 14 ) is connected to a solid cylinder ( 21 ) of the pneumatic actuator ( 18 ) and a piston of the slave cylinder ( 15 ) is connected to a piston ( 22 ) of the pneumatic actuator ( 18 ).