US 7,571,795 B2
	Coupling device of a motor vehicle
Josef Bader, Friedrichshafen (Germany); and Stefan Renner, Bodman-Ludwigshafen (Germany)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany)
Filed on Oct. 04, 2006, as Appl. No. 11/542,992.
Claims priority of application No. 10 2005 047 930 (DE), filed on Oct. 06, 2005.
Prior Publication US 2007/0080040 A1, Apr. 12, 2007
Int. Cl. F16D 25/08 (2006.01)

U.S. Cl. 192—91A  [192/85 CA; 60/565]

4 Claims

1. 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).