Patent ID: 8074779

Claim:
A clutch system, comprising: a clutch device and an actuating device for hydraulically actuating said clutch device; and an hydraulic system, said hydraulic system including: a master cylinder to be actuated by way of said actuating device, said master cylinder having a pressure space; a slave cylinder for actuating said clutch device, said slave cylinder having a pressure space; a pressure line connecting said master cylinder with said slave cylinder; a compensating tank volume; a first branch line communicating with said compensating tank volume and connected to said pressure space of said master cylinder or between said pressure space of said master cylinder and said pressure space of said slave cylinder; a second branch line communicating with said compensating tank volume and connected to said pressure space of said slave cylinder or between said pressure space of said master cylinder and said pressure space of said slave cylinder; and means for blocking said second branch line during an actuation of said clutch device by way of said actuating device, said means for blocking having an automatically opening and closing valve for opening and closing a passage of said second branch line, said valve having a valve housing, a sealing body disposed in said valve housing, and a spring for acting on said sealing body, said valve housing formed with two sealing seats and a bypass formed between said sealing body and said valve housing, said sealing body configured to assume a first end position for sealing off said sealing seat to said pressure space of said slave cylinder, a second end position for sealing off said sealing seat to a region of said second branch line facing toward said compensating tank volume, and an intermediate position in which a bypass function is realized, and said spring is relatively relaxed in said first end position and relatively compressed in said second end position.