Clutch device and power train for motor vehicle with such clutch device

The present invention relates to a clutch device (2) with a multi-plate clutch (18), which has a diaphragm group (38) and a hydraulically drivable operating piston (68) provided with a pressure chamber (78) which can be loaded by a hydraulic fluid and a pressure balance chamber (80) which can be filled or has been filled with a fluid (80). The operating piston can be moved from an initial position, in which the multi-plate clutch (18) is open, against the restoring force (F) of at least one wave spring (90), to an operating position, in which the multi-plate clutch (18) can be compressed by the diaphragm group (38) to be closed, wherein, a force (F1) acting in the direction of the operating position on the operating piston (68) can be produced or is produced by the rotational pressure of the hydraulic fluid in the pressure chamber (78), and a balance force (F2) acting in the direction of the initial position on the operating piston (68) can be produced or is produced by the rotationalpressure of the fluid wit