Patent ID: 8155849
Filing Date: 2012-04-10
Classification: F16D

Abstract:
1. A hydraulic actuating device for an automotive friction clutch comprising: a master cylinder having a master piston, which can be subjected to a master force (F a slave cylinder with a slave piston which is hydraulically connected in series to the master piston said slave piston being actually connected to a clutch-release member of the automotive friction clutch, an adjusting unit which has an adjusting piston which can be subjected to a force and displaced via a transmission that is driven by an electric motor, is arranged in series between the master piston and the slave piston so that the force acting on the slave portion of the liquid column can be increased in a defined manner by subjecting the adjusting piston to force via the transmission, and divides the liquid column between the master piston and the slave piston into a master portion between the master piston and the adjusting piston and a slave portion between the adjusting piston and the slave piston, a control unit that controls the electric motor, a first sensor device which is signal-connected to the control unit and by which a master pressure (p