Hydraulic Actuating Device for an Automotive Friction Clutch

摘要

A hydraulic actuating device ( 10 ) for an automotive friction clutch ( 12 ), has a master cylinder ( 14 ) whose master piston ( 16 ) can be impinged upon with a master force (F_G) via an actuating mechanism ( 18 ) and can be displaced by a master travel (S_G), and a slave cylinder ( 20 ) with a slave piston ( 22 ) which is hydraulically connected in series to the master piston via a liquid column and is functionally linked with a clutch-release member ( 24 ) of the automotive friction clutch. The actuating device may be provided with an adjusting unit ( 26 ) may have an adjusting piston ( 28 ). The adjusting piston is hydraulically connected in series to the master piston and can be impinged upon with a force and displaced via a transmission ( 30 ) that is driven by an electric motor. The actuating device further has a control unit (C) which is used to control the adjusting unit especially subject to a master variable (F_G; S_G).