Clutch assembly for a planetary forward reverse gear set

A clutch assembly for a planetary forward-reverse gear set in a transmission mechanism for vehicles, in particular for automobiles with a front wheel drive, comprising

• a forward friction disk clutch and a reverse friction disk brake each operated through a servo piston and servo cylinder unit to shift said planetary gear set selectively into a forward and a reverse driving direction of the transmission mechanism,
• a continuously variable pulley drive having a primary pulley, a secondary pulley and a driving belt for transferring power between these two pulleys each of which comprises a fixed sheave and a movable sheave, whereby at least the movable sheave of the primary pulley is adjustable by means of a hydraulic adjusting means comprising an adjusting piston and adjusting cylinder unit with respect to its coordinated fixed sheave that is fixedly connected to an input drive shaft of the transmission mechanism,
• the input drive shaft carrying an interconnected sun gear of said planetary gear set which further has a pinion carrier for pinion gears that is connected to the input drive shaft only when said forward friction disk clutch is operated and which also has a ring gear that is connected to the transmission housing only when said reverse friction disk brake is operated to provide said forward and reverse driving directions, respectively,
• the adjusting piston of said hydraulic adjusting means being fixedly connected in an axially stationary manner to the adjacently arranged servo cylinder of the servo piston provided for the operation of said forward friction disk clutch, whereby the servo piston is at least partly surrounded by said adjusting cylinder which is fixedly connected to the movable sheave of the primary pulley of said pulley drive.