Clutch disk for motor vehicle main clutches

Claim 1

In a clutch disk arrangement for motor vehicle main clutches which includes a hub means, friction lining means, a disk means for carrying said friction lining means, means for torsionally elastically connecting said disk means with said hub means including a plurality of spring means having different spring characteristics for producing a multi-stage operation of the clutch disk arrangement, a plurality of window means for respectively accommodating said spring means, separate damping means for damping said plurality of spring means, and control means for controlling the start of operation of at least one damping means, the improvement comprising: said control means including a means for engaging a window means accommodating the spring means for producing a second stage of the multi-stage operation, a separate control spring coordinated to the control means, said separate control spring being mounted in said control means and being prestressed to a predetermined spring force in excess of the force necessary to maintain said control spring in said control means such that the point at which said control means is fully effective is determined exclusively by an equilibrium of the force of the control spring and a friction force effective within an operating stage of the clutch disk arrangement during which said control means is effective.