output part 9 fig2 shows a cutout from fig1 for detailed illustration of the friction device 15 the two disc parts 10 13 disposed coaxially contrarotatably feature friction surfaces 17 18 respectively facing one another and tensioned by several clamps 16 axially pre stressed and distributed over the circumference the clamps 16 are accommodated in cutouts 19 20 of the disc parts 10 13 and at least suspended on a disc part 10 13 secured against rotation and loss as such they are fitted preferably u2014 as depicted u2014 with their opening outwards so that they can be supported radially on the cutout 19 by means of the clasp 21 under the effect of centrifugal force the chicks 22 23 exert the pre stressing force against both friction surfaces 17 18 in disc parts 10 13 undercuts 24 25 are provided to secure the clamp 16 from getting lost for easy assembly the chicks 22 23 of the clamp 16 feature insertion slants 26 27 fig3 shows the upper sectional half of a hydrodynamic torque converter 1 disposed around a rotation axis with a torsional vibration damper 2 disposed in its housing according to a further embodiment the spring element 30 is connected with the disc part 13 in a form closed manner by means of a fastening element 32 on the side surface 42 in the radial outer area thus on the spring element 30 a cutout is provided through which the fastening element 32 extends in order to establish a non rotatable link to the disc part 13 a further fastening element 33 is provided in the form of a pick up on the side surface 42 of the disc part 13.