Torsional damper, notably a clutch friction assembly for a motor vehicle

A torsional damper comprising:

• two coaxial parts mounted so as to move with respect to each other counter to first elastic members acting circumferentially wherein one of the parts has an input element fixed to two guide washers connected to each other and fixed by columns, while the other part has a disc and an output element, mounted so as to move with respect to each other counter to second elastic members acting circumferentially, called low-stiffness springs, with the action of meshing means with a clearance limiting the relative angular movement between the disc and the output element and wherein the guide washers are disposed on each side of the disc with the action of first friction means acting axially between the disc and the guide washers and second friction means acting axially between a flange of the output element, provided with teeth meshing with complementary teeth on the disc to form the meshing means with the clearance, and the guide washers, the output element has at an external periphery thereof, projecting radially towards the outside, a stepped flange having a first area and a second area axially offset with respect to the first area, the second area has at its external periphery in a continuous manner the teeth of the output element belonging to the meshing means with the clearance, the low-stiffness elastic members are housed in the first area in open recesses formed in an annular bearing fixed with respect to rotation to the disc while being interposed on the one hand radially between one of the guide washers, referred to as the first guide washer, and the output element and, on the other hand, axially between the disc and the first guide washer so that the low-stiffness springs are housed in a cavity defined by the bearing and the first area of the stepped flange and the meshing means with the clearance wherein, the bearing has, moving from an internal periphery thereof to an external periphery thereof, respectively an axially oriented ring, a first wall with an overall transverse orientation, a wall with an overall axial orientation and a second wall with an overall transverse orientation.