Torsion damper and clutch disk

A torsion damper for a vehicle powertrain, the damper comprising:

• a first element being able to rotate about an axis of rotation, the first element comprising at least one support element,
• a second element movable in rotation with respect to the first element about the axis of rotation,
• springs mounted between the first element and the second element so as to compress to allow relative rotation about the axis of rotation between the first element and the second element,
• a friction device comprising a friction washer provided with at least one fixing portion rigidly fixed in rotation on the support element of the first element, the friction washer having a friction portion having a friction track backed against a dorsal face of the friction portion;
• and an elastic washer arranged axially between the first element and the dorsal face of the friction portion, each fixing portion for fixing to the first element being connected to the friction portion by a flexible element allowing axial displacement of the dorsal face of the friction portion relative to the support element of the first element,
• wherein the elastic washer is arranged axially between the first element and the dorsal face of the friction portion, for axially pressing the friction portion of the friction washer against a friction surface of the second element or a friction surface rotatably coupled with the second element, and
• wherein each fixing portion is mounted so as to be locked in rotation with one of the support elements, without angular play.