Torsion damping device for a disc type friction clutch for an automobile vehicle

A torsion damper for a disc type friction clutch for an automotive vehicle, of the kind comprising a lining support plate and a hub which are movable angularly with respect to each other within the limits of a predetermined angular displacement, the support plate and the hub being coupled together by two torsion damping devices arranged to act successively, one of which, namely a first device or pre-damper, is weaker than the other, namely a second device or main damper;

• comprising a damper plate mounted on the hub with a clearance permitting said angular displacement, two guide rings, fixed with respect to each other and disposed axially on either side of the damper plate, and a plurality of resilient angular displacement means interposed circumferentially between the damper plate and the rings;
• and further comprising associated friction means, in which said damper there is provided a centring means comprising a bush surrounding the hub, and a face plate fixed with respect to the bush and extending radially intermediate one of the guide rings and the damper plate of the main damper, axial elements being provided for centring the damper plate and projecting axially between the damper plate and the face plate, wherein the outer peripheral surface of the bush is in frictional contact with the inner peripheral edge of said one of the guide rings of the main damper, the face plate also having axially extending spacers the end surfaces of which make contact with the adjacent face of the damper plate of the main damper.