Torsion damping device with a centring ring member

#1. Field of the Invention

#The present invention relates to a torsion damping device, especially for a friction disc clutch for an automotive vehicle, comprising at least three coaxial parts mounted in pairs and rotatable with respect to each other within the limits of a predetermined angular displacement and against the biassing action of resilient means, the coaxial parts comprising a first part including a hub, a second part comprising a main damper plate with relative rotational displacement means between it and the hub, and a third part comprising at least one rotatable element which constitutes transversely an annular member surrounding the hub but not coupled with the latter.

#2. Description of the Related Art

#FIG. 1 is a view in elevation, with certain parts locally cut away, of a torsion damping device according to the invention with the friction pads omitted;

#FIG. 2 is a sectional view of this torsion damping device taken on the broken line II--II in FIG. 1;

#FIG. 3 is a partial axial sectional view showing a spacer arrangement;

#These Figures show by way of example the application of the invention to a friction disc clutch, particularly for an automotive vehicle.

#In general, the torsion damping device which forms part of this friction disc clutch comprises three coaxial parts, A, B, C, rotatable with respect to each other within the limits of a predetermined angular displacement and against the biassing action of resilient means.

#Part A comprises a hub 10, adapted to be mounted on, and for rotation with, the input shaft of the gearbox of the vehicle concerned, and for this purpose the bore 11 of this hub is splined.