A torsion damping apparatus between the
crankshaft of the engine and the input shaft of the change-speed transmission of a motor vehicle has two flywheels one of which is driven by the
crankshaft and the other of which drives the input shaft by way of a friction
clutch which generates heat. In order to prevent the transfer of heat from the friction
clutch to the antifriction bearing between the flywheels, which are rotatable relative to each other against the opposition of a
damper, the bearing is at least partially surrounded by a thermal barrier of synthetic plastic,
ceramic or metallic material which prolongs the useful life of the bearing and enhances the torsion damping action of the
damper. The thermal barrier can constitute or form part of the
damper. The bearing can be disposed radially inwardly of the location of engagement between the
clutch and the other
flywheel and can be cooled by streams of air flowing through an annulus of passages each having a first end disposed radially inwardly of the friction surface of the other
flywheel and a larger second end in a second surface of the other
flywheel opposite the friction surface. Heat barriers in the other flywheel can alternate with the passages in the circumferential direction of the other flywheel.