Motor vehicle double flywheel torsional damper

A circumferentially acting torsion damper for a double flywheel for a motor vehicle, to be disposed kinematically between the primary and secondary flywheels of the double flywheel, the first flywheel being adapted to be connected to the crankshaft of the engine of the vehicle and the secondary flywheel being adapted to receive a clutch mechanism, of the kind comprising a first element (10, 110) adapted to be connected to one of the said flywheels and a second element (20, 120) adapted to be connected to the other one of the said flywheels, the said damper including resilient means (30, 40) associated with friction means, the said resilient means consisting of at least one first group (31, 32, 33) of springs (30) working in series through interposed first phasing rings (51, 53, 151, 153), characterised by the fact that the said resilient means include a second group (41, 42, 43) of springs (40) working in series through interposed second phasing rings (52, 54, 152, 154), the said first groups (31, 32, 33) and second groups (41, 42, 43) of springs (30, 40) working in series through an interposed phasing assembly (60, 160).