Motor vehicle double damping flywheel, comprising improved means for friction damping of vibrations

A double flywheel, comprising two coaxial rotatable masses rotatably mounted to one another about a common axial axis of symmetry, with, interposed operatively between the two masses are a coupling means and an axially acting friction means, wherein a first one of the two masses is adapted to be coupled in rotation to a driving shaft, while the second of the two masses is adapted to be coupled in rotation disconnectably to a driven shaft, the second of the two masses including a reaction plate of a friction clutch, and is mounted for rotation on the first mass, the friction means including;

• a control ring, a portion of which is arranged to engage frictionally on a friction face of the first one of the masses, and which is coupled in rotation to the second of the two masses;
• a friction ring situated radially outwardly of the control ring, which meshes with the control ring with a circumferential clearance, and which is biased into contact with the friction face;
• and
• a closure ring fixed to the first one of the two masses, the control ring and the friction ring being placed axially between the friction face of the closure ring, wherein the control ring is arranged to engage frictionally on the friction face and on the closure ring, and the control ring is gripped elastically between the friction face and the closure ring.