Patent ID: 7815030

Claim:
A clutch disc assembly for a friction torque device, comprising: a clutch damper assembly including a hub defining an axis of rotation and including a concentric steel disc and including a plurality of damper springs disposed between the hub and the steel disc; a first friction ring rotatively fixed to the steel disc concentric with the axis of rotation including a first steel backer plate and the first steel backer plate having a first plurality of keyhole slots radially extending from a location proximate to an inside diameter of the first backer plate to and through an outside diameter of the first backer plate and defining an equal plurality of arms and having an equal plurality of friction pads with one friction pad fixed to each arm on a side opposite the steel disc; a second friction ring rotatively fixed to the steel disc concentric with the axis of rotation including a second steel backer plate and the second steel backer plate having a plurality equal in number to the first plurality of keyhole shaped slots radially extending from a location proximate to an inside diameter of the second backer plate to and through an outside diameter of the second backer plate and defining an equal plurality of arms and having an equal plurality of friction pads with one friction pad fixed to each arm on a side opposite the steel disc with the first friction pads and the second friction pads being in substantial alignment; and a plurality equal in number to the first plurality of cushion elements fixed to the steel disc and axially disposed between the friction rings; wherein the steel disc extends radially between the first and second friction rings and is axially disposed between the cushion elements and one of the backer plates, and has a plurality of slots equal in number to the first plurality.