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A torsional coupling or resilient damper assembly for a friction clutch or torque converter lock-up clutch which is formed of a plurality of spiral spring plates or discs that are secured together as a unit with an outer peripheral ring and an inner ring for each disc joined together by one or more

A torsional coupling or resilient damper assembly for a friction clutch or torque converter lock-up clutch which is formed of a plurality of spiral spring plates or discs that are secured together as a unit with an outer peripheral ring and an inner ring for each disc joined together by one or more spiral spring members formed by one or more spiral slots extending between the inner and outer rings. The coupling is formed of a stack of plates wherein the slots in the plates are axially aligned and the forces in the plates are balanced when two or more spiral slots are utilized. If a single spiral slot is provided in each disc, the forces are balanced by alternate plates being reversed or all plates being positioned identically but phased through angles divisible into 360°. Different embodiments of spiral spring discs may be combined in a single assembly.

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A spring disc resilient coupling adapted for use in a torsional coupling or clutch assembly between driving and driven members, comprising a plurality of spring discs secured together to operate as a unit, each disc including an outer peripheral ring having a plurality of circumferentially spaced op

A spring disc resilient coupling adapted for use in a torsional coupling or clutch assembly between driving and driven members, comprising a plurality of spring discs secured together to operate as a unit, each disc including an outer peripheral ring having a plurality of circumferentially spaced openings therein, an inner peripheral ring having a plurality of circumferentially spaced openings therein and at least one smooth continuously curved slot extending through said disc between said outer ring and said inner ring to define a curved resilient member joining the inner and outer rings and resisting relative rotation therebetween, each said curved slot intersecting an outer opening and an inner opening, said outer rings being secured to one of said driving or driven members and said inner rings being operatively connected to the other of said driving or driven member.