Apparatus for damping-torsional vibrations

Apparatus for transmitting torque between a variable-speed rotary output element and a variable-speed rotary input element, comprising a damper including coaxial input and output members rotatable with and relative to each other about a common axis, one of said members including a substantially disc-shaped carrier;

• elongated arcuate first resilient energy storing elements disposed at a radial distance from said axis to yieldably resist rotation of said members relative to each other in at least one direction with a first force which increases in response to increasing angular displacement of said members relative to each other in said at least one direction, and to frictionally engage at least one of said members under the action of centrifugal force with a second force which acts in parallel with said first force and increases in response to increasing speed of said members;
• and at least one second energy storing element positioned in series with said first energy storing elements to yieldably oppose rotation of said members relative to each other in said at least one direction with a variable third force which increases in response to increasing angular movement of said members relative to each other in said at least one direction but is at least substantially independent of the centrifugal force, said at least one second energy storing element being of one piece with said carrier and said output member including a first portion, a second portion including said carrier, and means for affixing said second portion to said first portion.