Vehicle propulsion system torque transfer vibration attenuation mechanism

A torque transfer mechanism comprising:

• an input member to receive from a combustion engine, an input torque about an axis of rotation;
• an output member coupled to the input member to transfer the input torque to a driveline component;
• at least one clockspring to restrict relative rotation between the input member and the output member;
• a mass plate coupled to the output member and configured to rotate about the axis of rotation;
• a first set of pendulum mass absorbers movably coupled to the mass plate at a first distance from the axis of rotation;
• and
• a second set of pendulum mass absorbers movably coupled to the mass plate at a second distance from the axis of rotation.

A propulsion system comprising:

• a combustion engine to generate a propulsion torque;
• a variable ratio transmission adapted to output the propulsion torque to at least one road wheel;
• and
• a torque transfer mechanism coupled to the combustion engine and arranged to pass torque to the transmission and attenuate engine vibration, the torque transfer mechanism comprising:
• an input member to receive from the engine, a torque about an axis of rotation,
• an output member coupled to the input member to transfer an input torque to a driveline component,
• at least one clockspring coupling the input member to the output member and adapted to provide damping over a range of engine torque and engine speed,
• a mass plate coupled to the output member and configured to rotate about the axis of rotation, and
• a plurality of pendulum mass absorbers movably coupled to the mass plate and adapted to attenuate engine vibration.