Noise abatement structure for system for reducing torsional vibration on a rotary shaft

A system for reducing torsional vibrations for a rotary shaft in a vehicle, comprising:

• an isolation device mountable on the rotary shaft, and which is rotatable thereon about an axis, wherein the isolation device includes a shaft adapter that is mounted to the rotary shaft, a rotary transfer member that is rotatably mounted to the shaft adapter and which is shaped to engage one of an endless drive member or a gear, and at least one isolation spring that resiliently transfers torque between the pulley and the shaft adapter;
• a torsional vibration damper that is mountable to the rotary shaft, wherein a noise generation space extends axially between the isolation device and the torsional vibration damper;
• and
• a noise abatement ring that extends axially from one of the isolation device and the torsional vibration damper towards the other of the isolation device and the torsional vibration damper, and at least partially radially encloses at least a portion of the noise generation space, wherein the noise abatement ring extends to within a selected distance of the other of the isolation device and the torsional vibration damper.