Disk pendulum vibration damper

An apparatus for damping torsional vibration in a crankshaft, the apparatus comprising:

• a plurality of retainer pockets spaced from each other along the axis of rotation of the crankshaft and connected for contemporaneous rotation with the crankshaft, each of the plurality of retainer pockets encircling the axis of rotation of the crankshaft;
• and
• a plurality of disks each disposed within one of the retainer pockets, each retainer pocket having a circular track wall, each disk being free to shift perpendicular to the axis of rotation of the crankshaft to engage and move along the circular track wall in response to the vibration;
• wherein each circular retainer pocket has a center that is at a predetermined radial offset distance relative to the axis of rotation of the crankshaft and the respective radial offsets are angularly spaced from each other about the axis of rotation of the crankshaft.