Patent ID: 8136621

Claim:
A driveline comprising: a shaft that is adapted to couple a first driveline component to a second driveline component to transmit rotary power therebetween; and a damper for damping vibration transmitted through the shaft that occurs at a first frequency and at a second frequency that is lower than the first frequency, the first frequency being associated with a first vibration source in the driveline, the second frequency being associated with a second vibration source in the driveline that is not associated with the first vibration source, the damper comprising a hub, a first mass, a second mass, a first resilient coupling and a second resilient coupling, the hub being mounted to the shaft for rotation therewith, the first mass being disposed concentrically about the hub, the second mass being disposed concentrically about the hub and the first mass, the first resilient coupling resiliently coupling the first mass to the hub, the second resilient coupling resiliently coupling the second mass directly to the first mass, wherein the first mass and the first resilient coupling are configured to attenuate vibration at the first frequency and wherein the second mass and the second resilient coupling are configured to attenuate vibration at the second frequency.