Patent ID: 7862437

Claim:
A torsional damper assembly for absorbing and attenuating torsionals and vibrations transmitted to a power transmission, the torsional damper assembly comprising: a damper flange having an outer periphery; at least one spring-mass damper system elongated circumferentially about said outer periphery of said damper flange and operatively attached thereto, said at least one spring-mass damper system including: an inner spring defining first inner and outer diameters; an outer spring defining second inner and outer diameters, said second inner diameter being sufficiently larger than said first outer diameter to allow said inner spring to be nestably positioned inside said outer spring; a first spring retainer having a first base portion defining a first interface surface, a first pilot portion extending from said first interface surface and defining a second interface surface, and a second pilot portion extending from said second interface surface; and a second spring retainer having a second base portion defining a third interface surface, and a third pilot portion extending from said third interface surface and defining a fourth interface surface; wherein said first and third interface surfaces are engaged with said outer spring, and said second and fourth interface surfaces are engaged with said inner spring; wherein said first and third pilot portions are engaged with and thereby restrict axial and radial movement of said outer spring; wherein said second pilot portion is operatively attached to and thereby restricts movement of said inner spring relative to said second pilot portion; and wherein said inner spring is sufficiently shorter than said outer spring such that the inner spring does not contact the second spring retainer.