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POLYMER SPRING CONTROLLED PULLEY ASSEMBLY FOR ROTARY DEVICES

  • US 20100255943A1
  • Filed: 04/07/2009
  • Published: 10/07/2010
  • Est. Priority Date: 04/07/2009
  • Status: Abandoned Application
First Claim
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1. A drive system for a rotary device having a shaft, comprising:

  • a pulley adapted to be rotated by a prime mover, the pulley having a first plurality of radial projections extending from an inner surface of the pulley;

    a hub connected to the shaft and journaled within the pulley, the hub having a second plurality of radial projections extending from an outer surface of the hub, the first and second pluralities of projections being interleaved and forming a plurality of spaces therebetween;

    a pair of annular members located on the hub axially on opposite sides of said projections that together with said projections and said spaces define a plurality of cavities; and

    a plurality of solid resilient polymer spring members disposed in said cavities, said resilient polymer of said spring members being selected from the group consisting of polyether urethanes, polyester urethanes, and co-polyesters of fully polymerized hard segments of crystalline polybutylene-terephthalate (PBT) and soft segments of amorphous polyesters or polyethers, the spring members having a size relative to the cavities such that the spring members engage the first and second projections and, upon sudden relative angular bidirectional velocity changes between the prime mover and shaft and corresponding relative angular rotation of the pulley and the hub, the projections resiliently deform said spring members within said cavities to dampen the impact of said velocity changes on the shaft until a predetermined maximum relative angular rotation is reached.

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