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Traction drive transmission

  • US 6,095,940 A
  • Filed: 02/12/1999
  • Issued: 08/01/2000
  • Est. Priority Date: 02/12/1999
  • Status: Expired due to Term
First Claim
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1. A planetary traction drive transmission that is organized around a center axis, said transmission comprising:

  • a center shaft having first and second inner raceways that are presented away from the center axis;

    an outer ring having first and second outer raceways presented toward the center axis, with the first outer raceway generally surrounding the first inner raceway and the second outer raceway generally surrounding the second inner raceway;

    first rollers located between and having peripheral surfaces which contact the first inner and outer raceways and second rollers located between and having peripheral surfaces which contact the second inner and outer raceways, the first and second rollers also having back faces and opposite end faces and being arranged in pairs, with each pair including one of the first rollers and one of the second rollers, the rollers of each pair having their back faces contacting each other such that the first roller of the pair backs of the second roller of the pair and vice versa; and

    a roller carrier coupled with the first and second rollers, the roller carrier including first and second end disks located the opposite end faces of the first and second rollers, respectively, and axles extending from the end disks into the rollers; and

    wherein substantially pure rolling contact characterized by the absence of spinning exists between the peripheral surfaces of the first rollers and the first inner and outer raceways and between the peripheral surfaces of the second rollers and the second inner and outer raceways and between the back faces of the rollers of each pair, when the rollers of each pair revolve between the center shaft and the outer ring.

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