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Continuously variable planetary gear set

  • US 7,452,297 B2
  • Filed: 08/07/2007
  • Issued: 11/18/2008
  • Est. Priority Date: 08/11/2003
  • Status: Expired due to Term
First Claim
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1. A drive train comprising:

  • a motor-generator;

    a plurality of balls, each ball having an internal, tiltable axis of rotation;

    a first disc in contact with the balls, the first disc configured to be selectively coupled to the motor-generator;

    a second disc in contact with the balls; and

    a rotatable cage configured to support the plurality of balls axially and radially.

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