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Multiple speed automatic transmission

  • US 7,686,730 B2
  • Filed: 11/09/2006
  • Issued: 03/30/2010
  • Est. Priority Date: 11/09/2006
  • Status: Active Grant
First Claim
Patent Images

1. A transmission for automotive vehicles, comprising:

  • an input and an output;

    a first, second, third and fourth planetary gear sets, each gear set including a sun gear, a ring gear, a carrier, and pinions supported on the carrier and meshing with the sun gear and the ring gear;

    the carrier of the first gear set being secured to the carrier of the second gear set;

    the ring gear of the first gear set being secured to the sun gear of the second gear set;

    the ring gear of the second gear set being secured to the ring gear of the third gear set;

    the sun of the third gear set and the sun gear of the fourth gear set being secured mutually;

    the carrier of the third gear set and the ring gear of the fourth gear set being secured mutually;

    the carrier of the fourth gear set and the output being secured mutually;

    a first clutch for alternately driveably connecting and disconnecting the input to the sun gear of the third gear set and sun gear of the fourth gear set;

    a second clutch for alternately driveably connecting and disconnecting the input to the carrier of the third gear set and ring gear of the fourth gear set;

    a third clutch for alternately driveably connecting and disconnecting the input to the sun gear of the second gear set and ring gear of the first gear set;

    a first brake for holding the sun gear of the first gear set against rotation; and

    a second brake for holding the carrier of the first gear set and the carrier of the second gear set against rotation.

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