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Multiple speed automatic transmission

  • US 20080182704A1
  • Filed: 01/25/2007
  • Published: 07/31/2008
  • Est. Priority Date: 01/25/2007
  • Status: Active Grant
First Claim
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1. A multiple-speed automatic transmission comprising:

  • an input;

    an output;

    a first gear unit drivable connected to the input and including a component rotating at the speed of the input and a first gear unit output, the first gear unit producing a gear ratio of a speed of the input and a speed of a first gear unit output, the gear ratio being greater than unity;

    a Ravigneaux gear unit for producing multiple ratios of the speed of the input and a speed of the output, the Ravigneaux gear unit being driveably connected to first, second, third, fourth, fifth, and sixth rotating members and the output;

    a second clutch being operable to connect the first gear unit output and the second rotating member;

    a third clutch being operable to connect the third rotating member and one of the input and the rotating component;

    a fourth clutch being operable to connect the fourth rotating member and one of the input and the component;

    a first brake being operable to hold the fifth rotating member against rotation; and

    a second brake being operable to hold the sixth rotating member against rotation.

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