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Multiple-speed automatic transmission

  • US 20070037657A1
  • Filed: 08/15/2005
  • Published: 02/15/2007
  • Est. Priority Date: 08/15/2005
  • Status: Active Grant
First Claim
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1. A multi-speed automatic transmission comprising:

  • an input;

    an output;

    a first power path producing a first ratio of a speed of the input and a speed of a first power path output;

    a second power path producing a second ratio of a speed of the input and a speed of the second power path output, the second ratio being less than the first ratio;

    a double planetary gear unit secured to first, second, third and fourth members, the second member being secured to the output for rotation therewith, a first clutch being operable to connect the first member to the input through the first power path;

    a second clutch being operable to connect the fourth member to the input through the first power path;

    a third clutch being operable to connect the third member to the input through the second power path;

    a fourth clutch being operable to connect the fourth member to the input through the second power path;

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

    a second brake being operable to hold the third member against rotation

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