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Multi-speed transmission

  • US 7,695,394 B2
  • Filed: 07/27/2007
  • Issued: 04/13/2010
  • Est. Priority Date: 01/31/2007
  • Status: Active Grant
First Claim
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1. A transmission comprising:

  • an input member;

    an output member;

    first, second, third and fourth planetary gear sets each having first, second and third members;

    a first interconnecting member continuously interconnecting the first member of the first planetary gear set with a stationary element;

    a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the first member of the second planetary gear set;

    a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the second member of the third planetary gear set;

    a fourth interconnecting member continuously interconnecting the first member of the third planetary gear set with the first member of the fourth planetary gear set;

    a fifth interconnecting member continuously interconnecting the third member of the third planetary gear set with the second member of the fourth planetary gear set; and

    five torque-transmitting mechanisms selectively engageable to interconnect one of the first, second, and third members with another of the first, second, and third members and the stationary element; and

    wherein the torque-transmitting mechanisms are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member;

    wherein a first of the five torque transmitting mechanisms is selectively engageable to interconnect the second member of the second planetary gear set with the third member of the fourth planetary gear set.

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