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MULTI-SPEED TRANSMISSION

  • US 20100323842A1
  • Filed: 08/30/2010
  • Published: 12/23/2010
  • Est. Priority Date: 06/08/2007
  • 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 torque transmitting device selectively engageable to interconnect the first member of the first planetary gear set with at least one of the first member of the second planetary gear set, the first member of the third planetary gear set, and the first member of the fourth planetary gear set;

    a second torque transmitting device selectively engageable to interconnect the first member of the first planetary gear set with the third member of the fourth planetary gear set;

    a third torque transmitting device selectively engageable to interconnect the third member of the third planetary gear set with at least one of the first member of the second planetary gear set, the first member of the third planetary gear set, and the first member of the fourth planetary gear set;

    a fourth torque transmitting device selectively engageable to interconnect the third member of the third planetary gear set with at least one of the second member of the fourth planetary gear set and the output member; and

    a fifth torque transmitting device selectively engageable to interconnect the third member of the fourth planetary gear set with a stationary member, andwherein at least two of the torque transmitting devices are disengaged to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.

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