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Multi-speed transmission

  • US 9,945,450 B2
  • Filed: 01/21/2016
  • Issued: 04/17/2018
  • Est. Priority Date: 08/07/2014
  • Status: Active Grant
First Claim
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1. A multiple speed transmission, comprising:

  • an input member;

    an output member;

    first, second, third and fourth planetary gearsets each having first, second and third members;

    a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets;

    a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member;

    a second torque-transmitting mechanism selectively engageable to interconnect the second member of the second planetary gearset with the stationary member;

    a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member;

    a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member;

    a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the second planetary gearset, the first member of the third planetary gearset, and the first member of the fourth planetary gearset; and

    a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the second member of the third planetary gearset and the output member;

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

    wherein, there are no more than six torque-transmitting mechanisms.

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