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Nine speed automatic transmission

  • US 8,388,485 B2
  • Filed: 02/13/2012
  • Issued: 03/05/2013
  • Est. Priority Date: 07/31/2007
  • Status: Expired due to Fees
First Claim
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1. A multiple speed automatic transmission comprising:

  • an input member;

    an output member;

    a first, a second, a third and a fourth planetary gear assembly each having a first, a second and a third member;

    a first and a second chain drive assembly each having a pair of sprockets and a sprocket engaging chain;

    a first connecting member continuously connecting the first member of the first planetary gear assembly with a first of the pair of sprockets of the second chain drive assembly;

    a second connecting member continuously connecting to the second member of the first planetary gear assembly;

    a third connecting member continuously connecting the second member of the first planetary gear assembly with a first of the pair of sprockets of the first chain drive assembly;

    a fourth connecting member continuously connecting to the second member of the second planetary gear assembly;

    a fifth connecting member continuously connecting the third member of the second planetary gear assembly with the first member of the third planetary gear assembly;

    a sixth connecting member continuously connecting a second of the pair of sprockets of the second chain drive assembly with the first member of the second planetary gear assembly;

    a seventh connecting member continuously connecting a second of the pair of sprockets of the first chain drive assembly with the first member of the fourth planetary gear assembly;

    an eighth connecting member continuously connecting the second member of the second planetary gear assembly with the second member of the third planetary gear assembly;

    a first torque transmitting device selectively connecting the first member of the first planetary gear assembly with the input member;

    a second torque transmitting device selectively connecting the second member of the first planetary gear assembly with the input member;

    a third torque transmitting device selectively connecting the third member of the first planetary gear assembly to the input member;

    a fourth torque transmitting device selectively connecting the third member of the first planetary gear assembly to a ground;

    a fifth torque transmitting device selectively connecting the second member of the second planetary gear assembly with the ground;

    a sixth torque transmitting device selectively connecting the first member of the third planetary gear assembly and the third member of the second planetary gear assembly with the ground;

    a seventh torque transmitting device selectively connecting the first member of the second planetary gear assembly with the second member of the second planetary gear assembly;

    an eighth torque transmitting device selectively connecting the third member of the fourth planetary gear assembly with the ground; and

    a ninth torque transmitting device selectively connecting the third member of the fourth planetary gear assembly with the first member of the fourth planetary gear assembly, andwherein the output member is continuously connected to the third member of the third planetary gear assembly and the second member of the fourth planetary gear assembly and the torque transmitting devices are engageable in combinations of at least two to establish at least nine forward gear ratios and one reverse gear ratio.

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