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Multi-speed transmission with countershaft gearing arrangement

  • US 7,987,740 B2
  • Filed: 09/03/2008
  • Issued: 08/02/2011
  • Est. Priority Date: 09/03/2008
  • Status: Expired due to Fees
First Claim
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1. A transmission comprising:

  • an input member;

    an output member;

    a first interconnecting member;

    a second interconnecting member;

    a dual clutch assembly for selectively coupling the input member with the first interconnecting member and the second interconnecting member;

    first, second, third, and fourth gear sets each having a first gear intermeshed with a second gear and a third gear, wherein the first and second gear sets are continuously interconnected with the first interconnecting member, the third and fourth gear sets are continuously interconnected with the second interconnecting member;

    a fifth gear set having a first gear and a second gear;

    a first countershaft continuously connected to the fifth gear set;

    a second countershaft continuously connected to the fifth gear set;

    a reverse shaft having a fourth gear intermeshed with at least one of the second, third and fourth gear sets; and

    five synchronizer assemblies each for selectively coupling at least one of the first, second, third, and fourth gear sets with at least one of the first countershaft, the second countershaft, and the reverse shaft, andwherein the five synchronizer assemblies and the dual clutch assembly are selectively engageable to establish a plurality of forward speed ratios and at least one reverse speed ratio between the input member and the output member.

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