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Eight speed automatic transmission

  • US 8,435,152 B2
  • Filed: 04/16/2012
  • Issued: 05/07/2013
  • Est. Priority Date: 04/02/2007
  • Status: Expired due to Fees
First Claim
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1. An automatic transmission comprising;

  • a transmission housing having a first wall, a second wall and a third wall extending between said first and said second walls;

    a first, a second, a third and a fourth planetary gear assembly disposed within said transmission housing, wherein said second planetary gear assembly is adjacent said first wall, said third planetary gear assembly is adjacent said second planetary gear assembly, said first planetary gear assembly is adjacent said third planetary gear assembly and said fourth planetary gear assembly is between said first planetary gear assembly and said second wall, each of said planetary gear assemblies including a sun gear member, a ring gear member and a planet carrier member supporting a plurality of planet gears meshing with said sun gear member and said ring gear member;

    an input member coupled to said planet carrier of said first planetary gear assembly, wherein said input member is partially disposed radially outward of said first, second, and third planetary gear assemblies;

    an output member coupled to said planet carrier of said third planetary gear assembly, wherein said output member is partially disposed radially inward of said first and fourth planetary gear assemblies;

    a first interconnecting member continuously directly coupling said ring gear member of said third planetary gear assembly with said planet carrier of said fourth planetary gear assembly, wherein said first interconnecting member is partially disposed between said first and said third planetary gear assemblies radially outward of said output member, and partially disposed radially inward of said first and fourth planetary gear assemblies radially outward of said output member;

    a second interconnecting member continuously directly coupling said sun gear member of said first planetary gear assembly with said sun gear member of said fourth planetary gear assembly, wherein said second interconnecting member is partially disposed between said first and fourth planetary gear assemblies radially outward of said first interconnecting member;

    a third interconnecting member continuously directly coupling said sun gear member of said second planetary gear assembly with said sun gear member of said third planetary gear assembly, wherein said third interconnecting member is partially disposed between said second and third planetary gear assemblies;

    a fourth interconnecting member continuously directly coupling said ring gear member of said first planetary gear assembly with said planet carrier of said second planetary gear assembly, wherein said fourth interconnecting member is partially disposed radially inward of said input member and radially outward of said second planetary gear assembly, said third planetary gear assembly, and said first interconnecting member;

    first, second, and third clutches each selectively engageable to interconnect at least one of said members of at least one of said planetary gear assemblies with at least one other of said members of at least one of said planetary gear assemblies; and

    first and second brakes each selectively engageable to interconnect said transmission housing with at least one of said members of at least one of said planetary gear assemblies, andwherein said clutches and brakes are selectively engageable to establish at least eight forward speed ratios and one reverse speed ratio between said input member and said output member.

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