×

Multispeed automatic transmission for automobile vehicles

  • US 5,106,352 A
  • Filed: 12/10/1990
  • Issued: 04/21/1992
  • Est. Priority Date: 12/18/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. A multispeed automatic transmission, in particular for automobile vehicles, comprising between an input shaft and an output shaft and housed in a casing:

  • a first power bath having a first fixed speed ratio and including a first control clutch and a second control clutch,a second power path having a second fixed speed ratio, higher than said first fixed speed ratio and in the same direction, and including a third control clutch, andfirst and second control brakes being associated with respective ones of said power paths,a double planetary gearset, concentric with the output shaft and including in order of rotational speed, first, second, third and fourth members, said first control clutch being operable to couple said first member to the input shaft through said first power path, said second member being fixed for rotation with the output shaft, said third control clutch being operable to couple said third member to the input shaft through said second power path, said first control brake being operable to fix said third member against rotation, said second control clutch being operable to couple said fourth member to the input shaft through said first power path, and said second control brake being operable to fix said fourth member against rotation, said transmission providing six forward gears, a braked neutral position and a reverse drive by selective operation in pairs of said first, second and third control clutches and said first and second control brakes, said first control clutch and said first control brake being operable to define a first forward gear, said first control clutch and said second control brake being operable to define a second forward gear, said first control clutch and said second control clutch being operable to define a third forward gear, said first control clutch and said third control clutch being operable to define a fourth forward gear, said second control clutch and said third control clutch being operable to define a fifth forward gear, said third control clutch and said second control brake being operable to define a sixth forward gear, said first and second control brakes being operable to define a braked neutral position, and said second control clutch and said first control brake being operable to define reverse drive.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×