F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/116
F16H 47/08 (2006.01) F16H 3/66 (2006.01) F16H 61/14 (2006.01)
Patent
CA 1114649
ABSTRACT OF THE DISCLOSURE A transmission having a torque converter, lockup clutch, and a 5-speed planetary transmission having four planetary gearsets and six friction drive-establishing devices combined to provide five forward speed range drives having a large total gear ratio step, and a reverse drive having a moderate and a high gear ratio. The 1st or primary gearsets with the primary input to the sun gear, the ring gear braked, and carrier output, provides 1st range drive having the largest torque multiplication gear ratio. The 2nd, 3rd, and 4th gearsets, the secondary gearsets, are used to provide a secondary input having decreasing torque multi- plication gear ratios, to the ring gear of the 1st gearsets which, with the primary input to the sun gear, provides 2nd through 5th range drives having decreasing gear ratios. The gear ratio steps between 1st, 2nd, and 3rd ranges are wide, and between 3rd, 4th, and 5th ranges are very close. The automatic controls provide torque converter drive in a portion or all of 1st and 2nd range drives and in a portion of 3rd range drive up to a transition output speed, and lockup drive above the transition output speed in 3rd range drive and all of 4th and 5th range drives, to maintain engine speed within a small engine working speed range between the peak torque speed and maximum governed speed.
333679
General Motors Corporation
Gowling Lafleur Henderson Llp
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