Multiple-speed automatic transmission for an automotive vehicle

Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural elements selectively braked

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Details

475276, 475281, F16H 362

Patent

active

057162980

ABSTRACT:
A multiple-speed automatic transmission includes two simple planetary gear units and a third double planetary gear unit having two sets of planet pinions engaged mutually, one of the sets engaged continually with a sun gear and the other set engaged continually with a ring gear. An input shaft is driveably connected to the carrier of the double gear unit and to the sun gear of a first simple gear unit. The output is taken on a common element driveably connected to the ring gear of the second gear unit, carrier of the first gear unit, and an output shaft. The sun gear of the double gear unit is permanently fixed against rotation. A first brake is adapted to hold the sun gear of the second gear unit against rotation and a brake band is adapted to hold the carrier of the second gear unit against rotation. A first friction clutch connects the ring gear of the third gear unit, sun gear of the second gear unit, and carrier of the third gear unit mutually. A second clutch driveably connects the ring gear of the second gear unit to the input shaft, and another clutch driveably connects the carrier of the double planetary gear unit and carrier of the second gear unit.

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