Multiple-speed automatic transmission for an automotive vehicle

摘要

A kinematic arrangement of an automatic transmission includes three planetary gear units having certain of their elements fixed to other elements mutually, a one-way coupler for holding the sun gear of the first gear unit, a clutch arranged in parallel with the coupler, a friction clutch driveably connecting a transmission input shaft to the sun gear of the first gear unit, a second friction clutch for driveably connecting the pinion carriers of the second and third gear units to the input shaft, a friction brake for holding the sun gear of the second gear unit against rotation, and a brake band for selectively holding the pinion carriers of the second and third gear units against rotation.