Patent ID: 7686730
Filing Date: 2010-03-30
Classification: F16H

Abstract:
1. A transmission for automotive vehicles, comprising: an input and an output; a first, second, third and fourth planetary gear sets, each gear set including a sun gear, a ring gear, a carrier, and pinions supported on the carrier and meshing with the sun gear and the ring gear; the carrier of the first gear set being secured to the carrier of the second gear set; the ring gear of the first gear set being secured to the sun gear of the second gear set; the ring gear of the second gear set being secured to the ring gear of the third gear set; the sun of the third gear set and the sun gear of the fourth gear set being secured mutually; the carrier of the third gear set and the ring gear of the fourth gear set being secured mutually; the carrier of the fourth gear set and the output being secured mutually; a first clutch for alternately driveably connecting and disconnecting the input to the sun gear of the third gear set and sun gear of the fourth gear set; a second clutch for alternately driveably connecting and disconnecting the input to the carrier of the third gear set and ring gear of the fourth gear set; a third clutch for alternately driveably connecting and disconnecting the input to the sun gear of the second gear set and ring gear of the first gear set; a first brake for holding the sun gear of the first gear set against rotation; and a second brake for holding the carrier of the first gear set and the carrier of the second gear set against rotation.