| 摘要 |
A planetary gearing arrangement for automotive transmissions wherein a fourth simple planetary gear set and a fourth brake are added to a gearing arrangement containing three simple planetary gear sets, three brakes and two clutches. In the fourth planetary gear set, the sun gear is connected to the input shaft, the carrier is connected to the fourth brake, and the ring gear is connected to the carrier and to the ring gear of two of the planetary gear sets described in the above-mentioned patent. The gearing arrangement of this invention achieves nine forward speed ranges and one reverse speed range with only single transition shifts and also has the capability for small, evenly spaced ratio steps including a first forward ratio low enough to permit use of the gearing arrangement without a torque converter. |
