Family of multi-speed planetary transmission mechanisms having three planetary gearsets, three clutches, and two brakes

摘要

The family of six-speed planetary transmissions incorporates three planetary gearsets and five torque-transmitting mechanisms, which are engaged in combinations of two to establish at least six forward speeds and one reverse speed within the planetary transmission. The five torque-transmitting mechanisms are comprised of three rotating type torque-transmitting mechanisms (clutches) and two stationary type torque-transmitting mechanisms (brakes). Each of the three planetary gearsets has three members with a first member of the first planetary gearset being continuously interconnected with a first member of the second planetary gearset. A second member of the first planetary gearset is continuously interconnected with a first member of the third planetary gearset. A second member of the second planetary gearset is continuously interconnected with a second member of the third planetary gearset. The input shaft and output shafts are continuously connected with selected members of the planetary gearsets. The five torque-transmitting mechanisms are effective to provide interconnections between the planetary gearsets as well as between the planetary gearset members and the transmission housing to establish the forward and reverse speed ratios.