Patent ID: 8021262
Filing Date: 2011-09-20
Classification: F16H

Abstract:
1. A multi-speed transmission comprising: an input member; an output member; first, second and third planetary gear sets each having first, second and third members; a first interconnecting member continuously connecting said second member of said first planetary gear set with said second member of said third planetary gear set; a second interconnecting member continuously connecting said third member of said first planetary gear set with said second member of said second planetary gear set; said first member of said first planetary gear set being continuously connected with a stationary member; six torque-transmitting devices each for selectively interconnecting a respective one of said members of said planetary gear sets with said input member, with said stationary member or with another respective one of said members of said planetary gear sets for rotation at a respective common speed, said six torque-transmitting devices being engaged in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio between said input member and said output member; wherein one of said six torque-transmitting mechanisms is selectively engagable to directly connect said third member of said second planetary gear set with said first member of said second planetary gear set for rotation at the same speed; wherein another of said six torque-transmitting devices is selectively engagable to directly connect said second member of said first planetary gear set with said input member for rotation at a speed of the input member; wherein a first of said six torque-transmitting devices is operable for selectively connecting said second member of said first planetary gear set with said stationary member; wherein a second of said six torque-transmitting devices is operable for selectively connecting said third member of said second planetary gear set with said third member of said third planetary gear set; wherein said one of said torque-transmitting devices is said third of said six torque-transmitting devices; wherein a fourth of said six torque-transmitting devices is operable for selectively connecting said first member of said second planetary gear set with said input member; and wherein a fifth of said six torque-transmitting devices is operable for selectively connecting said first member of said third planetary gear set with said third member of said second planetary gear set, said fifth of said six torque-transmitting devices being engaged in at least two of said at least eight forward speed ratios.