Multi-speed transmission

摘要

A transmission has an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The coupling members continuously interconnect a member of the first, second, third and fourth planetary gear sets with another member of the first, second, third and fourth planetary gear sets. The torque transmitting devices include clutches and brakes selectively engageable to interconnect at least one of the first, second and third members with at least one other of the first, second, third members and a stationary member and are actuatable in combinations of three to establish a plurality of forward gear ratios and one reverse gear ratio.

主权项

1. A transmission comprising:
an input member; an output member; first, second, third and fourth planetary gear sets each having first, second and third members, and wherein the output member is continuously connected for common rotation with the second member of the third planetary gear set and the second member of the first planetary gear set; a plurality of interconnecting members each continuously interconnecting one of the first, second, and third members of the first, second, third and fourth planetary gear sets with another of the first, second, and third members of the first, second, third and fourth planetary gear sets; and at least six torque transmitting mechanisms wherein at least three of the at least six torque transmitting mechanisms are each selectively engageable to interconnect at least one of the first, second and third members of the first, second, third and fourth planetary gear sets with at least one other of the first, second, third members of the first, second, third and fourth planetary gear sets and wherein three of the at least six torque transmitting mechanisms are each selectively engageable to interconnect at least one of the first, second and third members of the first, second, third and fourth planetary gear sets with a stationary member, and wherein the at least six torque transmitting mechanisms are selectively engageable in combinations of at least three to establish a plurality of forward speed ratios and at least one reverse speed ratio between the input member and the output member, a first of the at least six torque transmitting mechanisms is selectively engageable to interconnect the first member of the first planetary gear set with the second member of the fourth planetary gear set and the input member, a second of the at least six torque transmitting mechanisms is selectively engageable to interconnect the third member of the first planetary gear set and the second member of the second planetary gear set with the first member of the third planetary gear set and the first member of the fourth planetary gear set, and a third of the at least six torque transmitting mechanisms is selectively engageable to interconnect the first member of the first planetary gear set with the first member of the third planetary gear set and the first member of the fourth planetary gear set.