MULTI-SPEED TRANSMISSION HAVING A REDUCTION PLANETARY GEAR SET

摘要

A transmission is provided having an input member, an output member, two planetary gear sets one of which is a selectively speed reducing gear set, another two planetary gear sets that may be stacked or nested to form a planetary gear set assembly, 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 stacked or nested planetary gear set assembly has a carrier member for rotatably supporting a first plurality of pinion gears and a second plurality of pinion gears, a ring gear and a common gear member. The torque transmitting devices include clutches and brakes.

主权项

1. A transmission comprising:
an input member; an output member; a planetary gear set assembly having a first member, a second member, a third member and a fourth member; a first planetary gear set having a first, a second and a third member; a first interconnecting member continuously interconnecting the second member of the planetary gear set assembly with the first member of the first planetary gear set; a second planetary gear set having a first, a second and a third member; a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the third member of the second planetary gear set and wherein the second planetary gear set is configured to selectively reduce a rotational speed of the output member relative to a rotational speed of the second interconnecting member; and seven torque transmitting mechanisms selectively engageable to interconnect at least one of the members of the planetary gear set assembly, one of the members of the first and second planetary gear sets with at least one other of the members of the planetary gear set assembly, one other of the members of the first and second planetary gear sets, the input member, the output member and the stationary member, and wherein the 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.