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US 2014/0274546 A1Published application
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorsEdward W. Mellet, James M. Hart, Andrew W. Phillips
Life of this patent
Estimating the term…
Abstract
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 torque transmitting devices include clutches and brakes actuatable in combinations of three to establish a plurality of forward gear ratios and at least one reverse gear ratio.
Claims22
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- three interconnecting members continuously interconnecting 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;
- and
- six torque transmitting mechanisms wherein four of the six torque transmitting mechanisms are each 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 wherein two of the six torque transmitting mechanisms are each selectively engageable to interconnect at least one of the first, second and third members with the stationary member, and
- wherein the 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.
4 more elements
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the second member of the third planetary gear set and the first member of the fourth planetary gear set;
- a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the first member of the second planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the third member of the third planetary gear set;
- and
- six torque transmitting mechanisms each 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 the stationary member, and
- wherein the 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.
6 more elements
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having a sun gear, a carrier member and a ring gear, wherein the input member is continuously connected for common rotation with the carrier member of the second planetary gear set, and wherein the output member is continuously connected for common rotation with the carrier member of the fourth planetary gear set;
- a first interconnecting member continuously interconnecting the carrier member of the first planetary gear set with the carrier member of the third planetary gear set and the ring gear of the fourth planetary gear set;
- a second interconnecting member continuously interconnecting the sun gear of the first planetary gear set with the sun gear of the second planetary gear set;
- a third interconnecting member continuously interconnecting the ring gear of the second planetary gear set with the sun gear of the third planetary gear set;
- a first torque transmitting mechanism selectively engageable to interconnect the carrier member of the second planetary gear set and the input member with the sun gear of the fourth planetary gear set;
- a second torque transmitting mechanism selectively engageable to interconnect the sun gear of the third planetary gear set with the sun gear of the fourth planetary gear set;
- a third torque transmitting mechanism selectively engageable to interconnect the ring gear of the third planetary gear set with the sun gear of the fourth planetary gear set;
- a fourth torque transmitting mechanism selectively engageable to interconnect the ring gear of the third planetary gear set with the carrier member of the fourth planetary gear set;
- a fifth torque transmitting mechanism selectively engageable to interconnect the ring gear of the first planetary gear set with the stationary member;
- and
- a sixth torque transmitting mechanism selectively engageable to interconnect the sun gear of the first planetary gear set with 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.
11 more elements
Dependencies are inferred from the claim text.