Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorsEdward W. Mellet, James B. Borgerson, James M. Hart
Life of this patent
Estimating the term…
Abstract
A transmission of the present invention has an input member, an output member, 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 may include clutches and brakes. The torque transmitting devices are each selectively engageable in combinations of at least three to establish a plurality of forward speed ratios and at least one reverse speed ratio.
Claims50
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- five interconnecting members each continuously interconnecting one of the members of the first, second, third and fourth planetary gear sets with another member the first, second, third and fourth planetary gear sets;
- and
- seven torque transmitting devices each selectively engageable to interconnect at least one of the first, second, and third members with at least one other of the first members, second members, third members and a stationary member, and
- wherein the torque transmitting devices 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 transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- five interconnecting members each continuously interconnecting one of the members of the first, second, third and fourth planetary gear sets with another member the first, second, third and fourth planetary gear sets;
- a first torque transmitting device selectively engageable to interconnect the first member of the first planetary gear set with the input member;
- a second torque transmitting device selectively engageable to interconnect the second member of the first planetary gear set with the input member;
- a third torque transmitting device selectively engageable to interconnect the third member of the third planetary gear set with the input member;
- a fourth torque transmitting device selectively engageable to interconnect the first member of the first planetary gear set with a stationary member;
- a fifth torque transmitting device selectively engageable to interconnect the second member of the second planetary gear set with the stationary member;
- a sixth torque transmitting device selectively engageable to interconnect the first member of the second planetary gear set with the stationary member;
- and
- a seventh torque transmitting device selectively engageable to interconnect the first member of the third planetary gear set with the stationary member, and
- wherein the torque transmitting devices are each 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 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,
- four interconnecting members each continuously interconnecting one of the sun gear, carrier member, and ring gear of the one of the first, second, third and fourth planetary gear sets with another one of the sun gear, carrier member, and ring gear of the first, second, third and fourth planetary gear sets;
- seven torque transmitting devices each selectively engageable to interconnect one of the sun gear, carrier member, and ring gear of the one of the first, second, third and fourth planetary gear sets with another one of the sun gear, carrier member, and ring gear of the one of the first, second, third and fourth planetary gear sets, a stationary member, and the input member, and
- wherein the torque transmitting devices are each selectively engageable in combinations of at least three to establish at least eleven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
The transmission of claim 37 wherein a second of the four interconnecting members continuously interconnects the carrier member of the first planetary gear set with the ring gear of the second planetary gear set and the sun gear of the third planetary gear set.
The transmission of claim 38 wherein a third of the four interconnecting members continuously interconnects the carrier member of the third planetary gear set with the carrier member of the fourth planetary gear set.
The transmission of claim 39 wherein a fourth of the four interconnecting members continuously interconnects the ring gear of the third planetary gear set with the ring gear of the fourth planetary gear set.
Dependencies are inferred from the claim text.