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US 2015/0087467 A1Published application
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorTejinder Singh
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, a one-way clutch and brakes actuatable in combinations of two to establish a plurality of forward gear ratios and at least one reverse gear ratio.
Claims26
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
- eight torque transmitting mechanisms wherein three of the eight 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 five of the eight torque transmitting mechanisms are each selectively engageable to interconnect at least one of the first, second and third members with a stationary member, and
- wherein the eight torque transmitting mechanisms are selectively engageable in combinations of at least two 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 and wherein the third member of the third planetary gear set rotatably supports a first and a second set of planet gears;
- a first interconnecting member continuously interconnecting the first member of the first planetary gear set with the second member of the third planetary gear set;
- 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 the third member of the fourth planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the third planetary gear set with the second member of the second planetary gear set and the second member of the fourth planetary gear set;
- and
- eight 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 a stationary member, and
- wherein the eight torque transmitting mechanisms are selectively engageable in combinations of at least two 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 sun gear of the third planetary gear set, and wherein the output member is continuously connected for common rotation with the carrier member of the first planetary gear set;
- a first interconnecting member continuously interconnecting the ring gear of the first planetary gear set with the ring gear of the third planetary gear set;
- a second interconnecting member continuously interconnecting the carrier member of the first planetary gear set with the ring gear of the second planetary gear set and the ring gear of the fourth planetary gear set;
- a third interconnecting member continuously interconnecting the carrier member of the third planetary gear set with the carrier member of the second planetary gear set and the carrier member of the fourth planetary gear set;
- a first torque transmitting mechanism selectively engageable to interconnect the sun gear of the second planetary gear set with the input member and the sun gear of the third planetary gear set;
- a second torque transmitting mechanism selectively engageable to interconnect the carrier member of the second planetary gear set, the carrier member of the third planetary gear set and the carrier member of the fourth planetary gear set with the input member and the sun gear of the third planetary gear set;
- a third torque transmitting mechanism selectively engageable to interconnect the sun gear of the second planetary gear set with the sun gear of the fourth planetary gear set;
- a fourth torque transmitting mechanism selectively engageable to interconnect the sun gear of the second planetary gear set with the stationary member;
- a fifth torque transmitting mechanism selectively engageable to interconnect the sun gear of the fourth planetary gear set with the stationary member;
- a sixth torque transmitting mechanism selectively engageable to interconnect the carrier member of the third planetary gear set, the carrier member of the second planetary gear set and the carrier member of the fourth planetary gear set with the stationary member;
- a seventh torque transmitting mechanism configured as a one-way clutch selectively engageable to interconnect the carrier member of the third planetary gear set, the carrier member of the second planetary gear set and the carrier member of the fourth planetary gear set with the stationary member;
- an eighth 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 two to establish a plurality of forward speed ratios and at least one reverse speed ratio between the input member and the output member.
12 more elements
Dependencies are inferred from the claim text.