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US 8,708,860 B2Granted
Multi-speed transmission having three planetary gear sets
AssigneeGM Global Technology Operations LLC
InventorsJames M. Hart, James B. Borgerson
Life of this patent
Estimating the term…
Abstract
A transmission includes an input member, an output member, three 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.
Claims26
A transmission comprising:
- an input member;
- an output member;
- first, second and third planetary gear sets, wherein the first planetary gear set includes a first and a second member, the second and third planetary gear sets include a first, second, and third member, the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;
- a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the first member of the second planetary gear set;
- a second interconnecting member continuously interconnecting the second member of the second planetary gear set with the first member of the third planetary gear set;
- and
- five torque transmitting mechanisms each selectively engageable to interconnect at least one of the first, second and third members of the first, second and third planetary gear sets with at least one other of the first, second, third members and a stationary member, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member the first planetary gear set further includes a first set of pinion gears and the second planetary gear set includes a second set of pinion gears, the first and second set of pinion gears are rotatable supported by the first member of the second planetary gear set and the second member of the first planetary gear set, the first set of pinion gears mesh with the first member of the first planetary gear set, the second member of the second planetary gear set, and the second set of pinion gears, and the second set of pinion gears mesh with each of the third member of the second planetary gear set and the first set of pinion gears.
5 more elements
A transmission comprising:
- an input member;
- an output member;
- first, second and third planetary gear sets, wherein the first planetary gear set includes a first and a second member, the second and third planetary gear sets include a first, second, and third member, the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;
- two interconnecting members each selectively engageable to interconnect one of the first, second and third members of the first, second and third planetary gear sets with one other of the first, second, third members of the first, second and third planetary gear sets;
- a first torque transmitting mechanism selectively engageable to interconnect the first member of the first planetary gear set with the second member of the third planetary gear set;
- a second torque transmitting mechanism selectively engageable to interconnect the first interconnecting member with the second member of the third planetary gear set;
- a third torque transmitting mechanism selectively engageable to interconnect at least one of the second interconnecting member and the third interconnecting member with a stationary member;
- a fourth torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set with the stationary member;
- a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with the stationary member, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member, the first planetary gear set further includes a first set of pinion gears and the second planetary gear set includes a second set of pinion gears, the first and second set of pinion gears are rotatably supported by the first member of the second planetary gear set and the second member of the first planetary gear set, the first set of pinion gears mesh with the first member of the first planetary gear set, the second member of the second planetary gear set, and the second set of pinion gears, and the second set of pinion gears mesh with each of the third member of the second planetary gear set and the first set of pinion gears.
7 more elements
A transmission comprising:
- an input member;
- an output member;
- first, second and third planetary gear sets, wherein the first planetary gear set includes a first and a second member and a first set of pinion gears, the second planetary gear set includes a first, second, and third member and a second set of pinion gears, the third planetary gear set includes a first, second and third member, the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;
- a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the first member of the second planetary gear set;
- a second interconnecting member continuously interconnecting the second member of the second planetary gear set with the first member of the third planetary gear set;
- a first torque transmitting mechanism selectively engageable to interconnect the first member of the first planetary gear set with the second member of the third planetary gear set;
- a second torque transmitting mechanism selectively engageable to interconnect the first interconnecting member with the second member of the third planetary gear set;
- a third torque transmitting mechanism selectively engageable to interconnect at least one of the second interconnecting member and the third interconnecting member with the stationary member;
- a fourth torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set with the stationary member;
- a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with the stationary member, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member, the first and second set of pinion gears are rotatably supported by the first member of the second planetary gear set and the second member of the first planetary gear set, the first set of pinion gears mesh with the first member of the first planetary gear set, the second member of the second planetary gear set, and the second set of pinion gears, and the second set of pinion gears mesh with each of the third member of the second planetary gear set and the first set of pinion gears.
8 more elements
Dependencies are inferred from the claim text.