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US 8,556,766 B2Granted
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorsEdward W. Mellet, James M. Hart, Andrew W. Phillips, Scott H. Wittkopp
Life of this patent
Estimating the term…
Abstract
A transmission includes an input and output member, four planetary gear sets each having first, second and third members, five interconnecting members continuously interconnecting members of the four planetary gear sets and six torque transmitting mechanisms selectively engageable to interconnect one of the first members, second members, and third members with at least one of another of the first members, second members, third members, and a stationary member. The torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.
Claims32
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 second planetary gear set;
- a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the third member of the second planetary gear set and the first member of the third planetary gear set;
- a third interconnecting member continuously interconnecting the second member of the third planetary gear set with the third member of the fourth planetary gear set;
- a fourth interconnecting member continuously interconnecting the third member of the third planetary gear set with the second member of the fourth planetary gear set;
- and
- six torque transmitting mechanisms each selectively engageable to interconnect one of the first members, second members, and third members of the planetary gear sets with another one of the first members, second members, third members of the planetary gear sets, and a stationary member, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.
7 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, wherein the input member is continuously interconnected with the first member of the second planetary gear set and the output member is continuously interconnected with 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 second member of the second planetary gear set;
- a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the third member of the second planetary gear set and the first member of the third planetary gear set;
- a third interconnecting member continuously interconnecting the second member of the third planetary gear set with the third member of the fourth planetary gear set;
- a fourth interconnecting member continuously interconnecting the third member of the third planetary gear set with the second member of the fourth planetary gear set;
- and
- six torque transmitting mechanisms each selectively engageable to interconnect one of the first members, second members, and third members of the planetary gear sets with another one of the first members, second members, third members of the planetary gear sets, and a stationary member, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.
7 more elements
A transmission comprising:
- an input member;
- an output member;
- a transmission housing;
- first, second, third and fourth planetary gear sets each having sun gear, a carrier member and a ring gear, wherein the input member is continuously interconnected with the sun gear of the second planetary gear set and the output member is continuously interconnected with the ring gear of the third planetary gear set;
- a plurality of interconnecting members each drivingly connecting one of the first, second, and third members of the planetary gear sets with another one of the first, second, and third members of the planetary gears sets;
- a first torque transmitting mechanism selectively engageable to interconnect the sun gear of the first planetary gear set with the transmission housing;
- a second torque transmitting mechanism selectively engageable to interconnect the ring gear of the first planetary gear set with the transmission housing;
- a third torque transmitting mechanism selectively engageable to interconnect the sun gear of the third planetary gear set with the transmission housing;
- a fourth torque transmitting mechanism selectively engageable to interconnect the carrier member of the third planetary gear set with the transmission housing;
- a fifth torque transmitting mechanism selectively engageable to interconnect the ring gear of the fourth planetary gear set with the sun gear of the second planetary gear set;
- and
- a sixth torque transmitting mechanism selectively engageable to interconnect the sun gear of the fourth planetary gear set with the sun gear of the second planetary gear set, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.
10 more elements
Dependencies are inferred from the claim text.