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US 2009/0023540 A1Published application
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorsJames M. Hart, Clinton E. Carey, Andrew W. Phillips, Scott H. Wittkopp, Madhusudan Raghavan
Life of this patent
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Abstract
A transmission is provided having 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.
Claims13
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 first 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 first member of the fourth planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the first member of the third planetary gear set;
- a fourth interconnecting member continuously interconnecting the second member of the third planetary gear set with the second member of the fourth planetary gear set;
- five torque-transmitting mechanisms selectively engageable to interconnect one of the first, second, and third members with another of the first, second, and third members;
- and
- wherein the torque-transmitting mechanisms are selectively engageable in combinations of at least three 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 second member of the first planetary gear set, and the output member is continuously interconnected with the second member of the third planetary gear set and second member of the fourth planetary gear set;
- a first interconnecting member continuously interconnecting the first 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 first member of the fourth planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the first member of the third planetary gear set;
- a fourth interconnecting member continuously interconnecting the second member of the third planetary gear set with the second member of the fourth planetary gear set;
- a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gear set with the first member of the second planetary gear set;
- a second torque-transmitting mechanism selectively engageable to interconnect the third member of the first planetary gear set with the first member of the second planetary gear set;
- a third torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gear set with the third member of the fourth planetary gear set;
- a fourth torque-transmitting mechanism selectively engageable to interconnect to the second member of the second planetary gear set with a stationary member;
- a fifth torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gear set with a stationary member;
- and
- wherein the torque-transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.
11 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 planet carrier and a ring gear, wherein the input member is continuously interconnected with the planet carrier of the first planetary gear set, and the output member is continuously interconnected with the planet carrier of the third planetary gear set and planet carrier of the fourth planetary gear set;
- a first interconnecting member continuously interconnecting the sun gear of the first planetary gear set with the planet carrier of the second planetary gear set;
- a second interconnecting member continuously interconnecting the ring gear of the first planetary gear set with the sun gear of the fourth 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 fourth interconnecting member continuously interconnecting the second member of the third planetary gear set with the second member of the fourth planetary gear set;
- a first torque-transmitting mechanism selectively engageable to interconnect the planet carrier of the first planetary gear set with the sun gear of the second planetary gear set;
- a second torque-transmitting mechanism selectively engageable to interconnect the ring gear of the first planetary gear set with the sun gear of the second planetary gear set;
- a third torque-transmitting mechanism selectively engageable to interconnect the sun gear of the second planetary gear set with the ring gear of the fourth planetary gear set;
- a fourth torque-transmitting mechanism selectively engageable to interconnect to the planet carrier of the second planetary gear set with a stationary member;
- a fifth torque-transmitting mechanism selectively engageable to interconnect the ring gear of the third planetary gear set with a stationary member;
- and
- wherein the torque-transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight 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.