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US 8,167,766 B2Granted
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorsAndrew W. Phillips, James M. Hart, Clinton E. Carey, Scott H. Wittkopp
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 selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio.
Claims20
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 torque transmitting device selectively engageable to connect the third member of the second planetary gear set with the output member;
- a second torque transmitting device selectively engageable to connect the second member of the first planetary gear set with the output member;
- a third torque transmitting device selectively engageable to connect the first member of the third planetary gear set with the first member of the fourth planetary gear set;
- a fourth transmitting device selectively engageable to connect the first member of the third planetary gear set with the second member of the third planetary gear set;
- a fifth torque transmitting device selectively engageable to connect the first member of the fourth planetary gear set with a stationary member;
- a sixth torque transmitting device selectively engageable to connect the second member of the third planetary gear set with the stationary member;
- and
- at least five continuous connections from at least one of the first members, the second members, the third members, and the stationary member to at least one other of the first members, the second members, and the third members, and
- wherein the torque transmitting devices are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
9 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 first members of the first and second planetary gear sets and the third member of the third planetary gear set are connected to form a first rotary member, the second member of the third planetary gear set and the third member of the fourth planetary gear set are connected to form a second rotary member, the second members of the second and fourth planetary gear sets are connected to form a third rotary member, and the third member of the first planetary gear set is continuously connected with a stationary member;
- a first torque transmitting device selectively engageable to connect the third member of the second planetary gear set with the output member;
- a second torque transmitting device selectively engageable to connect the second member of the first planetary gear set with the output member;
- a third torque transmitting device selectively engageable to connect the first member of the third planetary gear set with the first member of the fourth planetary gear set;
- a fourth torque transmitting device selectively engageable to connect the first member of the third planetary gear set with the second rotary member;
- a fifth torque transmitting device selectively engageable to connect the first member of the fourth planetary gear set with the stationary member;
- and
- a sixth torque transmitting device selectively engageable to connect the second rotary member with the stationary member, and
- wherein the torque transmitting devices are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
8 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 sun gears of the first and second planetary gear sets and the ring gear of the third planetary gear set are connected to form a first rotary member, the carrier member of the third planetary gear set and the ring gear of the fourth planetary gear set are connected to form a second rotary member, the carrier members of the second and fourth planetary gear sets and the input member are connected to form a third rotary member, and the ring gear of the first planetary gear set is continuously connected with a stationary member;
- a first torque transmitting device selectively engageable to connect the ring gear of the second planetary gear set with the output member;
- a second torque transmitting device selectively engageable to connect the carrier member of the first planetary gear set with the output member;
- a third torque transmitting device selectively engageable to connect the sun gear of the third planetary gear set with the sun gear of the fourth planetary gear set;
- a fourth torque transmitting device selectively engageable to connect the sun gear of the third planetary gear set with the second rotary member;
- a fifth torque transmitting device selectively engageable to connect the sun gear of the fourth planetary gear set with the stationary member;
- and
- a sixth torque transmitting device selectively engageable to connect the second rotary member with the stationary member, and
- wherein the torque transmitting devices are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
8 more elements
Dependencies are inferred from the claim text.