MULTI-SPEED TRANSMISSION
First Claim
Patent Images
1. 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 mechanism selectively engageable to interconnect at least one of the second member of the second planetary gear set and the first member of the first planetary gear set with the third member of the fourth planetary gear set;
a second torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set with the second member of the fourth planetary gear set;
a third torque transmitting mechanism selectively engageable to interconnect at least one of the first member of the third planetary gear set and the first member of the fourth planetary gear set with the third member of the fourth planetary gear set;
a fourth torque transmitting mechanism selectively engageable to interconnect at least one of the second member of the third planetary gear set and the output member with the third member of the fourth planetary gear set; and
a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gear set with a stationary member, andwherein 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.
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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. 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.
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Citations
24 Claims
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1. A transmission comprising:
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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 mechanism selectively engageable to interconnect at least one of the second member of the second planetary gear set and the first member of the first planetary gear set with the third member of the fourth planetary gear set; a second torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set with the second member of the fourth planetary gear set; a third torque transmitting mechanism selectively engageable to interconnect at least one of the first member of the third planetary gear set and the first member of the fourth planetary gear set with the third member of the fourth planetary gear set; a fourth torque transmitting mechanism selectively engageable to interconnect at least one of the second member of the third planetary gear set and the output member with the third member of the fourth planetary gear set; and a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gear set with 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A transmission comprising:
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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 interconnected with the sun gear of the first planetary gear set and wherein the output member is continuously interconnected with the carrier member of the third planetary gear set; at least four continuous interconnections from at least one of the sun gears, carrier members, and ring gears to at least one other of the sun gears, carrier members, ring gears, and a stationary member; a first torque transmitting mechanism selectively engageable to interconnect at least one of the carrier member of the second planetary gear set and the sun gear of the first planetary gear set with the ring gear of the fourth planetary gear set; a second torque transmitting mechanism selectively engageable to interconnect the ring gear of the second planetary gear set with the carrier member of the fourth planetary gear set; a third torque transmitting mechanism selectively engageable to interconnect at least one of the sun gear of the third planetary gear set and the sun gear of the fourth planetary gear set with the ring gear of the fourth planetary gear set; a fourth torque transmitting mechanism selectively engageable to interconnect at least one of the carrier member of the third planetary gear set and the output member with the ring gear of the fourth planetary gear set; and a fifth torque transmitting mechanism selectively engageable to interconnect the carrier member of the fourth planetary gear set with the stationary element, 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification