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 interconnecting member continuously interconnecting the third member of the first planetary gear set with a stationary member;
a second interconnecting member continuously interconnecting the first member of the second planetary gear set with the stationary member;
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 third member of the third planetary gear set with a third member of the fourth planetary gear set; and
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.
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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.
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Citations
13 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 interconnecting member continuously interconnecting the third member of the first planetary gear set with a stationary member; a second interconnecting member continuously interconnecting the first member of the second planetary gear set with the stationary member; 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 third member of the third planetary gear set with a third member of the fourth planetary gear set; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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, wherein the input member is continuously interconnected with the second member of the second planetary gear set, and the output member is continuously interconnected with the second member of the first planetary gear set; a first interconnecting member continuously interconnecting the third member of the first planetary gear set with a transmission housing; a second interconnecting member continuously interconnecting the first member of the second planetary gear set with the transmission housing; 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 third member of the third planetary gear set with a third member of the fourth planetary gear set; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the second planetary gear set with the second member of the fourth planetary gear set; a second torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with the second member of the fourth planetary gear set; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gear set with the second member of the third planetary gear set; a fourth torque-transmitting mechanism selectively engageable to interconnect the first member of the fourth planetary gear set with the third member of the third planetary gear set; a fifth torque-transmitting mechanism selectively engageable to interconnect the first member of the first planetary gear set with the first member of the fourth planetary gear set; 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. - View Dependent Claims (11, 12)
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13. 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 carrier member of the second planetary gear set, and the output member is continuously interconnected with the carrier member of the first planetary gear set; a first interconnecting member continuously interconnecting the ring gear of the first planetary gear set with the stationary member; a second interconnecting member continuously interconnecting the sun gear of the second planetary gear set with the stationary member; 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 ring gear of the third planetary gear set with ring gear of the fourth planetary gear set; a first torque-transmitting mechanism selectively engageable to interconnect the input member and the carrier member of the second planetary gear set with the carrier member of the fourth planetary gear set; a second torque-transmitting mechanism selectively engageable to interconnect the carrier member of the third planetary gear set with carrier member of the fourth planetary gear set; a third torque-transmitting mechanism selectively engageable to interconnect the carrier member of the third planetary gear set with the carrier member of the first planetary gear set; a fourth torque-transmitting mechanism selectively engageable to interconnect the sun gear of the fourth planetary gear set with the ring gear of the third planetary gear set; a fifth torque-transmitting mechanism selectively engageable to interconnect the sun gear of the first planetary gear set with sun gear of the fourth planetary gear set; 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.
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Specification