EIGHT SPEED AUTOMATIC 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 first member of the first planetary gear set with the first member of the second planetary gear set and the second member of the third planetary gear set;
a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the third member of the second planetary gear set;
a third interconnecting member continuously interconnecting the second member of the second planetary gear set with the third member of the fourth planetary gear set; and
five torque transmitting devices selectively engageable to interconnect one of the first members, second members, and third members with at least one of the first members, second members, third members, and a stationary member; and
wherein the torque transmitting devices 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
An automatic transmission includes 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 be either clutches or brakes.
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Citations
20 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 first member of the first planetary gear set with the first member of the second planetary gear set and the second member of the third planetary gear set; a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the third member of the second planetary gear set; a third interconnecting member continuously interconnecting the second member of the second planetary gear set with the third member of the fourth planetary gear set; and five torque transmitting devices selectively engageable to interconnect one of the first members, second members, and third members with at least one of the first members, second members, third members, and a stationary member; and wherein the torque transmitting devices 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, 10, 11, 12, 13, 14)
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15. 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 fourth 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 first member of the first planetary gear set with the first member of the second planetary gear set and the second member of the third planetary gear set; a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the third member of the second planetary gear set; a third interconnecting member continuously interconnecting the second member of the second planetary gear set with the third member of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect at least one of the second member of the fourth planetary gear set and the input member with at least one of the first member of the second planetary gear set, the first member of the first planetary gear set, and the second member of the third planetary gear set; a second torque transmitting device selectively engageable to interconnect at least one of the third member of the second planetary gear set and the second member of the first planetary gear set with at least one of the third member of the third planetary gear set and the output member; a third torque transmitting device selectively engageable to interconnect the first member of the fourth planetary gear set with the first member of the third planetary gear set; a fourth torque transmitting device selectively engageable to interconnect the third member of the first planetary gear with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the first member of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices 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 (16)
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17. 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 fourth 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 first member of the first planetary gear set with the first member of the second planetary gear set and the second member of the third planetary gear set; a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the third member of the second planetary gear set; a third interconnecting member continuously interconnecting the second member of the second planetary gear set with the third member of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect at least one of the second member of the fourth planetary gear set and the input member with at least one of the first member of the second planetary gear set, the first member of the first planetary gear set, and the second member of the third planetary gear set; a second torque transmitting device selectively engageable to interconnect the first member of the fourth planetary gear set with the first member of the third planetary gear set; a third torque transmitting device selectively engageable to interconnect at least one of the third member of the second planetary gear set and the second member of the first planetary gear set with the first member of the third planetary gear set; a fourth torque transmitting device selectively engageable to interconnect the third member of the first planetary gear with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the first member of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices 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 (18)
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19. 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 fourth planetary gear set and the output member is continuously interconnected with the ring gear of the third planetary gear set; a first interconnecting member continuously interconnecting the sun gear of the first planetary gear set with the sun gear of the second planetary gear set and the carrier member of the third planetary gear set; a second interconnecting member continuously interconnecting the carrier member of the first planetary gear set with the ring gear of the second planetary gear set; a third interconnecting member continuously interconnecting the carrier member of the second planetary gear set with the ring gear of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect at least one of the carrier member of the fourth planetary gear set and the input member with at least one of the sun gear of the second planetary gear set, the sun gear of the first planetary gear set, and the carrier member of the third planetary gear set; a second torque transmitting device selectively engageable to interconnect at least one of the ring gear of the second planetary gear set and the carrier member of the first planetary gear set with at least one of the ring gear of the third planetary gear set and the output member; a third torque transmitting device selectively engageable to interconnect the sun gear of the fourth planetary gear set with the sun gear of the third planetary gear set; a fourth torque transmitting device selectively engageable to interconnect the ring gear of the first planetary gear with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the sun gear of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices 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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20. 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 fourth planetary gear set and the output member is continuously interconnected with the carrier member of the third planetary gear set; a first interconnecting member continuously interconnecting the carrier member of the first planetary gear set with the ring gear of the second planetary gear set and the sun gear of the third planetary gear set; a second interconnecting member continuously interconnecting the ring gear of the first planetary gear set with the carrier member of the second planetary gear set; a third interconnecting member continuously interconnecting the sun gear of the second planetary gear set with the sun gear of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect at least one of the carrier member of the fourth planetary gear set and the input member with at least one of the ring gear of the second planetary gear set, the carrier member of the first planetary gear set, and the sun gear of the third planetary gear set; a second torque transmitting device selectively engageable to interconnect the ring gear of the fourth planetary gear set with the ring gear of the third planetary gear set; a third torque transmitting device selectively engageable to interconnect at least one of the carrier member of the second planetary gear set and the ring gear of the first planetary gear set with the ring gear of the third planetary gear set; a fourth torque transmitting device selectively engageable to interconnect the sun gear of the first planetary gear with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the ring gear of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices 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