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 rotary member formed by interconnecting the third member of the first planetary gear set with the second member of the third planetary gear set;
a second rotary member formed by interconnecting the first member of the second planetary gear set with the first member of the third planetary gear set;
a third rotary member formed by interconnecting the third member of the third planetary gear set with the first member of the fourth planetary gear set; and
five torque transmitting devices each selectively engageable to interconnect one of the first members, second members, third members, first rotary member, second rotary member, and third rotary member with at least one of another of the first members, second members, third members, first rotary member, second rotary member, third rotary member, and a stationary member, andwherein the torque transmitting devices are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, andwherein at least two torque transmitting devices are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio.
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Abstract
An automatic 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 be either clutches or brakes.
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Citations
30 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 rotary member formed by interconnecting the third member of the first planetary gear set with the second member of the third planetary gear set; a second rotary member formed by interconnecting the first member of the second planetary gear set with the first member of the third planetary gear set; a third rotary member formed by interconnecting the third member of the third planetary gear set with the first member of the fourth planetary gear set; and five torque transmitting devices each selectively engageable to interconnect one of the first members, second members, third members, first rotary member, second rotary member, and third rotary member with at least one of another of the first members, second members, third members, first rotary member, second rotary member, third rotary member, and a stationary member, and wherein the torque transmitting devices are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and wherein at least two torque transmitting devices are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. 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 first member of the first planetary gear set and the second member of the second planetary gear set and the output member is continuously interconnected with the second member of the fourth planetary gear set; at least three rotary members formed by interconnecting at least one of the first, second, third, and fourth members with another of the first, second, third, and fourth members; a first torque transmitting device selectively engageable to interconnect at least one of the first member of the second planetary gear set and the first member of the third planetary gear set with the second member of the first planetary gear set; a second torque transmitting device selectively engageable to interconnect the third member of the second planetary gear set with at least one of the second member of the fourth planetary gear set and the output member; a third torque transmitting device selectively engageable to interconnect at least one of the first member of the third planetary gear set and the first member of the second planetary gear set with at least one of the third member of the third planetary gear set and the first member of the fourth planetary gear set; a fourth torque transmitting device selectively engageable to interconnect the second member of the first planetary gear with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the third member of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and wherein at least two torque transmitting devices are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio. - View Dependent Claims (23, 24)
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25. 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 first member of the first planetary gear set and the second member of the second planetary gear set and the output member is continuously interconnected with the second member of the fourth planetary gear set; at least three rotary members formed by interconnecting at least one of the first, second, third, and fourth members with another of the first, second, third, and fourth members; a first torque transmitting device selectively engageable to interconnect the second member of the first planetary gear set with the third member of the second planetary gear set; a second torque transmitting device selectively engageable to interconnect at least one of the first member of the second planetary gear set and the first member of the third planetary gear set with the second member of the first planetary gear set; a third torque transmitting device selectively engageable to interconnect at least one of the second member of the fourth planetary gear set and the output member with the third member of the second planetary gear set; a fourth torque transmitting device selectively engageable to interconnect at least one of the third member of the first planetary gear set and the second member of the third planetary gear set with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the third member of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and wherein at least two torque transmitting devices are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio. - View Dependent Claims (26, 27)
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28. 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 first member of the first planetary gear set and the second member of the second planetary gear set and the output member is continuously interconnected with the second member of the fourth planetary gear set; at least three rotary members formed by interconnecting at least one of the first, second, third, and fourth members with another of the first, second, third, and fourth members; a first torque transmitting device selectively engageable to interconnect the third member of the second planetary gear set with at least one of the second member of the third planetary gear set and the third member of the first planetary gear set; a second torque transmitting device selectively engageable to interconnect the third member of the second planetary gear set with the second member of the first planetary gear set; a third torque transmitting device selectively engageable to interconnect at least one of the second member of the fourth planetary gear set and the output member with the second member of the first planetary gear set; a fourth torque transmitting device selectively engageable to interconnect at least one of the first member of the second planetary gear set and the first member of the third planetary gear set with a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the third member of the fourth planetary gear set with the stationary member, and wherein the torque transmitting devices are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and wherein at least two torque transmitting devices are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio. - View Dependent Claims (29, 30)
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Specification