Multi-speed transmission having three planetary gear sets
View Patent ↗A transmission is provided having an input member, an output member, three 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 include clutches and brakes.
1. A transmission comprising:
an input member;
an output member;
first, second, and third planetary gear sets each having first, second and third members, wherein the input member is continuously directly connected to the third member of the first planetary gear set and the output member is continuously interconnected to 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 second member of the second planetary gear set and the first member of the third planetary gear set;
a second interconnecting member continuously directly connecting the second member of the first planetary gear set with the third member of the second planetary gear set; and
six torque transmitting mechanisms each selectively engageable to interconnect at least one of the first, second, and third members with at least another of the first, second, third members and a stationary element, wherein a first of the six torque transmitting mechanisms is selectively engageable to directly connect the second member of the first planetary gear set with the second member of the third planetary gear set, and
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
2. The transmission of claim 1 wherein four of the torque transmitting mechanisms are brakes each for connecting a plurality of the first, second, and third members to the stationary element and two of the torque transmitting mechanisms are clutches each for connecting a set of the first, second, and third members to another set of the first, second, and third members.
3. The transmission of claim 1 wherein the third member of the first planetary gear set and the first member of the second and third planetary gear sets are sun gears, the second members of the first, second and third planetary gear sets are carrier members, and the first member of the first planetary gear set and the third member of the second and third planetary gear sets are ring gears.
4. The transmission of claim 1 wherein a second of the six torque transmitting mechanisms is selectively engageable to interconnect the third member of the first planetary gear set with the second member of the third planetary gear set.
5. The transmission of claim 4 wherein a third of the six torque transmitting mechanisms is selectively engageable to interconnect the second member of the third planetary gear set with the stationary element.
6. The transmission of claim 5 wherein a fourth of the six torque transmitting mechanisms is selectively engageable to interconnect the second member of the second planetary gear set with the stationary element.
7. The transmission of claim 6 wherein a fifth of the six torque transmitting mechanisms is selectively engageable to interconnect at least one of the second member of the first planetary gear set and the third member of the second planetary gear set with the stationary element.
8. The transmission of claim 7 wherein a sixth of the six torque transmitting mechanisms is selectively engageable to interconnect the first member of the second planetary gear set with the stationary element.
9. A transmission comprising:
an input member;
an output member;
first, second, and third planetary gear sets each having first, second and third members, wherein the input member is continuously directly connected to the third member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;
a first interconnecting member continuously directly connecting the first member of the first planetary gear set with the second member of the second planetary gear set and the first member of the third planetary gear set;
a second interconnecting member continuously directly connecting the second member of the first planetary gear set with the third member of the second planetary gear set;
a first torque transmitting mechanism selectively engageable to directly connect the second member of the first planetary gear set with the second member of the third planetary gear set;
a second torque transmitting mechanism selectively engageable to directly connect the third member of the first planetary gear set with the second member of the third planetary gear set;
a third torque transmitting mechanism selectively engageable to directly connect the second member of the third planetary gear set with the stationary element;
a fourth torque transmitting mechanism selectively engageable to directly connect the second member of the second planetary gear set with the stationary element;
a fifth torque transmitting mechanism selectively engageable to directly connect at least one of the second member of the first planetary gear set and the third member of the second planetary gear set with the stationary element; and
a sixth torque transmitting mechanism selectively engageable to directly connect the first member of the second planetary gear set with the stationary element,
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
10. The transmission of claim 9 wherein the third member of the first planetary gear set and the first member of the second and third planetary gear sets are sun gears, the second members of the first, second and third planetary gear sets are carrier members, and the first member of the first planetary gear set and the third member of the second and third planetary gear sets are ring gears.
11. A transmission comprising:
an input member;
an output member;
first, second, and third planetary gear sets each having sun gear, carrier and ring gear members, wherein the input member is continuously directly connected to the sun gear member of the first planetary gear set and the output member is continuously directly connected to the ring gear member of the third planetary gear set;
a first interconnecting member continuously directly connecting the ring gear member of the first planetary gear set with the carrier member of the second planetary gear set and the sun gear member of the third planetary gear set;
a second interconnecting member continuously directly connecting the carrier member of the first planetary gear set with the ring gear member of the second planetary gear set;
a first torque transmitting mechanism selectively engageable to directly connect the carrier member of the first planetary gear set with the carrier member of the third planetary gear set;
a second torque transmitting mechanism selectively engageable to directly connect the sun gear member of the first planetary gear set with the carrier member of the third planetary gear set;
a third torque transmitting mechanism selectively engageable to directly connect the carrier member of the third planetary gear set with the stationary element;
a fourth torque transmitting mechanism selectively engageable to directly connect the carrier member of the second planetary gear set with the stationary element;
a fifth torque transmitting mechanism selectively engageable to directly connect at least one of the carrier member of the first planetary gear set and the ring gear member of the second planetary gear set with the stationary element; and
a sixth torque transmitting mechanism selectively engageable to directly connect the sun gear member of the second planetary gear set with the stationary element,
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.