Multi-speed transmission
View Patent ↗A transmission has an input member, an output member, at least 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 include clutches and brakes actuatable in combinations of three to establish a plurality of forward gear ratios and at least one reverse gear ratio.
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, and wherein the input member is continuously connected for common rotation with the first member of the first planetary gear set;
a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the first member of the third planetary gear set;
a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the second member of the second planetary gear set;
a third interconnecting member continuously interconnecting the first member of the second planetary gear set with the second member of the third planetary gear set and the third member of the fourth planetary gear set; and
seven torque transmitting mechanisms each selectively engageable to interconnect at least one of the first, second, and third members of one of the first, second, third and fourth planetary gear sets with at least one other of the first, second, third members of one of the first, second, third and fourth planetary gear sets and a stationary member, and
wherein the seven torque transmitting mechanisms are selectively engageable in combinations of at least three to establish a plurality of 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 a first of the seven torque transmitting mechanisms is selectively engageable to interconnect the first member of the first planetary gear set and the input member with the second member of the fourth planetary gear set.
3. The transmission of claim 2 wherein a second of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the first planetary gear set and the first member of the third planetary gear set with the second member of the fourth planetary gear set.
4. The transmission of claim 3 wherein a third of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the first planetary gear set and the second member of the second planetary gear set with the third member of the second planetary gear set.
5. The transmission of claim 4 wherein a fourth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the fourth planetary gear set with the stationary member.
6. The transmission of claim 5 wherein a fifth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the first planetary gear set and the first member of the third planetary gear set with the stationary member.
7. The transmission of claim 6 wherein a sixth of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the third planetary gear set with the stationary member.
8. The transmission of claim 7 wherein a seventh of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the second planetary gear set with the stationary member.
9. The transmission of claim 1 wherein the output member is continuously connected for common rotation with the first member of the fourth planetary gear set.
10. The transmission of claim 3 wherein a third of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the second planetary gear set with the first member of the second planetary gear set, the second member of the third planetary gear set and the third member of the fourth planetary gear set.
11. The transmission of claim 10 wherein a fourth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the fourth planetary gear set with the stationary member.
12. The transmission of claim 11 wherein a fifth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the first planetary gear set and the first member of the third planetary gear set with the stationary member.
13. The transmission of claim 12 wherein a sixth of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the third planetary gear set with the stationary member.
14. The transmission of claim 13 wherein a seventh of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the second planetary gear set with the stationary member.
15. The transmission of claim 3 wherein a third of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the first planetary gear set and the second member of the second planetary gear set with the first member of the second planetary gear set, the second member of the third planetary gear set and the third member of the fourth planetary gear set.
16. The transmission of claim 15 wherein a fourth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the fourth planetary gear set with the stationary member.
17. The transmission of claim 16 wherein a fifth of the seven torque transmitting mechanisms is selectively engageable to interconnect the second member of the first planetary gear set and the first member of the third planetary gear set with the stationary member.
18. The transmission of claim 17 wherein a sixth of the seven torque transmitting mechanisms is selectively engageable to interconnect the third member of the third planetary gear set with the stationary member.