Patent ID: 11933390
Assignee: ALLISON TRANSMISSION, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A multiple speed transmission, comprising:
an input shaft;
an output shaft;
a first planetary gearset having a sun gear, a first carrier member, and a first ring gear;
a second planetary gearset having an input member, a reaction member, a second carrier member, a second ring gear, and a third ring gear, wherein the second carrier member comprises a first gear and a second gear;
a plurality of interconnecting members each connected between at least one of the first and second planetary gearsets and at least another of the first and second planetary gearsets;
a first torque-transmitting mechanism selectively engageable to interconnect the input shaft with the sun gear of the first planetary gearset;
a second torque-transmitting mechanism selectively engageable to interconnect the input shaft with the first ring gear of the first planetary gearset and the second carrier member of the second planetary gearset;
a third torque-transmitting mechanism selectively engageable to interconnect the first ring gear of the first planetary gearset and the second carrier member of the second planetary gearset with a stationary member;
a fourth torque-transmitting mechanism selectively engageable to interconnect the second ring gear of the second planetary gearset with the stationary member;
a fifth torque-transmitting mechanism selectively engageable to interconnect the reaction member of the second planetary gearset with the stationary member;
a sixth torque-transmitting mechanism selectively engageable to interconnect the third ring gear of the second planetary gearset with the stationary member;
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two;
wherein, the selective engagement of two of the first, second, third, fourth, fifth, and sixth torque-transmitting mechanisms establishes X number of forward speed ratios and Y reverse speed ratios between the input and output shafts;
wherein, the first gear and the second gear of the second carrier member are coaxial and rotationally locked to one another, the first gear having a greater diameter than the second gear.