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US 10,948,052 B2Granted
Transmission range adder
AssigneeAllison Transmission, Inc.
InventorEdmond M. Etchason
Life of this patent
Estimating the term…
Abstract
A multiple speed transmission includes an input shaft, an output shaft, a first planetary gearset having a first member, a second member, and a third member, and a second planetary gearset having a first member, a reaction member, a second member, a third member, and fourth member. The transmission also includes 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. The transmission includes a plurality of torque-transmitting mechanisms which are selectively engageable in combinations of at least two to establish a plurality of forward speed ratios and a plurality of reverse speed ratios between the input shaft and the output shaft.
Claims20
A multiple speed transmission, comprising:
- an input shaft;
- an output shaft;
- a first planetary gearset having a first member, a second member, and a third member;
- a second planetary gearset having a first member, a reaction member, a second member, a third member, and a fourth member;
- 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 first member of the first planetary gearset;
- a second torque-transmitting mechanism selectively engageable to interconnect the input shaft with the third member of the first planetary gearset and the second member of the second planetary gearset;
- a third torque-transmitting mechanism selectively engageable to interconnect the third member of the first planetary gearset and the second member of the second planetary gearset with a stationary member;
- a fourth torque-transmitting mechanism selectively engageable to interconnect the third member of the second planetary gearset with the stationary member;
- a fifth torque-transmitting mechanism selectively engageable to interconnect the fourth member of the second planetary gearset with the stationary member;
- a sixth torque-transmitting mechanism selectively engageable to interconnect the reaction member 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, and third torque-transmitting mechanisms establishes X number of forward speed ratios and Y reverse speed ratios between the input and output shafts;
- further wherein, the selective engagement of one of the first and second torque-transmitting mechanisms and one of the fourth, fifth and sixth torque-transmitting mechanisms adds five additional forward speed ratios to X number of forward speed ratios and adds four reverse speed ratios to Y number of reverse speed ratios between the input shaft and the output shaft.
11 more elements
A multiple speed transmission, comprising:
- an input shaft;
- an output shaft;
- a first planetary gearset having a sun gear, a carrier member, and a ring gear;
- a second planetary gearset having a sun gear, a reaction member, a carrier member, a first ring gear, and a second ring 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 ring gear of the first planetary gearset and the carrier member of the second planetary gearset;
- a third torque-transmitting mechanism selectively engageable to interconnect the ring gear of the first planetary gearset and the carrier member of the second planetary gearset with a stationary member;
- a fourth torque-transmitting mechanism selectively engageable to interconnect the first ring gear of the second planetary gearset with the stationary member;
- a fifth torque-transmitting mechanism selectively engageable to interconnect the second ring gear of the second planetary gearset with the stationary member;
- a sixth torque-transmitting mechanism selectively engageable to interconnect the reaction member 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, and third torque-transmitting mechanisms establishes X number of forward speed ratios and Y reverse speed ratios between the input and output shafts;
- further wherein, the selective engagement of one of the first and second torque-transmitting mechanisms and one of the fourth, fifth and sixth torque-transmitting mechanisms adds five additional forward speed ratios to X number of forward speed ratios and adds four reverse speed ratios to Y number of reverse speed ratios between the input shaft and the output shaft.
11 more elements
Dependencies are inferred from the claim text.