# US 2021/0277979 A1 · Multi-speed transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277979 A1 - Document ID: US20210277979A1 - Status: Published application - Kind: A1 - Application number: 17/328,155 - Filed: 2021-05-24 - Published: 2021-09-09 - Earliest claimed: 2019-11-27 - Assignees: Allison Transmission, Inc. - Applicants: Allison Transmission, Inc. - Inventors: Rayman E. Bazilio - Web page: https://patentgrep.com/patent/US20210277979A1 ## CPC - F16H 3/62: Gearings having three or more central gears (F16H3/68 - F16H3/78 take precedence) - F16H 3/66: composed of a number of gear trains without drive passing from one train to another - F16H 2200/0069: the gear ratios comprising ten forward speeds - F16H 2200/0078: the gear ratio comprising twelve or more forward speeds - F16H 2200/0091: the gear ratios comprising three reverse speeds - F16H 2200/2012: with four sets of orbital gears - F16H 2200/2048: with seven engaging means - F16H 2200/2051: with eight engaging means - F16H: GEARING ## Abstract A multiple speed transmission includes an input member, an output member, first, second, third and fourth planetary gearsets each having first, second and third members, and a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets. The transmission includes a plurality of torque-transmitting mechanisms between the input and output members, wherein the torque transmitting mechanisms are selectively engageable in combinations of at least four to establish at least ten forward speed ratios between the input member and the output member. ## Claims ### Claim 1 A multiple speed transmission, comprising: an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the first member of the first planetary gearset and the first member of the second planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the third planetary gearset; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the second planetary gearset and the third member of the first planetary gearset with the first member of the third planetary gearset; a fourth torque-transmitting mechanism selectively engageable to interconnect the first member of the third planetary gearset with the second member of the third planetary gearset and the first member of the fourth planetary gearset; a fifth torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the stationary member; a seventh torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset and the first member of the fourth planetary gearset to the second member of the fourth planetary gearset; and an eighth torque-transmission 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; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least four to establish at least ten forward speed ratios and at least one reverse speed ratio between the input member and the output member. ### Claim 2 (depends on 1) The multiple speed transmission of claim 1, wherein the input member and the output member are axially aligned with one another. ### Claim 3 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the first member of the first planetary gearset with the first member of the second planetary gearset. ### Claim 4 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a second interconnecting member directly connected to the second member of the first planetary gearset. ### Claim 5 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a third interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset. ### Claim 6 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a fourth interconnecting member directly connected to the first member of the third planetary gearset. ### Claim 7 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a fifth interconnecting member continuously interconnecting the second member of the third planetary gearset to the first member of the fourth planetary gearset. ### Claim 8 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a sixth interconnecting member directly connected to the third member of the third planetary gearset. ### Claim 9 (depends on 1) The multiple speed transmission of claim 1, wherein the plurality of interconnecting members includes a seventh interconnecting member directly connected to the third member of the fourth planetary gearset. ### Claim 10 A multiple speed transmission, comprising: an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the first member of the first planetary gearset and the first member of the second planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a first gear, where the first gear and the input are disposed along a first axis; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the second planetary gearset and the third member of the first planetary gearset with the first gear; a fourth torque-transmitting mechanism selectively engageable to interconnect the first member of the third planetary gearset and a second gear with the second member of the third planetary gearset and the first member of the fourth planetary gearset, where the second gear and the output are disposed along a second axis; a fifth torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the stationary member; and a seventh torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset and the first member of the fourth planetary gearset to the second member of the fourth planetary gearset; wherein, the first axis and second axis are parallel to but offset from one another; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least four to establish at least ten forward speed ratios and at least one reverse speed ratio between the input member and the output member. ### Claim 11 (depends on 11) The multiple speed transmission of claim 11, further comprising a third gear coupled between the first and second gears for transferring torque between the first axis and the second axis. ### Claim 12 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the first member of the first planetary gearset with the first member of the second planetary gearset. ### Claim 13 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a second interconnecting member directly connected to the second member of the first planetary gearset. ### Claim 14 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a third interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset. ### Claim 15 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a fourth interconnecting member directly connected to the first gear. ### Claim 16 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a fifth interconnecting member directly connected to the first member of the third planetary gearset. ### Claim 17 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a sixth interconnecting member continuously interconnecting the second member of the third planetary gearset to the first member of the fourth planetary gearset. ### Claim 18 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes a seventh interconnecting member directly connected to the third member of the third planetary gearset. ### Claim 19 (depends on 10) The multiple speed transmission of claim 10, wherein the plurality of interconnecting members includes an eighth interconnecting member directly connected to the third member of the fourth planetary gearset. ### Claim 20 A multiple speed transmission, comprising: an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the first member of the first planetary gearset and the first member of the second planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a first gear, the first gear and the input member being disposed along a first axis; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the second planetary gearset and the third member of the first planetary gearset with the first gear; a fourth torque-transmitting mechanism selectively engageable to interconnect the first member of the third planetary gearset and a second gear with the second member of the third planetary gearset and the first member of the fourth planetary gearset, the second gear and the output being disposed along a second axis; a fifth torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the stationary member; a seventh torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset and the first member of the fourth planetary gearset to the second member of the fourth planetary gearset; and an eighth torque-transmission 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; wherein, the first axis and second axis are parallel to but offset from one another; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least four to establish at least ten forward speed ratios and at least one reverse speed ratio between the input member and the output member.