# US 10,480,623 B2 · Automatic transmission for a vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,623 B2 - Document ID: US10480623B2 - Status: Granted - Kind: B2 - Application number: 15/487,007 - Filed: 2017-04-13 - Published: 2018-10-18 - Granted: 2019-11-19 - Earliest claimed: 2017-04-13 - Assignees: Fca US LLC - Applicants: William Mayhew - Inventors: William Mayhew - Web page: https://patentgrep.com/patent/US10480623B2 ## CPC - F16H 3/66: composed of a number of gear trains without drive passing from one train to another - F16H 2003/442: {comprising two or more sets of orbital gears arranged in a single plane} - F16H 2003/445: {without permanent connection between the input and the set of orbital gears} - F16H 2200/0065: the gear ratios comprising nine forward speeds - F16H 2200/2012: with four sets of orbital gears - F16H 2200/2046: with six engaging means - F16H 2200/2064: using at least one positive clutch, e.g. dog clutch - F16H 2200/2066: using one freewheel mechanism - F16H 2200/2082: one freewheel mechanisms - F16H 2200/2094: using positive clutches, e.g. dog clutches - F16H: GEARING ## Abstract A multi-speed automatic transmission includes a housing, a transmission input shaft, and a plurality of clutches. Different combinations of a predetermined number of clutches of the plurality of clutches generate respective different gear ratios corresponding to respective forward or rearward speeds of the automatic transmission. The plurality of clutches includes a first clutch comprising a multi-plate clutch portion and a selectable one way clutch portion. The selectable one way clutch is utilized for generating one forward speed and one rearward speed of the automatic transmission. ## Claims ### Claim 1 A multi-speed automatic transmission comprising: a housing; a transmission input shaft; and a plurality of clutches, wherein different combinations of a predetermined number of clutches of the plurality of clutches generate respective different gear ratios corresponding to respective forward or rearward speeds of the automatic transmission, the plurality of clutches including: a first clutch comprising a multi-plate clutch portion and a selectable one way clutch portion, wherein the selectable one way clutch is engaged for selectively generating one forward speed and one rearward speed of the automatic transmission, wherein the selectable one way clutch portion is movable between a forward torque holding mode configured to transfer torque in a first rotational direction but not in an opposite second rotational direction, and a rearward torque holding mode configured to transfer torque in the second rotational direction but not in the first rotational direction, and wherein the selectable one way clutch portion is operated in the forward torque holding mode in nine forward speeds of the automatic transmission, the selectable one way clutch portion is operated in the rearward torque holding mode in the one rearward speed of the automatic transmission, and the multi-plate clutch portion is selectively engaged to transfer torque in three of the nine forward speeds, wherein the nine forward speeds includes the one forward speed. ### Claim 2 (depends on 1) The automatic transmission of claim 1, wherein the selectable one way clutch portion includes an input driving member coupled to a ring gear and an output driven member coupled to the transmission housing. ### Claim 3 (depends on 1) The automatic transmission of claim 1, further comprising a controller configured to move the multi-plate clutch portion between an engaged state and a disengaged state. ### Claim 4 (depends on 1) The automatic transmission of claim 1, wherein the multi-plate clutch portion includes a retainer and a clutch pack. ### Claim 5 (depends on 4) The automatic transmission of claim 4, wherein the retainer is grounded to the housing and the clutch pack includes alternating first and second friction discs. ### Claim 6 (depends on 5) The automatic transmission of claim 5, wherein the first friction discs are coupled to a ring gear and configured to rotate therewith, and the second friction discs are grounded to the transmission housing through the retainer. ### Claim 7 (depends on 6) The automatic transmission of claim 6, wherein the first friction discs comprise only two first friction discs. ### Claim 8 A nine-speed automatic transmission comprising: a housing; a transmission input shaft; a first clutch coupled to the transmission input shaft; a second clutch; a third clutch; a fourth clutch comprising a multi-plate clutch portion and a selectable one way clutch portion, wherein the selectable one way clutch portion is engaged to selectively generate one forward speed and one rearward speed of the automatic transmission; a fifth clutch; and a sixth clutch, wherein the selectable one way clutch portion is movable between a forward torque holding mode configured to transfer torque in a first rotational direction but not in an opposite second rotational direction, and a rearward torque holding mode configured to transfer torque in the second rotational direction but not in the first rotational direction, wherein the selectable one way clutch portion is operated in the forward torque holding mode in nine forward speeds of the automatic transmission, the selectable one way clutch portion is operated in the rearward torque holding mode in the one rearward speed of the automatic transmission, and the multi-plate clutch portion is engaged to selectively transfer torque in three of the nine forward speeds, wherein the nine forward speeds includes the one forward speed. ### Claim 9 (depends on 8) The automatic transmission of claim 8, wherein the selectable one way clutch portion transfers torque in one of the nine forward speeds and overruns in eight of the nine forward speeds. ### Claim 10 (depends on 9) The automatic transmission of claim 9, wherein the selectable one way clutch portion transfers torque in a first gear and the one rearward speed of the automatic transmission, and the multi-plate clutch portion transfers torque in a seventh, eighth, and ninth gear of the automatic transmission. ### Claim 11 A multi-speed automatic transmission comprising: a housing; a transmission input shaft; and a plurality of clutches, wherein different combinations of a predetermined number of clutches of the plurality of clutches generate respective different gear ratios corresponding to respective forward or rearward speeds of the automatic transmission, the plurality of clutches including: a first clutch comprising a multi-plate clutch portion and a selectable one way clutch portion, wherein the selectable one way clutch is engaged for selectively generating one forward speed and one rearward speed of the automatic transmission, wherein the multi-plate clutch portion includes a retainer and a clutch pack, wherein the retainer is grounded to the housing and the clutch pack includes alternating first and second friction discs, and wherein the first friction discs are coupled to a ring gear and configured to rotate therewith, and the second friction discs are grounded to the transmission housing through the retainer.