# US 8,771,131 B2 · Transmission device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,131 B2 - Document ID: US8771131B2 - Status: Granted - Kind: B2 - Application number: 13/446,439 - Filed: 2012-04-13 - Published: 2012-10-18 - Granted: 2014-07-08 - Earliest claimed: 2011-04-15 - Assignees: Aisin Aw Co., Ltd. - Applicants: Tomohide Suzuki; Tsuyoshi Fukaya - Inventors: Tomohide Suzuki; Tsuyoshi Fukaya - Web page: https://patentgrep.com/patent/US8771131B2 ## CPC - F16H 3/66: composed of a number of gear trains without drive passing from one train to another - F16H 2200/0052: the gear ratios comprising six forward speeds - F16H 2200/201: with three sets of orbital gears - F16H 2200/2043: with five engaging means - F16H 2200/2082: one freewheel mechanisms - F16H: GEARING ## Abstract A transmission device capable of transmitting power applied to an input shaft to an output shaft while changing a speed ratio to a plurality of stages, including a single-pinion type first planetary gear mechanism, a single-pinion type second planetary gear mechanism a third planetary gear mechanism; first clutch and second clutches; and first and second brakes. The first planetary gear mechanism is disposed more toward the input shaft side than the second planetary gear mechanism, and the second planetary gear mechanism is disposed more toward the input shaft side than the third planetary gear mechanism, and the first brake is disposed circumferentially outward of the second planetary gear mechanism so as to at least partially overlap with the second planetary gear mechanism, and the second brake is disposed circumferentially outward of the first planetary gear mechanism so as to at least partially overlap with the first planetary gear mechanism. ## Claims ### Claim 1 A transmission device capable of transmitting power applied to an input shaft to an output shaft while changing a speed ratio to a plurality of stages, the transmission device comprising: a single-pinion type first planetary gear mechanism including a first sun gear that is coupled to the input shaft, a first carrier that rotatably supports a first pinion gear that meshes with the first sun gear, and a first ring gear that meshes with the first pinion gear; a single-pinion type second planetary gear mechanism including a second sun gear, a second carrier that rotatably supports a second pinion gear that meshes with the second sun gear, and a second ring gear that is coupled to the first carrier and meshes with the second pinion gear; a third planetary gear mechanism including a rotation element that is coupled to the second sun gear, and a rotation element that is coupled to the output shaft; a case that accommodates the first, second, and third planetary gear mechanisms; a first clutch capable of coupling and uncoupling the input shaft and the second sun gear; a second clutch capable of coupling and uncoupling the input shaft and the second carrier; a first brake that is engaged when forming a first shift speed, and capable of holding the first ring gear stationary to the case; and a second brake that is engaged when forming a second shift speed that is a lower speed than the first shift speed, and capable of holding the second ring gear stationary to the case, wherein the first planetary gear mechanism is disposed more toward the input shaft side than the second planetary gear mechanism, and the second planetary gear mechanism is disposed more toward the input shaft side than the third planetary gear mechanism, and the first brake is disposed circumferentially outward of the second planetary gear mechanism so as to at least partially overlap with the second planetary gear mechanism as viewed from a radial direction, and the second brake is disposed circumferentially outward of the first planetary gear mechanism so as to at least partially overlap with the first planetary gear mechanism as viewed from the radial direction. ### Claim 2 (depends on 1) The transmission device according to claim 1, wherein the first carrier and the second ring gear are coupled to each other through a fitted portion without an aligning function. ### Claim 3 (depends on 2) The transmission device according to claim 2, wherein the first carrier and the second ring gear are coupled through a coupling member that includes an outer circumferential portion fitted to an inner circumferential portion of the second ring gear, and an inner circumferential portion fitted to the first carrier, and the coupling member is fitted with at least radial play to at least one of the second ring gear and the first carrier. ### Claim 4 (depends on 3) The transmission device according to claim 3, wherein the first carrier includes a ring-like radially-extending portion that rotatably supports the first pinion gear, and an axially-extending portion that axially extends from an inner circumferential portion of the radially-extending portion toward the second planetary gear mechanism, the coupling member is fitted to the axially-extending portion of the first carrier, and the first ring gear is fixed to a ring-like flange member that is rotatably supported by the axially-extending portion between the radially-extending portion of the first carrier and the coupling member. ### Claim 5 (depends on 4) The transmission device according to claim 4, wherein a first brake hub that configures the first brake is fixed to the flange member at a position that overlaps with the axially-extending portion of the first carrier as viewed from the radial direction. ### Claim 6 (depends on 5) The transmission device according to claim 5, wherein an inner circumferential portion of the flange member is axially offset toward the coupling member, and a thrust bearing is disposed on both axial sides of the inner circumferential portion of the flange member. ### Claim 7 (depends on 6) The transmission device according to claim 6, wherein the third planetary gear mechanism is a single-pinion type planetary gear mechanism including a third sun gear that is coupled to the second sun gear, a third carrier that is coupled to the output shaft and rotatably supports a third pinion gear that meshes with the third sun gear, and a third ring gear that is coupled to the second carrier and meshes with the third pinion gear, and the transmission device further includes a third brake capable of holding the third ring gear stationary to the case. ### Claim 8 (depends on 4) The transmission device according to claim 4, wherein an inner circumferential portion of the flange member is axially offset toward the coupling member, and a thrust bearing is disposed on both axial sides of the inner circumferential portion of the flange member. ### Claim 9 (depends on 1) The transmission device according to claim 1, wherein the third planetary gear mechanism is a single-pinion type planetary gear mechanism including a third sun gear that is coupled to the second sun gear, a third carrier that is coupled to the output shaft and rotatably supports a third pinion gear that meshes with the third sun gear, and a third ring gear that is coupled to the second carrier and meshes with the third pinion gear, and the transmission device further includes a third brake capable of holding the third ring gear stationary to the case.