# US 8,784,257 B2 · Continuously variable transmission and a working machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,257 B2 - Document ID: US8784257B2 - Status: Granted - Kind: B2 - Application number: 13/643,092 - Filed: 2010-05-06 - Published: 2013-05-30 - Granted: 2014-07-22 - Earliest claimed: 2010-05-06 - Assignees: Volvo Construction Equipment AB - Applicants: Per Mattsson; Mats Åkerblom - Inventors: Per Mattsson; Mats Åkerblom - Web page: https://patentgrep.com/patent/US8784257B2 ## CPC - F16H 3/46: Gearings having only two central gears, connected by orbital gears (F16H3/68 - F16H3/78 take precedence) - E02F 9/2253: {Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission} - F16H 3/72: with a secondary drive, e.g. regulating motor, in order to vary speed continuously - F16H 3/725: {with means to change ratio in the mechanical gearing} - F16H 47/04: the mechanical gearing being of the type with members having orbital motion - F16H 2037/0886: {with switching means, e.g. to change ranges} - F16H 2200/2005: with one sets of orbital gears - F16H 2200/2023: using a Ravigneaux set with 4 connections - F16H: GEARING - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) ## Abstract A continuously variable transmission has an input shaft and an output shaft. The transmission includes a variator unit having an input shaft and an output shaft, and a planetary gear wheel unit having a planet carrier, a first sun wheel and a second sun wheel. The input shaft of the transmission is rotationally connectable to the planet carrier and to the input shaft of the variator unit, and a shaft rotationally fixed to the first sun wheel is rotationally connectable to the output shaft of the variator unit. The planet carrier is provided with a first inner set of planet wheels for meshing engagement with the first sun wheel and a second outer set of planet wheels for meshing engagement with the second sun wheel. The first and second sets of planet wheels are in meshing engagement with each other, and a shaft rotationally fixed to the second sun wheel is rotationally connectable to the output shaft of the transmission via a first output member for obtaining a powersplit mode in which power is transmitted via the second sun wheel. ## Claims ### Claim 1 A continuously variable transmission having an input shaft and an output shaft, comprising a variator unit having an input shaft and an output shaft, and a planetary gear wheel unit having a planet carrier, a first sun wheel and a second sun wheel, the input shaft of the transmission being rotationally connectable to the planet carrier and to the input shaft of the variator unit, a shaft rotationally fixed to the first sun wheel being rotationally connectable to the output shaft of the variator unit, wherein the planet carrier is provided with a first inner set of planet wheels for meshing engagement with the first sun wheel and a second outer set of planet wheels for meshing engagement with the second sun wheel, the first and second sets of planet wheels being in meshing engagement with each other, and a shaft rotationally fixed to the second sun wheel is rotationally connectable to the output shaft of the transmission via a first output member for obtaining a powersplit mode in which power is transmitted via the second sun wheel. ### Claim 2 (depends on 1) A transmission according to claim 1, wherein the transmission comprises a second output member for transmission of power to the output shaft of the transmission. ### Claim 3 (depends on 2) A transmission according to claim 2, wherein the shaft rotationally fixed to the second sun wheel is rotationally connectable to the output shaft of the transmission via the second output member for obtaining a further powersplit mode. ### Claim 4 (depends on 2) A transmission according to claim 2, wherein the planetary gear wheel unit comprises a ring wheel arranged for meshing engagement with the second set of planet wheels, a shaft rotationally fixed to the ring wheel being rotationally connectable to the output shaft of the transmission for obtaining a further powersplit mode, and the shaft rotationally fixed to the ring wheel is rotationally connectable to the output shaft of the transmission via the second output member. ### Claim 5 (depends on 2) A transmission according to claim 2, wherein the second output member is a gearwheel. ### Claim 6 (depends on 1) A transmission according to claim 1, wherein the planetary gear wheel unit comprises a ring wheel arranged for meshing engagement with the second set of planet wheels, a shaft rotationally fixed to the ring wheel being rotationally connectable to the output shaft of the transmission for obtaining a further powersplit mode. ### Claim 7 (depends on 6) A transmission according to claim 6, wherein the shaft rotationally fixed to the ring wheel is rotationally connectable to the output shaft of the transmission via the first output member. ### Claim 8 (depends on 1) A transmission according to claim 1, wherein the output shaft of the variator unit is rotationally connectable to the output shaft of the transmission for obtaining a variator mode. ### Claim 9 (depends on 8) A transmission according to claim 8, wherein the output shaft of the variator unit is rotationally connectable to the output shaft of the transmission via the first output member. ### Claim 10 (depends on 1) A transmission according to claim 1, wherein the transmission comprises a gear unit for providing forward and backward rotation of the output shaft of the transmission. ### Claim 11 (depends on 10) A transmission according to claim 10, wherein the forward and backward gear unit (35) is arranged at the input shaft of the transmission. ### Claim 12 (depends on 10) A transmission according to claim 10, wherein the forward and backward gear unit is arranged at the output shaft of the transmission. ### Claim 13 (depends on 1) A transmission according to claim 1, wherein the variator unit has a first hydraulic machine provided with the input shaft of the variator unit and a second hydraulic machine provided with the output shaft of the variator unit, the first and second hydraulic machines being hydraulically connected to each other. ### Claim 14 (depends on 1) A transmission according to claim 1, wherein the variator unit has a first electric machine provided with the input shaft of the variator unit and a second electric machine provided with the output shaft of the variator unit, the first and second electric machines being electrically connected to each other. ### Claim 15 (depends on 1) A transmission according to claim 1, wherein the first output member is a gearwheel. ### Claim 16 (depends on 1) A working machine comprising a transmission according to claim 1.