# US 7,611,433 B2 · Dual clutch hybrid powershift transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,433 B2 - Document ID: US7611433B2 - Status: Granted - Kind: B2 - Application number: 11/736,369 - Filed: 2007-04-17 - Published: 2007-11-08 - Granted: 2009-11-03 - Earliest claimed: 2006-05-05 - Assignees: Magna Powertrain USA, Inc. - Inventors: John R. Forsyth - Web page: https://patentgrep.com/patent/US7611433B2 ## CPC - F16H 3/006: {power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions} - B60K 6/40: characterised by the assembly or relative disposition of components - B60K 6/48: Parallel type - B60K 6/547: the transmission being a stepped gearing - F16H 3/725: {with means to change ratio in the mechanical gearing} - B60Y 2400/428: Double clutch arrangements; Dual clutches - F16H 37/042: {change gear transmissions in group arrangement} - F16H 2200/0052: the gear ratios comprising six forward speeds - Y02T 10/62: Hybrid vehicles - Y10S 903/91: Orbital, e.g. planetary gears - Y10S 903/919: Stepped shift - Y10T 74/19228: Multiple concentric clutch shafts - Y10T 74/19233: Plurality of counter shafts - F16H: GEARING - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A dual-clutch transmission for use in a motor vehicle having an engine and a driveline includes an output shaft adapted for connection to the driveline and a planetary gearset in constant driving engagement with the output shaft. An input shaft is driven by the engine. A first constant mesh gearset is in selective driving communication with a first member of the planetary gearset. A second constant mesh gearset is in selective driving communication with a second member of the planetary gearset. A first clutch is operable for establishing a releasable drive connection between the input shaft and the first constant mesh gearset. A second clutch is operable for establishing a releasable drive connection between the input shaft and the second constant mesh gearset. A motor is selectively drivingly coupled to a third member of the planetary gearset. ## Claims ### Claim 1 A dual-clutch transmission for use in a motor vehicle having an engine and a driveline, comprising: an input shaft driven by the engine; an output shaft adapted for connection to the driveline; a planetary gearset in constant driving engagement with said output shaft; a first constant mesh gearset selectably connectable with a first member of said planetary gearset; a second constant mesh gearset selectably connectable with a second member of said planetary gearset; a first clutch operable for establishing a releasable drive connection between said input shaft and said first constant mesh gearset; a second clutch operable for establishing a releasable drive connection between said input shaft and said second constant mesh gearset; and an electric motor selectively drivingly coupled to a third member of said planetary gearset. ### Claim 2 (depends on 1) The dual-clutch transmission of claim 1 wherein said planetary gearset is a compound planetary gearset, and wherein said output shaft is fixed to a fourth member of said compound planetary gearset. ### Claim 3 (depends on 2) The dual-clutch transmission of claim 2 wherein a first forward drive ratio is provided when a first torque path through said first clutch is established, wherein a second forward drive ratio is provided when a second torque path through said second clutch is established, and wherein a third forward drive ratio is provided when both the first and second torque paths are established. ### Claim 4 (depends on 1) The dual-clutch transmission of claim 1 further including a third constant mesh gearset driven by said input shaft and a gearset clutch operable to releasably couple said third constant mesh gearset to said third member of said planetary gearset. ### Claim 5 (depends on 1) The dual-clutch transmission of claim 1 further including a first device operable to restrict rotation of said first member of said planetary gearset. ### Claim 6 (depends on 1) The dual-clutch transmission of claim 1 wherein a gear associated with said first constant mesh gearset is rotatably supported on a first countershaft that surrounds a portion of said output shaft. ### Claim 7 A dual-clutch transmission for use in a motor vehicle having an engine and a driveline comprising: an input shaft driven by the engine; an output shaft adapted for connection to the driveline; a planetary gearset in constant driving engagement with said output shaft; a first countershaft fixed to a first member of said planetary gearset; a second countershaft fixed to a second member of said planetary gearset; a first engine clutch operable for establishing a releasable drive connection between said input shaft and a first transfer shaft; a second engine clutch operable for establishing a releasable drive connection between said input shaft and a second transfer shaft; a first constant mesh gearset driven by said first transfer shaft; a second constant mesh gearset driven by said second transfer shaft; first and second shift clutches, said first shift clutch operable to releasably drivingly couple said first gearset to said first countershaft, and said second shift clutch operable to releasably drivingly couple said second gearset to said second countershaft; and a motor selectively drivingly coupled to a third member of said planetary gearset. ### Claim 8 (depends on 7) The dual-clutch transmission of claim 7 further comprising a third constant mesh gearset driven by said second transfer shaft and a fourth constant mesh gearset driven by said first transfer shaft. ### Claim 9 (depends on 8) The dual-clutch transmission of claim 8 wherein said first shift clutch is operable to releasably couple said fourth gearset and said first countershaft, and wherein said second shift clutch is operable to releasably couple said third gearset and said second countershaft. ### Claim 10 (depends on 9) The dual-clutch transmission of claim 9 further including a fifth shift driven by said second transfer shaft. ### Claim 11 (depends on 10) The dual-clutch transmission of claim 10 further including a third shift clutch operable to releasably couple said fifth gearset to said second countershaft. ### Claim 12 (depends on 7) The dual-clutch transmission of claim 7 further including a controller for controlling actuation of said first and second engine clutches. ### Claim 13 (depends on 12) The dual-clutch transmission of claim 12 further including first and second actuators controlling said first and second engine clutches, respectively, said controller controlling actuation of said first and second actuators. ### Claim 14 (depends on 13) The dual-clutch transmission of claim 13 wherein said first and second shift clutches are electrically-actuated synchronizer clutches. ### Claim 15 (depends on 7) The dual-clutch transmission of claim 7 wherein said first transfer shaft surrounds a portion of said input shaft. ### Claim 16 (depends on 15) The dual-clutch transmission of claim 15 wherein said second transfer shaft surrounds another portion of said input shaft. ### Claim 17 (depends on 7) The dual-clutch transmission of claim 7 wherein said first and second constant mesh gearsets are axially positioned between said first engine clutch and said second engine clutch. ### Claim 18 (depends on 7) The dual-clutch transmission of claim 7 wherein said first and second engine clutches are normally closed clutches operable to transmit torque without an application of external force. ### Claim 19 (depends on 7) The dual-clutch transmission of claim 7 further including a third constant mesh gearset driven by said input shaft and a third shift clutch operable to releasably couple said third constant mesh gearset to said third member of said planetary gearset. ### Claim 20 (depends on 7) The dual-clutch transmission of claim 7 wherein said planetary gearset is a ravigneaux-type gearset. ### Claim 21 (depends on 20) The dual-clutch transmission of claim 20 wherein said output shaft is fixed to a fourth member of said planetary gearset. ### Claim 22 (depends on 7) The dual-clutch transmission of claim 7 further including a first device operable to restrict rotation of said first member of said planetary gearset. ### Claim 23 (depends on 22) The dual-clutch transmission of claim 22 further including a second device operable to restrict rotation of said second member of said planetary gearset. ### Claim 24 A dual-clutch transmission for use in a motor vehicle having an engine and a driveline comprising: an input shaft being driven by the engine; an output shaft adapted for connection to the driveline; a planetary gearset in constant driving engagement with said output shaft; a first clutch operable for establishing a releasable drive connection between said input shaft and a first transfer shaft; a second clutch operable for establishing a releasable drive connection between said input shaft and a second transfer shaft; a first constant mesh gearset driven by said first transfer shaft; a second constant mesh gearset driven by said second transfer shaft; first and second gearset clutches, said first gearset clutch operable to releasably drivingly couple said first gearset to a first member of said planetary gearset, said second gearset clutch operable to releasably drivingly couple said second gearset to a second member of said planetary gearset; and a motor selectively drivingly coupled to a third member of said planetary gearset. ### Claim 25 (depends on 24) The dual-clutch transmission of claim 24 wherein said planetary gearset is a compound planetary gearset, said output shaft is fixed to a fourth member of said compound planetary gearset. ### Claim 26 (depends on 25) The dual-clutch transmission of claim 25 further including a third constant mesh gearset driven by said input shaft and a third gearset clutch operable to releasably drivingly couple said third constant mesh gearset to said third member of said planetary gearset. ### Claim 27 (depends on 26) The dual-clutch transmission of claim 26 wherein said third gearset clutch is operable to selectively drivingly couple said motor to said third member of said planetary gearset. ### Claim 28 (depends on 24) The dual-clutch transmission of claim 24 wherein a first forward drive ratio is established when a first torque path including said first clutch is completed, a second forward drive ratio is established when a second torque path including said second clutch is completed, and a third forward drive ratio is established when both said first and second torque paths are completed. ### Claim 29 (depends on 28) The dual-clutch transmission of claim 28 wherein during operation in said first forward drive ratio said second member of said planetary gearset is restricted from rotation. ### Claim 30 (depends on 29) The dual-clutch transmission of claim 29 wherein during operation in said the second forward drive ratio said first member of said planetary gearset is restricted from rotation. ### Claim 31 (depends on 30) The dual-clutch transmission of claim 30 wherein during operation in said third forward drive ratio both of said first and second members of said planetary gearset are free to rotate.