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Dual-clutch transmission

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188: 40: 121: 2737: 2727: 464:, a 7-speed DCT using two dry-clutches arranged side-by-side (instead of concentrically). Volkswagen claims fuel economy improvements of 6% compared with a 6-speed manual and 20% compared with a traditional (hydraulic) automatic transmission. DCT transmissions have been used on vehicles sold by Alfa Romeo, Volkswagen, Audi, Tata Motors, SEAT, Skoda, and Bugatti, mostly marketed using the term 559: 759: 128:
The fundamental principle of a DCT is that one clutch drives a gear-set for the even-numbered gears, while the other clutch drives the odd-numbered gears. Since the DCT can pre-select an odd gear while the vehicle is being propelled in an even gear (or vice versa), DCTs can shift several times faster
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used by traditional (hydraulic) automatic transmissions. The DCT clutches are either "wet" or "dry" and are similar to the clutches used in most motorcycles. Wet-clutches are bathed in oil to provide cooling for the clutch surface, therefore wet-clutches are often used in applications with higher
545:('shifting under load') function, which needs to be pre-selected by the driver and then activated by pressing the clutch halfway down. This engages the second clutch, which applies a reduction gear to the driven wheels without any interruption in the torque transmission to the wheels. 258:
Porsche began development of DCTs for racing cars in the late 1970s, due to the possibility of a DCT preventing a drop in boost during gear shifts on a turbocharged engine. As the electronics required to control the transmission became compact enough to be practical, the
525:(a device typically used in hydraulic automatic transmissions) paired with its 8-speed DCT. The purpose of the torque converter is to improve the smoothness of low-speed driving, through the elimination of jolting and shuddering sometimes found in DCTs at low speed. 163:) use a similar arrangement where the clutches are located on the same axis of the flywheel. The difference is that the clutches are at different positions on this axis (i.e. one in front of the other) and the same size as each other. This design is used by the 615:. The two clutches are placed one on the gearbox input shaft and the other on the gearbox output shaft. To make a gear change, both clutches disengage simultaneously and a brake inside the gearbox engages. The gearchange occurs with all gears stationary, so no 887: 957: 129:
than is possible with a manual transmission. By timing the operation of one clutch to engage at the precise moment that the other is disengaging, a DCT can shift gears without interrupting the torque supply to the wheels.
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is the first motorcycle to use a DCT. Honda has since expanded the application of the DCT to the Gold Wing model (model year 2018), the Africa Twin, the NT1100, Rebel 1100, and the NC700XD (model year 2012).
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is a 7-speed DCT which is designed for high-performance engines and has a torque rating of 750 N⋅m (553 lbf⋅ft). It is used in mid-engined sports cars such as the 2009
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sports car, an early application for DCTs involving high torque loads. The company supplies several car manufacturers with complete transmission units, wet-clutches and/or
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transmission) arranges two identical-size clutches located side-by-side. This design requires two side-by-side input shafts, which are driven from the crankshaft via gears.
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began production of DCTs in 2008 and has supplied manufacturers including BMW, Dacia, Dodge, Ferrari, Mercedes-Benz, Ford, Mitsubishi, Renault, Smart and Volvo. The
2761: 849:"Automatic-shifting dual-clutch transmissions are poised to grab share from traditional transmissions thanks to their combination of efficiency and convenience" 1706: 2196: 1311: 1002: 2110: 460:), with two wet-clutches arranged concentrically, has been used in several Volkswagen and Audi models. In 2008, Volkswagen group began production of the 362:
manufactures DCTs for some Honda motorcycles as of 2024, and was the first to add a DCT to motorcycles. Honda also previously manufactured DCTs for some
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was offered as an option on Hillman and Singer models, however it was not a reliable device and many were replaced by conventional manual transmissions.
468:(except for Alfa Romeo, which has used the term TCT, also Tata Motors uses the term DCA (Dual Clutch Automatic) and Audi, which has also used the term 576: 914: 2174: 2144: 93:
mid-size car. This was followed by various eastern European tractors through the 1970s (using manual operation via a single clutch pedal), then the
101:. Since the late 2000s, DCTs have become increasingly widespread, and have supplanted hydraulic automatic transmissions in various models of cars. 932: 619:
is needed. After the gear change, both clutches re-engage. There is a significant break in power transmission, so this system is unsuitable for
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with their respective clutches contained within one housing, and working as one unit. In car and truck applications, the DCT functions as an
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provides the 8-speed DCT used in the 2020 Chevrolet Corvette C8 and the 7-speed DCT used in the 2020 Ford Mustang Shelby GT500.
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DCTs have been used by Volkswagen Group since 2008, in several smaller cars with relatively low torque outputs.
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manufactures dry 7-speed and wet 8-speed DCTs as of 2024. The DCTs are used in some Hyundai and Kia vehicles.
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model introduced to the Volkswagen Golf range in 2003. The company have produced many of the DCTs used by the
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unit developed in the late 1950s by UK's Smiths Industries and Rootes. This DCT – introduced on the 1961
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DCT based on a concentric clutch layout (inside the round black cover, shown in the center of the image)
1389: 2536: 2471: 1744: 312: 1040: 403:, which has a turbocharged 16-cylinder engine producing 1,250 N⋅m (922 lbf⋅ft) of torque. 2561: 2541: 2326: 660: 641: 453: 283: 221: 98: 75: 2726: 2707: 2612: 1896: 538: 484: 437: 160: 1209: 2501: 2388: 2370: 2028: 1522: 2576: 2383: 1483: 1235: 522: 385: 307: 133: 109: 2199:(Press release). Porsche Cars Great Britain Ltd. / Dr. Ing. h.c. F. Porsche AG. 6 June 2008 2596: 2526: 1922: 344: 276: 187: 120: 39: 933:"Holy Shift! Koenigsegg's Wild Manual Transmission Has 7 Clutches—and an Automatic Mode" 2697: 2511: 2506: 2397: 2393: 1889:"ZF in the Porsche 911 Carrera: Porsche Carrera — Versatility with sports car genetics" 1572: 534: 507: 499: 476: 415: 400: 168: 138: 2755: 2740: 2679: 2664: 2644: 2571: 2408: 2378: 1602:
http://www.autonews.com/apps/pbcs.dll/article?AID=/20091101/CUTAWAY01/910299984/1193#
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Schematic of a DCT (using two identical clutches located on the axis of the flywheel)
1793:"LuK dual-dry-clutch 7-speed DSG gearbox in volume production at Volkswagen (Group)" 156:. Therefore, the outer clutch pack has a larger diameter than the inner clutch pack. 2649: 2586: 2556: 2551: 2058: 859: 321: 236: 90: 1862: 1312:"Shift This: A History of Porsche's Sportomatic, Tiptronic, and PDK Transmissions" 793: 2730: 2654: 2627: 2622: 2486: 2476: 2436: 1415: 1337: 616: 558: 492: 480: 396: 340: 317: 268: 264: 244: 144:
Several arrangements for the two clutches are possible, and are outlined below:
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Le Mans racing car in 1983. The first use of a PDK in competition was the 1985
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has a transmission with one clutch per gear, making for a total of 7 clutches.
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Usage in high performance cars began in 2005 with the 7-speed DCT used in the
411: 299: 149: 71: 263:('dual-clutch gearbox') (PDK) transmission was installed as a prototype in a 2669: 2659: 2581: 2546: 687: 518: 1456: 17: 1484:"Dual-Clutch technology voted Transmission of The Future at CTI Symposium" 758: 316:
for Volkswagen-branded cars) and produced various components for the 2007
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The concept of a dual-clutch transmission was invented by French engineer
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torque loads, such as the 1,250 N⋅m (922 lbf⋅ft) engine in the
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racing car in 1985. The first DCT of the modern era was used in the 2003
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A DCT uses clutch packs (as per a manual transmission), rather than the
1985: 612: 583: in this section. Unsourced material may be challenged and removed. 348: 2197:"New Porsche 911 with Direct Fuel Injection and Double-Clutch Gearbox" 1767:"The Ford GT's Gearbox Is Shared With the AMG GT, Costs Twice as Much" 2632: 2446: 2219:"Porsche Doppelkupplung (PDK) — 911 Carrera & 911 Targa 4 Models" 2137:"2008 Mitsubishi Lancer Evolution X MR: Are Shift Paddles for Wimps?" 1076:"The 7-speed DSG — the intelligent automatic gearbox from Volkswagen" 426: 332: 104:
More generally, a transmission with several clutches can be called a
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Several 1970s tractors from eastern European countries (such as the
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manufactures the electrified dual-clutch transmission (eDCT) at the
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A different type of dual-clutch transmission has been used in some
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The first mass-production passenger car to use a DCT was the 2003
186: 119: 38: 2639: 2113:(Press release). Mitsubishi Motors. 10 July 2007. Archived from 1863:"FEATURE: ZF's new 7DT 'Mood-Sensing' Dual-Clutch Transmissions" 2322: 1573:"Getrag Jumps Into DCT Fray With High-Performance Applications" 2360: 915:"Here's How the Koenigsegg Jesko's Seven-Clutch Gearbox Works" 552: 2318: 1954:. The Lubrizol Corporation. 24 September 2009. Archived from 479:. Other early high performance applications include the 2007 1799:. Schaeffler Group USA Inc., BÜHL, GERMANY. 13 February 2008 1825:. The Lubrizol Corporation. 16 January 2009. Archived from 794:"Powertrain — transmissions: Shift in power to the gearbox" 537:
derivatives) used manually-operated DCTs. For example, the
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transmission became the first DCT to be used in a truck.
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Volkswagen Service Training Manual 308 — 02E 6-speed DSG
1160:"TREMEC Introduces New 7-Speed Dual Clutch Transmission" 275:
in 1986. The PDK transmission was also used in the 1985
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produced the first mass-production DCT, as used in the
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in 1939. The transmission was intended for use in the
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produce the 7-speed DCT used by Porsche (marketed as
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designed and built 7-speed DCT used by the 2005-2015
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Schematic diagram of a type of dual-clutch gearbox:
1009:. Findlay Media Ltd. 13 March 2009. Archived from 2298:"Honda's new 8-speed DCT uses a torque converter" 2057:. Aichi Machine Industry Co., Ltd. Archived from 1546:"Getrag's dual-clutch transmissions to take off" 1478: 1476: 1474: 74:. The design is often similar to two separate 2334: 2276:"First double-clutch transmission in a truck" 2081:"Ferrari chooses DCT for its latest supercar" 1443: 1441: 805:. UnofficialBMW.com. September–October 2003. 722: 152:clutch packs located on the same axis as the 82:, requiring no driver input to change gears. 8: 2173:. The Motor Report Pty. Ltd. 14 April 2008. 1707:"Renault Megane CC dual clutch transmission" 1364:"Here's What the Porsche PDK Gearbox Means" 2341: 2327: 2319: 2087:. The Lubrizol Corporation. Archived from 1984:. The Lubrizol Corporation. Archived from 1039:. The Lubrizol Corporation. Archived from 729: 715: 630: 85:The first DCT to reach production was the 2143:. Edmunds Inc. 6 May 2009. Archived from 858:. DCTfacts.com. June 2009. Archived from 599:Learn how and when to remove this message 231:One of the first production DCTs was the 89:automatic transmission introduced on the 1737:"GETRAG Powershift 7DCL750 transmission" 1490:. Gordon Communications. 11 March 2009. 1261:"A Useful Text-Book - The Motor Vehicle" 997: 995: 993: 991: 989: 987: 1070: 1068: 1066: 1064: 1062: 1060: 1058: 776: 668: 640: 633: 452:Following its 2003 introduction in the 1655:from the original on 20 February 2010 1645:"2010 Ferrari 458 Italia First Drive" 1625:from the original on 16 February 2010 1583:from the original on 13 February 2009 952: 950: 948: 946: 843: 841: 839: 837: 835: 833: 831: 829: 827: 788: 786: 784: 782: 780: 7: 2762:Automotive transmission technologies 1686:from the original on 11 January 2010 1515:"BorgWarner Refining DCT Technology" 1494:from the original on 3 February 2010 1426:from the original on 6 November 2009 1210:"How Dual-clutch Transmissions Work" 1185:"How dual-clutch transmission works" 581:adding citations to reliable sources 159:Many DCTs for tractors (such as the 2177:from the original on 29 August 2009 2051:"Aichi Kikai manufacturing history" 2027:. SAE International. Archived from 1903:from the original on 21 August 2009 2457:Continuously variable transmission 2167:"SS-T: The Magic Inside the Evo X" 2021:"BorgWarner DCT for Nissan's GT-R" 1923:"7-Speed Dual Clutch Transmission" 1869:. CSM Worldwide. 23 September 2009 1390:"Porsche 962 and PDK transmission" 968:. 22 November 2002. Archived from 271:Le Mans racing car, which won the 251:to implement the gear shifts. The 198:A: Primary drive and driving shaft 25: 1544:Lewin, Tony (17 September 2007). 1086:. 21 January 2008. Archived from 812:from the original on 17 July 2011 2736: 2735: 2725: 2246:"2010 Honda VFR1200F First Look" 1747:from the original on 5 June 2009 1674:**TIME AGO** (4 November 2009). 1613:Pund, Daniel (6 November 2008). 1571:Robinson, Peter (28 July 2008). 1455:. BorgWarner Inc. Archived from 757: 557: 2244:Atlas, Steve (8 October 2009). 568:needs additional citations for 261:Porsche Doppelkupplungsgetriebe 207:D: Layshaft, hollow, even gears 174:Another design (as used by the 888:"Porsche Doppelkupplung (PDK)" 55:) (sometimes referred to as a 1: 2492:Automated manual transmission 2225:. Dr. Ing. h.c. F. Porsche AG 1003:"Dual clutches take the lead" 962:Volkswagen-Media-Services.com 913:Fenske, Jason (8 July 2019). 890:. Porsche.com. Archived from 489:Mitsubishi Lancer Evolution X 148:Most automotive DCTs use two 1135:"ZT300 doppelkupplung image" 456:, a 6-speed DCT (model code 273:World Sportscar Championship 32:Double-clutching (technique) 27:Type of vehicle transmission 2567:Semi-automatic transmission 1978:"Porsche Joins the DCT Set" 1552:. Crain Communications, Inc 1164:www.eastsidemotorsports.com 1033:"Wet-Clutch or Dry-Clutch?" 743:Fuel economy in automobiles 59:) is a type of multi-speed 2783: 2404:Internal combustion engine 1743:. GETRAG Corporate Group. 1449:"BorgWarner — Our History" 1416:"The Porsche Transmission" 1265:www.motorsportmagazine.com 1110:"Two Clutches, No Waiting" 237:Hillman Minx (Series IIIC) 29: 2767:Dual-clutch transmissions 2721: 2703:Hybrid vehicle drivetrain 2592:Transmission control unit 2532:Limited-slip differential 2497:Electrorheological clutch 2356: 1577:Subscribers.wardsauto.com 416:Mirafiori Automotive Park 241:electro-magnetic clutches 169:Ford Mustang Shelby GT500 106:multi clutch transmission 66:, that uses two separate 2482:Dual-clutch transmission 1139:www.ddr-landmaschinen.de 764:dual-clutch transmission 635:Automotive transmissions 57:twin-clutch transmission 49:dual-clutch transmission 30:Not to be confused with 2452:Constant-velocity joint 617:synchronizing mechanism 448:Usage in motor vehicles 2432:Automatic transmission 1550:Automotive News Europe 1291:www.excellence-mag.com 1287:"The PDK Transmission" 418:in Italy as of 2024. 243:, along with analogue 226:Citroën Traction Avant 217: 210:E: Layshaft, odd gears 125: 80:automatic transmission 44: 2171:TheMotorReport.com.au 1897:ZF Friedrichshafen AG 1214:www.howstuffworks.com 698:Continuously variable 277:Audi Sport Quattro S1 190: 167:DCT used by the 2020 123: 42: 2537:Locking differential 2472:Direct-shift gearbox 2117:on 29 September 2007 1771:www.roadandtrack.com 1651:. 10 November 2009. 1316:www.caranddriver.com 1114:www.corvette-mag.com 766:at Wikimedia Commons 621:shunting locomotives 577:improve this article 543:Unterlastschaltstufe 466:Direct-Shift Gearbox 76:manual transmissions 2562:Preselector gearbox 2542:Manual transmission 2031:on 19 November 2009 1829:on 27 February 2009 1717:on 23 December 2009 1090:on 16 December 2010 454:Volkswagen Golf R32 284:Volkswagen Golf R32 279:Group B rally car. 108:. For example, the 99:Volkswagen Golf R32 64:transmission system 2708:Electric generator 2613:Wheel hub assembly 2286:on 4 October 2011. 2256:on 11 October 2009 2091:on 10 October 2009 1958:on 16 October 2009 1519:Wardsautoworld.com 1488:TheAutoChannel.com 1318:. 10 December 2013 1240:www.andymurkin.net 1013:on 20 October 2009 894:on 5 December 2008 539:Fortschritt ZT 300 485:Ferrari California 438:ZF Friedrichshafen 433:ZF Friedrichshafen 218: 161:Fortschritt ZT 320 126: 45: 2749: 2748: 2502:Epicyclic gearing 2371:Automotive engine 2141:Blogs.Edmunds.com 2061:on 19 August 2010 1988:on 1 October 2009 1773:. 9 November 2018 1396:. 24 October 2008 1394:www.flatsixes.com 1370:. 22 January 2018 1342:www.stuttcars.com 964:(Press release). 939:. 19 August 2022. 865:on 7 October 2011 762:Media related to 739: 738: 609: 608: 601: 549:Usage in railcars 529:Usage in tractors 493:Porsche 911 (997) 324:control modules. 239: – used two 91:1961 Hillman Minx 70:for odd and even 16:(Redirected from 2774: 2739: 2738: 2729: 2606:Wheels and tires 2577:Torque converter 2343: 2336: 2329: 2320: 2313: 2312: 2310: 2308: 2294: 2288: 2287: 2282:. 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Index

Dual-clutch
Double-clutching (technique)

vehicle
transmission system
clutches
gear sets
manual transmissions
automatic transmission
1961 Hillman Minx
Porsche 962 C
Volkswagen Golf R32
Koenigsegg Jesko

torque converter
Bugatti Veyron
concentric
flywheel
Fortschritt ZT 320
Ford Mustang Shelby GT500

Adolphe Kégresse
Citroën Traction Avant
Hillman Minx (Series IIIC)
electro-magnetic clutches
electronics
solenoids
Porsche 956
Porsche 962 C
World Sportscar Championship

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