AWTF-80 SC

The Aisin AW TF-8# SC series is a 6-speed automatic transmission designed for use in transverse engine applications produced by Aisin Seiki. It uses a Lepelletier planetary gearset, an epicyclic gearset, which can provide more gear ratios with significantly fewer components than prior models could.

It was first realized in 2000 with the 6HP from ZF Friedrichshafen. The Ford 6R, GM 6L, and ZF 6HP transmissions are based on the same globally patented gearset concept. The AWTF-80 SC is the only one for transverse engine installation.

Key data

+ Gear ratios Model FirstDeliv-ery Gear Total Span Avg.Step Components Nomenclature R 1 2 3 4 5 6 Nomi-nal Effec-tive Cen-ter Total perGear GearsCount Cou-pling Gear-sets Maximum Input Torque Aisin AWTF-80 2005 3Gearsets2 Brakes3 Clutches 6 TF ZF 6HP All 2000 H P –

History

It is built in Anjō, Japan, and is also called TF-80SC (AWF21), AF40-6, AM6, AW6A-EL and TF-81SC (AF21). All-wheel drive transfer cases can be fitted to the AWTF-80 SC.

Specifications

Gearset layout

A conventional 5-pinion planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier planetary gearset, to reduce both the size and weight. This means the Aisin AW TF-8# SC series is actually lighter than its five-speed predecessors.

Like all transmissions realized with Lepelletier planetary gearset, the AWTF-80 SC also dispenses with the use of the direct gear ratio, making it one of the very few automatic transmission concepts without such a ratio. It has a torque converter lock-up for all 6 forward gears, which can be fully disengage when stationary, largely closing the fuel efficiency gap between vehicles with automatic and manual transmissions.

+ Features Maximum shaft speed 7,000/min 6,500/min Maximum torque Torque converter diameter Length Weight

Gearbox control

To reduce external wiring as well as to provide a constant environment for the transmission control module (TCM), it is located inside the transmission housing. Gear shifting is managed by a computer program that oversees a clutch-to-clutch actuation that allows one clutch engage the instant the clutch from the previous gear disengages. When idling and with the foot brake depressed neutral gear is selected automatically. This helps to reduce internal temperatures and improve the fuel economy.

Planetary gearset concept

Improved fuel economy

The main objective in replacing the predecessor model was to improve vehicle fuel economy with extra speeds and a wider gear span to allow the engine speed level to be lowered (downspeeding), which is a decisive factor in improving energy efficiency and thus reducing fuel consumption. In addition, the lower engine speed level improves the noise-vibration-harshness comfort and the exterior noise is reduced. It has a torque converter lock-up for all 6 forward gears, which can be fully disengage when stationary, largely closing the fuel efficiency gap between vehicles with automatic and manual transmissions.

Reduced manufacturing complexity

In order to avoid a further increase in manufacturing complexity while expanding the number of gear ratios, ZF switched from the conventional design method—in which the planetary gearset concept was limited to a purely serial or in-line power flow—to a more modern design method that utilizes a planetary gearset concept with combined parallel and serial power flow. This was only possible thanks to computer-aided design and has resulted in a globally patented gearset concept. The AWTF-80 is based on the 6HP from ZF, which was the first transmission designed according to this new paradigm. After gaining additional gear ratios only with additional components, this time the number of components has to decrease while the number of ratios still increase. The resulting progress is reflected in a much better ratio of the number of gears to the number of components used compared to existing layouts.

Quality

The ratios of the 6 gears are evenly distributed in all versions. Exceptions are the large step from 1st to 2nd gear and the almost geometric steps from 3rd to 4th to 5th gear. They cannot be eliminated without affecting all other gears. As the large step is shifted due to the large span to a lower speed range than with conventional gearboxes, it is less significant. As the gear steps are smaller overall due to the additional gear(s), the geometric gear steps are still smaller than the corresponding gear steps of conventional gearboxes. Overall, therefore, the weaknesses are not overly significant. As the selected gearset concept saves up to 2 components compared to 5-speed transmissions, the advantages clearly outweigh the disadvantages.

The layout brings the ability to shift in a non-sequential manner – going from gear 6 to gear 2 in extreme situations simply by changing one shift element (actuating clutch E and releasing brake A).

Applications

+ Variants and applications Model Car Model BMW Group BMW 2014–2020 i8 2015–present 225xe Active Tourer (F45) 2020–present X1 xDrive 25e (F48) 2020–present X2 xDrive 25e (F39) Mini 2014–2017 Cooper (F56/55) 2015–2017 Clubman (F54) 2016–2017 Countryman (F60) Fiat Chrysler Automobiles AlfaRomeo 2005–2011 159 2005–2010 Brera 2006–2010 Spider Fiat 2005–2011 Croma 2012–2019 500 Lancia 2008–2014 Delta Ford Motor Company Ford 2005–2007 Five Hundred 2006–2012 Ford Fusion (US) 2007–2014 Mondeo MkIV 2006–2014 Galaxy Lincoln 2006 Zephyr 2007–2012 MKZ Mercury 2005–2010 Milan 2005–2007 Montego General Motors Cadillac 2005–2010 BLS 2009–2016 SRX II Chevrolet 2008–2016 Cruze OpelVauxhall Astra Vectra Signum Zafira 2008–2017 Insignia 2014–2017 Meriva Saab 2006–2014 9-3 II (FWD & AWD) 2013–2014 9-3 III 2010–2012 9-5 II Hyundai Hyundai 2006–2014 Veracruz Jaguar Land Rover Jaguar 2007–2009 X-Type LandRover 2006–2014 Freelander 2 2011–2013 Evoque Luxgen Luxgen 2013–2015 S5 2.0 T 2015-2019 S5 ecohyper 2019–Present S5 GT (GT 225) · 1.8 T 2014–2015 U6 2015–2018 U6 ecohyper 2018–Present Luxgen U6 GT (GT 220) 1.8 T 2016–Present Luxgen M7 ecohyper 2.2 T 2016–Present Luxgen U7 ecohyper 2.2 T 2019–Present URX 1.8 T Mahindra & Mahindra Mahindra & Mahindra 2015–present XUV 500 Mazda Mazda 2005–2008 6 I 2006–2012 CX-7 2006–present CX-9 2006–present MPV III 2007–2012 6 II PSA Group Citroën C4 C5 C6 DS3 DS4 DS5 2010–2016 Jumpy C-Elysée Peugeot 2006–2008 307 2014–2018 308 2005–2010 407 2010–present 408 (Saloon) 2011–2018 508 2005–2010 607 2008– 3008 2009– 5008 2010–2016 Expert Renault Renault 2005–2009 Vel Satis 2006–2010 Espace Suzuki Suzuki 2014–present Vitara (FWD & AWD) 2015–present Baleno 2017–present Swift 2017–present SX4 S-Cross Toyota Group & Lotus Toyota 2006–2008 Previa (V6) 2007–2018 Camry 2007–2017 Aurion (V6) 2007–2012 Blade (V6) 2007–2013 Mark X Zio (V6) 2008–2016 Highlander 2008–2017 Alphard (V6) 2008–2018 Avalon 2008–2018 RAV4 2009–2017 Venza 2011–2016 Sienna 2017 ProAce Lexus 2007–2018 ES250 & ES350 2010–2022 RX 2015–2021 NX200t 2019–2023d LM350 (HK) Lotus Lotus 2012 Evora (IPS) 2022– Emira (V6) Scion 2011–2016 tC Volkswagen Group Audi 2003–2013 A3 2015–2018 Q3 Škoda Octavia Rapid VW 2003–2010 Transporter 2007 Jetta 2009–2017 Tiguan 2012–2022 Passat 2019–present Polo (MK5) (India) Volvo Volvo 2005–2014 XC90 (FWD & AWD) 2006–2009 S60 (FWD & AWD) 2006–2008 Volvo V70 II (FWD & AWD) 2006–2008 XC70 (AWD) 2007–2016 S80 II (FWD & AWD) 2008–2016 V70 III (FWD & AWD) 2008–2016 XC70 II (FWD & AWD) 2009–2017 XC60 (FWD & AWD) 2011–2018 S60 II (FWD & AWD) 2016–2017 S90 (FWD) 2016–2018 V90 (FWD) 2011–2018 V60 (FWD & AWD) 2011–2012 S40 II (FWD) 2011–2012 V50 · (FWD) 2011–2013 C30 (FWD) 2011–2013 C70 II (FWD) 2012–2014 V40 II (FWD)

AWTF-80 SC

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