Wikipedia

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,[1] an epicyclic gearset, which can provide more gear ratios with significantly fewer components than prior models could.

AWTF-80 SC
Overview
ManufacturerAisin Seiki
Production2005 – 2019
Model years2005 – 2019
Body and chassis
Class6-Speed transverse automatic transmission
RelatedLepelletier planetary gearset
Ford 6R
GM 6L
ZF 6HP
Chronology
PredecessorAisin TB-50LS
SuccessorAisin-Toyota 8-speed

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

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Gear ratios[a]
Model First
Deliv-
ery		 Gear Total Span Avg.
Step		 Components Nomenclature
R 1 2 3 4 5 6 Nomi-
nal		 Effec-
tive		 Cen-
ter		 Total per
Gear[b]		 Gears
Count		 Cou-
pling		 Gear-
sets		 Maximum Input Torque
Aisin AWTF-80 2005 −3.394 4.148 2.370 1.556 1.155 0.859 0.686 6.049 4.949 1.687 1.433 3
Gearsets
2 Brakes
3 Clutches		 1.333 6[b] TF[c] 450 N⋅m (332 lb⋅ft)
ZF 6HP All 2000[d] −3.403 4.171 2.340 1.521 1.143 0.867 0.691 6.035 4.924 1.698 1.433 H[e] P[f] 400 N⋅m (295 lb⋅ft) – 750 N⋅m (553 lb⋅ft)
  1. ↑ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
  2. 1 2 Forward gears only
  3. ↑ Installation: Transverse for front-engine, front-wheel-drive layout
  4. ↑ first transmission to use the Lepelletier planetary gearset concept
  5. ↑ Hydraulic torque converter · German: Hydraulischer Wandler oder Drehmomentwandler
  6. ↑ Planetary gearing · German: Planetenradsätze

History

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It is built in Anjō, Japan,[2] and is also called TF-80SC[3] (AWF21), AF40-6, AM6,[4] AW6A-EL and TF-81SC (AF21).[5] All-wheel drive transfer cases can be fitted to the AWTF-80 SC.

Specifications

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Gearset layout

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A conventional 5-pinion planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier planetary gearset,[1] 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.[citation needed]

Features
Maximum shaft speed 7,000/min 6,500/min
Maximum torque 350 N⋅m (258 lb⋅ft) 400 N⋅m (295 lb⋅ft)
Torque converter diameter 260 mm (10.2 in)
Length 358 mm (14.1 in)
Weight 90 kg (198 lb)

Gearbox control

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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

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Improved fuel economy

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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

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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

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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

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Variants and applications
Model Car Model[a]
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)[b]
  • 2016–2017 Countryman (F60)[c]
Fiat Chrysler Automobiles[d]
Alfa
Romeo
Fiat
Lancia
Ford Motor Company
Ford
Lincoln
Mercury
General Motors
Cadillac
Chevrolet
Opel
Vauxhall
Saab
Hyundai
Hyundai
Jaguar Land Rover
Jaguar
Land
Rover
Luxgen
Luxgen
Mahindra & Mahindra
Mahindra & Mahindra
Mazda
Mazda
PSA Group
Citroën
[u]
Peugeot
[v]
Renault
Renault
Suzuki
Suzuki
  • 2014–present Vitara (FWD & AWD)
  • 2015–present Baleno
  • 2017–present Swift
  • 2017–present SX4 S-Cross
Toyota Group & Lotus
Toyota
[w]
Lexus
Lotus
Lotus
Scion
  • 2011–2016 tC
Volkswagen Group
Audi
  • 2003–2013 A3
  • 2015–2018 Q3
Škoda
VW
Volvo
Volvo
  1. ↑ w/o any claim of completeness
  2. ↑ with 3 cylinder engines (B37 · B38)
  3. ↑ with 3 cylinder engines (B37 & B38 FWD)
  4. ↑ Predecessor of Stellantis
  5. ↑ 1.9 JTDm · 2.4 JTDm · 3.2 JTS[6]
  6. ↑ 2.4 JTDm · 3.2 JTS[6]
  7. ↑ 2.4 JTDm · 3.2 JTS[6]
  8. ↑ 1.9 JTDm · 2.4 JTDm
  9. ↑ 1.8 DI Turbo
  10. ↑ 3.5 L V6[7]
  11. ↑ 2.3 118 kW (160 PS) Petrol · 2.0 TDCi Diesel
  12. ↑ 2.3 118 kW (160 PS) Petrol (as standard gearbox)
  13. ↑ 1.9 D · 1.9 D (TST)
  14. ↑ 2.8 L
  15. ↑ US market · 2.0 L Turbo Diesel[2]
  16. ↑ 1.9 TiD · 1.9 TTiD · Aero 2.8 L
  17. ↑ 2.2 d
  18. ↑ 1.8 T · 2.0 T
  19. ↑ 2.0 T[8]
  20. ↑ 1.8 T · 2.0 T
  21. ↑ 1.6 THP · 2.0 HDİ
  22. ↑ 1.6 THP · 2.0 HDİ
  23. ↑ as Toyota U6xx · Toyota U760e
  24. ↑ 250 2012–2018
  25. ↑ 350 older models · 200t/300 new models
  26. ↑ 300 2018–present
  27. ↑ India, 2019 improvement
  28. ↑ D5 & D5 AWD · 3.2 · T6 & V8 AWD[12]
  29. ↑ 2.4 D · D5 & D5 AWD · 2.5 T & R AWD[7] (2006–2008)
  30. ↑ 2.4 D · D5 & D5 AWD · 2.5 T & R AWD (2006–2007)
  31. ↑ D5 & D5 AWD · 2.5 T · 2.5 FT · 3.2 · T6 & V8 AWD
  32. ↑ D4 AWD · D5 & D5 AWD · 2.5 T · 2.5 FT · 3.2 & T6 AWD[14]
  33. ↑ D4 AWD · D5 & D5 AWD · 2.5 T · 2.5 FT · 3.2 & T6 AWD[14]
  34. ↑ D4 AWD · D5 & D5 AWD · T6 AWD
  35. ↑ D5 & D5 AWD · T6 AWD
  36. ↑ D3
  37. ↑ D3
  38. ↑ D3 · D5 & D5 AWD · T6 AWD
  39. ↑ D3 · D4
  40. ↑ D3 · D4
  41. ↑ D3 · D4
  42. ↑ D3 · D4

See also

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References

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  1. 1 2 Riley, Mike (1 September 2013). "Lepelletier Planetary System". Transmission Digest. Archived from the original on 21 June 2023. Retrieved 3 March 2023.
  2. 1 2 "GM Engine Original Equipment Manufacturer | GM Powertrain" (PDF). Archived (PDF) from the original on 24 September 2015. Retrieved 16 September 2015.
  3. ↑ "Volvo Car Bookstore". Archived from the original on 26 March 2015. Retrieved 13 September 2015.
  4. ↑ "Archived copy" (PDF). Archived from the original (PDF) on 4 March 2021. Retrieved 4 June 2017.{{cite web}}: CS1 maint: archived copy as title (link)
  5. ↑ "Archived copy" (PDF). Archived from the original (PDF) on 4 March 2016. Retrieved 2 January 2015.{{cite web}}: CS1 maint: archived copy as title (link)
  6. 1 2 3 4 "Replacement Aisin Warner TCC Linear Solenoid with Black Connector". Rostra Powertrain Controls. Archived from the original on 22 May 2018. Retrieved 16 January 2019.
  7. 1 2 3 4 5 "Archived copy" (PDF). Archived from the original (PDF) on 4 March 2016. Retrieved 16 September 2015.{{cite web}}: CS1 maint: archived copy as title (link)
  8. ↑ "LUXGEN U6 VIETNAM". luxgen-motor.vn (in Vietnamese). Archived from the original on 11 August 2017. Retrieved 25 February 2018.
  9. 1 2 "Volvo Car USA, LLC. Bookstore:RTJ21096-2009-06-10". www.volvotechinfo.com. Archived from the original on 4 March 2016. Retrieved 26 November 2017.
  10. 1 2 3 4 5 "Volvo Car USA, LLC. Bookstore:TJ26840-2014-11-06". Archived from the original on 17 June 2016. Retrieved 26 November 2017.
  11. ↑ "Kraftstoffbetriebene Heizung, D5244T, TF-80SC" [Fuel powered heater, D5244T, TF-80SC] (Accessory installation instructions) (in English and German). Volvo Car Customer Service. Archived from the original on 25 February 2018. Retrieved 25 February 2018.
  12. ↑ "437: Transmission control module (TCM), TF-80SC AWD" (PDF). Volvo Car Corporation. 23 December 2013. Archived (PDF) from the original on 25 February 2018. Retrieved 25 February 2018.
  13. ↑ Volvo Car Corporation (2008). "Models - S80 - Technical Data - Volvo Car UK Media Newsroom". Archived from the original on 4 March 2016. Retrieved 13 September 2015.
  14. 1 2 3 "Volvo Car USA, LLC. Bookstore:RTJ20857-2009-04-15". www.volvotechinfo.com. Volvo Cars of North America. 15 April 2009. Archived from the original on 25 February 2018. Retrieved 25 February 2018.
  15. ↑ "Volvo V50 owner's manual (MY12)" (PDF). Volvo Car Corporation. 2011. p. 312. Archived (PDF) from the original on 13 April 2016. Retrieved 16 January 2019. · German: Volvo V50 Betriebsanleitung (Modelljahr 2012)
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