Aisin–Toyota 8-speed automatic transmission explained

AA 80E/F · AE 80E/F · AL 80E/F
TR-80SD · TR-81SD · TR-82SD
AW F8 F35 · AW F8 F45
Aka:BMW/Mini GA 8F 22AW
Volvo TG-81SC/SD
GM AW F8 F45 & AF50-8
VW AQ 450
PSA EAT8
Production:2006–present
Manufacturer:Toyota · Aisin AW
Class:8-speed automatic transmission
Predecessor:AWTF-80 SC transmission
Related:ZF 8HP · GM 8L · MB 9G-Tronic · ZF 9HP

Aisin and Toyota offer various 8-speed automatic transmissions for use in both longitudinal[1] and transverse[2] engine vehicles, based on a common, globally patented gearset concept.[1] [2]

The Aisin TL-80SN (Toyota AA 80E/AA 80F/AA 81E) series is the world's first 8-speed automatic transmission for passenger cars.[3] It is designed for longitudinal engines[1] and was first used in the 2007 model year Lexus LS 460.

Beginning with the AW F8 transmission Aisin and Toyota derived a transverse engine variant[2] by adapting this globally patented gearset concept to fit into the same space as the previous generation U6xx Lepelletier gear mechanism-based 6-speed transmissions to increase the overall ratio spread, reduce gear steps, and increase the torque capacity for transverse engine vehicles as well.[4]

The Aisin AW F8 F45 (Toyota UA 80E/UA 80F) series is the world's first 8-speed automatic transmission designed for use in transverse engine[2] applications.[5] It is also called EAT8 (PSA), GA 8F 22AW (BMW/Mini), TG-81SC (Volvo), AF50-8 (Opel/Vauxhall),[6] AW F8 F45 (Cadillac), and AQ 450 (Volkswagen Group).[7] First usage was in the 2013 model year Lexus RX 350 F Sport.

Toyota’s marketing name for the transmission is "Direct Shift – 8AT 8-speed automatic transmission".[8] [9] In contrast to the UB 80E/F transmission, which was developed by Aisin AW for Toyota, the UA 80E/F was developed in a joint venture between Toyota and Aisin AW. Due to its worldwide application, development was carried out in a global manner involving R&D resources in Japan and the US. The Aisin AW F8 F35 (Toyota UB 80E/F) transmissions are used for lower torque applications, such as 4-cylinder engines, and rated for 300Nm.[10]

Specifications

Layout (Gearset Concept)

All 8-speed automatic transmissions from Aisin and Toyota for passenger cars are based on the same layout[1] [2] in both engines orientations.[1] [2] For transverse installation,[2] the layout of the longitudinal installation[1] was merely mirrored.[1] [2] Gearset 1 is not an ordinary one, but a reversed one. It consists of 2 pinions that mesh with each other. One of these pinions meshes with the sun gear, the other with the ring gear. As a results, the gearset generates different ratios and the sun gear rotates in the same direction as the ring gear when the planetary gear carrier is stationary. This made it possible to manage 8 speeds with 3 gearsets. As a result, the transmission is more compact than 8-speed transmissions from competitors. This means that an 8-speed automatic transmission was also possible for transverse engines.

Progress

Smaller parts and a hydraulic circuit with fewer components allow the transmission to maintain the same size as the previous LS 430's 6-speed transmission. The aluminum die-cast case is 10 % lighter, yet 30 % more rigid, even with two additional gears and a 22 % greater torque capacity the new transmission weighs 95kg (209lb) or 10 % more than the previous unit. With new micro-laser technology gear tooth production tolerances have been reduced 50 %. Aluminum has also replaced steel on gear tooth surfaces. Shift times are as low as 350 milliseconds or 41 % faster than the previous LS 430's unit.

The Lexus IS F and LS 460 (with sport package) use Sport Direct Shift (SPDS) which allows for faster shift times. The torque converter can lockup from 2nd to 8th gears.

Two Possible Reverse Gears R1 and R2

The gearset concept offers 2 reverse gears. Due to the increasing electronic control of automatic transmissions and engines, a fast reverse gear (i.e. designed to reduce wheel spin) is no longer necessary for problem-free starting in icy conditions (winter mode). It is therefore unlikely that car manufacturers will make use of this special option of a dedicated winter mode with an additional reverse gear R2. For this reason, the representation of In some data sheets, the gear ratio of R2 is given, presumably a careless error.[1]

The direction is reversed in gearset 3, the outer one of the Ravigneaux gearset. In the fast reverse gear R2, this part of the Ravigneaux gearset is directly connected to the input (turbine) side. To reduce the shaft speed for an appropriate reverse gear R1, the input (turbine) is put through gearset 1 first. This reduction corresponds to the ratio of the 3rd gear. Therefore, the gear step between the two reverse gears reflects the ratio of the 3rd gear.

R1 And R2!Gear!Ratio · Algebra
R2

iR2=-\tfrac{R3}{S3}

[11] [12]
3

i3=\tfrac{R1}{R1-S1}

R2 x 3

iR2i3=-\tfrac{R3}{S3}\tfrac{R1}{R1-S1}=\tfrac{R3}{S3}\tfrac{R1}{S1-R1}

R1

iR1=\tfrac{R1R3}{S3(S1-R1)}=iR2i3

Ratios

With Assessment!colspan=3
Planetary Gearset: TeethCountTotal
Center
Avg.
ReversedRavigneaux
Aisin
Toyota
Version
First Delivery
S1
R1
S2
R2
S3
R3
Brakes
Clutches
Ratio
Span
Gear
Step
Gear
Ratio

{iR2

}
R1

{iR1

}
1

{i1}

2

{i2}

3

{i3}

4

{i4}

5

{i5}

6

{i6}

7

{i7}

8

{i8}

Step

\tfrac{iR1

}

-\tfrac{iR1

}

\tfrac{i1}{i1}

\tfrac{i1}{i2}

\tfrac{i2}{i3}

\tfrac{i3}{i4}

\tfrac{i4}{i5}

\tfrac{i5}{i6}

\tfrac{i6}{i7}

\tfrac{i7}{i8}

Δ Step

\tfrac{i1}{i2}:\tfrac{i2}{i3}

\tfrac{i2}{i3}:\tfrac{i3}{i4}

\tfrac{i3}{i4}:\tfrac{i4}{i5}

\tfrac{i4}{i5}:\tfrac{i5}{i6}

\tfrac{i5}{i6}:\tfrac{i6}{i7}

\tfrac{i6}{i7}:\tfrac{i7}{i8}

Shaft
Speed

\tfrac{i1}{iR2

}

\tfrac{i1}{iR1

}

\tfrac{i1}{i1}

\tfrac{i1}{i2}

\tfrac{i1}{i3}

\tfrac{i1}{i4}

\tfrac{i1}{i5}

\tfrac{i1}{i6}

\tfrac{i1}{i7}

\tfrac{i1}{i8}

Δ Shaft
Speed

\tfrac{i1}{iR1

} - \tfrac

0-\tfrac{i1}{iR1

}

\tfrac{i1}{i1}-0

\tfrac{i1}{i2}-\tfrac{i1}{i1}

\tfrac{i1}{i3}-\tfrac{i1}{i2}

\tfrac{i1}{i4}-\tfrac{i1}{i3}

\tfrac{i1}{i5}-\tfrac{i1}{i4}

\tfrac{i1}{i6}-\tfrac{i1}{i5}

\tfrac{i1}{i7}-\tfrac{i1}{i6}

\tfrac{i1}{i8}-\tfrac{i1}{i7}

Longitudinal engines
TL-80SN
AA 80E/F
550Nm · 200638
82
30
34
34
74
2
4

Gear
Ratio

-\tfrac{37}{17}


-\tfrac{1,517}{374}


\tfrac{1,517}{330}


\tfrac{41}{22}


\tfrac{24,272}{16,577}


\tfrac{1,517}{1,232}


\tfrac{1}{1}


\tfrac{1,517}{1,840}


\tfrac{37}{54}

Step1.00001.46171.23131.21291.2033
Δ Step1.15451.14841.07041.01521.0080
Speed1.00001.68752.46674.59705.57586.7091
Δ Speed1.00000.68750.77920.86360.97881.1333
-
AB 80E/F
-
550Nm[13]  · 2015
38
83
30
38
38
78
2
4

Gear
Ratio

-\tfrac{1,079}{285}


\tfrac{1,079}{225}


\tfrac{18,343}{6,525}


\tfrac{83}{45}


\tfrac{18,343}{12,833}


\tfrac{1,079}{889}


\tfrac{1}{1}


\tfrac{3,237}{3,959}


\tfrac{39}{58}

Step1.00001.52411.22301.2160
Δ Step1.18111.09571.0058
Speed1.00001.70592.60004.79565.86537.1319
Δ Speed1.00000.70590.89410.84441.06961.2667
TR-80SD
AE 80E/F
550Nm[14]  · 201038
82
30
38
38
74
2
4

Gear
Ratio

-\tfrac{1,599}{418}


\tfrac{533}{110}


\tfrac{41}{22}


\tfrac{9,061}{3,190}


\tfrac{533}{438}


\tfrac{1}{1}


\tfrac{1,599}{1,960}


\tfrac{39}{58}

Step1.00001.52411.22581.2133
Δ Step1.17511.09841.0103
Speed1.00001.70592.60004.84555.93947.2061
Δ Speed1.00000.70590.89410.86361.09391.2667
TR-81SD
-
600Nm[15]  · 2010
-
38
82
36
44
44
96
2
4

Gear
Ratio

-\tfrac{492}{121}


\tfrac{164}{33}


\tfrac{41}{22}


\tfrac{1,312}{913}


\tfrac{328}{271}


\tfrac{1}{1}


\tfrac{984}{1193}


\tfrac{24}{35}

Step1.00001.52381.21241.2028
Δ Step1.17501.09231.0079
Speed1.00001.75002.66674.96976.02537.2475
Δ Speed1.00000.75000.91670.86361.05561.2222
TR-82SD
-
850Nm[16]  · 2010
-
38
83
36
44
44
96
2
4

Gear
Ratio

-\tfrac{664}{165}


\tfrac{664}{135}


\tfrac{83}{45}


\tfrac{1,328}{929}


\tfrac{332}{275}


\tfrac{1}{1}


\tfrac{996}{1205}


\tfrac{24}{35}

Step1.00001.52381.20981.2054
Δ Step1.18101.08971.0037
Speed1.00001.75002.66674.91855.95067.1728
Δ Speed1.00000.75000.91670.84441.03211.2222
-
AL 80E/F
-
TBD · 2023
38
78
38
46
46
86
2
4

Gear
Ratio

-\tfrac{1,677}{460}


\tfrac{1,677}{380}


\tfrac{35,217}{12,540}


\tfrac{39}{20}


\tfrac{35,217}{23,304}


\tfrac{1,677}{1,316}


\tfrac{1}{1}


\tfrac{1,677}{2,114}


\tfrac{43}{66}

Step1.00001.57141.44021.26061.2176
Δ Step1.11611.08811.0353
Speed1.00001.57142.26324.41325.56326.7737
Δ Speed1.00000.57140.69170.95001.15001.2105
Transverse engines
AW F8 F35
UB 80E/F
300Nm · 201338
78
26
34
34
70
2
4

Gear
Ratio

-\tfrac{273}{68}


\tfrac{21}{4}


\tfrac{315}{104}


\tfrac{39}{20}


\tfrac{1,575}{1,081}


\tfrac{105}{86}


\tfrac{1}{1}


\tfrac{1,365}{1,688}


\tfrac{35}{52}

Step1.00001.55331.23661.2014
Δ Step1.16051.12151.0293
Speed1.00001.73332.69235.25006.49237.5833
Δ Speed1.00000.73330.95900.95001.24231.3077
AW F8 F45
UA 80E/F
430Nm · 201342
82
26
34
34
70
2
4

Gear
Ratio

-\tfrac{287}{68}


\tfrac{287}{52}


\tfrac{4,305}{1,352}


\tfrac{41}{20}


\tfrac{3,075}{2,061}


\tfrac{205}{166}


\tfrac{1}{1}


\tfrac{205}{256}


\tfrac{35}{52}

Step1.00001.37401.24881.1897
Δ Step1.13721.0496
Speed1.00001.73332.69233.69925.51926.89238.2000
Δ Speed1.00000.73330.95901.00691.05001.37311.3077
TG-80LS
UB 80E/F
350Nm · 201738
78
30
38
38
78
2
4

Gear
Ratio

-\tfrac{1,521}{380}


\tfrac{507}{100}


\tfrac{8,619}{2,900}


\tfrac{39}{20}


\tfrac{8,619}{5,864}


\tfrac{9,633}{7,828}


\tfrac{1}{1}


\tfrac{1,521}{1,882}


\tfrac{39}{58}

Step1.00001.52411.23731.2019
Δ Step1.14881.11081.0295
Speed1.00001.70592.60005.07006.27337.5400
Δ Speed1.00000.70590.89410.95001.20331.2667
TBDTBD · TBD38
78
36
44
44
96
2
4

Gear
Ratio

-\tfrac{234}{55}


\tfrac{26}{5}


\tfrac{104}{35}


\tfrac{39}{20}


\tfrac{416}{283}


\tfrac{104}{85}


\tfrac{1}{1}


\tfrac{936}{1,145}


\tfrac{24}{35}

Step1.00001.52381.22331.1921
Δ Step1.14861.10421.0261
Speed1.00001.75002.66675.2006.36117.5833
Δ Speed1.00000.75000.91670.95001.16111.2222
Ratio
R & Even

iR2=-\tfrac{R3}{S3}

\tfrac{R1R3(S2+R2)}{S2(R1-S1)(S3+R3)}

\tfrac{R1R3(S2+R2)}{S2R3(R1-S1)+R1R2R3-S1S2S3}

i6=\tfrac{1}{1}

i8=\tfrac{R3}{S3+R3}

Ratio
R & Odd

iR1=\tfrac{R1R3}{S3(S1-R1)}

i1=\tfrac{R1R2R3}{S2S3(R1-S1)}

i3=\tfrac{R1}{R1-S1}

\tfrac{R1R2R3}{R1R2R3-S1S2S3}

\tfrac{R1R3}{R1R3-S1S3}

Algebra And Actuated Shift Elements
Brake A
Brake B
Clutch C
Clutch D
Clutch E
Clutch F

UA 80E/F Failures And Problems

The UA 80E/F family of 8-speed transmissions has had some issues which led to class action lawsuits, a Customer Support Program and numerous technical service bulletins. Starting in 2017, some Highlander and Sienna customers starting complaining of harsh or delayed shifting, delayed acceleration, hesitation, jerking, unintended acceleration, lurching and excessive revving before upshifting.[17] [18]

Additional issues arose when 2017 and 2018 Highlander and Sienna customers experienced whining, master warning lights/check engine lights and transmission failures. This prompted Toyota to initiate a Customer Support Program (ZJC). This program covered certain 2017 and early 2018 built Highlanders and Sienna under specific VIN parameters and transmission build dates.[19] However, this issue has been problematic beyond the scope of the ZJC program. This is causing out of pocket costs for customers outside of the standard 6 yrs./60K mls. powertrain warranty.[20]

More whine or grind issues have been documented in 2021 Avalon, Camry and Highlanders equipped with the UA 80E/F transmission prompting T-SB-0008-21.[21]

Applications

Longitudinal Engines

8-speed automatic RWD transmission.

8-speed automatic AWD transmission.

Pairs with Toyota 2GR-FSE and 2GR-FKS V6 engines.

Aisin TL-80SN

Hongqi

Transverse Engines

Toyota (UA 80E/F)

Lexus (UA 80E/F)

Toyota & Lexus (UB 80E/F)

Toyota & Lexus (UB 81E/F)

BMW/MINI

Changan

Chery

Citroën

DS Automobiles

Exeed

Geely

GM

Jaguar

Land Rover

Lynk & Co

Mitsubishi

Opel/Vauxhall

Peugeot

Polestar

Škoda

Volkswagen/MAN

Volvo (TG-81SC/SD)

See also

Notes and References

  1. Web site: Toyota AA80E 8-Speed Automatic Transmission with Novel Powertrain Control System · For Longitudinal Engines Only . Masami Kondo · Yoshio Hasegawa · Yoji Takanami · Kenji Arai · Masaharu Tanaka · Masafumi Kinoshita (Toyota Motor Corp.) · Takeshi Ootsuki · Tetsuya Yamaguchi · Akira Fukatsu (Aisin AW Co., Ltd.) . SAE Technical Paper Series . 2007-01-13 . 2024-11-01.
  2. Web site: Automatic Transmission · US-Patent No. 8,453,818 B2 · For Transverse Engines Only . Masahi Kito · Masaaki Nishida · Tomoko Nishida · Hiroshi Kato · Norihiro Tokunaga . 2013-06-04 . 2024-11-01.
  3. Web site: Lexus LS 460: World Introduction . . 2009-02-13 . Arellano . Joel . 2006-01-08.
  4. Web site: Aisin AW Co . High Torque Capacity FWD 8-speed AT . live . https://web.archive.org/web/20180520124441/https://www.aisin-aw.co.jp/en/products/drivetrain/lineup/at.html . 2018-05-20 . 2018-05-19 . www.aisin-aw.co.jp . en.
  5. en . The World's First Transverse 8-Speed Automatic Transmission . Toshihiko Aoki . Hiroshi Kato . Naoki Kato . Morise Masaru . SAE International . 10.4271/2013-01-1274 . 2013-01-1274 . 2013-04-08.
  6. Web site: de . Der neue Insignia – im 8-Stufen Takt . The new Insignia – with 8-step beat . Opel AG . Geord Bednarek . www.opel-blog.com . 2016-12-02 . https://web.archive.org/web/20171015065437/http://www.opel-blog.com/2016/12/02/der-neue-insignia-im-8-stufen-takt/ . 2017-10-15 . 2017-12-29 . live.
  7. Web site: 8 Speed Auto (US) Transmission and Torque Capacity.
  8. Web site: 'The Year of More' for the 2017 Highlander with More Power, More Safety, and More Model Choices. 2016-09-27.
  9. dead. https://web.archive.org/web/20200408205322/https://www.youtube.com/watch?v=_K041o77Puk&gl=US&hl=en. 2020-04-08. YouTube, a Google company . YouTube.
  10. Web site: Benchmarking a 2018 Toyota Camry UB80E Eight-Speed Automatic Transmission . Andrew Moskalik · Mark Stuhldreher · John Kargul (US Environmental Protection Agency) . SAE International . 2020-04-14 . 2024-11-01.
  11. Web site: Lexus RC F Technical Specifications . 2023-03-03.
  12. Web site: Lexus GS F Technical Specifications . 2023-03-03.
  13. Web site: 2016 LX 570 Product Information . 2015. 2024-11-01.
  14. Web site: Gearbox Aisin TR-80SD. gearboxlist.com. 3 April 2024 . 2024-11-01.
  15. Web site: Gearbox Aisin TR-81SD. gearboxlist.com. 3 April 2024 . 2024-11-01.
  16. Web site: Gearbox Aisin TR-82SD. gearboxlist.com. 3 April 2024 . 2024-11-01.
  17. Web site: Toyota 8-Speed Transmission Problems Lead To Lawsuit . 2020-04-07.
  18. Web site: Morales v. Toyota Motor Sales, U.S.A., Inc. . 2020-10-14.
  19. Web site: Customer Support Program Bulletin (ZJC): Repair Coverage For UA80 Transmission On Certain 2017-2018 MY Sienna And Certain 2017-2018 MY Highlander Vehicles . 2019-04-18.
  20. Web site: Official 2017-2019 UA80 Transmission Whine Failure Thread . 2024-03-06.
  21. Web site: Whine or Grind Noise From the Transmission . 2021-02-09.
  22. Web site: 2022 IS Specifications . 2023-03-03.
  23. https://www.toyota.com/grgarage/grcorolla/
  24. Web site: Test Drive Geely Xingyue Coupe SUV Review. 2019-05-29.
  25. Web site: en-US . All-New 2017 Buick LaCrosse is Here TechLink . sandyblogs.com . 2018-08-02.
  26. en . Cadillac XT5 Initiates New Series of Cadillac Luxury Crossovers . Cadillac . media.cadillac.com . 12 . 2015-11-09 . No archive due to robots.txt . 2018-07-14 .
  27. Web site: Lynk & Co. Reveals 05 coupe-like crossover. 2019-12-10 .
  28. Web site: en . 2018 Volkswagen Tiguan: We Finally Sample the U.S. Version . Don Sherman . caranddriver.com . December 2016.
  29. Web site: 2022 Volkswagen Taos: What We Know So Far. 2021-04-21.
  30. Web site: en . 2015 Volvo S80 D4 Geartronic SE Lux review – Updated Swedish Exec Gets Greener . Chris Davies . carproductstested.com . 2014-09-05 . https://web.archive.org/web/20171107011308/http://carproductstested.com/cars/2015-volvo-s80-d4-geartronic-se-lux-review-updated-swedish-exec-gets-greener . 2017-11-07 . 2017-12-28 . live.
  31. Web site: en . Volvo V70 – model year 2014 . Volvo Car Corporation . www.media.volvocars.com . 2013-05-13 . https://web.archive.org/web/20131023120410/https://www.media.volvocars.com/global/en-gb/models/v70/2014 . 2013-10-23 . 2017-12-28 . dead.
  32. Web site: en . Volvo's 2017 S90 has standard semi-autonomous driving system . SAE International . Paul Weissler . articles.sae.org . 2016-01-16 . https://web.archive.org/web/20171017164536/http://articles.sae.org/14568/ . 2017-10-17 . 2017-12-29 . live.
  33. Web site: en . 2019 XC40 spearheads Volvo's new CMA platform . SAE International . Gary Witzenburg . 2018-01-08 . 2018-06-08 . live. https://web.archive.org/web/20180612143049/https://www.sae.org/news/2018/01/2019-xc40-spearheads-volvos-new-cma-platform . 2018-06-12 .
  34. Web site: nl . Volvo V60 prijslijst Modeljaar 2019 . Volvo V60 price list model year 2019 . Volvo Cars Netherlands . volvo-tools-prd-media.s3.amazonaws.com . 18–19 . July 2018 . File valid from 12 November 2018 . 2018-07-14 . live. https://web.archive.org/web/20211016025913/https://volvo-tools-prd-media.s3.amazonaws.com/pricelists/documents/d80a75c9-20181112-De_nieuwe_Volvo_V60.pdf . 2021-10-16 .