The Aisin AW F8FXX series is the world's first 8-speed automatic transmission designed for use in transverse engine applications.
Aisin designed the transmission to package in the same space as preceding 6-speed designs, while increasing the total gear spread and reducing gear spacing. It is also called the EAT8 (PSA), GA8F22AW (BMW & Mini), TG-81SC (Volvo), AF50-8 (Opel/Vauxhall), AWF8F45 (Cadillac), and AQ450 (Volkswagen Group). First usage was in the 2013 model year Lexus RX350 F Sport.
AWF8F35/45 | |
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Overview | |
Manufacturer | Aisin AW |
Also called | BMW & Mini GA8F22AW Toyota UA80E/UA80F Volvo TG-81SC/SD GM AWF8F45 & AF50-8 VW AQ450 PSA EAT8 |
Production | 2013–present |
Body and chassis | |
Class | 8-speed transverse automatic transmission |
Related | ZF 8HP · ZF 9HP |
Chronology | |
Predecessor | AWTF-80 SC transmission |
Gearset 1 is not an ordinary gearset but a reverse one. It employs two planetary gears which mesh with each other. One of these planets meshes with the sun gear, the other planet meshes with the ring gear. This results in different ratios being generated by the planetary and also causes the sun gear to rotate in the same direction as the ring gear when the planet carrier is the stationary.
This made it possible to manage with three wheel sets. As a result, the transmission is more compact than eight-speed transmissions for conventional drives. This meant that an eight-speed automatic transmission was also possible for transverse engines. The same gearset concept was first used by Lexus in 2007 and was the very first eight-speed automatic transmission for passenger cars on the world market.
Gear Teeth and Ratios | Planetary Gearset: Teeth | Count | Total | Avg. | Drive- train | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Simple | Ravigneaux | ||||||||||
Model Type | First Delivery Max. Input Torque | | | | Brakes Clutches | Ratio Span | Gear Step | Final Drive | |||
Gear | R1 | R2 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
Step | –R1 : 1 | –R2 : 2 | 1 : 2 | 2 : 3 | 3 : 4 | 4 : 5 | 5 : 6 | 6 : 7 | 7 : 8 | ||
AA 80E Lexus | 480 N⋅m (354 lb⋅ft) · 2007 | 38 82 | 30 34 | 34 74 | 2 4 | 6.7091 | 1.3125 | ||||
Ratio | −4.0561 | −2.1765 | 4.5970 | 2.7241 | 1.8636 | 1.4642 | 1.2313 | 1.0000 | 0.8245 | 0.6852 | |
Step | 0.8824 | 0.7990 | 1.6875 | 1.4617 | 1.2728 | 1.1891 | 1.2313 | 1.2129 | 1.2033 | ||
AA 80E | 38 83 | 30 38 | 38 78 | 2 4 | 7.1252 | 1.3240 | |||||
Ratio | −3.7860 | −2.0526 | 4.7956 | 2.8112 | 1.8444 | 1.4294 | 1.2137 | 1.0000 | 0.8176 | 0.6724 | |
Step | 0.7895 | 0.7302 | 1.7059 | 1.5241 | 1.2904 | 1.1777 | 1.2137 | 1.2230 | 1.2160 | ||
AW F8F35 AW F8F45 | 350 N⋅m (258 lb⋅ft) · 2013 480 N⋅m (354 lb⋅ft) · 2013 | 38 78 | 36 44 | 44 96 | 2 4 | 7.5833 | 1.3357 | ||||
Ratio | −4.2545 | −2.1818 | 5.2000 | 2.9714 | 1.9500 | 1.4700 | 1.2235 | 1.0000 | 0.8175 | 0.6857 | 4.398 |
Step | 0.8181 | 0.7343 | 1.7500 | 1.5238 | 1.3266 | 1.2014 | 1.2235 | 1.2233 | 1.1921 | ||
AW F8F45 | 480 N⋅m (354 lb⋅ft) 2013 | 38 78 | 26 34 | 34 70 | 2 4 | 7.8000 | 1.3410 | ||||
Ratio | −4.0147 | −2.0588 | 5.2500 | 3.0288 | 1.9500 | 1.4570 | 1.2209 | 1.0000 | 0.8086 | 0.6731 | 3.075 3.200 |
Step | 0.7647 | 0.6797 | 1.7333 | 1.5533 | 1.3384 | 1.1933 | 1.2209 | 1.2366 | 1.2014 | ||
AW F8F35 | 350 N⋅m (258 lb⋅ft) 2013 | 42 82 | 26 34 | 34 70 | 2 4 | 8.2000 | 1.3507 | ||||
Ratio | −4.2206 | −2.0588 | 5.5192 | 3.1842 | 2.0500 | 1.4920 | 1.2349 | 1.0000 | 0.8008 | 0.6731 | 2.561 |
Step | 0.7647 | 0.6466 | 1.7333 | 1.5533 | 1.3740 | 1.2082 | 1.2349 | 1.2488 | 1.1897 | ||
Ratio R & even | |||||||||||
Ratio R & odd |
BMW/MINI
Changan
Chery
Citroën
DS Automobiles
Exeed
Geely
GM
Jaguar
Land Rover
Lexus
Lynk & Co
Mitsubishi
Opel/Vauxhall
Peugeot
Polestar
Škoda
Toyota (as UA8xx)
Volkswagen/MAN
Volvo (TG-81SC/SD)
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