The Aisin AW TF-8# SC series is a 6-speed automatic transmission designed for use in

transverse engine A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. Many modern front-wheel drive vehicles use this arrangement. Most rear-wheel drive vehicles use a longitudinal ...

applications produced by

Aisin Seiki is a Japanese corporation that develops and produces components and systems for the automotive industry. Aisin is a Fortune Global 500 company, ranked 359 rankings. Aisin is a member of the Toyota Group of companies. Aisin was founded in 1965 ...

. It is built in

Anjō is a Cities of Japan, city in Aichi Prefecture, Japan. , the city had an estimated population of 188,693 in 76,087 households, and a population density of 2,193 persons per km². The total area of the city was . Geography Anjō is situated in ...

, 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. It uses a Lepelletier gear mechanism, an epicyclic/planetary gearset, which can provide more gear ratios with significantly fewer components. This means the Aisin AW TF-8# SC series is actually lighter than its five-speed predecessors. 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

installation.

Specifications

Basic concept

A conventional 5-pinion planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism, to reduce both the size and weight. It was first realized in 2000 with the 6HP from

ZF Friedrichshafen ZF Friedrichshafen AG, also known as ZF Group, originally ''Zahnradfabrik Friedrichshafen'' (), and commonly abbreviated to ZF, is a Germany, German technology manufacturing company that supplies systems for passenger cars, commercial vehicles ...

. Like all transmissions realized with Lepelletier transmissions, 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 also has the capability to achieve

torque converter A torque converter is a device, usually implemented as a type of fluid coupling, that transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load. In a vehicle with an automatic transmission, the ...

lock-up on all 6 forward gears, and disengage it completely when at a standstill, significantly closing the

fuel efficiency Fuel efficiency (or fuel economy) is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical energy, chemical potential energy contained in a carrier (fuel) into kinetic energy or Mechanical work, w ...

gap between automatic and

manual transmission A manual transmission (MT), also known as manual gearbox, standard transmission (in Canadian English, Canada, British English, the United Kingdom and American English, the United States), or stick shift (in the United States), is a multi-speed ...

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.

Applications

References

{{Reflist

External links

Block Reference (SimDriveline Version 1)

Alto Products Corp.

Driving innovation
Wayback Machine AWTF-80 SC