New 8-speed And 10-speed Automatic Transmissions (Direct Shift ...

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Dec. 06, 2016

New 8-speed and 10-speed Automatic Transmissions (Direct Shift-8AT & Direct Shift-10AT) Dec. 06, 2016

New 8-speed and 10-speed Automatic Transmissions (Direct Shift-8AT & Direct Shift-10AT)

Feature

Toyota has developed two new automatic transmissions―the 8-speed Direct Shift-8AT and the 10-speed Direct shift-10AT. For both, various measures were taken to minimize energy loss and heighten transmission efficiency. Gear tooth surfaces were processed using a new technique for a lower coefficient of friction when the gears engage, and the configuration of the friction material used inside the clutch was optimized to reduce clutch torque loss by approximately 50 percent during rotation (compared to a conventional 6-speed transmission). These and other efforts resulted in achieving one of the world's best transmission efficiencies*. The new automatic transmissions are more compact and lighter than comparative conventional transmissions, lowering a vehicle's fuel requirements. And their lower center of gravity results in both improved straight-driving stability and better cornering stability.

Furthermore, widened gears and a newly developed high-performance compact torque convertor combine for a broader gear lockup range. The resulting quick and smooth response to accelerator pedal operation creates an "as desired" direct driving feel.

In the case of the Direct Shift-10AT, even though the number of gears has been increased to 10 (compared to eight gears in the case of the Direct Shift-8AT), the use of close-ratio gears optimizes the range of use of each gear, particularly in the low-to-mid speed range. The resulting smooth gear changes, which are among the world's quickest*, create a rhythmical and comfortable sensation that is suitable for a premium rear-wheel-drive vehicle.

As of November 2016, according to Toyota survey

New FF 8-speed Automatic Transmission

Top-level transmission efficiency contributes to higher fuel economy, compactness, lightweight, low center of gravity contributes to driving performance
Lock-up range of the new 8-speed gear train is widened to realize direct response driving

About the details of Performance / Details of the new technologies

New FR 10-speed Automatic Transmission

In addition to its high basic performance which is common with the Direct Shift-8AT, an exhilarating driving performance for FR premium car is pursued
Adopting a close-ratio transmission, and its world-class top gear change speed helps to ensure smooth driving
Directly responding to the driver's accelerator operation

About the details of Performance / Details of the new technologies