First of all, the mainstream of gearbox can be divided into three categories. The first category is CVT, the second category is dual clutch, and the third category is AT gearbox. Toyota mainly has CVT and AT gearboxes, and there is no dual clutch.
Toyota overbearing and Highlander match AT gearbox because AT gearbox can bear more torque. For example, Toyota overbearing and Highlander SUV have very high requirements for the torque that the gearbox can withstand. CVT gearbox is characterized by stepless speed change, but it can't bear large torque, so Toyota's small car. A hatchback or sedan usually matches a Cvt gearbox. If CVT gearbox matches this Toyota overbearing and Highlander medium and large SUV, it is easy to slip, and even the internal structure drive belt of CV T gearbox is broken.
Aisin 6AT gearbox is characterized by smooth power transmission, high engine torque output and low failure rate. After a long-term market test, Toyota Highlander and Toyota overbearing market feedback are relatively stable and qualified. At this point, Toyota overbearing had to raise prices for sales. The transmission structure of At gearbox is very different from CVT, because it belongs to gear transmission. Different from the belt drive of CVT, AT gearbox will not slip, and the power transmission efficiency is relatively high and reliable. Aisin's latest AT gearbox has 8AT, but Toyota is worried about the stability of product quality. At present, the latest 8AT gearbox is not used, and 6AT gearbox is still selected.
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