How About ZF 9AT Gearbox?

The ZF 9AT gearbox is an excellent gearbox with two great value features: fuel economy and fast acceleration. The core structure of the 9AT gearbox consists of 4 sets of planetary gears and 6 shifting elements. Compared with the 8HP, there is one more shifting element. Therefore, in the case of multiple gears, the gear gap between each gear is reduced. The reduction ratio range is wider, which can achieve reduced fuel consumption and strong acceleration at low speeds at high speeds.
 
However, due to the increase in gears, the number of internal components has also increased, which will lead to more problem points for failure. In addition, compressing the component volume to fit the housing size results in less torque that can be tolerated. In addition, the working principle of the 9AT gearbox is different from other gearboxes. It is composed of a gearbox, an electronically controlled clutch, an automatic shift control mechanism and an electronic control part. The electronically controlled clutch can automatically separate, engage or "hang" the clutch as needed. During operation, the transmission ECU controls the stepper motor to push the clutch fork to separate or engage the clutch. The function of the automatic shift control mechanism is to automatically shift into the corresponding gear as needed. Generally, two stepper motors are provided, both of which are controlled by the transmission ECU.
 
When parking, the clutch is disengaged, so if you park on a slope, you must apply the brakes, otherwise the car will roll away. If you use manual mode, driving feels like driving a manual transmission car. The power comes very directly. There is no need to increase and decrease gears one gear after another. You can jump up and down gears. In short, the ZF 9AT gearbox is a very excellent gearbox, with the advantages of fuel economy and fast acceleration, but it also has some fault problems and the disadvantage of less torque it can withstand.