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What does 8AT mean in cars?

1 Answers

StSteven

07/28/25 6:31pm

It refers to an automatic transmission with 8 forward gears. AT stands for Automatic Transmission, also known as automatic gearbox. Automatic transmissions offer advantages such as easy operation, comfortable driving, and reduced driver fatigue. An automatic transmission consists of a torque converter, planetary gear transmission, and control mechanism. Here are some relevant details: 1. The automatic transmission can automatically adjust speed and torque based on road conditions, allowing drivers to focus entirely on road traffic without being distracted by gear shifting. 2. Principle: The impeller and turbine form a working pair, similar to two fans placed opposite each other. The airflow from one fan drives the blades of the other fan, with the airflow acting as the medium for kinetic energy transfer. If liquid is used instead of air as the medium for kinetic energy transfer, the impeller will drive the turbine to rotate through the liquid, with a guide wheel added between the impeller and turbine. 3. By utilizing the reaction force to create a speed difference between the impeller and turbine, speed and torque can be adjusted. Since the torque converter's automatic speed and torque adjustment range is not sufficiently wide, several rows of planetary gears are connected in series behind the turbine to improve efficiency. The hydraulic control system automatically operates the planetary gears in response to changes in engine operation, thereby achieving automatic speed and torque adjustment.

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