The gearbox mainly refers to the gearbox of a car.

It is divided into two types: manual and automatic. A manual gearbox is mainly composed of gears and shafts, which generate variable speed and torque through different gear combinations; The automatic transmission AT is composed of a hydraulic torque converter, planetary gears, and a hydraulic control system, which achieves variable speed torque through hydraulic transmission and gear combination.

The functions are:

1、 Change the transmission ratio;

2、 Enable the car to move in reverse while the direction of engine rotation remains unchanged;

3、 Using neutral gear to interrupt power transmission, enabling the engine to start, idle, and facilitate transmission shifting or power output.

The automotive transmission has several functions:

Change the transmission ratio, expand the range of changes in driving wheel torque and speed to adapt to frequently changing driving conditions, and at the same time, enable the engine to operate under favorable conditions (higher power and lower fuel consumption);

Enable the car to move in reverse while the direction of engine rotation remains unchanged;

Using neutral gear to interrupt power transmission, allowing the engine to start, change gears, and facilitate transmission shifting or power output.

The transmission is composed of a variable speed transmission mechanism and a control mechanism, and a power output can be added when needed. There are two ways to classify: according to the change in transmission ratio and according to the different operating methods

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