Gear transmission is one of the widely used drives in automobiles, and it mainly has the following functions:

1, speed change: through two different sizes of gear mesh, you can change the speed of the gear. For example, the transmission gear can reduce or increase the speed of the engine to meet the needs of the car;

2, torque change: two different sizes of gear mesh, changing the speed of the gear at the same time, but also changing the transmitted torque. For example, the car gearbox, the main reducer in the drive axle, can change the torque of the car;

3, change direction: the direction of power action of some car engines is perpendicular to the direction of the car, and the direction of power transmission must be changed to drive the car. This device is usually the main reducer and differential of the car