The car differential enables the left and right (or front and rear) driving wheels to rotate at different speeds. It is mainly composed of left and right half shaft gear, two planetary gear and gear frame. Function is when the car turns or drives on the uneven road surface, so that the left and right wheels roll at different speeds, that is to ensure that both sides of the driving wheel for pure rolling motion. The differential is designed to adjust the speed difference between the left and right wheels. In four-wheel drive, in order to drive four wheels, all wheels must be connected. If the four wheels are mechanically connected together, the car cannot rotate at the same speed when it is driving on the curve. In order to make the rotation speed of the car be basically consistent when driving on the curve, the intermediate differential is needed to adjust the speed difference between the front and rear wheels.
