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The automobile differential az9231320271 can make the left and right (or front and rear) driving wheels realize the mechanism that rotates at different speeds. It is mainly composed of left and right half shaft gears, two planetary gears and a gear carrier. The function is to make the left and right wheels roll at different speeds when the car is turning or driving on uneven roads, that is, to ensure the pure rolling motion of the driving wheels on both sides. The differential is installed to adjust the difference in the rotational speed of the left and right wheels. In four-wheel drive, in order to drive the four wheels, all the wheels must be connected. If the four wheels are mechanically connected, the car cannot rotate at the same speed when driving in a curve, in order to allow the car to travel in a curve. The rotation speed is basically the same. At this time, a middle differential needs to be added to adjust the speed difference between the front and rear wheels.