The working principle of differential is that the moving gear (bevel gear) drives the differential housing to rotate. Reflected in the following four points:

1, power input of differential, driven gear bevel gear drives differential housing to rotate;

2, the output of the differential, two axle gears connect the transmission shafts on both sides, also called half shafts, to power the wheels on both sides;

3. The rotation of planetary gears refers to the rotation of planetary gears around planetary gear shafts;

4. The revolution of planetary gears refers to the rotation of planetary gears around the axis of half-shaft gears.

The differential makes the left and right wheels roll at different speeds when the car turns or runs on uneven roads, which ensures the pure rolling motion of bilateral driving rotation. The power of the engine enters the differential through the transmission shaft to directly drive the planet carrier, and then the planet wheel drives the left and right half shafts to drive the left and right wheels respectively.

Design requirements of differential:

Ordinary differential is composed of planetary gear, planetary carrier (differential case), half shaft gear and other parts. When designing, it is required that the rotational speed of the left half shaft plus the rotational speed of the right half shaft is equal to the rotational speed of the planet carrier. When the car goes straight, the left and right wheels and the planet carrier rotate at the same speed and are in a state of balance.