Differential can make the left and right (or front and rear) drive wheels to realize the mechanism of rotation at different speeds. It is mainly composed of the left and right half shaft gears, two planetary gears and gear racks. The function is to make the left and right wheels roll at different speeds when the car is turning or traveling on uneven road surface, i.e., to ensure that the two sides of the driving wheels for pure rolling motion. The differential is installed to adjust the speed difference between the left and right wheels. In four-wheel drive, in order to drive four wheels, must be connected to all the wheels, if the four wheels are mechanically connected together, the car can not be the same speed rotation in a curve, in order to make the car curve driving rotational speed is basically the same, this time it is necessary to join the intermediate differential used to adjust the front and rear wheels of the speed difference.
1. The differential case should not have any cracks of any nature, and the contact between the case and the planetary gear spacer and the differential half-shaft gear should be smooth without grooves; if there are slight grooves or abrasion, it can be repaired and ground to continue to use, otherwise it should be replaced or repaired.
2. The clearance between the planetary gear shaft hole and the planetary gear shaft on the differential case shall not be more than 0.1-0.15mm, and the half-shaft gear journal and the shell hole shall be a clearance fit, and there shall be no obvious feeling of looseness, otherwise it shall be replaced or repaired.