How half shaft gears, planetary gears, planetary gear shafts and differential housings work


The differential is designed to allow the two halves to […]

The differential is designed to allow the two halves to rotate at different speeds during the steering of the car to meet the needs of the two drive wheels for unequal travel, so that the car can travel straight and lightly.

At present, domestically produced automobiles basically adopt a differential composed of a planetary gear, a half shaft gear, a planetary gear shaft (cross shaft or a direct shaft), and a differential case.

The two halves of the differential case are fastened together by bolts, and the driven gear of the final drive is bolted to the flange of the differential case, and the cross-shaped planetary gear shaft is mounted at the joint surface of the differential case. In the circular hole, each journal has a straight-toothed conical planetary gear with a sliding bearing, and the left and right sides of the four planetary gears mesh with a straight-toothed conical half-shaft gear. The journal of the side gear is supported in a corresponding hole in the left and right sides of the differential case, and the inner spline is connected to the half shaft.


In cars of medium and small size, since the torque to drive the wheels is not large, two planetary gears are used in the differential. The corresponding planetary gear shaft phase is a direct selling shaft, and the differential case can be made into a monolithic case with a large window hole, and the operation of disassembling the planetary gear and the side gear can be performed through the large window hole.

The axle housing supports and protects the final drive, the half shaft of the differential, etc., so that the axial relative position of the drive is fixed. It bears the weight of the car together with the driven bridge and withstands various reaction forces and moments transmitted from the wheels.

The drive axle housing is generally composed of a final drive housing and a semi-axle bushing, and is internally used for mounting a final drive, a differential, a half shaft, etc.; the outside is connected to the frame through a suspension, and the brake base plate is mounted at both ends and Connect the wheels to withstand the forces and moments from the suspension and wheels.