In automobile transmission systems and other systems, in order to achieve power transmission between some rotating shafts whose axes intersect or whose relative positions change frequently, universal transmissions must be adopted. The universal transmission device is generally composed of a universal joint and a drive shaft, and sometimes there is an intermediate support. The universal joint for truck is one of many universal joints.
The structure and function of universal joints are a bit like joints on human limbs, which allow the angle between connected parts to vary within a certain range. In order to meet the power transmission, adapt to the angle change caused by the up and down jumps generated by the steering and the running of the car, the drive axle of the front-drive car, the half shaft, and the wheel axle are commonly connected by universal joints. However, due to the limitation of the axial size, the required deflection angle is relatively large. A single universal joint cannot make the instantaneous angular velocities of the output shaft and the shaft input shaft equal, which will easily cause vibration, aggravate component damage, and generate a lot of noise. Therefore, various constant velocity joints are widely used.
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