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Constant velocity universal joint is a device that connects two shafts with included angle or mutual position change between shafts, and enables the two shafts to transmit power at the same angular speed. It can overcome the problem of unequal velocity of ordinary cross shaft universal joint. At present, the widely used constant velocity universal joints mainly include ball fork universal joint and ball cage universal joint.
In the steering drive axle, the front wheel is both the driving wheel and the steering wheel. When turning, the deflection angle is large, up to more than 40 °. At this time, the traditional ordinary universal joint with small deflection angle cannot be used. When the deflection angle of ordinary universal joint is large, the speed and torque will fluctuate greatly. It is difficult for the power of automobile engine to be transmitted to the wheels smoothly and reliably. At the same time, it will also cause automobile vibration, impact and noise. Therefore, the constant velocity universal joint with large deflection angle, stable power transmission and uniform angular velocity must be used to meet the requirements.