The universal coupling consists of inner and outer bearings, where the inner bearing is installed on the drive shaft and the outer bearing is used on the driven shaft. When working, it can place the two axes at different angles or positions and keep both axes moving in the same plane. The basic working principle of this kind of machine is that the internal bearing and the external bearing are connected through some "transfer tools", which can be partially cylindrical wheels or spherical wheels. Whenever the drive shaft rotates, the transfer tool transfers the rotation to the external bearing, which drives the driven shaft into continuous motion. In addition, the design of the universal coupling also allows the transmission of torque and motion even if the two shafts are misaligned.
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