The electric motor rotating shaft is horizontal, the travel pinion spin axis is also horizontal. The difficulty is that these axes are not aligned, they happen to be parallel to one another. The Cardan Shaft redirects the travel shaft to the drive pinion without changing the path of rotation.
Widely used in industry, cardan shafts have confirmed practical upon applications where space is limited-as well as in conditions where an element in the device train (e.g. paper roll) might need to always be actuated (dynamically positioned) to an alternate position when the machines are not operating. The universal joint allows for limited movements without uncoupling. To make sure ample lubrication circulation, which prevents the universal joints from seizing, cardan shafts are normally installed with an position from 4 to 6 6 degrees at the universal joints. Experience, though, has proven that the position between the shafts of the driver and powered unit should be kept to the very least, preferably less than 4.36 mrads (0.25 degrees). Preferably, the angles between your driver and powered shafts and the cardan shaft, shown as β1 and β2 in Fig. 1, would be equal. Geometrically, this would equate to zero angularity existing between your driver and driven unit: Quite simply, 
the shafts of the driver and powered machine will be parallel to one another.
Usually it contains a tubular shaft, two sets of Universal Joints and glove system – ferrule stepper, amongst others. It is a element of the transmission system, its function can be to Cardan Shaft china redirect the engine turning activity, after moving through the gearbox and the travel to the wheel, going through the ‘planetary and satellite’ system etc.
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Cardan shaft, often known as cardinal shaft, is a component of torque transmission.