The motor rotating shaft is horizontal, the travel pinion spin axis is also horizontal. The problem is that these axes are not aligned, they will be parallel to 
one another. The Cardan Shaft redirects the travel shaft to the drive pinion Cardan Shaft china without changing the course of rotation.
Trusted in industry, cardan shafts have proven practical on applications where space is limited-as well as in conditions where an component in the device train (e.g. paper roll) might need to become actuated (dynamically positioned) to another position when the equipment are not operating. The universal joint permits limited movement without uncoupling. To ensure adequate lubrication circulation, which prevents the universal joints from seizing, cardan shafts are usually installed with an position from 4 to 6 6 degrees at the universal joints. Experience, though, has proven that the angle between the shafts of the driver and driven unit ought to be kept to the very least, preferably less than 4.36 mrads (0.25 degrees). Preferably, the angles between the driver and influenced shafts and the cardan shaft, demonstrated as β1 and β2 in Fig. 1, would be equal. Geometrically, this would equate to zero angularity existing between the driver and driven device: Quite simply, the shafts of the driver and motivated machine will be parallel to each other.
Usually it consists of a tubular shaft, two sets of Universal Joints and glove system – ferrule stepper, among others. It is certainly a component of the transmission program, its function is usually to redirect the engine turning activity, after moving through the gearbox and the drive to the wheel, going right through the ‘planetary and satellite’ system etc.
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Cardan shaft, also referred to as cardinal shaft, is an element of torque transmission.