The motor rotating shaft is horizontal, the drive pinion spin axis is also horizontal. The trouble is that these axes aren’t aligned, they are parallel to one another. The Cardan Shaft redirects the drive shaft to the drive pinion without changing the course of rotation.
Trusted in industry, cardan shafts have verified practical upon applications where space is limited-as well because in situations where an element in the machine train (e.g. paper roll) might need to always be actuated (dynamically positioned) to another position when the devices are not running. The universal joint permits limited movement without uncoupling. To ensure adequate lubrication circulation, which in turn stops the universal joints from seizing, cardan shafts are normally Cardan Shaft china installed with an position from 4 to 6 6 degrees at the universal joints. Experience, though, has shown that the position between the shafts of the driver and driven unit should be kept to the very least, preferably less than 4.36 mrads (0.25 degrees). Ideally, the angles between the driver and influenced shafts and the cardan shaft, demonstrated as β1 and β2 in Fig. 1, will be equal. Geometrically, this might equate to zero angularity existing between your driver and driven unit: Basically, the shafts of the driver 
and driven machine will be parallel to each other.
Usually it involves a tubular shaft, two sets of Universal Joints and glove system – ferrule stepper, among others. It is a element of the transmission program, its function is definitely to redirect the engine turning motion, after passing through the gearbox and the drive to the wheel, going right through the ‘planetary and satellite’ system etc.
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Cardan shaft, often known as cardinal shaft, is an element of torque transmission.