The engine rotating shaft is horizontal, the travel pinion spin axis can be horizontal. The issue is these axes aren’t aligned, they will be parallel to one another. The Cardan Shaft redirects the travel shaft to the drive pinion without changing the direction of rotation.
Trusted in industry, cardan shafts have proven practical about applications where space is limited-as well while in situations where an component in the device train (e.g. paper roll) may need to become actuated (dynamically positioned) to an alternate position when the devices are not jogging. The universal joint allows for limited activity without uncoupling. To ensure ample lubrication circulation, which in turn avoids the universal joints from seizing, cardan shafts are normally installed with an angle from 4 to 6 6 Cardan Shaft china degrees at the universal joints. Encounter, though, has demonstrated that the position between your shafts of the driver and driven unit should be kept to a minimum, preferably significantly less than 4.36 mrads (0.25 degrees). Ideally, the angles between your driver and powered shafts and the cardan shaft, proven as β1 and β2 in Fig. 1, would be equal. Geometrically, this would mean zero angularity existing between your driver and driven device: In other words, the shafts of the driver and driven machine would be parallel to each other.
Usually it contains a tubular shaft, two sets of Universal Joints and glove system – ferrule stepper, among others. It can be a component of the transmission program, its 
function is definitely to redirect the engine turning movements, after moving through the gearbox and the travel 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.