Application and characteristics of cardan joint

Application and characteristics of cardan joint:

universal joint is a coupling of two angle it is a positive mechanical connection between rotating shaft,they are usually not parallel but intersecting to it.This used for transmit motion ,powder or both.

Application of universal joint:

universal joints include aircraft, appliances, control mechanisms,electronIcs, Instrumentation, medical and optical devices, ordnance, radio, sewing machines, textile machInery and tool
drives.
Universal joints are available in steel or in thermoplastic body members.Universal joints with thermoplastic body members are used in light industrial applications in which their self-lubricating feature.
Universal joints of special construction, such as ball-jointed universals are also available.These are used for high-speed operation and for carrying large torques.

Characteristics of the Cardan Joint:

A basic characteristic of the Cardan joint is the nonuniformity of
motion transmission through the joint.The angular-velocity ratio
between input and out put shafts varies cyclically at two cycles
per revolution of the input shaft.Operating angle can be as
much as 15% of peak angular velocity (in the case of a 30° operating angle).

Double cardan joint:

A double Cardan joint consists of two universal joints mounted back to back with a center yoke. 
The center yoke replaces the intermediate shaft. Provided that the angle between the input 
shaft and center yoke is equal to the angle between the center yoke and the output shaft, the
second Cardan joint will cancel the velocity errors introduced by the first Cardan joint and the aligned double Cardan joint will act as a CV joint

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