Its all about UNIVERSAL JOINT

1. Introduction to Universal Joint:
Universal joint is a positive mechanical joint used for connecting shafts, whose axes are inclined at
an angle to each other. It is also known as universal coupling, U-joint, Cardan Joint and Hooke’s
Joint. It compensates angular misalignment between the shafts in any direction.
Generally, in order to use universal joint, the inclination between the shafts should be less than 30°.
Parts of a Universal Joint:
You can understand the parts of a universal coupling clearly by taking a look at the exploded view
shown below. To know more about the parts.

2. Exploded view of a Universal Joint
The two fork ends are assembled co-axially with respect to the centre block. The pins are assembled
into the holes provided in the fork end. They are held in position by means of a collar and a collar
pin. The assembled view of a universal joint is shown below. For a detailed understanding of the
assembly of a typical universal joint, refer this article.

3. Assembled View
Advantages of Universal Joint:
1. Universal coupling is more flexible than knuckle joint.
2. It facilitates torque transmission between shafts which have angular misalignment.
3. It is cheap and cost effective.
4. It is simple to be assembled and dismantled.
5. Torque transmission efficiency is high.
6. The joint permits angular displacements.
Disadvantages of Universal Joint:
1. Wear may occur if the joint is not properly lubricated.
2. Maintenance is often necessary to avoid wear.
3. Universal joint produces fluctuating motion.
4. It does not support axial misalignment.

4. Applications of Universal Joint:
Universal joint has a wide range of applications. It is used in:
1. Driveshafts
2. Automobile propeller shafts
3. Stone crushers
4. Tapping machinery
5. Centrifugal blowers
6. Centrifugal fans and centrifugal pumps
7. Belt conveyors
8. Control mechanisms
9. Marine equipments
10. Metal forming machinery
11. Sockets