When a little amount of flexibility or an angular moment is required, a mechanical union is known as a knuckle joint. It is utilized to unite two rods that are subject to a tensile load. There is always an axial or linear load path.
The following are the main parts of the knuckle joint assembly:
- only one eye.
- Two eyes or a fork
- Knock-out pin.
A single eye forms at one end of the rod, while a double eye forms at the other end. A pin put through the eye connects both single and double eyes. The pin features a head on one end and a split or taper pin on the other. The ends of the rod are in the shape of octagons for grasping purposes. The pin now keeps the two eyeballs together when they are being pulled apart. In this instance, the joint’s solid rod component is far more robust than the area through which the pin goes. For instance Trolley and a tractor. With the use of a knuckle joint, the trolley is fastened to the tractor.