ABOUT COTTER JOINT, IT'S COMPONENTS AND EXAMPLES

What is a cotter joint? 

A cotter joint (socket and spigot joint) which is used to connect rigidly two co-axial rods,

transmits the force and motion along the axial direction without rotation. The rods are subjected

to either axial tensile or compressive forces.

• Examples (applications) of cotter joint :

1. The joint between the piston rod and crosshead of a steam engine,
2. The joint between the piston rod and its steam,
3. A steam engine connecting rod strap end, and
4. Foundation bolt.

• Components of cotter joint :

A cotter joint, consists of three components:

1. Socket
2. Spigot, and
3. Cotter

• The end of one rod (A) is formed into a socket. The end of the other rods (B) which is formed into the spigot is inserted into the socket. A rectangular slot is made in the socket and spigot with a taper on one side and cotter is then driven tightly through a slot.

• A cotter is a flat wedge shaped piece of retangular cross-section usually made of steel with its width tapered on onr side to match the taper in slots. The taper varies from 1 in 48 to 1 in 24 and it may be increased to 1in 8 if locking is provided. The slots are made slightly wider than the cotter. The clearances between the cotter and slots in the socket and spigot allow the driven cotter to draw together the two parts of the joint.

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