MUFF OR SLEEVE COUPLING

WHAT IS MUFF COUPLING? 

• A muff or coupling is the simplest type of rigid coupling used to connect two shafts rigidly.
• It consists of a sleeve or a hollow cylinder, generally made of cast iron, fitted over the ends of the shafts to be connected and keyed by means of a sunk key. The power is transmitted from one shaft to another shaft through the key and sleeve.

• Advantages of muff coupling:

1. It has no projecting parts.
2. It is simple in construction

• Though the coupling is simple, it requires very careful fitting. If the depth of keyway is not exactly same in each shaft, then the key will be loose in one shaft and bedded on other shaft. In order to prevent this, many a times, the key is made in two lengths.