Class Room

Keys A key can be defined as a machine element which is used to connect the transmission shaft to rotating machine elements like pulleys, gears, sprockets or flywheels. A keyed joint consisting of shaft, hub and key.    There are two basic functions of the key. i)                  The primary function of the key is to transmit the torque from the shaft to the hub of the mating element and vice versa. ii)                 The second function of the key is to prevent relative rotational motion between the shaft and the joined machine element like gear or pulley. In most of the cases, the key also prevents axial motion between two elements, except in case of feather key or splined connection. There are different ways to classify key the keys. Some of them are as follow: ·         Saddle key and sunk key ·         Square key and flat key ·         Taper key and parallel key ·         Key with and without Gib-head   The selection of the type of key for a given