Chains and their Types...

Chains and their Types A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links. Chains can be classified in many different ways. From a theoretical viewpoint, a chain is a continuous flexible rack engaging the teeth on a pair of gears. A sprocket, being a toothed wheel whose teeth are shaped to mesh with a chain, is a form of gear. From a viewpoint based on its history and development, chain is a mechanical belt running over sprockets that can be used to transmit power or convey materials. Chains have the following four basic functions. Transmit power. Convey objects or materials. Convert rotary motion to linear motion, or linear motion to rotary motion. Synchronize or to time motion Chains have the following general advantages over other equipment intended to do the same functions. Have controlled flexibility in only one plane. Have a positive action over sprockets, no slippage takes place. Carry very heavy loads with little stretch. Efficiency of a chain joint passing around a sprocket approaches 100 % because of the large internal mechanical advantages of links in flexure. Provide extended wear life because flexure takes place between bearing surfaces with high hardness designed specifically to resist wear. Can be operated satisfactorily in adverse environments, such as under high temperatures or where they are subject to moisture or foreign materials. Can be manufactured from special steels to resist specific environments. Have an unlimited shelf life. They do not deteriorate with age or with sun, oil, or grease. Types of chains From industry stand point, the major types of chains are (i) roller chains, (ii) leaf chains, (iii) silent chains, (iv) engineering steel chains, and (v) flat-top chains. (Fig 1) Fig 1 Types...