Construction of Roller Chains :

The different components of a roller chains include the outer plate, the inner plate, pin, bushing, and roller. Single strand roller chain with one roller link between plates is most commonly used for transmission of mechanical power on many kinds of domestic , industrial, and agricultural machinery , including conveyors, printing presses, cars, motorcycles and bicycles. Conversely, where extra strength and the smooth drive of a smaller pitch is necessary, instead of just single strand chain, with one roller, there may be two rollers ("duplex"), three rollers ("triplex"), or more rows of plates and bushings running parallel, with bushings and rollers between each adjacent pair, and the same number of rows of teeth running in parallel on the sprockets to match. Timing chains on automotive engines, for example, typically have multiple rows of plates called strands.

There is also bushingless roller chain, which is comparable in use, although not in construction. Instead of separate bushings or sleeves that can hold the inner plates together, the plate has a tube stamped into it protruding from the hole which serves the same purpose. Clearly, this system has the advantage of removing one step in the assembly of the chain, reducing time and cost for the users.

Roller chains are often tied together through what is known as a master link (also known as a connecting link). The master link typically has a single pin held by a horse-shoe-shaped clip rather than through friction fit, thus enabling it to be inserted or removed with simple tools.

Materials Used for Roller Chains :

Steel chains are most often used in the industrial units of today. Steel is heavy enough to stand up to the punishment the chain will receive, and steel is thick enough to maintain itself over many hours of work every day. A chain that is settled in its place should last a very long time, and steel is the most durable product available.

A Nickel Plated Coating on each steel roller chain helps prevent wear on the chain over time as the chain is used. A nickel plated coating on a roller chain will wear away long before the steel begins to wear. You can observe the wear on the plating. Plated roller chain is standard chain which is nickel-plated before assembly. It features a sheen and has the property of being resistant to corrosion, together with the same strength and wear resistance as standard roller chain. This makes it ideal for use with machines which must be kept highly clean, such as food processing equipment, textile machines, business machines, and printing machines. In addition, the corrosion resistant feature of nickel-plated chain permits its use either underwater or in places where conditions of high humidity prevail. “NP” is added to the chain number for identification.

The coating is fitted to every part of the chain, and the coating makes the chain noticeably slick. You may also apply grease to the chain in order to keep it running, but you do not need to apply much. Maintenance on these chains is much easier than it would be otherwise, and you will be able to keep the chain working and moving for quite a long time.

Stainless roller chain made of 304 stainless steel, has superior corrosion and heat resistance properties. Stainless steel chains are the best in corrosive environments. Stainless steel will not tarnish, but the steel may not be very thick or as hard as steel chain. An alternative 600 series chain has specially hardened pins, bushings and rollers for greater wear resistance than 304 series chain. 600 Series Steel Chain provides both corrosion resistance and good wear. The special 600 series stainless steel material is used in the round parts which allowsfor greater working loads. The side plates are “304” series stainless steel allowing increased corrosion resistance. 600 series stainless steel chains are ideal when FDA regulations are required to be met You may find that a steel chain will last longer than a chain made from stainless do to stress or fatigue. Steel has therefore been the standard in the industry.

In summary, most roller chain is made from plain carbon or alloy steel, but stainless chain is used in food processing machinery or other places where lubrication is a problem, and nylon or brass are occasionally seen in those applications for the same reason.