![]() They come into play when shafts are separated at distances greater than that for which gears are practical. The only losses in a chain drive are due to friction between the chain links and the sprocket.Ĭompared to gears, chain drives are way more versatile when it comes to operating distances. Having no slippage also ensures high mechanical efficiency. There is no lag in power transfer and hence, it serves as a timing chain in applications such as internal combustion engines. One of the main advantages over a belt drive is that a chain drive maintains a constant speed ratio, thanks to its zero slip feature. This applies mechanical force onto the driven shaft, transmitting mechanical power in the process. When the prime mover rotates, the chain wrapped on the shaft’s sprocket rotates with it. The holes in the chain links fit over the sprocket teeth. A conventional chain drive consists of two or more sprockets and the chain itself. 2.VI Disadvantages of Chain Drives What Is a Chain Drive?Ĭhain drive is a type of mechanical power transmission system that uses chains to transfer power from one place to another. ![]() for their assistance in the preparation of this article. Plant Engineering magazine extends its appreciation to U.S. The relative position of the driver and driven sprockets and the tight- and slack side strands greatly influence the drive life (Fig. Do not have the chain submerged more than Drive chain arrangements Oil bath lubrication submerges part of a sprocket and chain in a pool of oil. The actual quantity depends on chain speed. In drip lubrication, oil is metered from an oil cup at 5 to 20 drops of oil per minute. Apply oil about every eight hours or as needed. In manual lubrication, oil is applied with an oil can or brush. Lubricate the chain where tension is minimal, applying the lubricant in the clearance between link plates. Obtaining effective lubrication for a chain is a matter of correct application in terms of lubricant used and how and where in the strand it is provided. Properly lubricated chain has a longer wear life and is less likely to rust. However, it is essential to lubricate roller chain. Power transmission chains are usually pre-lubricated with rust prevention oil before shipping. In drives where the chain is operated at established ratings, proper lubrication is as much a part of the rating as the load and speed promised by the rating. Lubrication is an important factor in obtaining the desired life from a chain. When making drive selections, consider the load imposed on the chain by the input power and type of equipment to be driven, Service factors are used to determine design horsepower or additional chain capacity required to compensate for the load (Fig. ![]() Sprockets wear less than gears because the load is distributed over many teeth.Ĭhain is more suitable for long-term, continuous power transmission with limited torque fluctuation.Ĭhain is weak when subjected to side loads. Standardization of chains allows ease of selection.Ĭhain sprockets can be smaller than belt pulleys and transmit the same torque. It is possible to use chain with multiple shafts or drives and both sides of the chain. Speed reduction/increase of up to 7:1 can be easily accommodated. However, there are applications where it can be an either/or situation. Each has properties that enable them to carve out a niche all their own. Power transmission chain competes with V-belts, synchronous belts, and gear drives. Chain is basically a set of pins, rollers, bushings, and connecting links (Fig. Another viewpoint terms chain a mechanical belt, running over wheels, which can be used to transmit power. From one viewpoint, chain is a continuous, flexible rack engaging a pair of gears. A chain is a reliable machine component that transmits power by tensile force.
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