![]() Because most pulleys are driven by the friction between the pulley and the belt, if a part of a mechanism jams, then the belt transmitting power will slip on its pulleys instead of stalling the motor. Belts and pulleys can be used to transmit power over larger distances and in constricted spaces, which is one advantage they have over gears. Pulleys are also one of a few different methods of transmitting rotation from one axis to another. Certain types of pulley systems, like the block and tackle (to be explained later), can actually lessen the applied force needed to lift an object via a system of moving pulleys and lines, which can be very useful in high-load situations. Because the rope or belt is looped around the circumference of the pulley, the force of the object on one end of the rope can loop around the pulley to the other end. Elevators, cranes, and boats all use pulleys because a pulley changes the direction of the applied force on the belt. 2.Pulleys are probably most commonly used for lifting heavy loads and transmitting power across axes. 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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