It is often used to convey power to the wheels of a vehicle, particularly bicycles and motorcycles. A chain-drive system uses one or more roller chains to transmit power from a differential to the rear axle. One problem with roller chains is the variation in speed, or surging, caused by the acceleration and deceleration of the chain as it goes around the sprocket link by link. 0000089564 00000 n It gained prominence as an alternative to the Système Panhard with its rigid Hotchkiss driveshaft and universal joints. These chains are commonly used in industrial equipment where ultimate smoothness is required. Required fields are marked *. Most engineering steel chains are used in conveyors, bucket elevators, and tension linkages. Does not transmit power Used to take up slack or change direction of rotation Key Belt Drive Design Characteristics 1. 0000089990 00000 n and their uses with pictures. Since chain drives are positive drives there is no slip, hence the velocity ratio will remain constant. 0000011910 00000 n ��$&'G{;[k+i)I q1Qa!A~]=}C#cS3sKw7Wg/o�Y>aQ1q I)i+k9yE%eU5u M-m}6�v��N�.�n��@��Y����� f#���������P$� Chain drives transmit power up to 100kw and operating peripheral velocity up to 15m/s. This is an area in which chain drives frequently compete directly with timing belt drive systems, particularly when the engine has one or more overhead camshafts, and provides an excellent example of some of the differences and similarities between the two approaches. This contact occurs at a point below the pitch circle of the sprocket. 0000033221 00000 n Less common alternatives to timing chain drives include spur gears or bevel gears combined with a shaft. This contact occurs at a point below the pitch circle of the sprocket. x�b```f`����� �� Ȁ ��@Q���L�� Roller Drive Chain Selection Technical Information 29 Required information for drive selection: 1.Type of input power (electric motor, internal combustion engine, etc.). Only a few are used in drives. Used to break a drive into 2 or more stages and to increase or decrease final speed ratio. In such cases, sprockets (wheels with teeth shaped to mesh with a chain) take the place of gears and drive one another by means of a chain passing over the sprocket teeth. 0000019057 00000 n 0000096380 00000 n A chain is a series of traveling journal bearings with a means to engage the teeth of a sprocket and transmit force and motion. 228 0 obj<> endobj Also, the more positive meshing of a chain can make it easier to build gears that can increase or shrink in diameter, again altering the gear ratio. Subscribe to our newsletter to get latest information about engineering topics. These include integral link chains, such as bar-link, flat-top, and welded steel chains. 0000092972 00000 n 230 0 obj<>stream 0000095954 00000 n Although chains can be made stronger than belts, their greater mass increases drive train inertia. 0000096664 00000 n In other situations, a second gear is placed and the power is recovered by attaching shafts or hubs to this gear. The velocity ratio can be as high as 8:1. 0000088002 00000 n However, some newer synchronous belts claim to have "equivalent capacity to roller chain drives in the same width".[11]. Chain drives are recommended to transmit power up to (A) 25 kW (B) 50 kW (C) 100 kW (D) 500 kW. 0000033015 00000 n For example, when the bicycle pedals' gear rotate once, it causes the gear that drives the wheels to rotate more than one revolution. Most bicycle chains are made from plain carbon or alloy steel, but some are nickel-plated to prevent rust or simply for stylish. Leaf chains must often lift very large loads, and hence they need high yield strength and do not get permanently stretched when they lift large loads. 0000091836 00000 n Chain drive is a way of transmitting mechanical power from one place to another. As the sprocket rotates, the chain is raised up to the pitch circle and is then dropped down again as sprocket rotation continues. Vn����?��t����R qw�;�}^�N���9�����t��G'"�x��)���1��t�L,z���3_ �?t��q�+�i�X��Ǒ�N�yHڐ��{Y|�4����wν�|�����|�$�����h��IS�|�Y��B �[h:QS����MH��b�j��$�P��9MLl@1����[�. Generally this effect is less than 0.6 percent, but when combined with the deflection of the pulley center and errors of belt pitch or pulley pitch, it can amount to 2 to 3 percent. Roller chain and sprockets is a very efficient method of power transmission compared to (friction-drive) belts, with far less frictional loss. But in toothed-belt systems, chordal action occurs by circle and chord, the same as chains. For this reason virtually all high-performance motorcycles use chain drive, with shaft-driven arrangements generally used for non-sporting machines. 0000089280 00000 n 0000098652 00000 n If one sprocket rotates at a constant speed, then the chain (and probably all other sprockets that it drives) must accelerate and decelerate constantly. Also, it had less unsprung weight at the rear wheels than the Hotchkiss drive, which would have had half the weight of the driveshaft, and differential to carry as well. It gained prominence as an alternative to the Système Panhard with its rigid Hotchkiss driveshaft and universal joints. Chains are often narrower than belts, and this can make it easier to shift them to larger or smaller gears in order to vary the gear ratio. Also, the more positive meshing of a chain can make it easier to build gears that can increase or shrink in diameter, again altering the gear ratio.
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