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Creator European Article Number 13 in Software BELT DRIVES 14.27

BELT DRIVES 14.27
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BELT DRIVES
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The flexibility of the V-belts mentioned thus far may be increased by cross grooves worked into the inner surface of the profile (Fig. 14.20e). These grooved belts allow smaller pulley diameters and require less space at slightly reduced power transmission capacity than other belts; however, the grooves are the cause of periodic running in of shock loads and noise. A V-belt assembly (Fig. 14.20h) is composed of up to five standard or narrowV-belts connected by an elastic cover band which does not rest on the pulleys. The cover band prevents twisting or excessive vibration of individual belts. The grooves of the V-belt pulleys are standardized (ISO standards). The pulleys are castings or weldings or steel-plate parts. In general, pulley diameters below the minimum specified should not be used. The groove flanks must be smooth and clean to ensure a sufficiently long belt life. Applications of V-belts are practically unlimited. Because of the variety of sections available, the V-belt may be used for fractional-horsepower drives with minimum power transmission capacity in precision machines, phonographic equipment, and domestic appliances; for light drives, e.g., of centrifugal pumps and fans; and for all sizes of drives for general mechanical engineering purposes up to heavy-duty drives, such as rolling mill, rock crusher, excavator, and crane drives. In general, the power transmission capacity is approximately 700 kW maximum; it may be increased to 1000 kW and in very rare cases to approximately 5000 kW. Because of the extreme variety of applications in mechanical engineering, general belt-life data cannot be given. Another explanation is that belt life largely depends on the conditions of use. Assembly and operating conditions affect belt life, as do environmental conditions such as oil, dust, and climatic conditions. The power transmission capacities specified in the relevant standards are based on the very high empiric belt life of 24 000 h, which can be reached only under optimum operating conditions, i.e., no misalignment of the pulleys, no overload, correct belt tension, normal ambient conditions, etc. One of the particularly important areas of V-belt application is the automotive industry with its large primary equipment production series and substantial sparepart need. The V-belt as a drive unit connects the crankshaft and different accessory units, e.g., generator, cooling-water circulating pump, and fan.The V-belt may also be used for driving air-conditioning equipment or turbosuperchargers. The life of car V-belts is calculated for a total distance of 50 000 to 80 000 kilometers (km). If higher power transmission capacities are required in mechanical engineering, multiple drives (Fig. 14.21) are used. When used as main drives in situations involving high cost in case of failure, such as mine fan drives and drives used in the metallurgical, glass, and cement industries, multiple drives also meet the demand for safety, since the probability of sudden failure of a complete belt set is very small.The uniformity of initial tensions and speed ratios of all belts of multiple drives is a prerequisite for smooth running and equal distribution of total power to all belts. Differences in speed ratios and initial tensions will lead to a reduction in belt life. Thus the complete set of belts should be replaced, if necessary, not just a single endless belt.
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14.4 SYNCHRONOUS-BELT DRIVE
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The synchronous belt is a relatively new machine element combining the advantages of positive and nonpositive flexible connectors. In contrast to the nonpositive belt drives, the pulleys and belts of synchronous-belt drives have meshing teeth, allowing synchronous power transmission with angular accuracy (Fig. 14.22). To prevent rid-
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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