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BELT DRIVES 14.34
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FIGURE 14.25 Construction and differences of timing belts. (a) Polychloroprene (rubber); (b) polyurethane; (c) heavy-duty.
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In addition to the belt types mentioned above, there are special belts with pitches or tooth shapes adapted to particular applications. There exist also synchronous belts with teeth on the back to provide for a two-side running capability and others with special back configurations, e.g., for transportation purposes. Geometric data for these special belts may be found in the catalogs of the respective manufacturers. Figure 14.26 shows an assortment. Because of their ability to transmit power synchronously with the required angular accuracy, synchronous belts are used to an ever-increasing extent, with new modes of application being added constantly. Classic applications are as follows:
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Light-duty conveyors (office machinery, food industry) Positioning drives (peripheral equipment of electronic data processing systems, machine tools, screening machinery) Synchronizing gears [camshaft drives (OHC), textile machinery, paper machinery]
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Figures 14.27 to 14.29 show some typical synchronous-belt applications. To ensure trouble-free operation and a long life of the drive, the following recommendations should be observed:
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The belt should be pretensioned only to the degree necessary to prevent skipping of the belt on starting or braking. Excessive initial tension leads to reduced belt life and in some cases to extreme noise levels. To prevent tension member damage (e.g., kinking or breaking), the belt has to be placed on the pulleys without tilting them. To facilitate this, an axial-shifting device should be provided on one of the pulleys. To prevent excessive wear of belt sides and noise from lateral contact of belt and pulley flanges, shafts and pulleys have to be aligned with extreme care. Slight lateral contact of belt and pulley flanges is attributable to the manufacturing process
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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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FIGURE 14.26 Synchronous belts with special back configuration.
FIGURE 14.27 Synchrobelt timing belts for sophisticated typewriter drive mechanism. (Continental Gummi-Werke Aktiengesellschaft.)
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BELT DRIVES 14.36
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FIGURE 14.28 Planer machine drive with Synchrobelt timing belt; the driving speed is 30 000 min 1. (Continental Gummi-Werke Aktiengesellschaft.)
FIGURE 14.29 Camshaft control with Synchrobelt HTD timing belt. (Continental Gummi-Werke Aktiengesellschaft.)
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BELT DRIVES 14.37
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(twisting of tension member and its slight inclination) and does not affect the running characteristics or the life of the belt. If feasible, belt tighteners should be arranged to act on the inner surface of the slack side of the belt; they should be toothed, too. The arc of contact should be as small as possible.
14.5 OTHER BELT DRIVES
14.5.1 Special Types Poly-V-belts are similar to V-belt assemblies; however, their cover band rests on the pulleys, contains the cord, and takes the tension, whereas the individual V-sections, called ribs, solely transmit the peripheral force between pulley and cover band. The ribs have no cords (Fig. 14.20i) and fill up the pulley grooves almost to the bottom. Thus they are susceptible to foreign matter entering between the belt and the pulley. Because of the relatively rigid cover band resting on the face of the pulley, particularly accurate alignment of the pulleys is required, as it is with flat-belt drives. The belts are remarkably quiet. V-belts with a belt-groove angle of 60 are cast belts (Fig. 14.20g) made of polyurethane with polyester tension members. Because of the higher friction coefficient of polyurethane on steel, the large included angle of 60 is required to prevent self-locking. Because of the manufacturing process, these belts show a substantially greater dimensional accuracy, resulting in particularly quiet operation. They are designed for maximum velocities of up to 50 m/s and are used mainly in machine tools. Hexagonal (double-V) belts (Fig. 14.20f ) have a symmetric special profile.The ratio of the maximum width to the height of the section is approximately 1.25. DoubleV-belts may be operated in one plane on counterrotating pulleys. The power transmission capacity is approximately equal to that of conventional V-belts of equal width with small pulley diameters. Minimum pulley diameters are also about equal to those of conventional V-belts. Double-V-belts are suited for multiple-shaft drives operated in one plane with counterrotating pulleys. They are especially suited for coupled operation, with a tensioning or coupling shaft riding on the back of the belt and being able to transmit power, too. Double-V-belts are used for medium-duty drives (combine harvester) as well as for light-duty tools (gardening equipment, rotary sweepers). Toothed V-belts, which must not be confused with synchronous belts, are available as standard, narrow-, and wide-V-belts with punched or preformed teeth in the belt carcass to increase flexibility. Thus, with only a slight reduction in power transmission capacity, the minimum permissible diameter of the smaller pulley may almost be halved, so that the space requirement of such a belt drive with equal ratio or speed range is reduced substantially. These toothed V-belts are subject to the effects produced by their polygonal shape; i.e., the teeth cause running in of shock loads (which may result in irregular transmission of motion), additional dynamic stress of bearings, and even (in the case of high peripheral velocities) noise. Round belts are versatile, simple, and reliable connectors for the transmission of small torques and medium velocities. Their main advantage is polydirectional flexibility. There are two different types: homogeneous round belts made of one material (rubber, plastic) and round belts with tension member (Fig. 14.30).
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