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TABLE 14.3 Size of Pulleys for Flat-Belt Drives
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In addition to the applicable ratings of the various high-performance flat belts, their types, and their configurations, the following data are necessary for the calculations for a single-step flat-belt drive: 1. Type of prime mover (driving assembly), e.g., electric motor, combustion engine, water turbine, etc.; this is important for the determination of the corresponding service-correction factors. 2. Type of machine (driven assembly); this determines corresponding load factors, dependent on acceleration, forces of gravity, changing loads, etc. 3. Power to be transmitted P, in kilowatts. 4. Speed of driving pulley n1, in revolutions per minute. 5. Diameter of the driving pulley d1, in millimeters. 6. Speed of the driven pulley n2 , in revolutions per minute. 7. Diameter of the driven pulley d2, in millimeters. 8. Center distance e, in millimeters. 9. Adjustment range available (of tensioning device). 10. Allowable radial shaft loads of prime mover and driven assembly, loads on which the maximum shaft tensioning force Fw depends. With the use of the above data and the manufacturer s data, calculations for the flat-belt drive can be made, giving the designer the type of belt, belt width, dynamic and static shaft stresses, and the required elongation, expressed as the percentage of belt strain. Because of the special characteristics of flat-belt drives with high-performance belts, the determination of the drive data should be based on the following: 1. The belt velocity should be as high as possible (vopt). The higher the belt speed, the smaller the belt width and thus the shaft load. 2. In calculating drives with changing loads or cyclic variations, you should determine to what extent the damping properties of the tension ply materials can be utilized. 3. You have to examine whether the initial tension of the belt or the shaft load can be accurately calculated from belt strain data.
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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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4. The manufacturer can supply belts of all widths and lengths; you should examine, however, whether there are restrictions from the design point of view. 5. Finally, you must examine whether the belt can be manufactured in endless form or has to be assembled open-ended, with the ends being closed by welding after assembly. The following general guidelines apply to pulley design: 1. The pulleys for open and crossed flat-belt drives are crowned in accordance with ISO R 100 (Table 14.3) in order to align the belt, which tends to move toward the larger pulley diameter. 2. For speed ratios higher than 1/3 (i > 3), the smaller pulley may be cylindrical. Spatial belt drives are equipped with cylindrical pulleys. 3. The requirements for smooth running of the belt are as follows: Parallelism of both shafts, smooth pulley faces, static balancing up to belt velocities v of 25 meters per second (m/s), and dynamic balancing for velocities above 25 m/s.When certain aluminum alloys are used, abrasion may occur, reducing friction between belt and pulley to such a degree as to make power transmission impossible. Flat-belt drives are nonpositive flexible-connector drives used for the transmission of forces and motions between two or more shafts, particularly at greater center distances. This type of drive is superior because of its elasticity, enabling it to absorb shock loads, and its low-noise running. Its disadvantages are the greater forces acting on the shafts and bearings, resulting from the required initial tension, and the unavoidable belt slip. These properties are decisive for the preferred applications of flat-belt drives, e.g., in machine tools, textile machinery, mixers and grinders, paper machines, gang saws, wire-drawing machines, presses, punches, and compressors. Flat belts with suitable contours may also be used as conveyor belts. Figure 14.16 shows the drive of a hobbing machine. A high-performance flat belt was used in this case not because of its efficiency or damping properties, but because of the uniformity of rotational transmission from one pulley to the other. Preliminary studies have shown that even slight transmission deviations affect the dimensional accuracy of the tools manufactured on such machines. Belts for this application are subjected to a transmission accuracy test on a special test stand before delivery. Figure 14.17 shows the tangential belt drive of a textile machine. This drive of a ring spinning frame is typical of a so-called multipoint drive or, in particular, a tangential belt drive. In this machine, a high-performance flat belt of 35-mm width and approximately 82-m length drives a total of 500 spindles on each side of the machine. The total power of 25 to 30 kW per machine side is thus distributed to 500 separate work positions. Depending on the spindle speed, the belt velocity ranges from 25 to 45 m/s. The absolute constancy of the belt operating tension throughout the life of the drive is a necessary prerequisite for this type of application.
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