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Chain Pitch. Generally, the smallest-pitch chain that will transmit the required power at the required speed provides the most economical drive. Number of Sprocket Teeth Small Sprocket. A small sprocket with 12 teeth is normally recommended. If the speed ratio is high or space is restricted, a small sprocket with 9 teeth is acceptable. If the speed ratio is low, center distance is long, and space is not limiting, a small sprocket with 15 teeth is suggested. Large Sprocket. The size of the large sprocket is limited by available space, maximum allowable chain wear elongation, and manufacturing feasibility. Large sprockets with more than 66 teeth are not desirable because they limit maximum allowable chain wear elongation to less than 3 percent. Some manufacturers list their maximum-size stock sprockets at 50 teeth or less. Angle of Wrap. The minimum recommended angle of wrap on the small sprocket is 135 , or three teeth engaging the chain. Speed Ratio. The maximum recommended speed ratio for a single-reduction drive is 6:1. That is done so as to keep sprocket sizes within reasonable bounds and to obtain reasonably good chain wear life. Center Distance. The preferred center distance is from 30 to 50 times the chain pitch. The center distance should be adjustable to compensate for chain wear elongation. The minimum adjustment should be equal to at least one chain pitch. Chain Length. The required chain length may be estimated from Eq. (15.1). This will give chain length accurate to within 1 2 chain pitch. If a more precise length is required, consult Ref. [15.5] or manufacturers literature. Wear and Chain Sag. Maximum allowable wear elongation for offset sidebar chains is determined by component size and hardness. Most offset sidebar chains are designed to provide 5 to 6 percent wear elongation. Wear elongation may be limited by the number of teeth on the large sprocket. For that case, the maximum allowable chain elongation, in percent, is 200/N2. In a drive on approximately horizontal centers, chain wear elongation accumulates as sag in the slack span. The expected amount of sag for various amounts of wear elongation is shown in Fig. 15.4. The drive centers should be adjusted periodically to maintain sag at 2 to 3 percent of horizontal center distance. Idlers. When the center distance is long, the drive centers are more than 45 from horizontal, or machine members obstruct the normal chain path, an idler sprocket may be required. Idler sprockets should engage the chain in the slack span and should not be smaller than the small sprocket in the drive. At least 3 teeth on the idler should engage the chain, and there should be at least 3 pitches of free chain between engagement points. Drive Arrangements. A number of recommended, acceptable, and not recommended drive arrangements are shown in Fig. 15.5.
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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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15.6.2 Selection Procedure Obtain Required Information. Before an offset-sidebar-chain drive is selected, it is essential to obtain all the listed items of information. Note that the first 10 items are the same as for roller chain. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Source of input power Type of driven equipment Power to be transmitted Speed and size of driver shaft Speed and size of driven shaft Desired center distance and drive arrangement Means of center distance adjustment, if any Available lubrication type Space limitations Adverse environmental conditions Operating hours per day In addition, check for any unusual drive conditions, such as
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Higher than listed speeds Inadequate lubrication Very heavy shock loads Corrosive or very abrasive conditions More than one driven shaft Other than precision-cut sprockets
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When any of these, or any other unusual drive condition, is present, consult a chain manufacturer for assistance with the drive selection. Determine Service Factor. The combined service factor SF is calculated by multiplying the three individual factors from Tables 15.10, 15.11, and 15.12: SF = (SF1) (SF2) (SF3) The load classification for various types of driven equipment may be found in Ref. [15.5] or in manufacturers literature.
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TABLE 15.10 Service Factors for Offset-Sidebar-Chain Drives; Load Type, SF1 Type of input power Type of driven load Smooth Moderate shock Heavy shock Internal combustion engine with hydraulic drive 1.0 1.2 1.4 Electric motor or turbine 1.0 1.3 1.5 Internal combustion engine with mechanical drive 1.2 1.4 1.7
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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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