barcode generator vb.net code CHAIN DRIVES 15.9 in Software

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CHAIN DRIVES 15.9
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CHAIN DRIVES
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FIGURE 15.4 Chain sag versus center distance.
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sprockets may be required. Idler sprockets should engage the chain in the slack span and should not be smaller than the small sprocket. At least 3 teeth on the idler should engage the chain, and there should be at least 3 free pitches of chain between sprocket engagement points. Multiple-Strand Chain. Multiple-strand chain may be required when the load and speed are too great for a single-strand chain, or when space restrictions prevent the use of large enough single-strand sprockets. Drive Arrangements. A number of recommended, acceptable, and not recommended drive arrangements are shown in Fig. 15.5.
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15.3.2 Selection Procedure Obtain Required Information. It is very important to obtain all the listed information before making a selection. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 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 Check for any unusual drive conditions, such as
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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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CHAIN DRIVES 15.10
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FIGURE 15.5 Drive arrangements.
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Frequent stops and starts High starting or inertial loads Temperatures above 150 F or below 0 F Large cyclic load variations in a single revolution Multiple driven shafts
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If any of these, or any other unusual drive condition, is found, consult a chain manufacturer for help with the selection. Determine Service Factor. The average required power for a drive usually is given. The peak power may be much greater than the average, depending on the power source and the driven equipment. A service factor, obtained from Table 15.2, accounts for the peak loads. The load classification for various types of driven equipment may be found in Ref. [15.1] or [15.5] or in manufacturers catalogs. Calculate Design Power. Obtain the design power by multiplying the average power times the service factor from Table 15.2.
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CHAIN DRIVES 15.11
CHAIN DRIVES
TABLE 15.2 Service Factors for Roller Chain Drives 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
Make Preliminary Chain Selection. Enter the chart, Fig. 15.6, with the design power and the speed of the small sprocket to select a preliminary chain. If no singlestrand chain will transmit the design power at the required speed, or if space is restricted, multiple-strand chain may be required. If multiple-strand chain is to be selected, divide the design power by the multiple-strand factor, from Table 15.3, before entering the selection chart. Note that optimally the drive will operate near the peak of the rating curve. If the speed and power are low to moderate and the center distance is long, double-pitch chain may be acceptable. A selection procedure for double-pitch chains is given in Ref. [15.2].
TABLE 15.3 Roller Chain Multiple Strand Factors Number of strands 2 3 4 Multiple strand factor 1.7 2.5 3.3
Select Small Sprocket. Refer to the horsepower tables in Ref. [15.1], [15.2], or [15.5] or in manufacturers catalogs to select the small sprocket. Again, if multiplestrand chain is being considered, the design power must be divided by the proper multiple-strand factor from Table 15.3. Several different combinations of chain and sprocket sizes may be satisfactory for a given drive. Study the tables to see if increasing the number of teeth on the small sprocket might allow use of a smaller-pitch chain, or if decreasing the number of teeth on the small sprocket might allow use of a larger-pitch single-strand chain instead of a multiple-strand chain. Consult sprocket manufacturers catalogs to ensure that the sprocket bore capacity is adequate for the shaft. If it is not, select a larger sprocket. Select Large Sprocket. Determine the number of teeth required on the large sprocket by multiplying the number of teeth on the small sprocket by the speed ratio. Ensure that the selected large sprocket will fit within any space restrictions and clear all obstructions. If there is an interference, a smaller-pitch, multiple-strand chain might be needed. Make Final Chain Selection. Choose the most suitable drive from the alternatives selected earlier. The final choice may be based on economics, performance, effi-
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