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inexpensive, but they will allow some oil to escape and some dust and dirt to enter the casing. Oil- and dustproof casings have double lap joints and double oil seals at the shafts. They are strongly recommended for slinger disc and pressure stream types of lubrication. They are more expensive, but they virtually eliminate oil leakage and prevent contaminants from reaching the drive. Sizing for Clearance. Sufficient clearance between the chain and the casing is essential if maximum potential wear life from the chain is to be obtained. At least 3 in clearance is needed around the periphery of the chain and 3 4 in on each side of the chain. Additional clearance must be provided in the bottom of the casing to accommodate chain sag from wear elongation. The required allowance for chain sag may be obtained from Fig. 15.4. Sizing for Heat Dissipation. A chain casing also may need sufficient surface area for heat dissipation. The oil temperature should not exceed 180 F (total of ambient temperature and temperature rise). The temperature rise for a given chain casing may be estimated from Eq. (15.5), which presumes 98 percent chain drive mechanical efficiency. Th = 50.9 HP AKh (15.5)
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where Th = temperature rise, F HP = transmitted horsepower A = exposed casing area, ft2 Kh = overall film coefficient of heat transfer, BTU/(h ft2 F) Kh = 2.0 for still air, 2.7 for normal circulation, and 4.5 for rapid circulation The equation may be rearranged to obtain the required surface area of the casing: A= 50.9 HP Th Kh (15.6)
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If a casing with the required surface area is too large for the available space, a separate oil cooler may be needed. This short section gives only the rudiments of designing a chain casing. More information may be found in Refs. [15.5] and [15.6], machine design textbooks, or manufacturers literature.
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15.4.6 Specific Lubrication Recommendations Roller Chain. The required type of lubrication is directly related to the speed of a roller-chain drive. The limiting speeds for standard sizes of roller chain are shown in Table 15.6. More detailed information may be found in Refs. [15.5] and [15.6] or in manufacturers literature. Engineering Steel Chains. The required type of lubrication for an engineering steel drive is related to speed, but the relationship is more complex than for a rollerchain drive. The approximate limiting speeds for standard sizes of engineering steel chain, on 12-tooth sprockets only, are shown in Table 15.7. The values in the table are for general guidance only. When designing a drive, consult Ref. [15.5] or manufacturers literature.
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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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TABLE 15.6 Roller Chain Speed Limits by Lubrication Type
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Limiting speed, fpm ANSI No. Type 1 Type 2 Type 3 25 480 3250 35 350 2650 40 300 2200 50 250 1900 60 80 100 120 140 160 100 1000 180 90 935 200 80 865 240 75 790
215 165 145 125 110 1750 1475 1250 1170 1050 At all speeds higher than for Type 2
TABLE 15.7 Offset Sidebar Chain Speed Limits by Lubrication Type Limiting speed, rpm of 12-tooth sprocket only ANSI No. Type 1 Type 2 Type 3 2010 33 300 2512 33 200 2814 3315 3618 4020 4824 35 65 5628 38 N/A
33 32 29 30 160 115 100 85 At all speeds higher than for Type 2
Silent Chains. The required type of lubrication is related to speed for silent-chain drives also, but again, the relationship is more complex than for roller-chain drives. The approximate limiting speeds for standard sizes of silent chain are shown in Table 15.8. The values in the table are for general guidance only. When designing a drive, consult Refs. [15.4] and [15.5] or manufacturers literature.
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