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Handbook of Lubrication Episode 2 Part 9

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Tham khảo tài liệu 'handbook of lubrication episode 2 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 554 CRC Handbook of Lubrication Table 7 RECOMMENDED AGMA LUBRICANTS FOR INTERMITTENT METHODS OFAPPLIcAtION LIMITED TO 1500 FT MIN 8 M SEC PITCH LINE velociTy 3 Mechanical spray systems Ambient temp in degrees Fahrenheit Celsius b EP lubricant Residual compound11 Gravity feed or forced drop method using EP lubricant 15 60 -9 16 14R 40 100 4 38 12 EP 15R 12 EP 70 125 21 52 13 EP 15R 13 EP Note AGMA Viscosity number recommendations listed above refer to gear oils shown in Table 5. a Feeder must be capable of handling lubricant selected. b- Ambient temperature is temperature in vicinity of the gears. c Greases are sometimes used in mechanical spray systems to lubricate open gearing. A general purpose EP grease of number 1 consistency NGLI is preferred. Consult gear manufacturer and spray system manufacturer before proceeding. d Diluents must be used to facilitate flow through applicators. From Standard AGMA 251.02 Lubrication of Industrial Open Gearing American Gear Manufacturers Association Arlington Va. November 1974. With permission. runs off the gear case it can be collected in troughs and directed to bearings. For very slow gearing using heavy oil it may be necessary to use scrapers to remove oil from the sides of the gear rim for use as a bearing lubricant. If for other reasons the sump oil level is higher than required for gearing lubrication an oil pan can be used to limit the amount of oil that the gear contacts. The flow of oil into the pan is controlled by small holes below the oil level to eliminate excessive churning and improve efficiency. Oil pans are recommended for gears with pitch line velocities over 13 m sec 2500 ft min and work well for slow- and moderate speed gearing with pitch line velocities up to 18 m sec 3500 ft min . Higher speed gearing will tend to centrifugally throw off most of the oil before it gets into mesh. The lighter oil generally used with high-speed gearing tends to compound the problem. Higher power losses caused by churning .