>> P.55
1N=0.102kgf=0.2248lbs.1mm=0.03937inchthe bearing rotates together with the bearing forming an air wall. As shown in Fig. 24, the jet from the noz-Lubricantszle blows directly into the space between the inner For rolling bearings, lubricating grease or oil is gener-ring and the cage. Due to the large amount of oil ally used. For special applications, solid lubricants are being used, it is more effective to make the discharge used.port larger, and use the forced discharge.When the dmn value (mean value of the bearing out-in millimeter x rotational side and bore diameters Lubricating greasespeed in min-1) is more than 1,000,000, the speed of Grease is a semi-solid lubricant made by mixing base the jet should be 10〜20 m/s, the nozzle diameter oil (liquid lubricant) and a thickener under heat and should be about 1 mm, oil supply pressure should be adding additives as required.0.1〜0.5 MPa, and the oil supply amount should be There are many types of grease according to various about 500 cc/min or greater. When the rotational combinations of base oil, thickeners and additives. speed is higher, the oil supply pressure and the oil Grease is usually classied by thickeners and base oil. amount should be higher.Table 35 shows the general properties of each type of grease.Reference examples of the lubricant greece brand and performance are shown on page M46.Fig. 24 Oil jet lubricationTable 35 Properties of various types of greaseName (Common name)Calcium greaseSodium greaseAluminum greaseMixed base greaseBarium greaseLithium greaseNon-soap base grease(Non-soap grease) ItemBase oil()()()Mobile greaseFiber greaseCup grease()()()Bentone greaseDiester greaseSilicon greaseMineral oilMineral oilMineral oilMineral oilMineral oilMineral oilDiester oilSilicon oilMineral oilSynthetic oilThickenerCa soapNa soapAl soapNa + Ca soap,Li + Ca soapBa soapLi soapLi soapLi soapBentoneSilica gel. Polyurea, etc.AppearanceButteryFibrous and Stringy and Fibrous and Fibrous and butterybutterybutterybutteryButteryButteryButteryButteryButteryPour point ℃80〜90150〜18070〜90160〜190150〜180170〜190170〜190200〜250200〜NoneOperatig temperature range ℃-10〜+70-20〜+120-10〜+80-10〜+100-10〜+135-20〜+120-50〜+120-50〜+180-10〜+150〜+200Pressure resistanceStrong to weakStrong to mediumStrongStrongStrong to mediumMediumMediumWeakMedium to weakMediumWater resistanceGoodPoorGoodGood, poor for Na+ Ca soap greaseGoodGoodGoodGoodGoodGoodMechanical stabilityFairGoodPoorGoodPoorExcellentExcellentExcellentGoodGood to poorFeatures and application Contains about 1% water. When the tem-perature rises to more than +80°C, the water evapo-rates and the grease sepa-rates into oil and soap. This is used for medium loads.Long fibrous grease cannot withstand high speeds, but has good pres-sure resis-tance proper-ties. Short fibrous grease is compara-tively good for high speeds.It has water and rust resis-tant proper-ties, and adheres easily to metal sur-face.Usable at fairly high speeds.It has water and heat resis-tant proper-ties. This is an all-purpose grease.This is the best all-purpose grease among soap based greases.Mainly used for high tem-peratures. Not suited to high speeds and heavy loads.Generally good heat resis-tance. Grease having a miner-al base oil is for general use. Grease having a synthetic base oil is suitable for special use where superior heat and chem-ical resistance properties are required.Excellent under low temperature conditions and has superior frictional prop-erties. Suitable for small bearings used in mea-suring instru-ments.A52ABCDEFGHIJKLM
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