IPDB › China Industry › Industrial Equipment & Components › Bearing
All Types of Bearing Single Row Deep Groove Ball Bearings Sizes1
Angular Contact Ball Bearing, Cylindrical Roller Bearing, Rolling Bearing
Qingdao Fuqin Imp. & Exp. Co., Ltd.
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Product Description Product Description Structure and Parts of BearingsCageIn daily operations, cage will be subjected not only to mechanical action from friction, tension and inertial force, but to chemical reaction from lubricants, additives, solvents or coolants. Therefore, design and materials of cage are very inportant for its performance and the reliability of bearing in usage.Flate/FUDA offers the following kinds of cage for deep groove ball bearings:Materials of BearingsMaterials for bearing rings and parts largely determine the bearing's performance and life. FLATE/FUDA puts more efforts to select materials for bearing rings and part suppliers in a rigorous manner.Materials and components of bearing rings for FLATE/FUDA bearings are provided by the world's top suppliers special for serving bearign manufacturers, fundamentally solvign the issue that our bearings lag behind imported bearings in terms of materialsfor a long time.FLATE boasts a set of strict and polished incoming goods inspection system. Before being put into storage, every batch of steels and parts is under systemic inspection, including analysis of material composition, metallographice analysis, accuracy check, assembly test, etc.Materials for Bearing Ring and Roller BodyBearing ring and roller body are mainly made of high C-Cr bearing steel. Listed below are compositions of material for bearing ring and roller body.Steel CodeChemical composition%Gcr15SAE52100DIN 100 Cr6JIS SUJ2CSiMnPSCrMoCuNi0.95-1.050.15-0.350.25-0.45<0.025<0.0251.40-1.65-<0.25<0.30Material for bearing ring and roller body mainly consists of high C-Cr bearing steel.Material of cagesMaterial of cages need good wear resistance, stable size and metal strength. Therefore, operation environment should be mainly considered in selection of material of cages.Drawing steel sheet cageThese light cages hold a high strength with reduced friction and wear in an effective way after surface treatment. The following table covers compositions of material for cold-rolled steel sheet.Steel codeChemical Composition%JISG 3141SPCCCSiMnPSNiCr<0.12-<0.5<0.04<0.045--Brass cageCut brass cage is adopted in small and medium bearings. However, brass cage is not suitable for compressors with ammonia cooling due to potential seasonal cracking of brass. It is recommended to replace it with iron cage.Nylon cageAccording to the type and usage of bearings, nylon cages are widely adopted, but they are inappropriate for environments where the temperature is above 120oC or below 40 oC. Most of cast molding cages adopt nylon PA66 material, with or without glass fiber reinforcement whose advantage is a good combination of strength and elasticity.Materials for dust shield and seal ringMaterial for dust shieldFLATE/FUDA bearings use cold-rolled tin plate as the standard mateiral for dust shields, but also use stainless steel of AISI-300 specification at times.Material for seal ringSeal rings are mainly made of NBR. For high temperature, fluororubbers and silicon rubbers are widely used as well.TypeASTM D1418 NameTemperature RangeHardness(Shore A)FeaturesRestrictionNitrile butaduene rubberNBR-40oC~120oC40-90Low compressionHigh ductilityHigh corrosion resistancesuperior oil resistanceUnsuitable for high temperature conditions;No exposure to the sun and corrosion of chemicalsSilicon rubberMQ/PMQVMQ/PVMP-70oC~200oC25-80High temperature resistanceDesiccation resistanceSunshine resistanceaging resistance to ozonePoor surface abrasion performance and crack resistance, higher wear resistanceHydrogenated(nitrile-butadiene rubber)HNBR/NEM-35oC~65oC50-90Heat resistanceHigh ductilityChemical resistanceUnsuitable for high temperature conditions and shall avoid exposure to the sun and corrosion of chemicalsFluororubberFKM/FPM-28oC~200oC50-95High temperature resistanceSignificant chemical resistancecorrosion resistance to petroleum productsIt is not suitable for working conditions of low temperature.ACM rubberACM Rubber-18oC~175oC40-90Stronger resistance to hot oilSunlight and ozoneHigher crack resistancepoor waterproof performance;unsuitable for working condition of ultra-low temperatureWarning:flurorubber is safe and harmless under normal working condition of below 200oC, but it will give off smoke if the temperature exceeds the ultimate temperature of 300oC that is equivalent to flame for cutting steel tubes. Inhalation of the smoke is harmful to human bodies including eyes. In addition, the smoke should be avoided to contact skin.Lubrication of BearingsGrease lubricationLipid lubricants are much easier to use than oil lubricants. Due to its ciscosity,grease is more durable and only needs simple sealing equipment to contain. Grease is hard to be changed, beacause the usual approach of it is to press grease into device to make fresh grease squeeze used grease out. General speaking, grease with low viscosity primary oil is more suitable for high speed operations at low temperature, while grease with high viscosity primary oil is suitable for heavy load.Oil lubricationOil lubrication is more suitbale for applications under conditions of high speed and high temperature, effectively taking the heat generated in operation of bearings away. Viscosity of oil determines the effects of oil lubrication. Low viscosity will lead to inadequate formation of oil film, while high viscosity will increase viscous drag and temperature. In general, the higher rotational speed is the lower viscosity of lubricant oil will be; the larger load is, the higher viscosity of lubricant oil will be.Primary oilIn grease, primary oil accounts for 75-96%. In mass fraction, the performance of grease mainly relies on the nature of primary oil. Particularly when it is with cold flow property and at high temperature, its service life is bound up with primary oil. Grease with low viscosity primary oil is usually applicable to low temperature and low load, while lubrication grease with high viscosity primary oil is applied to high temperature and high load. Primary oil used in grease includes mineral oil and synthetic oil. The commonly used synthetic primary oils contain lipid oil, sythetic hydrocarbon oil, perfluoropolyether, silicon oil and PPO, etc.ThickenerThickener generally accounts for 4~20% in mass fraction. Its functions are to suspend primaty oil, reduce the flow of primaty oil, and increase adhesion of oil to friction surface. Thickener has two categories: metallic soap base and non-metallic soap base. Critical operating temperature, mechanical stability, water resistance and other properties of grease are determined by thickener, for example, sodium soap base can react with water to form a kind of latex, which can not be applied to running bearing in the atomsphere of high temperature.AdditiveIn grease, primary oil accounts for 0.5~10%. In mass fraction, which is used for the improvement of operating performance and life of grease. Accordign to the classification by function, it can be divided into thickener(strong adhesion), antioxidant, extreme-pressure additive, corrosion inhibitor,etc.
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