Spherical roller bearings - FSB Online

1 Spherical roller bearings691 Standard bearings .. 692 Open bearings .. 692 Sealed bearings .. 694 bearings for vibratory applications .. 696 SKF Explorer class 697 Special bearings .. 697 bearings on sleeves .. 698 Appropriate bearing housings .. 699 bearing data general .. 700 Dimensions .. 700 Tolerances .. 700 Internal clearance .. 703 Influence of operating temperature on bearing material .. 704 Axial load carrying 704 Minimum load .. 704 Equivalent dynamic bearing load .. 705 Equivalent static bearing 705 Supplementary designations .. 705 Mounting bearings with tapered bore .. 706 Measuring the clearance reduction .. 706 Measuring the lock nut tightening angle .. 708 Measuring the axial drive-up .. 708 Measuring the inner ring expansion .. 710 Additional mounting information .. 710 Product tables .. 712 Spherical roller bearings .. 712 Sealed Spherical roller bearings .. 736 Spherical roller bearings for vibratory applications.

2 740 Spherical roller bearings on adapter sleeve .. 744 Spherical roller bearings on withdrawal sleeve .. 758 Spherical roller bearings have two rows ofrollers with a common sphered raceway inthe outer ring and two inner ring racewaysinclined at an angle to the bearing axis ( fig). This gives them an attractivecombination of design features making themirreplaceable in many demanding applica-tions. They are self-aligning and conse-quently insensitive to misalignment of theshaft relative to the housing and to shaft deflection or Spherical roller bearings are leadingin design and can, in addition to high radialloads, accommodate high axial loads actingin both bearingsThe standard range of SKF Spherical rollerbearings comprises open bearings , sealed bearings and bearings for vibratory applications. In addition to the standard range, SKF offersa wide range of special Spherical roller bear-ings adapted for specific bearingsSKF Spherical roller bearings are producedin several designs, depending on bearingseries and size.

3 The differences are the arrangement of the floating guide ringas well as the design of the inner ring and the cages,as described in the following and shown (J), CCTwo window-type steel cages,flangeless inner ring and guidering centred on the inner ring(a).EC(J), ECC(J)Two window-type steel cages,flangeless inner ring, guidering centred on the inner ringand reinforced roller comple-ment (a).21 Spherical roller bearings6921 FigCA, CACOne-piece machined brasscage of the double-prongedtype, retaining flanges on theinner ring and guide ringcentred on the inner ring (b).CAFAs CA, but with a steel cageECA, ECACOne-piece machined brasscage of the double-prongedtype, retaining flanges on theinner ring, guide ring centredon the inner ring and reinforcedroller complement (b).ECAFAs ECA, but with a steel cageEWhen bearing bore diameter d 65 mm:Two window-type steelcages, flangeless inner ringand guide ring centred on theinner ring (c).When bearing bore diameter d > 65 mm:Two window-type steel cages,flangeless inner ring and guidering centred on the cages (d).

4 CAFAOne-piece machined steelcage of the double-prongedtype centred on the outer ringraceway, retaining flanges onthe inner ring and guide ringcentred on the inner ring (e).CAMAAs CAFA, but with a brass cageSpherical roller bearings704P0m= 0,01 C0whereP0m= minimum equivalent static load, kNC0= basic static load rating, kN( product tables)In some applications it is not possible toreach or exceed the requisite minimum , if the bearing is oil lubricated lowerminimum loads are permissible. These loadscan be calculated when n/nr 0,3 fromP0m= 0,003 C0and when 0,3 < n/nr 2 fromnP0m= 0,003 C0(1 + 2 0,3)nrwhereP0m= minimum equivalent static bearingload, kNC0= basic static load rating, kN( product tables)n = rotational speed, r/min nr= reference speed, r/min ( product tables)When starting up at low temperatures orwhen the lubricant is highly viscous, evengreater minimum loads than P0m= 0,01 C0may be required. The weight of the com-ponents supported by the bearing , togetherwith external forces, generally exceeds therequisite minimum load.

5 If this is not thecase, the Spherical roller bearing must besubjected to an additional radial Spherical roller bearings haveproven to give reliable operation at very lowloads. They can withstand longer periods ofinsufficient lubrication, sudden variations inload and rapid speed changes ( page 939).Influence of operating temperature on bearing materialAll SKF Spherical roller bearings undergo a special heat treatment so that they can beoperated at higher temperatures for longerperiods, without the occurrence of inadmis-sible dimensional changes. For example, a temperature of +200 C for 2 500 h, or forshort periods at even higher temperatures is load carrying capacityBecause of their special internal design, SKFspherical roller bearings are able to accom-modate heavy axial loads and even purelyaxial load carrying capacity of bearingsmounted on an adapter sleeveIf Spherical roller bearings with adapter sleevesare mounted on smooth shafts with no fixedabutment, the magnitude of the axial loadthat can be supported is determined by thefriction between the shaft and sleeve.

6 Pro-vided the bearings are correctly mounted, thepermissible axial load can be calculated fromFap= 0,003 B dwhereFap= maximum permissible axial load, kNB = bearing width, mmd = bearing bore diameter, mmMinimum loadIn order to provide satisfactory operation, Spherical roller bearings , like all ball androller bearings , must always be subjected toa given minimum load, particularly if they areto operate at high speeds or are subjectedto high accelerations or rapid changes in thedirection of load. Under such conditions theinertia forces of the rollers and cage(s), andthe friction in the lubricant, can have a detri-mental influence on the rolling conditions inthe bearing arrangement and may causedamaging sliding movements to occur be-tween the rollers and requisite minimum load to be appliedto Spherical roller bearings can be estimatedusing705 Equivalent dynamic bearing loadFor dynamically loaded Spherical roller bearingsP = Fr+Y1 Fawhen Fa/Fr eP = 0,67 Fr+Y2 Fawhen Fa/Fr> eThe values of the calculation factors e, Y1and Y2will be found in the product static bearing loadFor statically loaded Spherical roller bearingsP0= Fr+Y0 FaThe value of the calculation factor Y0will befound in the product designations The designation suffixes used to identifycertain features of SKF Spherical roller bear-ings are explained in the following.

7 The suf-fixes used to identify bearing (and cage) de-sign, CC or E, are not included here asthey are explained in the section Standardbearings on page internal clearance smallerthan NormalC3 Radial internal clearance greaterthan NormalC4 Radial internal clearance greaterthan C3C5 Radial internal clearance greaterthan C4C08 Heightened running accuracy to ISO tolerance class 5C083C08 + C3C084C08 + C42 CSSheet steel reinforced contact sealof acrylonitrile butadiene rubber(NBR) on both sides of the groove and three lubrica-tion holes in the outer ring coveredwith a polymer band. Lubricatedwith an extreme pressure bearinggrease according to tableonpage 69412CS2 Sheet steel reinforced contact sealof fluoro rubber (FPM) on bothsides of the bearing . Annulargroove and three lubricationholes in the outer ring; coveredwith a polymer band. Lubricatedwith a polyurea high temperaturegrease 2CS5 Sheet steel reinforced contactseal of hydrogenated acrylonitrilebutadiene rubber (HNBR) on bothsides of the bearing .

8 Otherwiseas 2CS2 HA3 Inner ring of case-hardening steelKTapered bore, taper 1:12K30 Tapered bore, taper 1:30P5 Dimensional and running accuracyto ISO tolerance class 5 P6 Dimensional and running accuracyto ISO tolerance class 6 P62P6+C2VA405 bearings for vibratory applicationswith surface hardened cages VA406VA405 and PTFE-coated boreVE552(E)Outer ring with three equallyspaced threaded holes in one sideface to accommodate hoistingtackle; the E indicates that appro-priate eye bolts are supplied withthe bearingsVE553(E)As VE552 but with threaded holesin both side facesVG114 Surface hardened pressed steelcageVQ424 Running accuracy better than C08VT143 Grease fill with an extreme pressure grease according to tableonpage 694 WWithout annular groove and lubri-cation holes in outer ringW20 Three lubrication holes in the outerringW26 Six lubrication holes in the innerringW33 Annular groove and three lubrica-tion holes in the outer ringW64 Solid Oil fillingW77 Plugged W33 lubrication holesW513W26+W33235220 Inner ring of case-hardened steelwith helical groove in bore1 PrincipalBasic load ratings Fatigue Speed ratingsMassDesignationsdimensionsdynamic staticloadRefer- LimitingBearing withlimitence speedcylindrical tapereddD B C C0 PuspeedboreboremmkNkNr/minkg 2052 18 49444,7513 000 17 0000,28*22205/20 E 2552 18 49444,7513 000 17 0000,26*22205 E*22205 EK62 17 41,4 41,54,558 500 12 0000,2821305 CC 3062 20 64606,411 000 14 0000.

9 29*22206 E*22206 EK72 19 55,2 616,87 500 10 0000,4121306 CC21306 CCK3572 23 86,5 859,39 000 12 0000,45*22207 E*22207 EK80 21 65,6 728,156 700 9 5000,5521307 CC21307 CCK4080 23 96,5 909,88 000 11 0000,53*22208 E*22208 EK90 23 104 10811,87 000 9 5000,75*21308 E*21308 EK90 33 150 140156 000 8 0001,05*22308 E*22308 EK4585 23 102 9810,87 500 10 0000,58*22209 E*22209 EK100 25 125 12713,75 300 7 0000,99*21309 E*21309 EK100 36 183 18319,65 300 7 0001,40*22309 E*22309 EK5090 23 104 10811,87 000 9 5000,63*22210 E*22210 EK110 27 156 16618,65 600 7 5001,35*21310 E*21310 EK110 40 220 224244 800 6 3001,90*22310 E*22310 EK55100 25 125 13713,76 300 8 0000,84*22211 E*22211 EK120 29 156 16618,65 600 7 5001,70*21311 E*21311 EK120 43 270 280304 300 5 6002,45*22311 E*22311 EK60110 28 156 16618,65 600 7 5001,15*22212 E*22212 EK130 31 212 24026,54 800 6 3002,10*21312 E*21312 EK130 46 310 33536,54 000 5 3003,10*22312 E*22312 EK65120 31 193 216244 300 7 0001,55*22213 E*22213 EK140 33 236 270294 300 6 0002,55*21313 E*21313 EK140 48 340 360383 800 5 0003,75*22313 E*22313 EK70125 31 208 22825,55 000 6 7001,55*22214 E*22214 EK150 35 285 32534,53 400 4 5003,10*21314 E*21314 EK150 51 400 430453 400 4 5004,55*22314 E*22314 EK712 Spherical roller bearingsd20 70mmDDBddrrrr121212dbK*SKF Explorer bearingCylindrical boreTapered boreDimensionsAbutment andCalculation factorsfillet dimensionsdd2D1bKr1,2daDaraeY1Y2Y0~~minm in max maxmmmm 2031,2 44,2 3,7 2 125,6 46,4 10,35 1,9 2,91,82531,2 44,2 3,7 2 130,6 46,4 10,35 1,9 2,91,835,7 50,7 1,132 5510,30 2,3 3,42,23037,7 533,7 2 135,6 56,4 10,31 2,2 3,32,243,3 58,8 1,137 6510.

10 27 2,5 3,72,53544,5 61,8 3,7 2 1,142 6510,31 2,2 3,32,247,2 65,6 1,544 711,50,28 2,4 3,62,54049,6 69,4 5,5 3 1,147 7310,28 2,4 3,62,559,9 79 1,549 811,50,24 2,8 4,22,849,9 74,3 5,5 3 1,549 811,50,37 1,8 2,71,84554,9 74,4 5,5 3 1,152 7810,26 2,6 3,92,565,3 87,9 5,5 3 1,554 911,50,24 2,8 4,22,857,6 83,1 5,5 3 1,554 911,50,37 1,8 2,71,85059,9 795,5 3 1,157 8310,24 2,8 4,22,872,6 965,5 3 261 9920,24 2,8 4,22,863,9 91,9 5,5 3 261 9920,37 1,8 2,71,85565,3 87,9 5,5 3 1,564 911,50,24 2,8 4,22,872,6 965,5 3 266 109 20,24 2,8 4,22,870,1 102 5,5 3 266 109 20,35 1,9 2,91,86072,6 96,3 5,5 3 1,569 101 1,50,24 2,8 4,22,887,8 115 5,5 3 2,172 118 20,22 34,62,877,9 110 5,5 4,5 2,172 118 20,35 1,9 2,91,86580106 5,5 3 1,574 111 1,50,24 2,8 4,22,894,7 124 5,5 3 2,177 128 20,22 34,62,881,6 118 8,3 4,5 2,177 128 20,35 1,9 2,91,87083111 5,5 3 1,579 116 1,50,22 34,62,8101 133 5,5 3 2,182 138 20,22 34,62,890,3 128 8,3 4,5 2,182 138 20,33 232713 DdraraaaPrincipalBasic load ratings Fatigue Speed ratingsMassDesignationsdimensionsdynamic staticloadRefer- LimitingBearing withlimitence speedcylindrical tapereddD B C C0 PuspeedboreboremmkNkNr/minkg 75115 40 17323228,5 3 800 5 300 1,55*24015 CC/W33 130 31 21224026,5 4 800 6 300 1,70*22215 E*22215 EK160 37 28532534,5 4 000 5 600 3,75*21315 E*21315 EK160 55 440475483 200 4 300 5,55*22315 E*22315 EK80140 33 236270294 300 6 000 2,10*22216 E*22216 EK170 39 325375393 800 5 300 4,45*21316 E*21316 EK170 58 490540543 000 4 000 6.