The Design of Rolling Bearing Mountings

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Crane pillar mounting with a spherical roller thrust bearing78 and a spherical roller bearingOperating dataThrust load (crane superstructure and payload) F a =1,700 kN; radial load (reaction forces resulting fromtilting moment and wind pressure) F r = 1,070 kN;speed n = 1 min –1 .Bearing selection, dimensioningIn this case F r /F a > 0.55. The radial load is relativelyhigh. Therefore, it is accommodated by an additionalradial bearing, a spherical roller bearing. The two bearingsare mounted so that their pivoting centres coincide.Thus angular alignability is ensured. A thrustwasher inserted between the two bearings prevents excessiveradial loading on the thrust bearing. The sphericalroller bearing size depends on that of the sphericalroller thrust bearing. The outside diameter of theradial bearing must be larger than the housing washerof the thrust bearing. To ensure close guidance of thecrane superstructure, the reduced radial clearance C2 isprovided for the radial bearing.Crane pillar mountings with one spherical roller bearingand one spherical roller thrust bearing providecompact designs. They require, however, a widermounting space than mountings with one singlespherical roller thrust bearing.The mounting features a spherical roller thrust bearingFAG 29440E with the static load rating C 0 = 8,500 kNand a spherical roller bearing FAG 23056B.MB.C2with the static load rating C 0 = 3,000 kN.For calculating the equivalent static load for the sphericalroller thrust bearing it is assumed that the frictionat the thrust washer, acting as a radial load, is 150 kN.Thus F r /F a < 0.55 for the spherical roller thrust bearing.Equivalent static load:P 0 = F a + X 0 · F r = F a + 2.7 · F r for F r ≤ 0.55 F a= 1,700 + 2.7 · 150 = 2,100 kNFor the spherical roller bearing:P 0 = F r = 1,070 kNHence the indices of static stressing f s = C 0 / P 0 are:Spherical roller thrust bearing = 8,500 / 2,100 = 4.05Spherical roller bearing = 3,000 / 1,070 = 2.8These values show that the bearings are safely dimensioned.The shaft washer and housing washer of spherical rollerthrust bearings with f s values of ≥ 4...≤ 6 must befully supported axially; good radial support of thehousing washer is also required.Machining tolerancesSpherical roller thrust bearing:Shaft washer to j6,housing washer to K7Spherical roller bearing:shaft to j6; housing to J7Lubrication, sealingThe bearing housing is filled with oil beyond the upperedge of the spherical roller bearing, i.e. the bearingsrun in an oil bath. Thus they are well protected againstcondensation water and corrosion.Outer sealing is provided by labyrinths. In view of theadverse ambient conditions an additional, rubbing sealwith elastic lip is provided. Inner sealing is effected bythe tube communicating with the housing, and a labyrinth.Thrust washer78: Crane pillar mounting with a spherical roller thrust bearing and a spherical roller bearing111 FAG
79 Roller track assemblyThe radial bearing mounting at the pillar foot consistsnormally of several rollers travelling on a circular track.Each of these rollers is supported by two bearings, theupper bearing being the locating bearing, the lower onethe floating bearing.f s = C 0 /P 0 = 1,630 / 1,100 = 1.48is calculated.This value meets the requirements for smooth runningof the bearing.Operating dataThe maximum load on one roller is 2,200 kN. Thus,each bearing is loaded with P 0 = 1,100 kN.Machining tolerancesThe inner rings carry circumferential load and are fittedtightly.Shaft to k6; housing to H7.Bearing selection, dimensioningThe rollers transmit only the horizontal loads resultingfrom the tilting moment. To cater for the misalignmentconditions inherent in structural steelwork andfor wheel axle deflection, self-aligning bearings have tobe provided.Spherical roller bearings FAG 23230ES.TVPB withstatic load rating C 0 = 1,630 kN are mounted.With an equivalent static load P 0 = 1,100 kN an indexof static stressingLubrication, sealingThe bearings and housing cavities are packed to capacitywith a lithium soap base grease with EP additives(FAG rolling bearing grease Arcanol L186V). Relubricationis possible through lubricating nipples in thehousing cover.Outer sealing is provided by the housing cover, innersealing by a shaft seal ring. A flinger ring between rollerand lower bearing additionally protects the lowershaft seal ring against dirt and rubbed-off particles.79: Roller-track assemblyFAG 112
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PrefaceThis publication presents de
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ContentsExample Title . . . . . . .
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assembly is contracted. Thus the ra
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Current insulationWhere converter c
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4 Electric motor for domestic appli
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PulleyDrum5: Drum mounting of a dom
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6: Rotor bearing arrangement of a v
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7: Rotor bearing arrangement of a m
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9-18 Work spindles of machine tools
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10 NC-lathe main spindleOperating d
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13 High-speed motor milling spindle
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15 Vertical high-speed milling spin
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17 External cylindrical grinding sp
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19 Rotary table of a vertical lathe
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21 Rough-turning lathe for round ba
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22: Flywheel bearing arrangement of
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24 Double-shaft circular sawOperati
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Rollbending bearingsA counterbendin
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27 Spur gear transmission for a rev
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The effects of basing the bearing d
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29 Bevel gear - spur gear transmiss
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31 Worm gear pairOperating dataInpu
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at least normal cleanliness (contam
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33 Manual gearbox for trucksOperati
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34 Final drive of a passenger carOp
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Driven and non-steered rear wheel36
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38 Steering king pin of a truckA va
Page 61 and 62: 40 Water pump for passenger car and
Page 63 and 64: 42 Axle box roller bearings of an I
Page 65 and 66: 43-44 UIC axle box roller bearings
Page 67 and 68: 45Axle box roller bearingsof series
Page 69 and 70: 47Axle box roller bearingsof the Ch
Page 71 and 72: 48 Axle box roller bearings for an
Page 73 and 74: 50Axle box roller bearingsaccording
Page 75 and 76: 52Universal quill drivefor threepha
Page 77 and 78: 54 Spur gear transmission for the u
Page 79 and 80: 55 Bevel gear transmission for city
Page 81 and 82: 56- 57 Spherical roller bearings as
Page 83 and 84: 60 Spade-type rudderDesignThe slewi
Page 85 and 86: 61-62 Ship shaft bearings and stern
Page 87 and 88: 63-64 Ship shaft thrust blocksThe t
Page 89 and 90: 64a: Complete ship shaft thrust blo
Page 91 and 92: 65 RefinersWood chips from the wood
Page 93 and 94: 66 Suction rollsSuction rolls are f
Page 95 and 96: 68 Dryer rollsThe remaining water i
Page 97 and 98: 69 Guide rollsGuide rolls guide, as
Page 99 and 100: 70 Calender thermo rollsThe paper p
Page 101 and 102: 71 Anti-deflection rollsAnti-deflec
Page 103 and 104: 73 Run wheel of a material ropewayO
Page 105 and 106: 74 Rope return sheaves of a passeng
Page 107 and 108: 75 Rope sheave (underground mining)
Page 109 and 110: 76 Rope sheave of a pulley blockIn
Page 111: 77 Crane pillar mounting with a sph
Page 115 and 116: 80 Crane run wheelOperating dataWhe
Page 117 and 118: 81 Crane hookThe load suspended fro
Page 119 and 120: 83 Head pulley of a belt conveyorOn
Page 121 and 122: Internal bearings for the tension/8
Page 123 and 124: Belt conveyor idlersMany industries
Page 125 and 126: 87 Bucket wheel shaft of a bucket w
Page 127 and 128: 89 Drive unit of a finished goods e
Page 129 and 130: 91 Vibrating road rollerThe vibrati
Page 131 and 132: 92 Double toggle jaw crusherDouble
Page 133 and 134: 94 Double-shaft hammer crusherDoubl
Page 135 and 136: 95 Ball tube millTube mills are mos
Page 137 and 138: 96 Support roller of a rotary kilnR
Page 139 and 140: Vibrating machinesVibrating screens
Page 141 and 142: 98 Two-bearing screen with straight
Page 143 and 144: 99 Four-bearing screenThe vibration
Page 145 and 146: 101-103 Large capacity convertersCo
Page 147 and 148: 104Roll bearings of afour-high cold
Page 149 and 150: Work rolls for the finishing sectio
Page 151 and 152: 107 Combined reduction and cogging
Page 153 and 154: 108 Work rolls of a section millThe
Page 155 and 156: Two-high rolls of a dressing stand1
Page 157 and 158: 110 Straightening rolls of a rail s
Page 159 and 160: 111 Disk ploughIn a disk plough the
Page 161 and 162: 112 Plane sifterSifters are used in
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Printing pressesPrinting quality is
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114 Blanket cylinder of a sheet-fed
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116 Axial piston machineCylinder bl
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117 Axial piston machineOperating d
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119 Hot gas fanGas temperature 150
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121 Optical telescopeOperating data
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122-124 RadiotelescopeFor radioastr
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123 Azimuth axis (track roller and
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GlossaryAdditivesAdditives are oil-
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GlossaryAxial clearanceThe axial cl
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GlossaryContamination factor VThe c
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GlossaryEP additivesWear-reducing a
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Glossary1. Safe retention and unifo
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GlossaryLoad angleThe load angle i
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Glossaryload and the ring to be fit
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Glossaryaligning ball bearings, bar
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GlossaryViscosityViscosity is the m
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NotesFAG 196
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The Design of Rolling Bearing Mountings

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