The Design of Rolling Bearing Mountings

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LubricationThe bearing housings are connected to a central oil circulationlubrication system so that heat is constantlydissipated from the bearing. High-grade mineral oilsISO VG 220 or 320 are used which must have a highoperating viscosity, thermal stability, good protectionagainst wear, good water separation ability and a highdegree of cleanliness. A minimum oil quantity of 1.6l/min is guided directly to the centre of the bearing viaa lubricating groove and lubricating holes in the outerring.The oil can be carried off at both sides of the bearingwith the central oil system. The danger of oil retentionand leakage is minimized considerably. Any contaminantsor wear particles which might penetrate thebearing are immediately washed out of it with thismethod of lubrication.SealingGap-tape seals, which are non-rubbing and maintenance-free,are provided as sealing for the journal passages.The oil is thrown off via splash grooves and oilcollecting chambers and flows back through returnholes to the two oil cavities on the housing floor. Coverseals make the housing of the paper machine oil proof.Locating bearingFloating bearing68: Dryer roll bearings95 FAG
69 Guide rollsGuide rolls guide, as the name indicates, and turn thewire and felt cloth in the wet end and dryer sections ofa paper machine. The same bearings are used for theguide rolls in both areas. Lubrication and sealing differ,however, depending on the place of application.In older machines the wet end section is usually lubricatedwith grease, and the dryer section with oil.In modern machines both sections have oil circulationlubrication. Due to different operating conditionsseparate oil circuits are necessary for the wet end anddryer sections.The larger the machine the more often it is found tobe faster. For this reason the bearing inner rings aremounted with a tapered bore directly on the taperedroll journal.Wet end sectionDepending on the positions of the bearings in the machinethey are subject to a small or large degree ofmoisture. Water must not penetrate the housing particularlywhen machines are being high-pressurecleaned.Dryer sectionEnvironmental temperatures of about 95 °C lead togreat length variations and place high demands onlubrication. The operating temperature of the bearingscan be 115 °C.Operating dataUseful width 8,800 mmRoll diameter 700 mmPaper speed 1,650 m/min (n = 750 min –1 )Roll weight F G ≈ 80 kNPaper pull 1 kN/m (tensile load F z ≈ 9 kN)Wrap angle 180°Bearing temperature approx. 105 °CBearing selection, dimensioningThe bearings must be able to accommodate loads andcompensate for misalignment at the same time (misalignment,bending). An increased radial clearanceaccording to C3 is necessary due to temperature differences.Spherical roller bearings FAG 22330EK.C3 aremounted.Bearing load:P = (F G + F z )/2 = (80 + 9)/2 = 44.5 kNThe diameter of the roll journal is determined by theroll rigidity required. As a result there is a high index ofdynamic stressing f L corresponding to a nominal life L hof well over 200,000 hours. The attainable life is evenhigher with such good lubrication conditions.The housings can be in standing or suspended positionor can be laterally screwed on. They are designed foroil circulation lubrication.Machining tolerancesThe inner rings have circumferential load and are directlyfitted to the tapered roll journal. The roll journalhave oil ducts so the bearings can be mounted and dismountedwith the hydraulic method.Roundness tolerance IT5/2 (DIN ISO 1101); taperangle tolerance AT7 (DIN 7178).Bearing seats in the housing bore according to G7.LubricationIn the dryer section: see example 68 (Dryer rolls) sincethe bearings are connected to the oil circuit of thedryer rolls. Minimum flow rate 0.9 l/min.In the wet end section: see example 66 (Suction rolls)and 67 (Central press rolls), since the bearings are connectedto the oil circuit of the wet section rolls.Minimum flow rate 0.5 l/min.SealingGap-type seals, which are non-rubbing and maintenance-free,prevent oil from escaping through the coverpassages in the dryer section.The bearings in the wet end section must have relubricatablelabyrinth seals to prevent water from penetrating.Remaining oil is thrown off by splash grooves intocollecting chambers and directed back. Cover sealsmake the housing oilproof.FAG 96
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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
Page 46 and 47: 29 Bevel gear - spur gear transmiss
Page 48 and 49: 31 Worm gear pairOperating dataInpu
Page 50 and 51: at least normal cleanliness (contam
Page 52 and 53: 33 Manual gearbox for trucksOperati
Page 54: 34 Final drive of a passenger carOp
Page 57 and 58: Driven and non-steered rear wheel36
Page 59 and 60: 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: 68 Dryer rollsThe remaining water i
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 and 112: 77 Crane pillar mounting with a sph
Page 113 and 114: 79 Roller track assemblyThe radial
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
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104Roll bearings of afour-high cold
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Work rolls for the finishing sectio
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107 Combined reduction and cogging
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108 Work rolls of a section millThe
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Two-high rolls of a dressing stand1
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110 Straightening rolls of a rail s
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111 Disk ploughIn a disk plough the
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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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