The Design of Rolling Bearing Mountings

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The effects of basing the bearing dimensions on attainablelife become evident in the case of the two bearingsdimensioned for the least load carrying capacity: thespherical roller bearing 23248B.MB (bearing location3) at the coupling end of the input shaft and the sphericalroller thrust bearing 29464E (bearing location 9)at the output end of the output shaft.Based on the index of dynamic stressing f L a nominal lifeL h = 49,900 h is calculated for spherical roller bearing3 and L h = 43,300 h for spherical roller thrust bearing9. Due to the required minimum life of 40,000 h thetransmission bearings would thus be sufficiently dimensioned.28: Bearing arrangement of a marine gear43 FAG
Attainable lifeThe actually attainable life L hna is considerably longerthan the nominal life L h .L hna = a 1 · a 23 · L h is calculated with the following data:Nominal viscosity of the oil: 40 = 100 mm 2 /sOperating temperature: t = 50 °COperating viscosity: = 58 mm 2 /sSpherical roller bearing 23248B (no. 3):C = 2,450 kN; C 0 = 4,250 kN; n = 750 min –1 ;d m = (440 + 240)/2 = 340 mmRated viscosity: 1 = 9.2 mm 2 /sViscosity ratio: / 1 = 6.3Spherical roller thrust bearing 29464E (no. 9):C = 4,300 kN; C 0 = 15,600 kN; n = 209 min –1 ;d m = (580 + 320)/2 = 450 mmRated viscosity: 1 = 23 mm 2 /sViscosity ratio: = / 1 = 2.5A stress index f s* = C 0 /P 0* > 14 is obtained for bothbearings; consequently, K 1 = 1 and K 2 = 1; therefore,K = 1 + 1 = 2.From the viscosity ratio and the factor K the followingbasic factors are obtained:– for the radial spherical roller bearing a 23II = 3.8– for the spherical roller thrust bearing a 23II = 2.9Factor a 23 is obtained from a 23 = a 23II · s.The cleanliness factor s is determined on the basis of thecontamination factor V. Both bearings operate underutmost cleanliness conditions (V = 0.3). Cleanliness isutmost if the particle sizes and filtration ratios of contaminationfactor V = 0.3 are not exceeded.Taking into account the viscosity ratio and the stressindex f s* , a cleanliness factor of s > 30 and consequentlyan a 23 factor = a 23II · s > 114 and > 87, respectively, isobtained for the bearings under consideration. Theattainable life is in the endurance strength range.This means that smaller bearings could be provided forbearing locations 3, 5, 7 and 9 to accommodate thesame shaft diameter (see table: 3 new, 5 new, 7 new, 9new) and would, in spite of the now higher bearingloads, still be in the endurance strength range.Machining tolerancesAs all bearing inner rings in this application are subjectedto circumferential load they are fitted tightlyonto the shaft seats:– Radial bearings to n6– Thrust bearings to k6.If the radial bearing outer rings are subjected to pointload, the bearing seats in the housings are machined toH7.As the spherical roller thrust bearings are to accommodateexclusively thrust loads they are fitted with clearance,i.e. radially relieved, into the housing seats whichare machined to E8.Lubrication, sealingTo meet the high requirements on safety and reliability,adequate lubrication and cleanliness conditions areprovided for marine gears. The circulating oil ISO VG100, which is used to lubricate both gear wheels androlling bearings, is cooled and directly fed to the bearings.By-pass filters with filter condition indicators andwith an adequate filtration ratio ensure an oil conditionwhere no particles bigger than 75 µm are foundand where, consequently, cleanliness is usually utmost(contamination factor V = 0.3).For this reason, the oil cleanliness class should be14/11 or 15/12 (ISO 4406).Radial shaft seals protect the transmission from contamination.FAG 44
Page 3: PrefaceThis publication presents de
Page 6 and 7: ContentsExample Title . . . . . . .
Page 8 and 9: assembly is contracted. Thus the ra
Page 10 and 11: Current insulationWhere converter c
Page 12 and 13: 4 Electric motor for domestic appli
Page 14 and 15: PulleyDrum5: Drum mounting of a dom
Page 16 and 17: 6: Rotor bearing arrangement of a v
Page 18: 7: Rotor bearing arrangement of a m
Page 21 and 22: 9-18 Work spindles of machine tools
Page 23 and 24: 10 NC-lathe main spindleOperating d
Page 26 and 27: 13 High-speed motor milling spindle
Page 28 and 29: 15 Vertical high-speed milling spin
Page 30 and 31: 17 External cylindrical grinding sp
Page 32 and 33: 19 Rotary table of a vertical lathe
Page 34 and 35: 21 Rough-turning lathe for round ba
Page 36 and 37: 22: Flywheel bearing arrangement of
Page 38 and 39: 24 Double-shaft circular sawOperati
Page 40 and 41: Rollbending bearingsA counterbendin
Page 42 and 43: 27 Spur gear transmission for a rev
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
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68 Dryer rollsThe remaining water i
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69 Guide rollsGuide rolls guide, as
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70 Calender thermo rollsThe paper p
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71 Anti-deflection rollsAnti-deflec
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73 Run wheel of a material ropewayO
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74 Rope return sheaves of a passeng
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75 Rope sheave (underground mining)
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76 Rope sheave of a pulley blockIn
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77 Crane pillar mounting with a sph
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79 Roller track assemblyThe radial
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80 Crane run wheelOperating dataWhe
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81 Crane hookThe load suspended fro
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83 Head pulley of a belt conveyorOn
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Internal bearings for the tension/8
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Belt conveyor idlersMany industries
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87 Bucket wheel shaft of a bucket w
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89 Drive unit of a finished goods e
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91 Vibrating road rollerThe vibrati
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92 Double toggle jaw crusherDouble
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94 Double-shaft hammer crusherDoubl
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95 Ball tube millTube mills are mos
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96 Support roller of a rotary kilnR
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Vibrating machinesVibrating screens
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98 Two-bearing screen with straight
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99 Four-bearing screenThe vibration
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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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