The Design of Rolling Bearing Mountings

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13 High-speed motor milling spindleOperating dataInput power 11 kW;maximum spindle speed 28,000 min –1 .Bearing selectionThe bearings must be suitable for very high speeds andfor the specific thermal operating conditions in a motorspindle. Hybrid spindle bearings with ceramic ballsare particularly suitable for this application.Milling spindles must be guided extremely accuratelyboth in the axial and in the radial direction.Work end:1 spindle bearing set FAG HC7008E.T.P4S.DTL intandem arrangement.Drive end:1 spindle bearing set FAG HC71908E.T.P4S.DTL intandem arrangement.The bearing pairs at drive end and work end aremounted in O arrangement and elastically adjusted bymeans of springs (spring load 300 N), correspondingto a medium preload. The bearing pair at the drive endis mounted on a sleeve which is supported on a linearball bearing with zero clearance so that axial lengthvariations of the shaft can be freely compensated for.Bearing dimensioningBearing size and bearing arrangement are selected onthe basis of the specified speed and on the spindlediameter.Two other factors that have to be taken into accountare the heat generated by the motor, which causes amajor temperature difference between the inner ringand the outer ring of the bearing, and the ring expansionwhich makes itself felt by the centrifugal force resultingfrom the high speed. In a rigid bearing arrangement,this would considerably increase the preload.Due to the spring preload, both these influences areeasily compensated for. As a result, the contact pressurein the rolling contact area of the bearing is relativelylow (p 0 ≤ 2,000 N/mm 2 ), and the bearings arefailsafe. Consequently, the service life of the bearings isdictated by the grease service life.Lubrication, sealingThe bearings are lubricated with rolling bearing greaseArcanol L207V which is particularly suitable for thegreater thermal stressing and for high speeds.To protect the grease from contamination, and consequentlyto increase the grease service life, the bearingsare sealed by labyrinths consisting of a gap-type sealwith flinger grooves and a collecting groove.Machining tolerancesBearing Seat Diameter Form tolerance Axial runout tolerancetolerance (DIN ISO 1101) of abutment shoulderSpindle bearing Shaft +6/+10 µm 1 µm 1.5 µm(drive/work end) Housing –3/+5 µm 2 µm 3 µm13: Bearing arrangement of a high-speed motor milling spindle25 FAG
14 Motor spindle of a latheOperating dataInput power 18 kW;maximum spindle speed 4,400 min –1 .obtained whose load carrying capacity is more thanadequate.Consequently, the service life of the bearings is primarilydictated by the grease service life.Bearing selectionThe bearings must be very rigid and accurately guidethe spindle in the radial and axial direction. This isachieved by selecting as large a shaft diameter as possibleand a suitable bearing arrangement. The bearingsare preloaded and have an increased precision. Also,the specific thermal conditions found in a motor bearingarrangement have to be taken into account.Work end: 1 spindle bearing setFAG B7024E.T.P4S.QBCL(tandem-O-tandem arrangement )as locating bearingOpposite end: 1 cylindrical roller bearingFAG N1020K.M1.SPas floating bearing.Bearing dimensioningAs the bearing size primarily depends on the spindlerigidity (larger spindle diameter) bearing sizes areBearing clearanceThe spindle bearings are mounted with a light preload.The cylindrical roller bearing is adjusted to a radialclearance of a few µm by axially pressing the taperedinner ring onto the tapered shaft seat and reaches therequired zero clearance at operating temperature.Lubrication, sealingThe bearings are lubricated for life with the rollingbearing grease Arcanol L207V. This grease is particularlysuitable for increased temperatures and high speeds.Approximately 35 % of the spindle bearing cavity andapproximately 20 % of the cylindrical-roller bearingcavity is filled with grease.Sealing is provided by a stepped labyrinth with collectinggrooves and drain holes. A gap-type seal protectsthe cylindrical roller bearing from external contamination.Machining tolerancesBearing Seat Diameter Form tolerance Axial runout tolerancetolerance (DIN ISO 1101) of abutment shoulderSpindle bearing Shaft –5/+5 µm 1.5 µm 2.5 µmHousing –4/+10 µm 3.5 µm 5 µmCylindrical roller bearing Shaft, tapered 1:12 1.5 µm 2.5 µmHousing –15/+3 µm 3.5 µm 5 µm14: Motor spindle bearing arrangement of a latheFAG 26
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 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 44 and 45: 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
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52Universal quill drivefor threepha
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54 Spur gear transmission for the u
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55 Bevel gear transmission for city
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56- 57 Spherical roller bearings as
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60 Spade-type rudderDesignThe slewi
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61-62 Ship shaft bearings and stern
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63-64 Ship shaft thrust blocksThe t
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64a: Complete ship shaft thrust blo
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65 RefinersWood chips from the wood
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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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