The Design of Rolling Bearing Mountings

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21 Rough-turning lathe for round bars and pipesRough-turning lathes are used for particularly economicalproduction of bars and pipes to tolerance classh9 with a wide range of diameters. In this process, thestationary round stock is moved against rotating lathetools at a certain feed rate. In this machine four cuttingtool carriages are attached to the circumference of theturrethead which are radially adjustable.Operating dataInput power 75 kW; speed n = 300...3,600 min –1 ;material O.D. 11...85 mm; feed rate 1...40 m/min.Bearing selectionThe main bearing arrangement is formed by two spindlebearings FAG B7036E.T.P4S.UL and accommodatesthe cutting forces transmitted by the four cuttingtools. The bearings are mounted in O arrangement andpreloaded with 14.5 kN (2 % of C 0 /Y 0 ) by means ofsprings.C 0 static load ratingY 0 thrust factor (static loading)Two angular contact ball bearings FAG71848MP.P5.UL in O arrangement accommodate theguiding loads from the axially displaceable hollowcone in which the four tool carriages are radiallyguided and adjusted.These bearings are also adjusted against each otherwith a spring preload of 5 kN (1 % of C 0 /Y 0 ).Experience shows that with these preloads no slippagedamage results, even if the rough-turning lathe isslowed down from 3,600 min –1 to zero within asecond.Machining tolerancesThe inner rings of both bearings are subjected to circumferentialloads and are fitted with a tolerance ofjs5.The bearing seats for the outer rings are machinedto G6. The spring preload remains effective in all operatingconditions as the expansion of the rotating partsdue to the effects of heat and centrifugal force do notcause jamming of the outer rings in the housing.Lubrication, sealingThe bearings are lubricated by oil injection lubricationwith ISO VG 32 (32 mm 2 /s at 40 °C). At 80 °C the oilhas an operating viscosity of = 8 mm 2 /s.An elaborate labyrinth seal protects the bearings fromthe ingress of cutting fluid and chips (rubbed-off particles)and from oil escape.21: Bearing arrangement of a rough-turning lathe for round bars and pipes33 FAG
22 Flywheel of a car body pressOperating dataInput power 33 kW; flywheel speed 370 min –1 ; radialload from flywheel weight and belt pull approximately26 kN.Bearing selectionBoth rings must be tightly fitted to their mating partsdue to the heavy loads and the circumferential load onthe outer ring. Nevertheless, mounting and dismountingshould be simple. These requirements can be metwith cylindrical roller bearings. They feature a highload carrying capacity, and they are separable, i.e. innerand outer rings can be mounted separately.The flywheel is supported on the hollow trunnion protrudingfrom the press frame by two cylindrical rollerbearings FAG NU1048M1A. The suffix M1A indicatesthat the bearings are fitted with an outer ring ridingmachined brass cage. Two angle rings HJ1048, oneat each of the outer sides of the cylindrical roller bearings,are provided for axial location of the flywheel.Spacer J is arranged between the bearing inner ringsand spacer A between the outer rings. Spacer J is0.6 +0.2 mm longer than spacer A, which ensures adequateaxial clearance. After the bearing has beenmounted, the axial clearance is checked (minimum0.4 mm).Bearing dimensioningThe trunnion diameter, which is determined by thedesign, determines in turn the bearing size.Machining tolerancesThe outer rings are subjected to circumferential loadand therefore require tight fits; the hub bore ismachined to M6. The inner rings are point-loaded. Thetrunnion is machined to j5.Bearing clearanceCalculations show that the radial clearance is reducedafter mounting, due to outer ring contraction andinner ring expansion (probable interference), by only20 µm from the value measurable prior to mounting(value indicated in table). Bearings of normal radialclearance (CN = 110...175 µm) can, therefore, be used.Lubrication, sealingGrease lubrication (FAG rolling bearing grease ArcanolL71V).Shaft seals prevent the ingress of dirt.FAG 34
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 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
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
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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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