The Design of Rolling Bearing Mountings

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Current insulationWhere converter current motors with an output ofmore than 100 kW are used, ripple voltages can becaused by magnetic asymmetries. As a result, an inducedcircuit is generated between rotor shaft and statorwhich can cause current passage damage in thebearing.To interrupt the flow of current, one bearing (in thiscase the deep groove ball bearing) is provided with currentinsulation.Current-insulated bearings feature an oxide ceramiccoating on the outer ring O.D.s and faces.Ventilation endDrive end2: Traction motor of an electric commuter train9 FAG
3 Three-phase current standard motorOperating dataBelt drive: Power 3 kW; rotor mass 8 kg; nominalspeed 2,800 min –1 ; size 100 L; totally enclosed fancooledaccording to DIN 42673, sheet 1 – design B3,type of protection IP44, insulation class F.Bearing selectionLow-noise bearings in a simple, maintenance-freearrangement should be provided. These requirementsare best met by deep groove ball bearings.In DIN 42673, the shaft-end diameter specified forsize 100 L is 28 mm. Consequently, a bore diameter of30 mm is required. In this case a bearing of series 62was selected for both bearing locations, i.e. an FAG6206.2ZR.C3.L207. They guide the rotor shaft bothat the drive side and at the ventilating side. The springat the drive side provides clearance-free adjustment ofthe bearings and accommodates opposing axial loadson the rotor shaft.By adjusting the deep groove ball bearings to zeroclearance the adverse influence of bearing clearance onnoise behaviour is eliminated.Bearing dimensioningThe calculation of the bearings for this motor differssomewhat from the usual approach. As not even themotor manufacturer knows the amount of load at theshaft end, the permissible radial loading is indicated inthe motor catalogues.To determine the radial load carrying capacity, thedrive-side deep groove ball bearing is calculated.The calculation is based on an attainable life L hna of20,000 h and a basic a 23II value of 1.5. In addition, therotor weight, the unilateral magnetic pull and theunbalanced load have to be taken into account. As theDrive endlatter two criteria are not known the rotor weight issimply multiplied by a supplementary factor off z = 1.5.With these values a permissible radial loading of 1 kNis calculated for the shaft-end middle.Since the operating load in most applications is lowerthan the admissible load, an attainable life L hna of morethan 20,000 hours is obtained. The life of electric motorbearings, therefore, is usually defined not by materialfatigue but by the grease service life.Suffixes.2ZRC3L207Bearing with two shieldsRadial clearance larger than PN (normal)Grease filling with Arcanol L207Machining tolerancesShaft to j5; end cap bore to H6.The bore tolerance H6 ensures the slide fit required forfree axial adjustment of both bearings.Lubrication, sealingThe .2ZR design with shields on both bearing sideshas been successful in small and medium-sized electricmotors. The grease filling in these bearings is sufficientfor their entire service life. Increased operating temperaturesmust be taken into consideration in the case inquestion due to the insulation class F provided. Forthis reason the FAG high-temperature grease ArcanolL207 is used. The shields prevent the grease from escapingand protect the bearings from contaminationfrom the motor. Gap type seals protect the shaft openingat the drive side against dust and moisture. The requirementson insulation type IP44 are, therefore,met.Ventilation end3: Three-phase current standard motorFAG 10
Page 3: PrefaceThis publication presents de
Page 6 and 7: ContentsExample Title . . . . . . .
Page 8 and 9: assembly is contracted. Thus the ra
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 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
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40 Water pump for passenger car and
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42 Axle box roller bearings of an I
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43-44 UIC axle box roller bearings
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45Axle box roller bearingsof series
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47Axle box roller bearingsof the Ch
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48 Axle box roller bearings for an
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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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