The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
ContentsExample Title . . . . . . . . . . . . . . . . . . . . . . . . . . . .PagePRINTING PRESSES113 Impression cylinders of a newspaperrotary printing press . . . . . . . . . . . . . . . . 162114 Blanket cylinder of a sheet-fed offsetpress . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164PUMPS115 Centrifugal pump . . . . . . . . . . . . . . . . . . 165116-117 Axial piston machines . . . . . . . . . . . . . . . 166VENTILATORS, COMPRESSORS,FANS118 Exhauster . . . . . . . . . . . . . . . . . . . . . . . . 169119 Hot gas fan . . . . . . . . . . . . . . . . . . . . . . . 170120 Fresh air blower . . . . . . . . . . . . . . . . . . . . 171PRECISION MECHANICS,OPTICS, ANTENNAS121 Optical telescope . . . . . . . . . . . . . . . . . . 172Radiotelescope . . . . . . . . . . . . . . . . . . . . 174122 Elevation axle . . . . . . . . . . . . . . . . . . . . . 175123 Azimuth axis (track roller and kingpin bearings) . . . . . . . . . . . . . . . . . . . . . . 176124 Data wheel . . . . . . . . . . . . . . . . . . . . . . . 177GLOSSARY . . . . . . . . . . . . . . . . . . . . . 1785 FAG
1 Traction motor for electric standard-gauge locomotivesOperating dataThree-phase current motor supplied by frequencyconverter.Nominal output 1,400 kW, maximum speed4,300 min –1 (maximum driving speed for transmissionswith standard gear ratios is 200 km/h). One-enddrive with herringbone gear pinion.Bearing selection, dimensioningCollective loads which cover representative load casesfor the motor torque, speeds, and percentages of timefor the operating conditions in question, are used todetermine bearing stressing.Load case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .M d n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .qN m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .min –1 %1 6,720 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1,056 22 2,240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1,690 343 1,920 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,324 184 3,200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,746 425 2,240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,225 6The collective load is the basis for determining theaverage speeds (2,387 min –1 ) and the average drivingspeed (111 km/h). For each of the load cases the toothload acting on the pinion and the reaction loads fromthe bearings have to be calculated both for forward andbackward motion (percentage times 50 % each).In addition to these forces, the bearings are subjectedto loads due to the rotor weight, the unbalanced magneticpull, unbalanced loads and rail shocks. Of theseloads only the rotor weight, G L , is known; therefore, itis multiplied by a supplementary factor f z = 1.5...2.5 –depending on the type of motor suspension. The bearingloads are determined from this estimated load. Forthe spring-suspended traction motor shown, a supplementaryfactor f z = 1.5 is used.The bearing loads from weight and drive allow the resultantbearing loading to be determined by vectoraddition. In this example only the critical transmission-endbearing will be discussed. The attainable lifeL hna1...5 is determined for every load case using the formulaL hna = a 1 · a 23 · L h [h], taking into account theoperating viscosity of the transmission oil at 120 °C,the rated viscosity 1 as well as the factors K 1 and K 2 .The basic a 23II factor is between 0.8 and 3. The cleanlinessfactor s is assumed to be 1. Then, L hna is obtainedusing the formula:L hna =100q 1 q + 2L hna1 L hna2q + 3L hna3+ ...When selecting the bearing it should be ensured thatthe nominal mileage is reached and that, due to thehigh speed, the drive-end bearing is not too large.With the bearings selected the theoretical mileage of2.5 million kilometers required by the customer can bereached.A cylindrical roller bearing FAG NU322E.TVP2.C5.F1serves as floating bearing at the drive end; an FAG566513 with an angle ring HJ318E.F1 serves as thelocating bearing.The cylindrical roller bearing FAG 566513 is anNJ318E.TVP2.P64.F1, but its inner ring is 6 mmwider. The resulting axial clearance of 6 mm is requiredin order to allow the herringbone gearing on thepinion to align freely.Suffixes:ETVP2C5F1P64reinforced designmoulded cage of glass fibre reinforcedpolyamide, rolling element ridingradial clearance larger than C4FAG manufacturing and inspectionspecification for cylindrical roller bearings intraction motors which considers, amongothers, the requirements according to DIN43283 "Cylindrical roller bearings forelectric traction".tolerance class P6, radial clearance C4Machining tolerancesDrive end: shaft r5; end cap to M6Opposite end: shaft n5; end cap to M6The bearings are fitted tightly on the shaft due to thehigh load, which is sometimes of the shock type. Thisreduces the danger of fretting corrosion, particularly atthe drive end.Bearing clearanceDue to the tight fits, the inner ring of the bearing isexpanded and the outer ring with the roller-and-cageFAG 6
- Page 3: PrefaceThis publication presents de
- 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 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
ContentsExample Title . . . . . . . . . . . . . . . . . . . . . . . . . . . .PagePRINTING PRESSES113 Impression cylinders <strong>of</strong> a newspaperrotary printing press . . . . . . . . . . . . . . . . 162114 Blanket cylinder <strong>of</strong> a sheet-fed <strong>of</strong>fsetpress . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164PUMPS115 Centrifugal pump . . . . . . . . . . . . . . . . . . 165116-117 Axial piston machines . . . . . . . . . . . . . . . 166VENTILATORS, COMPRESSORS,FANS118 Exhauster . . . . . . . . . . . . . . . . . . . . . . . . 169119 Hot gas fan . . . . . . . . . . . . . . . . . . . . . . . 170120 Fresh air blower . . . . . . . . . . . . . . . . . . . . 171PRECISION MECHANICS,OPTICS, ANTENNAS121 Optical telescope . . . . . . . . . . . . . . . . . . 172Radiotelescope . . . . . . . . . . . . . . . . . . . . 174122 Elevation axle . . . . . . . . . . . . . . . . . . . . . 175123 Azimuth axis (track roller and kingpin bearings) . . . . . . . . . . . . . . . . . . . . . . 176124 Data wheel . . . . . . . . . . . . . . . . . . . . . . . 177GLOSSARY . . . . . . . . . . . . . . . . . . . . . 1785 FAG
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