The Design of Rolling Bearing Mountings

More documents

Recommendations

Info

41 Belt tensioner for passenger car enginesThe cam shafts of many four-cycle engines are drivenwith toothed belts from the crankshaft.The belt tension necessary for quiet running is providedby an FAG bearing unit. This tensioning pulleyunit consists of a journal with integral raceways, a ballcageassembly and an outer ring with the plastic injection-mouldedtensioning pulley.The screw bore for fastening the tensioning pulley tothe engine housing is eccentrically located so that thebelt tension can be applied by rotating the journal.The bearing unit is sealed on both sides and packedwith grease for life. Speed is approximately7,000 min –1 .41: Belt tensioner for passenger car engines61 FAG
42 Axle box roller bearings of an Intercity train carriageThe type of axle box roller bearings presented here isused for Intercity traffic in Europe.The bogie frame is supported on the bearing housingby a central coil spring, arranged above the bearings.The wheelsets are guided by plate-type guiding armswhich are bolted on one side.Operating dataDeadweight of the carriage plus maximum payload:64,000 kg; two bogies, each with two wheelsets, implies4 wheelsets per car.Resulting axle weight per wheelset: A = 64,000/4 =16,000 kg; weight of wheelset G R = 1,260 kg;acceleration due to gravity g = 9.81 m/s 2 ;supplementary factor for dynamic loads occurring duringoperation f z = 1.3;thrust factor for cylindrical roller bearings f a = 1;number of bearings per wheelset i R = 4.Thus the equivalent dynamic load per bearing is:P = (A – G R )/i R · g · f z · f aP = (16,000 – 1,260)/4 · 9.81 · 1.3 · 1 = 46,990 NP = 46.99 kNWheel diameter D R = 890 mm;maximum speed v max = 200 km/h (possible speed250 km/h).Bearing selectionCylindrical roller bearings installed as axle box rollerbearings offer important advantages:Mounting is simple and they are easy to check andmaintain in main inspections.Axial clearance is irrelevant for radial clearance. Cylindricalroller bearings are pure radial bearings, but thelips allow the safe accommodation of all thrust loads(guiding forces) occurring in operation.Of all the roller bearing types cylindrical roller bearingshave the lowest friction. Their speed suitability istherefore greater than in the case of other roller bearings.Cylindrical roller bearings do not, however, compensatefor misalignment between axle and bogie frame.Therefore misalignment must be corrected by angularfreedom of the housing.The same cylindrical roller bearings are used for passengercars and freight cars. This simplifies stockkeeping.Each axle box accommodates two cylindrical rollerbearings, one FAG WJ130x240TVP and one FAGWJP130x240P.TVP.The bearing dimensions (d x D x B) are 130 x 240 x80 mm; the dynamic load rating C of one bearing is540 kN.The nominal rating life (L h10 ) is checked in kilometreswhen dimensioning the axle box bearings:L h10km = (C/P) 3.33 · D · π = (540/46.99) 3.33 · 890 · π =3,397 · 2,497.6 ≈ 9.5 million kilometres.Under these conditions the bearings are sufficiently dimensioned.5 million kilometres (lower limit) appliestoday as a basis for dimensioning axle box bearings forpassenger train carriages.Machining tolerancesBearing inner rings carry circumferential load; thereforethey are press-fitted: axle journal p6, housing H7.Bearing clearanceThe tight fit expands the bearing inner rings which reducesradial clearance. The air stream cools the outerrings to a greater extent than the inner rings duringtravel which leads to a further reduction in radial clearance.Therefore the bearings have a radial clearance of120 to 160 microns.Lubrication, sealingThe bearings are lubricated with a lithium soap basegrease. Lamellar rings at the wheel side provide for effectivenon-rubbing sealing. A baffle plate at the coverend keeps the grease close to the bearing. Despite thesmall amount of grease (≈ 600 g) high running efficiency(800,000 km and more) can be reached due tothe polyamide cages without changing the lubricant.FAG 62
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 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: 40 Water pump for passenger car and
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
Page 95 and 96: 68 Dryer rollsThe remaining water i
Page 97 and 98: 69 Guide rollsGuide rolls guide, as
Page 99 and 100: 70 Calender thermo rollsThe paper p
Page 101 and 102: 71 Anti-deflection rollsAnti-deflec
Page 103 and 104: 73 Run wheel of a material ropewayO
Page 105 and 106: 74 Rope return sheaves of a passeng
Page 107 and 108: 75 Rope sheave (underground mining)
Page 109 and 110: 76 Rope sheave of a pulley blockIn
Page 111 and 112: 77 Crane pillar mounting with a sph
Page 113 and 114:
79 Roller track assemblyThe radial
Page 115 and 116:
80 Crane run wheelOperating dataWhe
Page 117 and 118:
81 Crane hookThe load suspended fro
Page 119 and 120:
83 Head pulley of a belt conveyorOn
Page 121 and 122:
Internal bearings for the tension/8
Page 123 and 124:
Belt conveyor idlersMany industries
Page 125 and 126:
87 Bucket wheel shaft of a bucket w
Page 127 and 128:
89 Drive unit of a finished goods e
Page 129 and 130:
91 Vibrating road rollerThe vibrati
Page 131 and 132:
92 Double toggle jaw crusherDouble
Page 133 and 134:
94 Double-shaft hammer crusherDoubl
Page 135 and 136:
95 Ball tube millTube mills are mos
Page 137 and 138:
96 Support roller of a rotary kilnR
Page 139 and 140:
Vibrating machinesVibrating screens
Page 141 and 142:
98 Two-bearing screen with straight
Page 143 and 144:
99 Four-bearing screenThe vibration
Page 145 and 146:
101-103 Large capacity convertersCo
Page 147 and 148:
104Roll bearings of afour-high cold
Page 149 and 150:
Work rolls for the finishing sectio
Page 151 and 152:
107 Combined reduction and cogging
Page 153 and 154:
108 Work rolls of a section millThe
Page 155 and 156:
Two-high rolls of a dressing stand1
Page 157 and 158:
110 Straightening rolls of a rail s
Page 159 and 160:
111 Disk ploughIn a disk plough the
Page 161 and 162:
112 Plane sifterSifters are used in
Page 163 and 164:
Printing pressesPrinting quality is
Page 165 and 166:
114 Blanket cylinder of a sheet-fed
Page 167 and 168:
116 Axial piston machineCylinder bl
Page 169 and 170:
117 Axial piston machineOperating d
Page 171 and 172:
119 Hot gas fanGas temperature 150
Page 173 and 174:
121 Optical telescopeOperating data
Page 175 and 176:
122-124 RadiotelescopeFor radioastr
Page 177 and 178:
123 Azimuth axis (track roller and
Page 179 and 180:
GlossaryAdditivesAdditives are oil-
Page 181 and 182:
GlossaryAxial clearanceThe axial cl
Page 183 and 184:
GlossaryContamination factor VThe c
Page 185 and 186:
GlossaryEP additivesWear-reducing a
Page 187 and 188:
Glossary1. Safe retention and unifo
Page 189 and 190:
GlossaryLoad angleThe load angle i
Page 191 and 192:
Glossaryload and the ring to be fit
Page 193 and 194:
Glossaryaligning ball bearings, bar
Page 195 and 196:
GlossaryViscosityViscosity is the m
Page 197 and 198:
NotesFAG 196
show all

The Design of Rolling Bearing Mountings

Create successful ePaper yourself

Delete template?

Save as template?