The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
46 Axle box roller bearings for the ICE driving unitThe bogie frame is supported by 2 coil springs each onthe bearing housings. The wheelset with the housingsis connected to the bogie by an arm. A setting mechanismenables the mounting of the wheelsets in thebogies without preload. The bearing units are axiallylocated by a cover.Operating dataAxle load: 19,900 kgWeight of unsprung weight: 2,090 kgDiameter of wheel 1,040 mmMaximum speed 250 to 280 km/h.Housing to:Bearing clearanceH7 (for GGG material)J7 (for aluminium alloys).A slight axial clearance is required for ideal running behaviourof the bogies at top speeds. It is between 0.2and 0.5 mm after mounting.Bearing selectionFAG tapered roller bearing units TAROL 150/250 aremounted in the wheelset housings of the series vehicleswith the designation ET 401. The main component ofthese units is a double row tapered roller bearing withthe dimensions: 150 x 250 x 160 mm.Machining tolerancesThe cones carry circumferential load and therefore havea tight fit: journal to p6.Lubrication, sealingThe TAROL 150 is supplied as a complete unit whichis sealed. The sealing system consists of two parallelouter diameter seated lamellar rings and one singleweblabyrinth acting as a pre-seal. The labyrinth isshaped as a seal cap and pressed into the cup.The seal caps are each provided with four dischargeholes through which excess grease escapes. This is particularlyimportant directly after relubrication. O ringsprotect the bearing unit from the penetration of waterin the seating area of the cup.46: Axle box roller bearings of the ICE driving unit67 FAG
47Axle box roller bearingsof the Channel tunnel's freight engine, class 92Class 92 is used for freight traffic in the Euro tunnelbetween Great Britain and the Continent. It is a twosystemengine which means it can be operated on directcurrent (750 V) as well as on alternating current(25 kV). The engine with six axles (CoCo) draws loadsweighing up to 1,600 t.The vertical loads of the bogie are accommodated bytwo lateral coil springs on the housing of the axle boxbearings. All lateral and longitudinal forces act via theguiding journals and sleeves which are attached to thebogie frame and the housing.The middle axle of each triple axle bogie is designed asa floating axle box to insure trouble-free operation innarrow curves. The two outer axles are designed asstandard axles as customary.Operating dataVehicle weight 126,000 kg; two bogies each with threeaxles; wheel diameter 1,120 mm; top speed v max =140 km/h;Power P = 5,000 kW at 25 kV AC4,000 kW at 750 V DCBearing selectionTapered roller bearing units TAROL 150/250 withpressed cages (JP) are mounted to the outer standardaxles of the vehicles. The bearings are clearance-adjusted,greased and sealed by the manufacturer. Fey lamellarrings provide for sealing on the side facing thewheel. A gap-type seal prevents rough dirt from penetratingthe bearings.The floating axle is accommodated in two cylindricalroller bearings whose dimensions are 150 x 250 x80 mm. The extended inner ring allows axial displacementwithin the bearing of ± 20 mm at a maximum.Sealing is achieved at the wheel end by means of longwebbedlabyrinths.Machining tolerancesThe inner rings carry circumferential load and have atight fit to p6 on the journal.The housing bores (point load ) are machined accordingto H7.Bearing clearancePrior to mounting, the TAROL units of the standardaxle have an axial clearance of 0.665...0.740 mm andthe cylindrical roller bearing units a radial clearance toC4 in order to compensate for heat expansion.LubricationBoth bearing types are lubricated with a lithium soapbase grease. While the lubricant in the TAROL bearingsis only changed during the main inspections, thefloating axle bearings must be relubricated in between.Due to the constant right to left displacement of theaxle lubricant is removed from the bearing area andtherefore has to be replaced regularly.FAG 68
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46 Axle box roller bearings for the ICE driving unit<strong>The</strong> bogie frame is supported by 2 coil springs each onthe bearing housings. <strong>The</strong> wheelset with the housingsis connected to the bogie by an arm. A setting mechanismenables the mounting <strong>of</strong> the wheelsets in thebogies without preload. <strong>The</strong> bearing units are axiallylocated by a cover.Operating dataAxle load: 19,900 kgWeight <strong>of</strong> unsprung weight: 2,090 kgDiameter <strong>of</strong> wheel 1,040 mmMaximum speed 250 to 280 km/h.Housing to:<strong>Bearing</strong> clearanceH7 (for GGG material)J7 (for aluminium alloys).A slight axial clearance is required for ideal running behaviour<strong>of</strong> the bogies at top speeds. It is between 0.2and 0.5 mm after mounting.<strong>Bearing</strong> selectionFAG tapered roller bearing units TAROL 150/250 aremounted in the wheelset housings <strong>of</strong> the series vehicleswith the designation ET 401. <strong>The</strong> main component <strong>of</strong>these units is a double row tapered roller bearing withthe dimensions: 150 x 250 x 160 mm.Machining tolerances<strong>The</strong> cones carry circumferential load and therefore havea tight fit: journal to p6.Lubrication, sealing<strong>The</strong> TAROL 150 is supplied as a complete unit whichis sealed. <strong>The</strong> sealing system consists <strong>of</strong> two parallelouter diameter seated lamellar rings and one singleweblabyrinth acting as a pre-seal. <strong>The</strong> labyrinth isshaped as a seal cap and pressed into the cup.<strong>The</strong> seal caps are each provided with four dischargeholes through which excess grease escapes. This is particularlyimportant directly after relubrication. O ringsprotect the bearing unit from the penetration <strong>of</strong> waterin the seating area <strong>of</strong> the cup.46: Axle box roller bearings <strong>of</strong> the ICE driving unit67 FAG
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