Marginally lubricated

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BearingAssembly70.20.15Increase standardclearancesto level indicatedby pUu lineMB rangepUu0.1Recommended minimum diametral clearance C D [mm]0.080.060.050.040.030.022.8 N/mm² x m/s1.00.50.350.250.150.10PM rangeUse standard clearancesunless fine runningrequired0.011020 30 40 50 60 70 80 90 100Journal diameter D J [mm]Fig. 21:Minimum clearance for PM prefinished and MB machinable metric rangemachined to H7 bore21.5Rubbing speed factor u10.500 0.5 1Rubbing speed U [m/s]1.5 2 2.5Fig. 22:Rubbing speed factor u23
7 BearingAssemblyFluid LubricationThe minimum clearance required for journalbearings operating under hydrodynamicor mixed film conditions for a rangeof shaft rotational speeds and diameters isshown in Fig. 23 It is recommended thatthe bearing performance under minimumclearance conditions be confirmed by testingif possible.0.06Diametral clearance C D [mm]0.050.040.030.0250 45 40 35 30 252018151210Detail design requiredfor rubbing speedsabove 3 m/s0.010100Speed N [rev/min]1000Fig. 23:DX minimum clearances - bush diameters D i 10-50 mmAllowance for Thermal ExpansionFor operation in high temperature environmentsthe clearance should be increasedby the amounts indicated by Fig. 24 tocompensate for the inward thermal expansionof the bearing lining.Increase in minimum diametral clearance [mm]0.050.040.030.020.0100 20 40 60 80 100 120 140 160Environmental temperature T amb [°C]Fig. 24: Recommended increase in diametral clearanceIf the housing is non-ferrous then the bore ference fit to the bush, with a similar reductionin the journal diameter additional toshould be reduced by the amounts given inTable 6, in order to give an increased inter-that indicated by Fig. 24.24
Page 1 and 2: DXMarginally lubricatedDesigner´s
Page 3 and 4: Formula Symbols and DesignationsFor
Page 5 and 6: 1 Introduction1 IntroductionThe pur
Page 7 and 8: 3 Properties3 Properties3.1 Physica
Page 9 and 10: 4 LubricationGreaseThis is the reco
Page 11 and 12: 4 LubricationBoundary lubricationCh
Page 13 and 14: 4 LubricationTable 4: Viscosity dat
Page 15 and 16: 5 Design FactorsSpecific load limit
Page 17 and 18: 5 Design Factors3.02.5Speed/Load fa
Page 19 and 20: 5 Design Factors5.7 Bearing SizeFri
Page 21 and 22: 5 Design Factors5.9 Worked Examples
Page 23: 7 BearingAssembly7 Bearing Assembly
Page 27 and 28: 7 BearingAssembly7.4 InstallationIm
Page 29 and 30: 7 BearingAssemblyFig. 30:Installati
Page 31 and 32: 8 Machining8.3 ReamingDX can be rea
Page 33 and 34: 9 Electroplating9 ElectroplatingDX
Page 35 and 36: 10 StandardProductsPart No.PM 1515
Page 41 and 42: 10 StandardProducts10.2MB-DX cylind
Page 43 and 44: 10 StandardProductsPart No.max.D i
Page 45 and 46: 10 StandardProductsPart No.MB 10560
Page 47 and 48: 10 StandardProductsPart Nr.14DX1214
Page 49 and 50: 10 StandardProducts10.4DX Thrust Wa
Page 51 and 52: 10 StandardProducts10.6DX Strip - m

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