>> P.64
1-4BearingSelection(13)DisplacementWhenexternalloadisappliedtothebearing,deformation(displacement)occursatthecontactpointoftheballsandtheracewaygroove.RadialdisplacementWhenradialload(Fr)isappliedasinFig.13-1,themaximumload(Q)ontheballsisZ:NumberofballsFr.Q=Theradialdisplacement(δ)attheballandracewaygroovecontactpointisExpressedbyδ=eδ(Σρ)Q2.eδΣρ:Coefficientdeterminedbytherelationshipoftheballsandracewaygroove:SumofcontactpointprincipalcurvatureBecausetheballsareincontactwiththeinnerandouterrings,thetotaldisplacementamountisthesumofeachone'sdisplacementamount.δrδiδe:Totalradialdisplacementamount:Radialdisplacementamountbetweenballsandinnerringracewaygroove:RadialdisplacementamountbetweenballsandouterringracewaygrooveThus,thetotaldisplacementamount(δr)isshownwiththeformulabelow.δr=δi+δe102030405060708090100Radialload(N)0.0060.0050.0040.0030.0020.00100Elasticdisplacementamount(mm)FrQFig.13-164Fig.13-2Calculationexampleofelasticdisplacementamountfor608ZZduetoradialload
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