>> P.126
Ⅱ-118LθLθLθIKOLinearBallSplinesplineshaftscanreceiveloadsinalldirections.Therefore,attentionmustbepaidtosplineshaftstrength.ForbendingloadForbendingloadonthesplineshaft,selectashaftdiameterthatfulfillstheconditionsinformula(1).M=σ×Z(1)M:MaximumbendingmomentactingonsplineshaftN·mmσ:Splineshaftallowablebendingstress98N/mm2Z:Sectionmodulusofsplineshaftmm3(SeeTable13)FortorsionloadFortorsionloadonthesplineshaft,selectashaftdiameterthatfulfillstheconditionsinformula(2).T=τa×Zp(2)ForsimultaneoustorsionandbendingloadForsimultaneoustorsionandbendingloadonthesplineshaft,calculatetheshaftdiametersfromtheequivalentbendingmomentformula(3)andtheequivalenttorsionmomentformula(4)andusethelargervalue.EquivalentbendingmomentMeMe=1(M+M2+T2)(3)2Me=σ×ZEquivalenttorsionmomentTeTe=M2+T2(4)Te=τa×ZpStiffnessofsplineshaftThetorsionangleofthesplineshaftcausedbytorsionmomentmustnotexceed0.25°per1meter.θ=T×L×360(5)G×Ip2π0.25°≧1000θLT:MaximumtorsionmomentN·mmτa:Splineshaftallowabletorsionstress49N/mm2ZpPolarsectionmodulusofsplineshaftmm3(SeeTable13)θ:Torsionangle°L:SplineshaftlengthmmG:ShearModulus7.9×104N/mm2Ip:Polarmomentofinertiaofsectionareaofsplineshaftmm4(SeeTable13)√√SplineshaftstrengthM:MaximumbendingmomentT:Maximumtorsionmoment
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