>> P.126
SplineshaftstrengthIKOLinearBallSplinesplineshaftscanreceiveloadsinalldirections.Therefore,attentionmustbepaidtosplineshaftstrength.ForbendingloadForbendingloadonthesplineshaft,selectashaftdiameterthatfulfillstheconditionsinformula(1).M=σ×Z(1)M:MaximumbendingmomentactingonsplineshaftN·mmσ:Splineshaftallowablebendingstress98N/mm2Z:Sectionmodulusofsplineshaftmm3(SeeTable13)M:MaximumbendingmomentFortorsionloadFortorsionloadonthesplineshaft,selectashaftdiameterthatfulfillstheconditionsinformula(2).T=τa×Zp(2)T:MaximumtorsionmomentN·mmτa:Splineshaftallowabletorsionstress49N/mm2Zp:Polarsectionmodulusofsplineshaftmm3(SeeTable13)T:MaximumtorsionmomentForsimultaneoustorsionandbendingloadForsimultaneoustorsionandbendingloadonthesplineshaft,calculatetheshaftdiametersfromtheequivalentbendingmomentformula(3)andtheequivalenttorsionmomentformula(4)andusethelargervalue.EquivalentbendingmomentMeMe=12(M+M2+T2)√Me=σ×Z(3)EquivalenttorsionmomentTeTe=M2+T2√Te=τa×Zp(4)StiffnessofsplineshaftThetorsionangleofthesplineshaftcausedbytorsionmomentmustnotexceed0.25°per1meter.Lθ:Torsionangle°L:SplineshaftlengthmmG:ShearModulus7.9×104N/mm2Ip:Polarmomentofinertiaofsectionareaofsplineshaftmm4(SeeTable13)θ=3602π(5)T×LG×Ip×0.25°≧1000LθLLθθθⅡ-118
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