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1、Machinery'sHandbook28thEditionINVOLUTESPLINES2183SPLINESANDSERRATIONSAsplinedshaftisonehavingaseriesofparallelkeysformedintegrallywiththeshaftandmatingwithcorrespondinggroovescutinahuborfitting;thisarrangementisincontrasttoashafthavingaseriesofkeysorfeathersfitte
2、dintoslotscutintotheshaft.Thelatterconstructionweakenstheshafttoaconsiderabledegreebecauseoftheslotscutintoitandconsequently,reducesitstorque-transmittingcapacity.Splinedshaftsaremostgenerallyusedinthreetypesofapplications:1)forcouplingshaftswhenrelativelyheavyto
3、rquesaretobetransmittedwithoutslippage;2)fortrans-mittingpowertoslidably-mountedorpermanently-fixedgears,pulleys,andotherrotatingmembers;and3)forattachingpartsthatmayrequireremovalforindexingorchangeinangularposition.Splineshavingstraight-sidedteethhavebeenusedin
4、manyapplications(seeSAEParal-lelSideSplinesforSoftBroachedHolesinFittings);however,theuseofsplineswithteethofinvoluteprofilehassteadilyincreasedsince1)involutesplinecouplingshavegreatertorque-transmittingcapacitythananyothertype;2)theycanbeproducedbythesametechni
5、quesandequipmentasisusedtocutgears;and3)theyhaveaself-centeringactionunderloadevenwhenthereisbacklashbetweenmatingmembers.InvoluteSplinesAmericanNationalStandardInvoluteSplines*.—Thesesplinesormultiplekeysaresimilarinformtointernalandexternalinvolutegears.Thegene
6、ralpracticeistoformtheexternalsplineseitherbyhobbing,rolling,oronagearshaper,andinternalsplineseitherbybroachingoronagearshaper.Theinternalsplineisheldtobasicdimensionsandtheexternalsplineisvariedtocontrolthefit.Involutesplineshavemaximumstrengthatthebase,canbeac
7、curatelyspacedandareself-centering,thusequalizingthebearingandstresses,andtheycanbemeasuredandfittedaccurately.InAmericanNationalStandardANSIB92.1-1970(R1993),manyfeaturesofthe1960standardareretained;plustheadditionofthreetoleranceclasses,foratotaloffour.Theterm“
8、involuteserration,”formerlyappliedtoinvolutesplineswith45-degreepressureangle,hasbeendeletedandthestandardnowincludesinvolutesplineswith30-,37.5-,and45-degreep
