机械设计课程设计零件图改错题及答案

Chapter15shafts§15.1TypesandmaterialsofshaftsAxleMByloadClassificationofshaftsSpindleTShaftM+TByshaftaxesCrankshaftFlexibleshaftStraightshaftSteppedshaftNo-steppedshaftTurnaxleFixedaxleClassificationofshaftsClassificationofshaftsSpindle

ShaftClassificationofshaftsSteppedshaftCrankshaftNo-steppedshaftHollowshaftStraightshaftsFlexibleshaftsClassificationWhattypesofshafts?ClassificationofshaftsMaterialsofshaftsMedium-carbonsteelsoralloysteelsNormalizing,quenchingandtempering§15.2Theprocedureofshaftdesign1.Determinetheminimumdiameteroftheshaftbymeansoftorque2.Designtheshaftstructure3.Strengthcalculation§15.3ConsiderationsforshaftgeometryLockringatshaftendFlexibleretainingrings/circlipforshaftLocationofelementsonshaftRoundnutandluggedwasherJamnutsLocationofelementsonshaftSetscrewShaftshoulderandsleeveLocationofelementsonshaftShaftshoulderSleeveShaftshoulder

shaftringh≈(0.07～0.1)dOrh≥3～5mmb=1.4hLocationofelementsonshaftr<Corr<RDdrRDdCrCDdrDdrRbhhConeFixedretainingringsLocationofelementsonshaftLocationofelementsonshaftUnreasonableImprovedWaysofimprovingthestrengthofshaftsWaysofimprovingthestrengthofshaftsUnreasonableImprovedWaysofimprovingthestrengthofshaftsUnreasonableImprovedInnerradiusIsolatedringWaysofimprovingthestrengthofshaftsShouldercornershapemodificationWaysofimprovingthestrengthofshaftsThekeywaysshouldbeinthesamegeneratrixWaysofimprovingthestrengthofshaftsUnreasonableImproved§15.4ThestrengthofshaftOnekeywayTwokeywaysd＞100mm(1+3%)d(1+7%)dd≤100mm[1+(5%～7%)]d[1+(10%～15%)]d1.Determinetheminimumdiameteroftheshaftbymeansoftorque2.DesigningshaftwithcombinedbendingandtorsionalstressFtFaFtFrFH2FH1MHFrFaMV1BACDFV2MHFV1’FV1MV2M1M2MVTTFV1’FV1FH1FV2FH2M=水平面受力图水平面弯矩图垂直面受力图垂直面弯矩图合成弯矩图扭矩图TT作出轴的计算简图画出垂直面受力图及弯矩图MV画出水平面受力图及弯矩图MH画出合成弯矩图M画出扭矩图TTorsionalmomentconstantPulsatingreversing0.30.61-----Table15.53.CheckingthefatiguestrengthExample:CorrectstructureerrorsinshaftsystemLocatingofelementsonshaft3.Mountinganddismountingeasily2.Adjustingofbearings’clearanceCorrectstructureerrorsinshaftsystemCorrectst