机械设计课程设计零件图改错题及答案

Chapter15shafts§15.1TypesandmaterialsofshaftsAxleMByloadClassificationofshaftsSpindleTShaftM+TByshaftaxesCrankshaftFlexibleshaftStraightshaftSteppedshaftNo-steppedshaftTurnaxleFixedaxleClassificationofshaftsClassificationofshaftsSpindleShaftClassificationofshaftsSteppedshaftCrankshaftNo-steppedshaftHollowshaftStraightshaftsFlexibleshaftsClassificationWhattypesofshafts?ClassificationofshaftsMaterialsofshaftsMedium-carbonsteelsoralloysteelsNormalizing,quenchingandtempering§15.2Theprocedureofshaftdesign1.Determinetheminimumdiameteroftheshaftbymeansoftorque2.Designtheshaftstructure3.Strengthcalculation§15.3ConsiderationsforshaftgeometryLockringatshaftendFlexibleretainingrings/circlipforshaftLocationofelementsonshaftRoundnutandluggedwasherJamnutsLocationofelementsonshaftSetscrewShaftshoulderandsleeveLocationofelementsonshaftShaftshoulderSleeveShaftshouldershaftringh≈(0.07～0.1)dOrh≥3～5mmb=1.4hLocationofelementsonshaftrCorrRDdrRDdCrCDdrDdrRbhhConeFixedretainingringsLocationofelementsonshaftLocationofelementsonshaftUnreasonableImprovedWaysofimprovingthestrengthofshaftsWaysofimprovingthestrengthofshaftsUnreasonableImprovedWaysofimprovingthestrengthofshaftsUnreasonableImprovedInnerradiusIsolatedringWaysofimprovingthestrengthofshaftsShouldercornershapemodificationWaysofimprovingthestrengthofshaftsThekeywaysshouldbeinthesamegeneratrixWaysofimprovingthestrengthofshaftsUnreasonableImproved§15.4ThestrengthofshaftTTTdnPWT362.01055.933362.01055.9nPCnPdTOnekeywayTwokeywaysd＞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22VHMM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TbcaWTM122TorsionalmomentconstantPulsatingreversing0.30.61b1-----Table15.53.Checkingthefatiguestrength][22SSSSSSmakS＋1makS＋1Example:Correctstructureerrorsinshaftsystem1.Locatingofelementsonshaft3.Mountinganddismountingeasily2.Adjustingofbearings’clearanceCorrectstructureerrorsinshaftsystemCorrectstructureerrorsinshaftsystemCorrectstructureerrorsinshaftsystemCorrectstructureerrorsinshaftsystemHomework:15.4