第1題Themanufacturingunitinamechanismiscalledacomponent.()第2題Fromastructuralandkinematicperspective,amachineismerelyageneraltermformechanisms.()第3題Themaincharacteristicsofamachineare:acombinationofvarioushuman-madephysicalobjects,definiterelativemotionbetweentheobjects,andtheabilitytoperformusefulmechanicalworkorachieveenergyconversion.()第4題Amechanismisthesmallestmanufacturingunitthatmakesupamachine.()第5題Acomponentreferstothebasicmotionunitofamechanism.()第6題Amachinecanbeasinglepartorarigidassemblyofseveralparts.()第7題Whenstudyingthemotionlawsofmechanisms,partsandassembliesarecollectivelyreferredtoascomponents.()第8題Fromastructuralandkinematicperspective,thereisnodistinctionbetweenmachinesandmechanisms.Amachinecanconsistofoneormultiplemechanisms.()第9題Thecomponentsofamachineormechanismcanbeclassifiedbytheirmotioncharacteristicsintofixedcomponents,drivingcomponents,anddrivencomponents.()第10題Machinesandmechanismsarecollectivelyreferredtoasmachinery.()第1題Inakinematicpair,ahigherpairispointcontact,andalowerpairislinecontact.()第2題Whenanalyzingthedegreesoffreedomofamechanism,theframehasonedegreeoffreedom.()第3題Eachindependentcomponentmakingplanarmotionhastwodegreesoffreedom.()第4題Dependingonthetypeofconnectionbetweentwocomponents,kinematicpairsareclassifiedintolowerpairsandhigherpairs.()第5題Therestrictionsappliedtoindependentmotionarecalledconstraints.()第6題Whencalculatingthedegreesoffreedomofamechanism,attentionshouldbepaidtocompoundjoints,localdegreesoffreedom,andredundantconstraints.()第7題Asimplediagramthatillustratesthecompositionofaplanarmechanismandtherealmotionrelationshipsbetweenitscomponentsiscalledaplanarmechanismkinematicdiagram.()第8題Whenthetotalnumberofcomponentsformingacompoundhingeisk,thenumberofrevolutepairsincludedatthatpointshouldbe____。AkBk+1Ck-1D1第9題Acomponentundergoingarbitrarymotioninaplanehas____degreesoffreedom.A1B2C3D4第10題Introducingalowerpairtoacomponentundergoingarbitrarymotioninaplanewillreducethenumberofdegreesoffreedomby____。A1B2C3D4Task3第1題Theswingingrodmechanismalwaysexhibitsquickreturncharacteristics.()第2題Duringtheoperationofamechanism,thepressureanglevaries.()第3題Inplanarlinkagemechanisms,thecomplementaryangleofthepressureangleiscalledthetransmissionangle.()第4題Inplanarlinkagemechanisms,thelargertheextremepositionangleθandtheKvalue,themorepronouncedthequickreturnmotioncharacteristic.()第5題Whetheramechanismhasadeadpointpositionisunrelatedtowhichcomponentischosenasthedrivingmember.()第6題Allplanarfour-barmechanismshaveacrank.()第7題Theformofafour-barlinkagemechanismcanonlybechangedbyselectingdifferentcomponentsasthefixedframe.()第8題Inafour-barlinkagemechanism,thecouplerthatcanmakeafullrotationiscalledarocker.()第9題Inafour-barlinkagemechanism,thecouplerthatcanmakeafullrotationiscalledacrank.()第10題Inacrank-rockermechanism,thelargerthepressureangle,thebettertheforcetransmissionperformance.()第11題Amongthefollowingfour-barlinkagemechanisms,theonethatcanachievequickreturnmotionis____.ADoublerockermechanismBCrank-rockermechanismCDoublecrankmechanismDNoneoftheabove第12題Inacrank-rockermechanism,theextremepositionsoftherockeroccurwhenitisinthe____position.AWhenthecrankandcouplerarecollinearBWhenthecrankandframearecollinearCWhenthecouplerandrockerarecollinearDWhentherockerandframearecollinear第13題Inacrank-rockermechanism,whenthedrivingcrankrotatesataconstantspeed,thedrivenrockeroscillatesatanunequalspeed.Thisphenomenoniscalledthe____ofthemechanism.ADeadpointphenomenonBMotionuncertaintyCQuickreturncharacteristicDStrokevariationTask4第1題Inacammechanism,ifthefollowerfollowsacosineaccelerationmotionlaw,thereisarigidimpactinthemechanism.()第2題Accordingtotheshapeofthecam,camscanbemainlyclassifiedintothreetypes:diskcams,translatingcams,andcylindricalcams.()第3題Accordingtotheshapeofthefollowerinthecammechanism,followerscanbemainlyclassifiedintothreetypes:pointedfollowers,rollerfollowers,andflatfollowers.()第4題Accordingtothemotionformofthefollowerinthecammechanism,followerscanbemainlyclassifiedintotwotypes:translatingfollowersandoscillatingfollowers.()第5題Thebasecircleofacamisacircledrawnwiththesmallestradiusofthetheoreticalcamprofilecurve.()第6題Inacammechanismwherethefollowermovesataconstantspeed,thedisplacementdiagramisahorizontalline,andthevelocitydiagramisalsoahorizontalline.()第7題Thefollowersincammechanismsarealwaysreciprocating.()第8題Thebasecircleradiusofadiskcamisthesmallestradialdistancefromthetheoreticalprofilecurvetothecenterofrotationofthecam.()第9題In____cammechanisms,formorecomplexcamprofiles,therequiredmotionlawcanalsobeaccuratelyachieved.APointedfollowerBRollerfollowerCFlatfollowerDAnytypeoffollower第10題Therelationshipbetweenthepressureangleofthecamandthebasecircleradiusis____.AThesmallerthebasecircleradius,thesmallerthepressureangleBThelargerthebasecircleradius,thesmallerthepressureangleCThesmallerthebasecircleradius,thelargerthepressureangleDThelargerthebasecircleradius,thelargerthepressureangleTask5第1題Thesimplestratchetmechanismgenerallyconsistsofaratchetwheel,apawl,andaframe.()第2題TheGenevadriveconsistsofadrivingwheelwithapin,adrivenwheelwithseveralradialslots,andaframe.()第3題Intermittentmotionmechanismscanconvertthecontinuousmotionofthedrivingmemberintointermittentmotionofthedrivenmember.()第4題Ratchetmechanismsandslider-crankmechanismsareintermittentmotionmechanisms.()第5題Thepitchdiameterofathreadisthenominaldiameterofthethread.()第6題Accordingtothedirectionofthethreadhelix,threadscanbeclassifiedintoleft-handthreadsandright-handthreads.()第7題Iftheinternalthreadisleft-hand,thenthematchingexternalthreadshouldberight-hand.()第8題Themainreasonforusingratchetmechanismsinliftingmachineryisthatratchetmechanismscanpreventtheweightfromfalling.()第9題Thethreadsuitableforconnectionsis____.ATrapezoidalthreadBButtressthreadCSquarethreadDTriangularthread第10題Thefollowingmechanismthatisnotanintermittentmotionmechanismis____.ARatchetmechanismBGenevadriveCSlider-crankmechanismDIncompletegearmechanism第11題Themainpurposeofusingaretainingpawlinaratchetmechanismisto____.APreventtheratchetwheelfromreversingBEnsuretheratchetwheelrotatesthesameangleeachtimeCDrivetheratchetwheelDIncreasethelifespanoftheratchetwheelTask6第1題Thepressureanglesatallpointsontheinvoluteprofileareequal.()第2題Thecorrectmeshingconditionforstraightbevelgearsisthatthemoduleandpressureangleatthelargeendareequal.()第3題Forapairofmeshingstraightspurgearswithinvoluteprofiles,thecontactpointstracetheexternalcommontangentofthebasecirclesofthetwogears.()第4題Geartransmissionscanbeclassifiedbasedontheworkingenvironmentintoenclosedgeartransmissions,opengeartransmissions,andsemi-enclosedgeartransmissions.()第5題Geartransmissionscanbeclassifiedbasedontherelativepositionsofthegearaxesintoparallelaxiscylindricalgeartransmission,intersectingaxisbevelgeartransmission,andskewaxisgeartransmission.()第6題Theconditionforcontinuoustransmissionofstandardinvolutestraightspurgearsisthatthecontactratiois≥1.()第7題Theminimumnumberofteethforastandardstraightspurgeartoavoidundercuttingis14.()第8題Whenmachininginvolutestraightspurgearsusingthegeneratingmethod,undercuttingoccursifthecutter'saddendumlineexceedsthetheoreticallimitofthemeshingline.()第9題Forstandardinvolutegears,theshapeofthegeartoothprofileisinfluencedbythesizeofthebasecircle.()第10題Generallyspeaking,straightgeartransmissionhasbetterstabilitythanhelicalgeartransmission.()第11題Themainfailuremodesofopengeartransmissionare____.APlasticdeformationofgearteethBPittingofthetoothsurfaceCWearofthetoothsurfaceandbreakageofgearteethDAdhesionofthetoothsurface第12題Forgearswiththesamenumberofteeth,asthemoduleincreases,thegeometricdimensionsandload-carryingcapacityofthegear____.ADecreaseBIncreaseCDonotchangeDCannotbedetermined第13題Forstandardinvolutegears,thefactoraffectingtheshapeofthegeartoothprofileis____.AThebasecircleradiusofthegearBThepitchcircleradiusofthegearCTheaddendumcircleradiusofthegearDTheradiusofanyarbitrarycircleofthegear第14題Forapairofstandardstraightspurgearswithamoduleof2mmandtoothnumbersof20and30,thecenterdistanceofthegeartransmissionis____.A100mmB200mmC50mmD25mmTask7第1題Agearmechanismcomposedofseveralpairsofgearsiscalledageartrain.()第2題Geartrainscanbeclassifiedintospurgeartrainsanddifferentialgeartrainsbasedonwhetherthegeometricaxesofthegearsarefixed.()第3題Inafixed-axisgeartrain,therotationalaxisofeachgearisfixed.()第4題Anidlergeardoesnotaffectthegearratiobutcanchangethedirectionofthedrivengear.()第5題Ifonegearaxisisnotfixed,thegeartrainiscalledaplanetarygeartrain.()第6題Inapairofgears,theratioofthespeedsofthetwogearsiscalledthegearratio.()第7題Combiningfixed-axisgeartrainsandplanetarygeartrainsiscalledaplanetarygeartrain.()第8題Geartrainscanachievelargergearratios.()第9題Thedegreeoffreedomofadifferentialgeartrainis2.()第10題Theratioofthenumberofteethbetweentwogearsinagearpairiscalledthegearratioofthegeartransmission.()第11題Ageartrainwithadegreeoffreedomof1is____.AdifferentialgeartrainBplanetarygeartrainCcompoundgeartrainDfixed-axisgeartrain第12題Thecharacteristicofaplanetarygeartrainis____.AItsgearratiocanbedirectlycalculatedfromtheoriginalgeartrainBAtleastonegeartoothprofileinthegeartrainisnotfixedCItsgearratioisconstantDAllgearaxesarefixedTask8第1題Slipinbelttransmissionisanormalphenomenonandcannotbeeliminated.()第2題Inbelttransmission,duetothetensiondifferencebetweenthetightsideandtheslackside,thebeltundergoeselasticsliponthepulley,whichcanbeavoided.()第3題Whenthediametersoftwopulleysareconstant,reducingthecenterdistancewillincreasethewrapangleofthesmallerpulley.()第4題Synchronoustoothedbeltsmainlytransmitmotionandpowerthroughmeshingbetweenteethandtoothgroovesonthepulleys,withoutslipbetweenthebeltandthepulleys,hencethetransmissionratioisconstant.()第5題TheincludedangleαbetweentheworkingsurfacesoftheV-beltiscalledthebelt'swedgeangle.()第6題Thepurposeofbelttensioningistogivethebeltacertaininitialtension.()第7題OrdinaryV-beltsworkbasedontheirbottomsurface.()第8題Thenumberoflinksinachaindriveshouldnotusuallybeanevennumber.()第9題Theaveragetransmissionratioofachaindriveisconstant.()第10題Chaindrivescanbeusedunderlow-speedheavyloadandharshworkingconditions.()第11題TheselectionofV-belttypemainlydependson____.AThepowertransmissionandthespeedofthesmallpulleyBBeltlinearspeedCTightsidebelttensionDSlacksidebelttension第12題Belttransmissionrelieson____totransmitmotionandpower.AFrictionbetweenthebeltandthebottomsurfaceofthepulleyBFrictionbetweenthebeltandthesidesurfaceofthepulleyCTightsidebelttensionDSlacksidebelttension第13題Thewrapangleofthechainonthesmallsprocketshouldgenerallybegreaterthan____.A90°B120°C150°D180°第14題Comparedwithgeartransmission,theadvantagesofchaintransmissionare____.AHightransmissionefficiencyBSmoothoperationwithnonoiseCHighload-carryingcapacityDAbilitytotransmitoverlongercenterdistancesTask9第1題Ashaftthatbearsbothbendingmomentandtorsioniscalledarotatingshaft.()第2題Ashaftthatonlybearsbendingmomentiscalledatransmissionshaft.()第3題Thepartoftheshaftthatfitswiththebearingiscalledthejournal,anditsdiametershouldmatchthebearing'sinnerdiameterstandard.()第4題Tofacilitateassembly,theendsofjournalsandshaftheadsshouldbechamfered.()第5題Thepartconnectingthejournalandtheshaftheadiscalledtheshaftbody.()第6題Thefinaldiametersandlengthsofthevarioussectionsoftheshaftcanbedeterminedwithoutaxialpositioningandfixingofthepartsontheshaft.()第7題Thetwosidefacesofaflatkeyareworkingsurfaces,andthereisnogapbetweenthetopsurfaceandthebottomofthehubslot.()第8題Aslidingkeyisgenerallyfixedtothehubandmoveswiththehubalongthekeywayontheshaft.()第9題Awedgekeyconnectionisusedforstaticconnections,andthetopandbottomsurfacesofthewedgekeyareworkingsurfaces.()第10題Lockingwashersareaformofmechanicallocking.()第11題Whichofthefollowingisnotacommonlyusedmethodforfixingpartsonashaft?____.AShaftcollarandshoulderBSleeveCRoundnutandlockingwasherDFlatkey第12題Keyconnections,pinconnections,andthreadedconnectionsallbelongto____.ADetachableconnectionsBNon-detachableconnectionsCWeldingDNoneoftheaboveTask10第1題Bearingscanbeclassifiedintorollingbearingsandslidingbearings.()第2題Thebasicstructureofarollingbearingconsistsoftheinnerring,outerring,bearingbush,andcage.()第3題Accordingtothemainloaddirectiontheybear,rollingbearingscanbeclassifiedintoradialbearings,thrustbearings,andradial-thrustbearings.()第4題Angularcontactballbearingscansimultaneouslybearradialandaxialloads.()第5題Deepgrooveballbearingscanonlybearradialloads.()第6題Thetotalworkinghoursofabearingataconstantspeediscalledthebearing'slifespan.()第7題Thetypecodeforangularcontactballbearingsis6.()第8題Thestructureofradialslidingbearingsmainlyincludesintegral,split,andself-aligningtypes.()第9題Themainfailuremodeofnon-liquidfriction