項目二任務(wù)四氣門組檢修Item2Task4Maintenanceofthevalvegroup一.判斷題（對“√”，錯“×”）（30題）Ⅰ.Trueorfalsequestions（True“√”,false“×”）（30questions）1.曲軸與凸輪軸之間的傳動方式有齒輪傳動、鏈傳動、和帶傳動三種。（）1.Therearethreetransmissionmodesbetweencrankshaftandcamshaft:geardrive,chaindriveandbeltdrive.（）2.氣門間隙是指氣門與氣門座之間的間隙。（）2.Thevalveclearancereferstothegapbetweenthevalveandthevalveseat.（）3.進氣門頭部直徑通常比排氣門的大，而氣門錐角有時比排氣門的小。（）3.Theintakevalveheaddiameterisusuallylargerthantheexhaustvalve,andthevalveconeAngleissometimessmallerthantheexhaustvalve.（）4.凸輪軸的轉(zhuǎn)速比曲軸的轉(zhuǎn)速快一倍。（）4.Thespeedofthecamshaftistwicethatofthecrankshaft.（）5.采用液力挺柱的發(fā)動機其氣門間隙等于零。（）5.Thevalveclearanceoftheengineusingthehydraulictappetisequaltozero.（）6.挺柱在工作時既有上下運動，又有旋轉(zhuǎn)運動。（）6.Thetappetmovesbothupanddownandrotateswhenworking.（）7.氣門的最大升程和在升降過程中的運動規(guī)律是由凸輪轉(zhuǎn)速決定的。（）7.ThemaximumliftofvalveandthemotionlawintheliftingprocessaredeterminedbytheCAMspeed.（）8.排氣持續(xù)角指排氣提前角與排氣遲后角之和。（）8.ExhaustdurationAnglereferstothesumofexhaustadvanceAngleandexhaustdelayAngle.（）9.正時齒輪裝配時，必須使正時標(biāo)記對準(zhǔn)。（）9.Whenthetiminggearisassembled,thetimingmarkmustbealigned.（）10.四沖程六缸發(fā)動機的同名凸輪夾角為120度。（）10.ThenamesakeCAMofthefour-strokesix-cylinderenginehasanAngleof120degrees.（）11.一般進氣門的氣門間隙比排氣門的間隙略小。（）11.Thevalveclearanceofthegeneralintakevalveisslightlysmallerthanthatoftheexhaustvalve.（）12.在任何時候，發(fā)動機同一缸的進排氣門都不可能同時開啟。（）12.Atanytime,theintakeandexhaustvalvesofthesamecylinderoftheenginecannotbeopenedatthesametime.（）13.凸輪軸的軸向竄動可能會使配氣相位發(fā)生變化。（）13.Theaxialmovementofthecamshaftmaycausethevalvephasetochange.（）14.搖臂是一個雙臂杠桿，為了加工方便，一般搖臂的兩臂是等長的。（）14.Therockerarmisatwo-armlever.Inordertofacilitateprocessing,thetwoarmsofthegeneralrockerarmareequalinlength.（）15.對于多缸發(fā)動機來說，各缸同名氣門的結(jié)構(gòu)和尺寸是完全相同的，所以可以互換使用。（）15.Formulti-cylinderengines,thestructureandsizeofeachcylindervalvewiththesamenameareexactlythesame,sotheycanbeusedinterchangeably.（）16.非增壓發(fā)動機在進氣結(jié)束時，氣缸內(nèi)壓力小于外界大氣壓。（）16.Attheendofintake,thepressureinthecylinderislessthantheexternalatmosphericpressure.（）17.進氣門遲閉角隨著發(fā)動機轉(zhuǎn)速上升應(yīng)加大。（）17.ThelateclosingAngleoftheintakevalveshouldbeincreasedwiththeincreaseofenginespeed.（）18.頂置式氣門是由凸輪軸上的凸輪壓動搖臂頂開的，其關(guān)閉是依靠氣門彈簧實現(xiàn)的。（）18.TheoverheadvalveisopenedbythecamshaftCAMpressureswayarm,anditsclosureisrealizedbythevalvespring.（）19.因為發(fā)動機的排氣壓力較進氣壓力大，所以在5氣門式的配氣機構(gòu)中，往往采用兩個進氣門和三個排氣門。（）19.Becausetheexhaustpressureoftheengineislargerthantheintakepressure,twointakevalveandthreeexhaustvalvesareoftenusedinthe5valvevalvemechanism.（）20.因為采用了液力挺柱，所以氣門間隙就不需要調(diào)整了。（）20.Becauseoftheuseofhydraulictappet,thevalveclearancedoesnotneedtobeadjusted.（）21.進氣遲閉角一旦確定后不會隨發(fā)動機的轉(zhuǎn)速而改變。（）21.OncetheintakelateclosingAngleisdetermined,itwillnotchangewiththeenginespeed.（）22.配氣相位是指進、排氣門的開啟時刻和開啟延續(xù)時間用曲軸轉(zhuǎn)角的表示。（）22.ThevalvephasereferstotheopeningtimeandopeningdurationoftheintakeandexhaustvalvesexpressedbythecrankshaftAngle.（）23.齒形帶在使用中不能與水或機油接觸，否則容易引起跳齒。（）23.Toothbeltcannotbeincontactwithwateroroilinuse,otherwiseitiseasytocausejumpingteeth.（）24.為了增加推桿的剛度和縱向穩(wěn)定性，應(yīng)把推桿做得盡量的長些。（）Inordertoincreasethestiffnessandlongitudinalstabilityofthepushrod,thepushrodshouldbemadeaslongaspossible.（）25.正時傳動為齒輪傳動時，為嚙合平穩(wěn)減小噪聲，正時齒輪多采用斜齒。（）25.Whenthetimingdriveisgeardrive,inordertoengagesmoothlyandreducethenoise,thetiminggearismostlyusedbevelteeth.（）26.凸輪輪廓形狀包括以凸輪旋轉(zhuǎn)中心為中心的圓弧、凸輪上升段和下降段。（）ThecontourshapeoftheCAMincludesanarccenteredontherotationcenteroftheCAM,aCAMrisingsectionandaCAMfallingsection.（）27.配氣機構(gòu)是根據(jù)發(fā)動機工作循環(huán)需要適時地打開和關(guān)閉進、排氣門的裝置。（）27.Thevalvemechanismisadevicethatopensandclosestheintakeandexhaustvalvestimelyaccordingtotheneedsoftheengineworkingcycle.（）28.氣門間隙的作用是保證氣門受熱膨脹后仍能保持良好密封。（）28.Theroleofvalveclearanceistoensurethatthevalvecanmaintainagoodsealafterheatexpansion.（）29.配氣機構(gòu)按凸輪軸的位置，可分為凸輪軸下置式、凸輪軸中置式和凸輪軸上置式。（）29.Accordingtothepositionofcamshaft,thevalvemechanismcanbedividedintocamshaftlowertype,camshaftmiddletypeandcamshaftuppertype.（）30.齒形帶由于結(jié)構(gòu)簡單、傳動可靠和工作噪聲小等特點被廣泛采用，但使用中要使齒形帶張緊合適，否則容易跳齒，造成配氣失準(zhǔn)。（）30.Thegearbeltiswidelyusedbecauseofitssimplestructure,reliabletransmissionandlowworkingnoise,butinuse,thegearbeltshouldbetensioningproperly,otherwiseitiseasytoskipteethandcausemisalignmentofgasdistribution.（）二.單選題（20題）Ⅱ.Multiplechoicequestions(Selectonlyoneanswerchoice)（20questions）1.曲軸與凸軸的傳動比是（）。1.Thetransmissionratioofcrankshaftandconvexshaftis（）.A.1∶1B.1∶2C.2∶1D.置于倉庫放置A.1∶1B.1∶2C.2∶1D.Placeinstorage2.四沖程發(fā)動機轉(zhuǎn)速為2000r/min時，則同一氣缸的進氣門，在一分鐘內(nèi)開閉的次數(shù)應(yīng)該是（）。2.Whenthefour-strokeenginespeedis2000r/min,theintakevalveofthesamecylindershouldbeopenedandclosed（）inoneminute.A．4000次B．2000次C．1000次D．500次A.4000timesB.2000timesC.1000timesD.500times3.氣門間隙過大，發(fā)動機工作時（）。3.Thevalveclearanceistoolarge,whentheengineisworking（）.A．氣門早開B．氣門遲開C．不影響氣門開啟時刻A.valveopenearly B.valvedelayed C.doesnotaffectthevalveopeningtime4.氣門的升程取決于（）。4.Theliftofvalvedependson（）.A．凸輪軸的輪廓B．凸輪軸的轉(zhuǎn)速C．配氣相位A.contourofcamshaft B.rotationalspeedofthecamshaftC.valvetiming5.設(shè)某發(fā)動機的進氣提前角為α，進氣遲關(guān)角為β，排氣提前角為γ，排氣遲關(guān)角為δ，則該發(fā)動機的進、排氣門重疊角為（）。5.IftheintakeadvanceAngleofanengineisα,theintakedelayclosingAngleisβ,theexhaustadvanceAngleisγ,andtheexhaustdelayclosingAngleisδ,thentheoverlapAngleoftheintakeandexhaustvalvesoftheengineis（）.A．α+βB．β+γC．α+δD.β+δ6.當(dāng)采用雙氣門彈簧時，兩氣門彈簧的旋向（）。6.Whenusingdoublevalvesprings,therotationdirectionofthetwovalvesprings（）.A．相同B．相反C．無所謂D.以其他情況而定A.Same B.Opposite C.Doesn'tmatter D.dependsonothercircumstances7.凸輪軸上凸輪的輪廓的形狀決定（）。7.Theshapeofthecontourofthecamshaftisdetermined（）.A．氣門的升程B．氣門的運動規(guī)律A.liftofvalve B.themotionlawofvalveC．氣門的密封狀況D.氣門的磨損規(guī)律C.valvesealconditionD.valvewearlaw8.下述各零件不屬于氣門組的是（）。8.Thefollowingpartsdonotbelongtothevalvegroupare（）.A．氣門彈簧B．氣門C．氣門彈簧座D.凸輪軸A.valvespringB.valveC.valvespringseatD.camshaft9.下述各零件不屬于氣門傳動組的是（）。9.Thefollowingpartsdonotbelongtothevalvedrivegroup（）.A．氣門彈簧B．挺柱C．搖臂軸D．凸輪軸A.valvespring B.tappet C.rockerarmshaft D.camshaft10.進、排氣門在排氣行程上止點時（）。10.Whentheintakeandexhaustvalvesareattheupperdeadcenteroftheexhauststroke（）.A．進氣門開，排氣門關(guān) B．排氣門開，進氣門關(guān)A.intakevalveopen,exhaustvalveclosed B.exhaustvalveopen,intakevalveclosedC．進、排氣門全關(guān) D．進、排氣門全開C.allintakeandexhaustvalvesareclosed D.intakeandexhaustvalvesarefullyopen11.進、排氣門在進氣行程下止點時（）。11.Whentheintakeandexhaustvalvesareatthelowerdeadcenteroftheexhauststroke（）.A．進氣門開，排氣門關(guān) B．排氣門開，進氣門關(guān)A.intakevalveopen,exhaustvalveclosed B.exhaustvalveopen,intakevalveclosedC．進、排氣門全關(guān)D．進、排氣門全開C.allintakeandexhaustvalvesareclosedD.intakeandexhaustvalvesarefullyopen12.下面零件中不是采用壓力潤滑方式的是（）。12.Thefollowingpartsthatdonotusepressurelubricationare（）.A．挺柱B．凸輪軸軸承C．搖臂D．凸輪軸正時齒輪A.tappet B.camshaftbearing C.rockerarm D.camshafttiminggear13.VVT-i智能可變配氣正時系統(tǒng)是根據(jù)不同的發(fā)動機轉(zhuǎn)速來改變（）的。13.VVT-iintelligentvariablevalvetimingsystemisbasedondifferentenginespeedtochange().A．進氣門的配氣相位B．進、排氣門的重疊角A.thevalvetimingoftheintakevalveB.theoverlapanglebetweentheintakeandexhaustvalvesC．排氣門的配氣相位 D．進、排氣門的配氣相位C.thevalvetimingoftheexhaustvalveD.thevalvetimingoftheintakeandexhaustvalves14.發(fā)動機一般排氣門的錐角較大，是因為（）。14.TheconeAngleofthegeneralexhaustvalveoftheengineislargerbecause（）.A．排氣門熱負荷大 B．排氣門頭部直徑小 C．配氣相位的原因A.exhaustvalveheatloadlarge B.exhaustvalveheaddiametersmall C.thecauseofthevalvephase15.下面哪種凸輪軸布置型式最適合于高速發(fā)動機（）。15.Whichofthefollowingcamshaftarrangementismostsuitableforhighspeedengines（）?A．凸輪軸下置式B．凸輪軸上置式C．凸輪軸中置式A.camshaftlowertype B.camshafttype C.camshaftinthemiddle16.氣門傳動組零件的磨損，配氣相位的變化規(guī)律是（）。16.Thewearofvalvetransmissiongrouppartsandthechangelawofvalvephaseare（）.A．早開早閉B．早開晚閉A.openearlycloseearly B.openearlyandcloselateC．晚開早閉D．晚開晚閉C.openlateandcloseearly D.openlateandcloselate17.從各缸的進、排氣凸輪軸的排列，我們可以判斷出發(fā)動機的（）17.Fromthearrangementoftheintakeandexhaustcamshaftofeachcylinder,wecanjudgethe（