《汽车发动机构造（双语课程）》习题-项目三 任务二 曲轴飞轮组检修（无答案）

项目三任务二曲轴飞轮组检修Item3Task2Crankshaftflywheelgroupmaintenance一.判断题（对“√”，错“×”）（25题）Ⅰ.Trueorfalsequestions（True“√”,false“×”）（25questions）.1.曲轴上磨光的表面为曲柄。（）1.Thepolishedsurfaceofthecrankshaftisacrank.()2.将曲轴支承在曲轴箱内旋转的轴颈为主轴颈，主轴颈的轴线都在同一直线上。（）2.Thecrankshaftissupportedinthecrankcaseandtherotatingjournalisthemainshaftjournal,andtheaxisofthemainshaftjournalisinthesamestraightline.()3.连杆轴颈之间有一定夹角。（）3.ThereisacertainAnglebetweentheconnectingrodjournal.()4.当发动机曲轴箱为隧道式时，可以采用整体式曲轴。（）4.Whentheenginecrankcaseistunneltype,theintegralcrankshaftcanbeused.()5.为使发动机运转平稳，一般在曲轴上设有平衡重。（）5.Inordertomaketheenginerunsmoothly,abalanceweightisgenerallyprovidedonthecrankshaft.()6.为防止润滑油流出曲轴箱，一般都采用挡油盘和油封等密封装置。（）6.Inordertopreventlubricatingoilfromflowingoutofthecrankcase,sealingdevicessuchasoilbaffleandoilsealaregenerallyused.()7.相邻的两个连杆轴颈之间，都设有主轴颈的曲轴称非全支承曲轴。（）7.Betweenthetwoadjacentconnectingrodjournal,thecrankshaftprovidedwiththemainshaftjournalissaidtobenotfullysupportedcrankshaft.()8.非全支承曲轴的主轴颈数等于或少于连杆轴颈数。（）8.Thenumberofspindlenecksofnon-fullysupportedcrankshaftisequaltoorlessthanthenumberofconnectingrod.()9.多缸发动机的连杆轴颈布置因气缸数、气缸排列形式和做功顺序（即点火顺序）而异。（）9.Thearrangementofconnectingrodjournalofmulti-cylinderenginevarieswiththenumberofcylinders,thearrangementofcylindersandtheorderofwork(ignitionorder).()10.曲轴的轴向窜动会影响曲柄连杆机构各零件之间的相互配合位置，所以必须采用定位装置加以限制。（）10.Theaxialmovementofthecrankshaftwillaffectthecoordinationpositionbetweenthepartsofthecrankshaftconnectingrodmechanism,sothepositioningdevicemustbeusedtolimitit.()11.飞轮上通常刻有第一缸点火正时记号，以便校准点火时刻。（）11.Theflywheelisusuallyengravedwiththefirstcylinderignitiontimingmark,sothattheignitiontimecanbecalibrated.()12.曲轴轴承的功用主要是减小摩擦和减轻曲轴等零件的磨损。（）12.Thefunctionofcrankshaftbearingismainlytoreducefrictionandreducethewearofcrankshaftandotherparts.()13.飞轮外缘上压有一个齿环，供启动发动机用。（）13.Thereisatoothringpressedontheouteredgeoftheflywheelforstartingtheengine.()14.曲轴裂纹不能进行焊修，要直接更换新件。（）14.Thecrankshaftcrackcannotbeweldedandrepaired,andanewpartshouldbereplaceddirectly.()15.新选用的轴承放入轴承座后，要求轴承的曲率半径大于轴承孔的曲率半径。（）15.Afterthenewlyselectedbearingisputintothebearingseat,thecurvatureradiusofthebearingisrequiredtobegreaterthanthecurvatureradiusofthebearinghole.()16.曲轴飞轮组是将活塞连杆组的往复直线运动转化为曲轴飞轮组的旋转运动，承受连杆传来的力，并由此产生绕自身轴线的旋转力矩，该力矩通过飞轮输送给底盘驱动汽车行驶，曲轴还用来驱动附件。（）16.Thecrankshaftflywheelgroupconvertsthereciprocatinglinearmotionofthepistonconnectingrodgroupintotherotatingmotionofthecrankshaftflywheelgroup,whichbearstheforcetransmittedbytheconnectingrodandgeneratesarotatingtorquearounditsownaxis.Thetorqueistransmittedtothechassisthroughtheflywheeltodrivethevehicle,andthecrankshaftisalsousedtodriveaccessories.()17.连杆轴承和曲轴主轴承一般都是分开式滑动轴承，主要由钢背和减磨层组成，钢背是轴承的基体，在钢背的内圆表面制有耐磨的减磨层。（）17.Connectingrodbearingsandcrankshaftmainbearingsaregenerallyseparatetypeplainbearings,mainlycomposedofsteelbackandwearreductionlayer,steelbackisthematrixofthebearing,intheinnersurfaceofthesteelbackmadeofwearreductionlayer.()18.减磨层所用的常用的减磨合金有巴氏合金、铜基合金、铝基合金三大类。（）18.ThecommonlyusedabradingalloyforreducingwearlayerhasBabbittalloy,copperbasealloy,aluminumbasealloythreecategories.()19.飞轮是一个转动惯量很大的圆盘，其功用是将在作功行程中的一部分功能储存起来，用以在其他行程中克服阻力，带动曲柄连杆机构越过上、下止点，保证曲轴的旋转角速度和输出转矩尽可能均匀，并使发动机有可能克服短时间的超载荷。（）19.Flywheelisalargemomentofinertiadisk,itsfunctionistostorepartofthefunctionintheworkstroke,toovercomeresistanceinotherstrokes,drivethecrankconnectingrodmechanismacrosstheupperandlowerdeadcenter,toensurethecrankshaftrotationangularspeedandoutputtorqueasuniformaspossible,andmakeitpossiblefortheenginetoovercomeashorttimeofoverload.()20.曲轴的常见故障是轴颈磨损、弯曲变形，严重时出现裂纹，甚至断裂。（）20.Thecommonfailureofcrankshaftisthejournalwear,bendingdeformation,seriouscracks,orevenfracture.()21.曲轴裂纹一般出现在应力集中处，如主轴颈或连杆轴颈与曲柄臂相连的过渡圆角处，表现为纵向裂纹（）21.Crankshaftcracksgenerallyappearatstressconcentration,suchasthemainshaftneckorthetransitioncornerwheretheconnectingrodshaftneckisconnectedtothecrankarm,manifestedaslongitudinalcracks()22.测量曲轴主轴承的径向间隙时，以规定力矩拧紧安装轴承盖后，必须要转动曲轴，然后拆下轴承盖，将轴承盖与轴径间被压扁的塑料间隙规取出，将其压扁的宽度与印制的刻度相比较，就可以测出结果。（）22.Measuringtheradialclearanceofthemainbearingofthecrankshaft,aftertighteningthebearingcovertothespecifiedtorque,itisnecessarytorotatethecrankshaft,andthenremovethebearingcover,removetheplasticclearancegaugebetweenthebearingcoverandtheshaftdiameter,andcomparethewidthoftheflatteningwiththeprintedscale,theresultcanbemeasured.()23.曲轴后端的回油螺纹一般为左旋。（）23.Thereturnoilthreadatthebackendofthecrankshaftisgenerallyleft-handed.()24.直列六缸发动机，做功顺序为1-5-3-6-2-4，当一缸压缩到上止点时，五缸处于进气行程。（）24.Thein-linesix-cylinderengineworksintheorderof1-5-3-6-2-4.Whenonecylinderiscompressedtothetopdeadcenter,thefivecylindersareintheintakestroke.()25.曲轴轴颈表面不允许有横向裂纹。对横向裂纹，其深度如在轴颈修理尺寸以内，可通过磨削磨掉，否则应予以报废。（）25.Transversecracksarenotallowedonthecrankshaftjournalsurface.Forthetransversecrack,ifitsdepthiswithintherepairsizeofthejournal,itcanbewornoffbygrinding,otherwiseitshouldbescrapped.()二.单选题（10题）Ⅱ.Multiplechoicequestions(Selectonlyoneanswerchoice)（10questions）1.采用组合式曲轴的发动机，主轴承为滚动轴承，相应曲轴箱为（）。1.Enginewithcombinedcrankshaft,mainbearingisrollingbearingandcorrespondingcrankcaseis(C).A．平分式B.龙门式C.隧道式 D.以上答案均不正确A.Bisector B.Gantry C.Tunnel D.Noneoftheaboveanswersarecorrect2.全支承曲轴的主轴颈数比连杆轴颈数（）。2.Thenumberofmainjournaloffullysupportedcrankshaftis()thatofconnectingrodjournal.A.多一个 B.少一个 C.一样多 D.以上答案均不正确A.Onemorethan B.Onelessthan C.asmany D.Noneoftheaboveanswersarecorrect3.丰田轿车发动机曲轴的直线度误差不大于（），否则进行冷压校正或更换曲轴。3.Toyotacarenginecrankshaftstraightnesserrorisnotgreaterthan(),otherwisethecoldpressurecorrectionorreplacementofthecrankshaft.A.0.01mmB.0.02mmC.0.03mmD.TheaboveanswersareallcorrectA.0.01mmB.0.02mmC.0.03mmD.以上答案均正确4.直列四缸发动机，做功间隔角用凸轮轴转角表示是（）。4.Thepowerintervalangleofin-linefour-cylinderengineisexpressedas（）bycamshaftrotationangle.A.90°B.180°C.270°D.360°D.以上答案均正确A.90°B.180°C.270°D.360°D.Theaboveanswersarecorrect5.曲轴轴向间隙一般为0.07～0.23mm，允许极限一般为（）。5.Thecrankshaftaxialclearanceisgenerally0.07~0.23mm,andtheallowablelimitisgenerally(C).A.0.26mm B.0.28mm C.0.30mm D.以上答案均正确A.0.26mm B.0.28mm C.0.30mm D.Theaboveanswersareallcorrect6.直列四缸发动机，做功间隔角用曲轴转角表示是（）。6.In-linefour-cylinderengine,theworkintervalangleisexpressedbythecrankshaftangleis（）.A.90° B.180° C.270° D.360°7.检测曲轴弯曲变形时应使用（）测量。7.The(C)shouldbeusedtomeasurethebendingdeformationofcrankshaft.A.游标卡尺 B.外径千分尺 C.百分表 D.塞尺A.Verniercaliper B.Outsidemicrometer