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1、陈长梅One.Crank-ConnectingRodMechanismCrank-connectingrodmechanismconsistsofpiston-connectingrodgroup,crankshaftflywheelgroup,engineblockgroup.1．TheEngineBlockGroup（1）TheCylinderBlockThecylinderblockisthebasicpartoftheengine.Itformsthemainframeworkorfoundationoftheengine.Manypartso
2、ftheenginearefixedtoit.Theseitemsincludewaterpump,oilpan,flywheelorclutchhousing,ignitiondistributor,oilpump,fuelpump,andcylinderhead.（2）TheCylinderHeadThecylinderheadisboltedtothecylinderblock.Thetopofthecylinderblockiscoveredwiththecylinderheadwhichcontainsthecombustionchamber
3、（Fig.2-1）.Single-cylinderenginecylinderpistonPistonpinConnectingrodcrankshaftOilpipeInletvalveExhaustvalveTiminggearOilpumpconnectingrodflywheelcrankshaftpistoninletvalve进水阀exhaustvalvepushrodTappet挺杆timinggears■Valvegear阀装置■ConnectingrodEngineBodyCrankcase曲轴箱cylinderblockcylind
4、erheadcylinderoilpassageandwaterpassage油路和水路oilpanThecylindergasket气缸垫3.cylindergasket2.cylinderhead1.Cylinderheadcover4.Pad衬垫5.tofitsparkplug安装火花塞Pre-questions练一练1-cylinderheadcover;2-cylinderhead;3-cylindergasket;4-cylinderblock;5-oilpan油底壳气缸垫气缸体气缸盖罩气缸盖Componentsofpistonpiston
5、toppistonheadpistonskirt活塞销孔PistonpinholeSmallend小端Connectingrodbushing连杆衬套ConnectingrodBigendConnectingrodhalfshells半壳Connectingrodcapcompressionringsoilringspistonpinpistonconnectingrodcrankbearinghalfshell曲柄轴承半壳connectingrodcapIII.Exercises2．CrankshaftFlywheelGroup（1）Cranksha
6、ftThecrankshaftisthemainrotatingshaftoftheengine.Designedintotheone-piececrankshaftareareasformainbearingjournals,crankpins,counterweights,flywheelflange,anddrivinghub.Thecrankshaftandconnectingrodconvertthereciprocatingmotionofthepistontotherotarymotionofcrankshaft.Crankshaftsh
7、avedrilledoilpassages,throughwhichoilcanflowfromthemainbearingstotheconnecting-rodbearings.（2）FlywheelTheflywheelisacomparativelyheavywheel,boltedtotheflywheelflangeontherearendofthecrankshaft.Theinertiaoftheflywheeltendstokeepitrotatingataconstantspeed.Theflywheelalsohasseveral
8、otherfunctions,forexample,theflywheelhasringgea
