CrankrodsystemCrankrodsystemisthemainmechanismsreciprocatinginternalcombustionengine.Crankrodsystemisrealizingworkcycleengine,andcompletetheenergyconversionmajorsportsparts.Indoingworkstroke,itwillfuelburningtheheatenergyproducedisthepistonreciprocatingmotion,crankshaftrotationmovementintomechanicalenergy,foreignpoweroutput；Inotherstroke,reliesontherotationoftheflywheelcrankandinertia,throughtheconnectingroddrivingthepistonmovementupanddown,tocreatetheconditionsforthenexttodowork.ThefunctionofthecrankrodsystemCrankrodsystemroleistoprovideburningtheplace,afterburningfuelgasinthepistontoproleinflationarypressureintherotationofthecrankshaftintotorque,andconstantlypoweroutput.(1)willgaspressureintocrankshaftoftorque(2)thereciprocatingmovementofthepistontotherotarymotionofthecrankshaftThecompositionofthecrankrodsystemCrankrodsystembythebodysgroup,thepistonconnectingrodgroup,crankshaftflywheelofthreeparts.(1)thebodygroups:thecylinderblock,cylindercushion,thecylinder,andthecrankcaseoilsump(2)thepistonlinkagegroups:thepiston,piston,pistonpins,connectingrod(3)thecrankshaftflywheel:thecrankshaftflywheel1.ThegroupThebodyisaskeletonoftheengine,istheengineagenciesandthesysteminstallation,whichthefoundation,theinstallationofallthemajorenginepartsandaccessories,undervariousload.Therefore,thebodymusthavetheenoughstrengthandrigidity.ThecylinderblockThecylinderblockistheengineofallagenciesandsystem,isintheengineassemblywasoneofthemostimportantcomponents.Thecylinderblockhavewater-cooledair-filledtypecylinderandthecylinderblock.Water-cooledthecylinderblockingeneralandcastintegrativecrankcase.Thecylinderblockuppertookoutallcylinder,aircylindersurroundingcavitymutualconnectedmakewatersets.Thelowerpartisusedtosupportofthecrankshaftcrankcase.Thecylinderblockhaveinline,Vandleveltothethreekindsofforms,incarsandVinlinecommonlyusedtwo.Thelowerpartofthecylinderblockstructuregeneraltype,gantrygate,andtunneltypethreeformsoftheair-filledtypethecylinderblockandthecrankcaseadoptfissionstylestructure,thecylinderblockandthecrankcaseseparate,thenassembledintocastingtogether.Thecylinderblockandthesurfaceofcylinderheadcasthasmanyheatsinktoensuresufficientheatdissipation,thecylinderblockofmaterialswithgreycastiron,inordertoimprovethegeneralthewearresistanceofthecylinder,andsometimesincastirontoaddasmallamountofalloyelementssuchasnickel,molybdenum,chromium,phosphorus,etc.But,infact,besidesthepistonandcylinderwallsurfacewiththeotherpart,torequestisnothighwearresistance.Inordertotheeconomyofthematerial,widelyusedthecylinderinsertedintothecylinderlinertoformincylindersurface.So,cylinderlinerwearresistancecanbetteralloycastironorsteelalloymanufacture,inordertoprolongtheservicelife,andcylindercylinderoflowpricecanbeusedordinarycastironandaluminumalloymaterialsmanufacturing.Thecylinderlinerisdryandwettypetwokinds.Drycylinderlineroutsidesurfacearenotdirectwithcoldwatercontact,thewallthicknessgeneralfor13mm.Onthesurfaceofthecylinderlinerandassemblyofthecylinderbodysurfaceusinginterferencefitted.Wetcylinderlinersurfacedirectlycontactwiththecoolingwaterandgoodcoolingeffect.Thewallthicknessthandrycylinderliner,generallyfor5to9mm.CylinderheadThecylinderheadisthemainpurposeofthepistonandcylinder,closedthetopandcylinderwallstogethermakeupthecombustionchamber.Generalwater-cooledenginewithinthecylinderheadcastajacket,underthecylinderheadendandcylinderfortopcorrespondingtothewaterjacketisthesame,usewatertocoolthecirculationofthecombustionchamberwallofhightemperature,suchaspart；Theair-filledtypeenginecylinderheadonmanyheatsink,castbyincreasingheatareatoreducethetemperatureofthecombustionchamber.Theenginecylinderheadshallhavetheexhaustportacatheterholeandintotheexhaustpassage,etc.Thegasolineenginecylinderheadalsoshouldhavethesparkplughole,andalsohasinstalledthedieselengineinjectordoholes.CylindercushionThecylinderandthecylinderblockwithcylinderliner,thebetweentheroleistoensurethatthecylinderandthecylinderblockofbetweensealedtopreventleakageofcombustionchamber,waterleaking.OilpanisTheoilpanismaineffectistobestoredandsealedthecrankcaseoil.Theoilpanisforceissmall,generallyUSESthethinstampingsteelandinto.2.ThepistonsconnectingrodgroupThepistonconnectingrodgroupofpiston,piston,pistonpins,connectingrod,connectingrodbearingsetc.pistonThepistonistheroleofcylinderhead,cylinderwallswithtogether,andheirsofthecombustionchamberofgascylinderpressure,throughthepistonpinswillforcetotheconnectingrod,inordertopromotetherotationofthecrankshaft.Thepiston