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1、DRIVEAXLEASSEMBLIESAfterstudyingthischapter,youwillbeableto:■Explaintheconstructionofdifferenttypesofdriveaxleassemblies.■Listthepartsofvariousdriveaxles.■Comparethedifferencesbetweenarearwheelandfrontwheeldriveaxleassembly.■Describetheoperatingprinciplesofdriveaxleassemblie
2、s.Driveaxleassemblieshaveseveralimportantfunctions.Theymustholdthewheelson,keepthemupright,allowthemtobeturned(infront,onfour-wheeldriveandfront-wheeldrivevehicles)andpropelthewheelsforwardorbackward.Theymustdrivethewheelsinsuchamannerthatonecanturnfasterthantheother,yetboth
3、mustreceivetorque.Driveaxleassembliesmustabsorbthedrivingforceofthewheels,andtransmitittotheframethroughsprings,controlrods,etc.Theaxleassemblyprovidesananchorageforsprings,supportstheweightofthevehicleandformsthefoundationuponwhichthewheelbrakesaremounted.Obviously,theaxlea
4、ssembliesmustbewellconstructed,usingqualitymaterials.HOUSINGTheaxlehousingisusuallymadeofstampedsteelpartsweldedtogether.Or,thecentersectionofthehousingmaybemadeofcaststeel.Twobasictypeshavebeenused:theBANJOtypehousing(inwideuse)andtheSPLIThousing(littleused)consistingoftwoo
5、rmorepieces.AXLESTwosteelaxlesareplacedinsidethehousing.Theirinnerendsalmosttouch;and,insomecases,theydotouch.Theouterendsprotrudeoutofthehousingandformabaseuponwhichthewheels,hubs,etc.areattached.Theinnerendsaresplinedandaresupportedbythedifferentialassembly.Theouterendsare
6、supportedinrollerorhallbearings.ATTACHINGWHEELHUBSTwomethodsareemployedtosecurcthewheelhubstotheaxle.Oneemthodemploysataperontheaxleend;tileotherformstheaxleendintoaflangeuponwhichthewheelisbolted.TYPESOFAXLESLiveaxles(axlesthatturnwiththewheels)areofthreebasictypes:full-flo
7、ating,three-quarter-floatingandsemifloating.Mostcarsutilizethesemifloatingaxle.Mosttruckshavefull-floatingaxles.Iftileaxlebreaks,tilewheelwillnotcomeoff.Tilethreetypes.DRIVINGTHEAXLESThereal'wheelsofavehiclemustturnatdifferentspeedswhenroundingtheslightestcorner(outsidewheel
8、mustrollfarther).Therefore,itisnecessarytoemployaunitcalledaDIFFERENFIALtod
