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1、附录1BrakeSystems1.Drumvs.DiscBraketechnology,justlikesuspensiontechnologyandfuel-systemtechnology,hascomealongwayinrecentyears.1）DrumBrakesEarlyautomotivebrakesystems,aftertheeraofhandleversofcourse,usedadrumdesignatallfourwheels.Theywerecalleddrumbrakesbe
2、causethecomponentswerehousedinarounddrumthatrotatedalongwiththewheel.Insidewasasetofdrumthat,whenthebrakepedalwaspressed,wouldforcetheshoesagainstthedrumandslowthewheel.Fluidwasusedtotransferthemovementofthebrakepedalintothemovementofthebrakeshoes,whileth
3、edrumthemselvesweremadeofheat-resistantfrictionmaterialsimilartothatusedonclutchplates.Thisbasicdesignprovedcapableundermostcircumstances,butithadonemajorflaw.Underhighbrakingconditions,likedescendingasteephillwithaheavyloadorrepeatedhigh-speedslowdowns,d
4、rumbrakeswouldoftenfadeandloseeffectiveness.Usuallythisfadingwastheresultoftoomuchheatbuild-upwithintheshoes.Rememberthattheprincipleofbrakinginvolvesturningkineticenergy(wheelmovement)intothermalenergy(heat).Forthisreason,drumbrakescanonlyoperateaslongas
5、theycanabsorbtheheatgeneratedbyslowingavehicle'swheels.Oncethebrakecomponentsthemselvesbecomesaturatedwithheat,theylosetheabilitytohaltavehicle,whichcanbesomewhatdisconcertingtothevehicle'soperator.2）DiscBrakesDiscbrakesareusedonthefrontwheelsofmostcarsan
6、donallfourwheelsonmanycars.Adiscrotorisattachedtothewheelhubandrotateswiththetireandwheel.Whenthedriverappliesthebrakes,hydraulicpressurefromthemastercylinderisusedtopushfrictionliningsagainsttherotortostopit.Inthediscbrakerotorassembly,therotorisusuallym
7、adeofcastiron.Thehubmaybemanufacturedasonepiecewiththerotororintwoparts.Therotorhasamachinedbrakingsurfaceoneachface.Asplashshield,mountedtothesteeringknuckle,protectstherotorfromroadsplash.Arotormaybesolidorventilated.Ventilateddesignshavecoolingfinscast
8、betweenthebrakingsurfaces.Thisconstructionconsiderablyincreasesthecoolingareaoftherotorcasting.Also,whenthewheelisinmotion,therotationofthesefan-typefinsintherotorprovidesincreasedaircirculationandmoreefficientcooli
