毕业论文外文翻译-鼓式制动器

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1、中文4800字DrumbrakeAdrumbrakewiththedrumremovedasusedontherearwheelofacarortruck.Notethatinthisinstallation,acable-operatedparkingbrakeusestheserviceshoes.Adrumbrakeisabrakeinwhichthefrictioniscausedbyasetofshoesorpadsthatpressagainstarotatingdrum-shape

2、dpartcalledabrakedrum.Theterm"drumbrake"usuallymeansabrakeinwhichshoespressontheinnersurfaceofthedrum.Whenshoespressontheoutsideofthedrum,itisusuallycalledaclaspbrake.Wherethedrumispinchedbetweentwoshoes,similartoaconventionaldiskbrake,itissometimesc

3、alleda"pinchdrumbrake",althoughsuchbrakesarerelativelyrare.Arelatedtypeofbrakeusesaflexiblebeltor"band"wrappingaroundtheoutsideofadrum,calledabandbrake.History8AdrumbrakeattherearwheelofamotorbikeKawasakiW800Themodernautomobiledrumbrakewasinventedin1

4、902byLouisRenault,thoughaless-sophisticateddrumbrakehadbeenusedbyMaybachayearearlier.Inthefirstdrumbrakes,theshoesweremechanicallyoperatedwithleversandrodsorcables.Fromthemid-1930stheshoeswereoperatedwithoilpressureinasmallwheelcylinderandpistons(asi

5、nthepicture),thoughsomevehiclescontinuedwithpurely-mechanicalsystemsfordecades.Somedesignshavetwowheelcylinders.Theshoesindrumbrakesaresubjecttowearandthebrakesneededtobeadjustedregularlyuntiltheintroductionofself-adjustingdrumbrakesinthe1950s.Inthe1

6、960sand1970sbrakedrumsonthefrontwheelsofcarsweregraduallyreplacedwithdiscbrakesandnowpracticallyallcarsusediscbrakesonthefrontwheels,withmanyofferingdiscbrakesonallwheels.However,drumbrakesarestilloftenusedforhandbrakesasithasprovenverydifficulttodes

7、ignadiscbrakesuitableforholdingacarwhenitisnotinuse.Moreover,itisveryeasytofitadrumhandbrakeinsideadiscbrakesothatoneunitservesasbothservicebrakeandhandbrake.Earlytypebrakeshoescontainedasbestos.Whenworkingonbrakesystemsofoldercars,caremustbetakennot

8、toinhaleanydustpresentinthebrakeassembly.TheUnitedStatesFederalGovernmentbegantoregulateasbestosproduction,andbrakemanufacturershadtoswitchtonon-asbestoslinings.Ownersinitiallycomplainedofpoorbrakingwiththereplacements;however,technologyeventuallyadv