外文翻译--鼓式制动器

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

2、heterm"drumbrake"usuallymeansabrakeinwhichshoespressontheinnersurfaceofthedrum.Whenshoespressontheoutsideofthedrum,itisusuallycalledaclaspbrake.Wherethedrumispinchedbetweentwoshoes,similartoaconventionaldiskbrake,itissometimescalleda"pinchdrumbrake",althoughsuchbrakesarere

3、lativelyrare.Arelatedtypeofbrakeusesaflexiblebeltor"band"wrappingaroundtheoutsideofadrum,calledabandbrake.History8AdrumbrakeattherearwheelofamotorbikeKawasakiW800Themodernautomobiledrumbrakewasinventedin1902byLouisRenault,thoughaless-sophisticateddrumbrakehadbeenusedbyMayb

4、achayearearlier.Inthefirstdrumbrakes,theshoesweremechanicallyoperatedwithleversandrodsorcables.Fromthemid-1930stheshoeswereoperatedwithoilpressureinasmallwheelcylinderandpistons(asinthepicture),thoughsomevehiclescontinuedwithpurely-mechanicalsystemsfordecades.Somedesignsha

5、vetwowheelcylinders.Theshoesindrumbrakesaresubjecttowearandthebrakesneededtobeadjustedregularlyuntiltheintroductionofself-adjustingdrumbrakesinthe1950s.Inthe1960sand1970sbrakedrumsonthefrontwheelsofcarsweregraduallyreplacedwithdiscbrakesandnowpracticallyallcarsusediscbrake

6、sonthefrontwheels,withmanyofferingdiscbrakesonallwheels.However,drumbrakesarestilloftenusedforhandbrakesasithasprovenverydifficulttodesignadiscbrakesuitableforholdingacarwhenitisnotinuse.Moreover,itisveryeasytofitadrumhandbrakeinsideadiscbrakesothatoneunitservesasbothservi

7、cebrakeandhandbrake.Earlytypebrakeshoescontainedasbestos.Whenworkingonbrakesystemsofoldercars,caremustbetakennottoinhaleanydustpresentinthebrakeassembly.TheUnitedStatesFederalGovernmentbegantoregulateasbestosproduction,andbrakemanufacturershadtoswitchtonon-asbestoslinings.

8、Ownersinitiallycomplainedofpoorbrakingwiththereplacements;however,technologyeventuallyadv