文献翻译-盘式制动器.doc

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1、附录ADiscBrakesDiscbrakesareusedonthefrontwheelsofmostcarsandonallfourwheelsonmanycars.Adiscrotorisattachedtothewheelhubandrotateswiththetireandwheel.Whenthedriverappliesthebrakes,hydraulicpressurefromthemastercylinderisusedtopushfrictionliningsagainsttherotortostopit.Inthediscbrak

2、erotorassembly,therotorisusuallymadeofcastiron.Thehubmaybemanufacturedasonepiecewiththerotororintwoparts.Therotorhasamachinedbrakingsurfaceoneachface.Asplashshield,mountedtothesteeringknuckle,protectstherotorfromroadsplash.Arotormaybesolidorventilated.Ventilateddesignshavecooling

3、finscastbetweenthebrakingsurfaces.Thisconstructionconsiderablyincreasesthecoolingareaoftherotorcasting.Also,whenthewheelisinmotion,therotationofthesefan-typefinsintherotorprovidesincreasedaircirculationandmoreefficientcoolingofthebrake.Discbrakesdonotfadeevenafterrapid,hardbrakea

4、pplicationsbecauseoftherapidcoolingoftherotor.Thehydraulicandfrictioncomponentsarehousedinacaliperassembly.Thecaliperassemblystraddlestheoutsidediameterofthehubandrotorassembly.Whenthebrakesareapplied,thepressureofthepistonsisexertedthroughtheshoesina‘clamping’actionontherotor.Be

5、causeequalopposedhydraulicpressuresareappliedtobothfacesoftherotorthroughoutapplication,nodistortionoftherotoroccurs,regardlessoftheseverityordurationofapplication.Therearemanyvariationsofcaliperdesigns,buttheycanallbegroupedintotwomaincategories:movingandstationarycaliper.Thecal

6、iperisfixedinonepositiononthestationarydesign.Inthemovingdesign,thecalipermovesinrelationtotherotor.Mostlate-modelcarsusethemovingcaliperdesign.Thisdesignusesasinglehydraulicpistonandacaliperthatcanfloatorslideduringapplication.Floatingdesigns‘float’ormoveonpinsorbolts.Inslidingd

7、esigns,thecalipersidewaysonmachinedsurfaces.Bothdesignsworkinbasicallythesameway.Inthesinglepistonfloatingcaliper,thesingle-pistoncaliperassemblyisconstructedfromasinglecastingthatcontainsonelargepistonboreintheinboardsectionofthecasting.Inboardreferstothesideofthecastingnearestt

8、hecenterlineofthecarwhenthecaliperismoun