外文翻译--汽车后轮驻车制动器的特点与维修.doc
附录CARREARPARKINGBRAKEISWELLKNOWNCHARACTERISTICSANDMAINTENANCEPARKINGBRAKE,THECARMUSTHAVEONEOFTHEBRAKINGDEVICEIVECOSECONDGENERATIONPRODUCTSINVEHICLEBRAKES,PARKINGBRAKEISAMECHANICALCONTROLMECHANISMANDTHEREARDRUMBRAKECOMBINATIONSUCHASTRUCTURE,SOTHATNOTONLYAFTERTHEBRAKEDRUMBRAKEANDPARKINGBRAKEALSOPLAYEDAROLEWITHTHEUSEOFREARDISCBRAKE,TURINVVEHICLEPARKINGBRAKEWITHTHEREARBRAKESWILLBEFIXEDINTHEFORMANDCHANGEIFTHEREARWHEELSWITHDRUMBRAKES,WHILEMAINTAININGTHEBASICSTRUCTUREOFTHEORIGINALSECONDGENERATIONPRODUCTS；THEUSEOFADISCBRAKE,REARWHEELWILLHAVETOCONFIGUREADEDICATEDPARKINGBRAKEONTHEDISCBRAKEISCONCERNED,THEREISTHESTRUCTUREWITHTHEPARKINGBRAKEDISCBRAKE,THEPARKINGBRAKINGFORCEACTSONTHEBRAKEDISCSONBOTHSIDESOFTHEWORKSURFACE,SUCHABRAKECOMPLEXSTRUCTURE,RELATIVELYSOMEWHATLESSRELIABLETURINVCARSEQUIPPEDWITHDUALPISTONSLIDINGFRONTDISCBRAKESHAVESPECIFICALLYSETUPAFTERTHEPARKINGBRAKETHEROLEOFTHEPARKINGBRAKEFORCETOTHEBRAKEDRUMINNERDISKONTHEWORKSURFACE,SOTHATTHEBRAKEDISCHASTWOSEPARATEFRICTIONSURFACE,LIFECANBEIMPROVED,BRAKECALIPERISALSOSIMPLIFIEDTHESTRUCTURETURINVCARREARPARKINGBRAKEDEVICEMANIPULATEDBYAMECHANICALPARKINGBRAKEANDSPECIALCLIMATEOFTWOPARTSBRAKEDISCFORTHETRAFFIC,SHAREDPARKINGBRAKEPARTS1,MECHANICALCONTROLMECHANISMTOMAINTAINTHEBASICSTRUCTUREOFTHEORIGINALSECONDGENERATIONPRODUCTS,MAINLYCOMPOSEDOFPIECESWITHAHANDLE,THEFIRSTWIRECABLE,RATCHETPLATE,ADJUSTTHETHREADEDSLEEVE,LOCKINGNUT,AFTERTHEWIRECABLEANDTHEGUIDEDISCANDSOON2,THESPECIALSTRUCTUREANDPRINCIPLEOFTHEPARKINGBRAKEDISCBRAKEAFTERTHEMATCHWITHASPECIALPARKINGBRAKE,PARKINGBRAKEAFTERTHESPECIALBOTTOMBRACKETTHROUGHEIGHTHOLES,ANDTHEREARAXLERELATIVETOTHEFIXEDAXLESHAFTFLANGEBOLTSBEFOREANDAFTERTHEFRICTIONSHOEUPPERANDLOWERENDSAREPULLEDTIGHTAGAINSTTHERETURNSPRINGONTHEROLEOFREGULATIONUNDERTHEPULLPINANDARMINTHEMIDDLEANDTHEBOTTOMTHROUGHTHEACTIVESUPPORTUNDERWRITINGPHASESLIDETHEGEARONTHEPINONTHEREGULATORCANADJUSTTHEELONGATIONORSHORTENINGTHELENGTHOFSALESTOADJUSTTHEFRICTIONINSIDETHESHOEANDDRUMBRAKEDISCSPACEROLEINPULLINGARM,ITISSUBJECTTOMANIPULATIONAFTERTHEWIRECABLE,WHENTHEPULLTHEHANDBRAKELEVER,THEROLEWILLBETHECENTRALAXISOFTHEPINPULLINGARMASAFULCRUM,THEFRICTIONSHOEBEFOREANDAFTERDISTRACTION,SOTHATTHEDRUMWITHANEFFECTIVEBRAKEDISCFRICTIONTORQUE,ANDTHUSPLAYAROLEINTHEPRIVATEPARKINGBRAKEPARKINGBRAKEINTHEBRAKEPLATEBRACKET,ANDANOTHERTWOHOLESFORTHEINSTALLATIONOFREARBRAKECLAMPASSEMBLYAFTERTHEBANDDRUMANDWHEELBRAKEDISCWILLBEYI,AFTERTHESPECIALPARKINGBRAKE,BRAKECALIPERASSEMBLY,ANDSOORDERLYTOGETHER3,SPECIALPARKINGBRAKEAFTERTHEDECOMPOSITIONANDSYNTHESISINVEHICLEREARWHEELSWHENTHEREMOVALOFTHEYI,ANUMBEROFCOMPONENTSSUCHASREARBRAKEDISC,YOUCANSPECIALPARKINGBRAKEONTHEDECOMPOSITIONANDSYNTHESIS,THEBASICPROCESSSTEPSAREASFOLLOWSFROMTHEFRONTBUFRICTIONSHOE,REMOVETHERETURNSPRING,SPINOFFTHESHORTLENGTHADJUSTMENT,REMOVETHEFRICTIONBETWEENTHESUPPORTSHOEUNDERWRITINGFOLDER,YOUCANREMOVETHEFRICTIONSHOEREMOVETHEBRANCHUNDERWRITING,HOULASUOLOOSEPARKINGBRAKEPULLARMCONNECTEDWITHTHEROLE,REMOVETHEEFFECTOFTHESECONDARMPULLTHEWHEELSPEEDSENSORMOUNTINGBRACKETREMOVED,YOUCANREMOVETHESENSORREMOVETHEAXLECASINGUNDERTHEFLANGEANDTHEEIGHTMOUNTINGBOLTS,THENREMOVETHEPARKINGBRAKEBOTTOMBRACKETACCORDINGTOTHEREQUIREMENTSOFTHEDRUMBRAKESONTHEPARTSREMOVEDFORCLEANINGCHECKS,ABANDONEDEXCEEDEDTHEDIFFERENCEOFWEARPARTSSYNTHESISBYDECOMPOSITIONOFTHEREVERSESTEPSAFTERSYNTHESIS,MEASUREDWITHAVERNIERCALIPERBEFORETHEHINDPIECEDIAMETER,WHILETOGGLEADJUSTMENTPIN1,THEDIAMETERVALUETHAN1720,ASMALL04}1MMAFTERTHEADJUSTMENTOFPARKINGBRAKEPARKINGBRAKEBECAUSETHEBRAKEAFTERTHENONAUTOMATICCOMPENSATINGCLEARANCE,THEUSEOFAPERIODOFTIME,THEBRAKEGAPWILLGRADUALLYINCREASE,REFLECTINGTHETENSIONINTHEHANDLESPINEWHENTHENUMBEROFTEETHAFFECTED,WILLEXCEEDTHENUMBEROFNORMALNUMBEROFTEETHAFFECTED4}6,WHICHWILLAFFECTTHEREARWHEELINVEHICLEPERFORMANCETOTHISEND,PROMPTLYAFTERTHEPARKINGBRAKEADJUSTMENTADJUSTEDASFOLLOWSFROMTHETOPREAROFTHECAR,ANDTOSUPPORTTHEFRAMEBRACKET,THENREMOVETHEREARWHEELS；LOOSENTHEPARKINGBRAKECABLEADJUSTINGSCREWLOCKNUTSETS；REMOVETHETOPLONGAFTERTHEPARKINGBRAKEHOLERUBBERPLUG,THEUSEOFSPECIALTOOLS99,372,249TOGGLEADJUSTMENTPINGEAR,SOTHATBEFOREANDAFTERTHEFRICTIONSHOEDISTRACTION,RESULTINGINHANDCANNOTTURNTHEPLATESOFAR；LOOSEAGAINWITHSPECIALTOOLSTOADJUSTTHEPINGEARASIDE,THESYSTEMFIXEDDISKFREETOROTATEBRAKEGAPOFABOUT02}05MRRI,REBUILTTHERUBBERPLUGINTHEHOLE,REFITTEDTHEREARWHEELS；PARKINGINTHECABPULLINGTEETHSOUNDSYSTEMTOTHETHIRDPOSITIONOFTHEHANDLEANDTIGHTENTHEADJUSTMENTSCREWSETSCANNOTBEPULLEDUPBYHANDUNTILTHEWHEELROTATES；PULLDOWNANDRELEASETHEPARKINGBRAKELEVER3}4,ONTHEWHOLEDEVICEAFTERTHEPARKINGBRAKEADJUSTMENTS,ANDCHECKTHEFINALTIGHTENINGWHENTHEHANDLEIS6MAXIMUMSTROKETEETH,ANDFINALLYTIGHTENTHEADJUSTINGSCREWLOCKNUTSETS,ANDLOWEREDCARS汽车后轮驻车制动器的特点与维修众所周知，驻车制动是汽车必备的制动装置之一。依维柯二代产品的驻车制动装置，是由驻车制动机械操纵机构与后鼓式制动器组合而成。这样的结构，使后鼓式制动器不仅是行车制动器，而且还起到了驻车制动作用。随着后轮盘式制动器的运用，都灵V汽车的驻车制动器将会随着后轮制动器动形式而变化。若后轮采用鼓式制动器，则基本维持原二代产品的结构；若采用盘式制动器，则要配置专用的后轮驻车制动器。就盘式制动器而言，存有带驻车制动结构的盘式制动器，其驻车制动力也作用在制动盘两侧工作表面上，这种制动器结构复杂，可靠性相对稍差。都灵V汽车为配用双活塞滑动前盘式制动器须要，专门设置了后驻车制动器。使其驻车制动力作用在制动盘的内鼓工作表面上，这样使制动盘具有两种分开的摩擦表面，寿命可以提高，制动钳的结构也相应简化。都灵V汽车的后轮驻车制动装置，由机械式操纵和专用候驻车制动器两大部分组成（制动盘为行车、驻车制动器共用件）。1、机械式操纵机构基本维持原二代产品的结构，主要组成件有手柄、前钢丝拉索、棘齿板、调整螺套、锁紧螺母、后钢丝拉索及导盘等。2、专用驻车制动器结构和原理与后盘式制动器相配的专用驻车制动器，专用后驻车制动器通过底板支架上的八个孔，与后桥半轴凸缘用螺栓相固定。前、后摩擦蹄片上下端被回位弹簧紧拉靠在上调节销和下作用拉臂上，中间通过支承销与底板活络相接。拨动上调节销上的齿轮可伸长或缩短调节销的长度，从而可调整摩擦蹄片与制动盘内鼓的间隙。作用拉臂，它受后钢丝拉索的操纵，当拉紧驻车制动手柄时，作用拉臂将以中心轴销为支点，撑开前后摩擦蹄片，使与制动盘内鼓产生有效摩擦力矩，从而起到驻车制动作用在专用驻车制动器的制动底板支架上，另有二只安装孔，以便装置后制动钳总成。带内鼓的后制动盘将和轮毅、后专用驻车制动器、制动钳总成等有序地组合在一起。3、专用后驻车制动器的驻车分解与合成当拆除了后轮毅、后制动盘等若干零部件后，即可对专用驻车制动器进行分解与合成，基本工艺步骤如下从前后摩擦蹄片卜，拆下回位弹簧，旋短调节销长度，拆下摩擦蹄片中间的支承销夹,即可取下摩擦蹄片。
