construction machinery and equipment

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1、ConstructionMachineryandEquipmentConstructionMachineryandEquipmentV01.38No.11AbstractsinEnglishTestandResearchofHydrodynamicRetardersRetarderisanimportantauxiliarybrakingsysteminvehicle'stransmissionsystem.Brakingwitllaretardercandecreasetheweal"oftravelbrake,preven

2、ttravelbrakefailuresandensurethesafetravelingsoretardersarewidelyusedonmodernvehicles.Structureandworkprincipleofahydrodynamicretarderarealia—lyzed.Asetofelectroniccontrolunitisdevelopedaimingattheprinciple.Basedonthevariousrelatedsignalscollectedbyhard-warecircuit.

3、theelectroniccontrolunitrealizesthecontrolofdif-ferentbreakingtorquesunderdifferentgearssothatthevehiclecankeepaconstantspeedondowngrade.Brakingperformanceoftheretarderistestedonatestbenchandapracticalvehiclere—spectively.Testresultsshowthattheretarderpresentsasatis

4、fac—torybrakingundertheconditionsofhighspeedandhighoilchargingwhereasabasicallyconstantbrakingtorqueisprovidedfordowngradevehicleswhileinlowspeedandlowoilcharging.Keywords:HydrodynamicretarderVehiclebrakingTestTorqueMOdel966HWheelLoaderMaintechnicalparameters,struct

5、uralcharacteristicsandsuitableworkconditionsofmodel966Hwheelloaderareexpatiated.Itsmainstructuresincludepowertransmissionsystem,workattach—mentandmachineframe,hydraulicsteeringsystem,attachmenthydraulicsystem,separateheatradiatingsystem,brakingsystem,drivercompartme

6、ntandenginehood.Anelectricallycontrolledhydro-mechanicaltransmissionsystemisadopted,whichfeaturessatisfactorypowerperformanceandhi【ghreliability.Theattach—mentandframeprovidestablestructuresandhighstrengthviaoptimaldesign.Dual-pump—convergingtechnologyisemployedinhy

7、draulicsystemsothatthereishttlepowerlossandfullusageofenginepowerandhighfueleconomyisobtained.AdoubletaperedO-sealingfromGermantechnologyisappliedtohydrauliccircuitsandanoffset-positionedpre-pressurizedoiltankisusedtopre—ventexcessivewearofpumpsandprolongtheirservic

8、elife.Afineoilfilterisaddedtoreduceoilcontaminationandextendoilex—changeintervalswitlltwostagefiltering.Theseparateheatradiat—ingsystemuti