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JAPANESEAUTOMOBILESTANDARDJAS0C712-82BenchTestProcedureforthePerformanceofPowerSteeringPump1.ScopeThisstandardcoversthebenchtestprocedurefortheperformanceofoilpumpsforautomobilepowersteeringsystems.Remark:Inthisstandard,unitsandnumericalvaluesgivenin{}arebasedontheInternationalSystemofUnits(SI),andaregivenforreference.2.Purposelhepurposeofthisstandardistoestablishageneralbenchtestprocedurefortheperformanceofpumps.3.DefinitionsForthepurposesofthisstandard,thefollowingdefinitionsareapplied.PreferrednumberofrevolutionsShallrefertothepreferrednumberofrevolutionsperminuteofapumpusedonavehicle.NoloadpressureShallrefertothepowersteeringsystempressure,generallybelow5kgf/cm2{0.5MPa1,assumedtoindicateinitsneutralposition.ReliefpressureShallrefertothepresetpressuresetonareliefvalvewhichallowstheworkingfluidtoescapewhenthesystempressureexceedsthepresetvalue.InputtorqueShallrefertothetorquerequiredtodrivethepump.4.KindsofTestThefollowingkindsoftestarespecifiedinthisstandard.Testontheeffectofthenumberofrevolutionsondeliveryflow(N-Qcharacteristictest)Testontheeffectofdeliverypressureondeliveryflow(P-Qcharacteristictest)ReliefpressuretestInputtorquetestNoisetestLeaktest5.GeneralTestConditionsThefollowingtestconditionsshallbeusedunlessotherwisespecified.Ambienttemperatureshall'bebasedonJIS28703(StandardConditionsforTesting)Grade4or20115OC.WorkingfluidShallbeasagreedbetweenthepartiesconcerned.TemperatureofworkingfluidShallbe55OCfAirbleedingPriortoanytest,thepumpandthetestingsystemshallbebledsufficiently.Break-inPriortoanytest,apumptobetestedshallbesubjectedtoaproperamountofbreak-in.MeasuringinstrumentAsuitablemeasuringinstrumentorinstrumentsshallbeusedforthetestconcerned.Particularlyconvertingdeliveryflowintoanelectricalsignal,themeasuringinstrumentshallbecalibratedbeforeatestisperformed.OperationWhenanX-Yrecorderisused,thenumberofrevolutionsandthepressureshallbechangedataratewithwhichtheX-Yrecordercanfollow.5c.6.TestPumpApumptobetestedshalleitherbere-adjustedunderofficialsupervision,removedwhollyfromthevehicle,orreinstalled.7.TestingMethod7.1TestonEffectofNumberofRevolutionsonDeliveryFlow(N-0characteristicTest)Thistestshallbeusedtomeasurethedeliveryflowofapumpatdifferentnumbersofrevolutionsperminutewhileholdingdeliverypressureconstant.(1)InstrumentationShowninFig.1.ApplicableStandard:JISC1502-1977SoundLevelMetersReferenceStandard:JIS28703-1976StandardConditionsforTestingJISB0118-1970GlossaryofTermsforOilHydraulicsJISB0125-1972GraphicalSymbolsforFluidPowerDiagramsJASOC711-79BenchTestProcedureforthePerformanceofIntegralType,PowerSteeringJAS0C712-82Fig.1BlockDiagramforMeasuringN-OCharacteristicX-Yrecorder///II8I8/I,IPressuregaugeI1Variable-speedmotorT--wTachometer/WStopvalveorbalance-typereliefvalvepumptobetested(jmOiltankThermometer(2)TestConditions@NumberofrevolutionsShallbewithintherangeofpreferredrevolutions.@DeliverypressureShallbeno-loadpressureunlessotherwisespecified.Remark:Whereotherthanno-loadpressurevaluesarerequiredfortesting,30kgf/cmZ{3.0MPa},50kgf/cma{5.OMPa}arerecommended.(3)TestProcedureAtestprocedureshallconsistof(I),varyingthenumberofrevolutionsgraduallyfromthelowesttothehighestvaluewhileaconstantdeliverypressureismaintainedbymeansofcontrolingstopvalveorabalance-typereliefvalve,and(21,takingasuccessiverecordofthedeliveryflowaccordingtothechangesofrpms.@ThemeasurementsshallberecordedontheX-YrecorderwithgraphpapershowninAttachedTable2.@TestresultsandcommentsshallbefilledappropriatelyinaformshowninAttachedTable1.(4)Recording7.2TestonEffectofDeliveryPressureonDeliveryThistestshallbeusedtomeasurethedeliveryflowofapumpatdifferentdeliverypressureswhileholdingpumpspeedconstant.Flow(P-OCurveTest)(1)InstrumentationShowninFig.2.2JAS0C712-82Fig.2BlockDiagramforMeasuringP-QCharacteristicX-Yrecorder/I//,,///I,PressurepickupVariable-speedmotororwith,speedchangegear!/Stopvalveorbalance-typereliefvalveTachometerpumptobetested&-i!!OiltankThermometerTestConditions0TemperatureofworkingfluidShallbe55*5OCor80I5OC.@DeliverypressureShallbebetweentheno-loadandpumpreliefpressufes.@NumberofrevolutionsShallbe600rpmandvaluesagreeduponbetweenthepartiesconcerned.TestProcedureAtestprocedureshallconsistof(1),settingthepumpatspecifiedvaluesofrpmandno-loadpressure,(2),graduallythrottlingthestopvalveorthebalance-typereliefvalvewhilecontrolingthespeedchangegearinordertomaintaintherpm,and(31,takingasuccessiverecordofdeliveryflowaccordingtothechangesofdeliverypressures.Fig.3BlockDiagramforMearuingReliefPressure(4)Recording@ThemeasurementsshallberecordedontheX-YrecorderwithgraphpapershowninAttachedTable3.@ITestresultsandcommentsshallbefilledappropriatelyinaformshowninAttachedTable1.7.3ReliefPressureTestThistestshallbeusedtomeasurethereliefpressureofapump,andmaybeconductedtogetherwithatestspecifiedin7.2.(1)InstrumentationShowninFig.3.TachometerPressuregaugenVariable-speedmotororwithspeedchangegearStopvalveorbalance-typereliefvalveT-o2,pumptobetestedoiltankThermometer3JAS0C712-82L(2)TestConditionsNumberofrevolutions:Shallbe600rpmorvaluesagreeduponbet