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【英文标准名称】:StandardTestMethodforLowTemperatureViscosityofDriveLineLubricantsinaConstantShearStressViscometer
【原文标准名称】:恒定剪切应力粘度计中传动线路润滑剂的低温粘度的标准试验方法
【标准号】:ASTMD6821-2002(2007)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:apparentviscosity;low-temperatureflowproperties;low-temperatureviscosity;mini-rotaryviscometer;viscosity;yieldstress;Apparentviscosity;Automatictransmissionfluids;Calibration--petroleumanalysisinstrumentation;Drivelinelubricants;Gea
【摘要】:Viscosityofdrivelinelubricantsatlowtemperatureiscriticalforbothgearlubricationandthecirculationofthefluidinautomatictransmissions.Forgearoils(GOs),theissueiswhetherthefluidcharacteristicsaresuchthattheoilwillflowintothechanneldugoutbythesubmergedgearsastheybeginrotatingandre-lubricatingthemastheycontinuetorotate.Forautomatictransmissionfluids,torque,andtractorfluidstheissueiswhetherthefluidwillflowintoapumpandthroughthedistributionsystemrapidlyenoughforthedevicetofunction.Thelowtemperatureperformanceofdrivelinelubricantflowcharacteristicswasoriginallyevaluatedbythechanneltest.Inthistest,apanwasfilledtoaspecifieddepthofapproximately2.5cmandthencooledtotesttemperature.Thetestwasperformedbyscrapingachannelthroughthefulldepthofthefluidandacrossthelengthofthepanafterithadsoakedattesttemperatureforaspecifiedtime.Thetimeittookthefluidtocoverthechannelwasmeasuredandreported.ThechanneltestwasreplacedbyTestMethodD2983in1971.TheresultsofthistestprocedurecorrelatewiththeviscometricmeasurementsobtainedinTestMethodD2983.Thecorrelationobtainedis:where:V

【中国标准分类号】:E34
【国际标准分类号】:75_100
【页数】:5P.;A4
【正文语种】:英语