齿轮疲劳试验Back-to-back_gear_testing

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1、Back-to-BackGearTestingJishanZhangDesignUnit,NewcastleUniversity1TypicalGearFailureModes•Pitting(macropitting)•Micropitting•Casecrushing•Bending•Scuffing2TypicalFailureModesMacropittingµpittingMicropittingMacropits3TypicalFailureModesMicropitting•Greyorglitterinappearancebynakedeyes•Smallinsiz

2、e(5~10µminlength)•Shallow,thedepthisbetween5µm-20µm•Orientingagainstthedirectionoftractiveforce•occursinthededendum,oraddendum,orbothbutseldomatthepitchline4TypicalFailureModesMacropitting5TypicalFailureModesCaseCrushing6TypicalFailureModesBendingFatigue7TypicalFailureModesScuffing8CapacityofDUGear

3、TestRigGeartestrigiscapableofgeneratingalltypicalgearfailuremodesandshowinggeargeneralperformance:•Contactfatigue(macropitting,micropittingandcasecrushing)•Bendingfatigue•Scuffing•Noiseandvibration•Contactpattern•Efficiency•Others9PurposeofGearTestingGeartestrigismainlyusedfor:Variables•macro-geome

4、try1.ContactfatigueS-N•micro-geometrycurvedetermination•material•heattreatment2.Gearperformance•surfacetreatmentverificationand•manufacturingprocess•surfaceengineeringcomparison•lubricationoil•oiltemperature•nozzleposition•…10GeneratingGearS-NCurveHowtosetloadlevels•MaximumPacking(5loadlevels,atlea

5、st5datapointseachloadlevel)•StandardPacking(12–16datapoints)•MinimumPacking(7–10datapoints)11GearPerformanceVerificationandComparison1.AcceleratedtestHigherthandesignedloadisusuallyusedinordertogenerateresultsinareasonabletime,20%increaseincontactstressiscommon.However,beawarethatthefailuremodemayc

6、hangeiftheloadistoohigh.2.Refertothewidelyrecognisedtestproceduresorstandards:•MicropittingtestFVAinformationsheet,July1993•ScuffingtestChinesenationalstandardGB/T13672-199212Back-to-backGearTestRig75mmCENTREDISTANCETESTRIG•4testrigsinstalled•CentreDistance:75mmSpeed:0-6000rpm•GearRatio:1.5:1Max.To

7、rque:400N•Facewidth:10&15mmMax.Powerat6000rpm:250kW•Module:1to4mmDriveMotor:5.5kW13Back-to-backGearTestRig91.5mmCENTREDISTANCETESTRIG2testrigsinstalled,onebeingmanufactured•CentreDistance:91.5mmSpeed:0to600