GM_BE TL[1][1].16.0004_Engrg Components Specs - Pulley

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1、GENERALMOTORSENGINEERINGSPECIFICATIONBE.TL.16.0004½Components--Pulley1.0Introduction.ThisspecificationisintendedtocoveraccessorydrivepulleyswithoutintegralballbearingswhicharecoveredbyanIdlerPulleySpecificationno.BE.TL.16.0003.ThisspecificationformsanattachmenttotheIdlerPull

2、eySpecificationandgovernsthepulleyportionoftheassembly.2.0Construction.Thereareseveralpossibleconstructionsfordrive/drivenpulleysA.OnepiecesteelwithnohuborintegralhubB.TwopiecesteelwithweldedorbrazedhubattachmentC.TwopiecesteelwithdoublerforreinforcementD.Aluminumormagnesium

3、onepieceE.Thermoplasticinjectionmoldedwithsteelhub-notethatNorthAmericanapplicationsshallnotuseplasticbacksidepulleysbecauseofexcessivewear,bothbeltandpulley,andmanufacturingvariation.AcceptablequalitypartsareavailableinEuropeonly.F.Thermosetplasticcompressionorinjection/com

4、pressionmoldedwithsteelhub-AlsonotpermittedforbacksideNorthAmericanapplicationandnotrecommendedforgroovesideapplications.AcceptablequalitypartsareusuallyinjectionmoldedandareavailableinEuropeonly.2.1WebConfiguration.-AtthediscretionofthesuppliersupportedbyF.E.A.analysisbased

5、onloadingprovidedbythePowertrainreleaseengineer.Holestoprovideaccessibilitytofastenersbehindthepulleymayberequiredonsomeapplications.PulleyO.D.,offsetandpilot/hub/mountingholeinformationaresuppliedbythereleaseengineerasrequired.2.1.1SensitivityToHubWalking.–Thedesignofthepul

6、leyforhighoffsetoridlerapplicationsmaybesensitivetothephenomenonof“walking”offoftheshaft,evenwithacorrectpressfit.Thisiscausedbyelasticdeformationofthehubinthepresenceofbeltload.Thedesignofthewebsectionisthemostinfluentialindeterminingtheadequacyofthedesigntoresistwalking.De

7、flectionisinherentduetoload,andanoffsetloadwillincreasethedeflection.Thepulleywilldeflectwhereithastheloweststiffness,andthehubpresscanbeovercomeduetodistortionofthebore.Theboreseparatesfromtheshaftlocally,andwillre-contacttheshaftinadifferentlocationduetotheoffsetloadeffect

8、s.Asthepulleyrotates,theentirecircumferenceoftheshaftinagivenplanewilladvan