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鼓式凸轮式选换挡执行机构效率分析 Title:EfficiencyAnalysisofDrum-ShapedandCam-ShapedShiftingMechanismsinTransmissionSystems Introduction: Inthefieldofautomotiveengineering,transmissionsystemsplayacrucialroleinensuringefficientpowertransferfromtheenginetothewheels.Theshiftingmechanismwithinthetransmissionsystemallowsforthesmoothandpreciseengagementofgears,facilitatingthedesiredtorqueandspeedratios.Onekeyaspecttoconsiderwhendesigningashiftingmechanismisitsefficiency,asitdirectlyimpactstheoverallperformanceandfuelefficiencyofthevehicle.Thispaperaimstoanalyzetheefficiencyoftwocommonlyusedshiftingmechanisms,namelydrum-shapedandcam-shapedmechanisms,intransmissionsystems. 1.Drum-ShapedShiftingMechanism: Thedrum-shapedshiftingmechanismisawidelyuseddesignduetoitssimplicityandreliability.Itconsistsofarotatingdrumwithmultiplegroovesordetentsthatcorrespondtodifferentgearpositions.Ashiftingfork,controlledbythedriveroranautomatedsystem,engageswiththegroovestomovethegears.Theefficiencyanalysisfocusesontwomainaspects: 1.1MechanicalEfficiency: Themechanicalefficiencyofthedrum-shapedshiftingmechanismreferstothepowerlossesoccurringduetofrictionandothermechanicallosseswithinthesystem.Theselossescanbeanalyzedthroughmathematicalmodeling,consideringfactorssuchascontactfriction,lubrication,andmaterialproperties.Experimentalvalidationcanalsobeconductedtocorrelatethemathematicalmodelwithactualperformancemeasurements. 1.2ThermalEfficiency: Thethermalefficiencyofthedrum-shapedshiftingmechanismreferstothepowerlossesoccurringduetoheatgenerationwithinthesystem.Frictionandengagementbetweentheshiftingforkandgroovescanleadtolocalizedheating,potentiallyaffectingtheoverallefficiencyanddurabilityofthemechanism.Thermalsimulationsandmeasurementscanbeperformedtoquantifyandoptimizetheselosses. 2.Cam-ShapedShiftingMechanism: Thecam-shapedshiftingmechanismisanalternativedesignthatutilizesacamprofiletocontrolgearengagement.Thecamprofileactuatestheshiftingfork,whichmovesthegearstothedesiredpositions.Theefficiencyanalysisofthec