BS 3170-1972

BRITISHSTANDARDBS3170:1972SpecificationforFlexiblecouplingsforpowertransmissionLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,TueJun2609:20:29GMT+00:002007,UncontrolledCopy,(c)BSIBS3170:1972ThisBritishStandard,havingbeenapprovedbytheMechanicalEngineeringIndustryStandardsCommittee,waspublishedundertheauthorityoftheExecutiveBoardon30March1972©BSI08-1999FirstpublishedNovember1959FirstrevisionMarch1972ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceMEE/36Draftforcomment70/35265ISBN580074404Co-operatingorganizationsTheMechanicalEngineeringIndustryStandardsCommittee,underwhosesupervisionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowingGovernmentdepartmentsandscientificandindustrialorganizations:Thescientificandindustrialorganizationsmarkedwithanasteriskintheabovelist,togetherwiththefollowing,weredirectlyrepresentedonthecommitteeentrustedwiththepreparationofthisBritishStandard.AssociatedOfficesTechnicalCommitteeEngineeringEquipmentUsers’Association*AssociationofConsultingEngineersGasCouncilAssociationofHydraulicEquipmentInstitutionofCivilEngineersManufacturersLtd.InstitutionofGasEngineersAssociationofMiningElectricalandInstitutionofHeatingandVentilatingMechanicalEngineersEngineersBritishChemicalPlantManufacturers’InstitutionofMechanicalEngineersAssociationInstitutionofMechanicalEngineersBritishCompressedAirSociety(AutomobileDivision)BritishElectricalandAlliedManufacturers’InstitutionofPlantEngineersAssociationInstitutionofProductionEngineersBritishGearManufacturers’Association*LocomotiveandAlliedManufacturers’BritishInternalCombustionEngineAssociationofGreatBritainManufacturers’AssociationLondonTransportExecutiveBritishMechanicalEngineeringMachineToolTradesAssociationConfederation*MinistryofDefenceBritishPumpManufacturers’Association*MinistryofDefence,ArmyDepartmentBritishSteelIndustry*NationalCoalBoardCrownAgentsforOverseaGovernmentsandNationalPhysicalLaboratory(DepartmentofAdministrationsTradeandIndustry)DepartmentofEmploymentandProductivityRoyalInstituteofBritishArchitects(H.M.FactoryInspectorate)TelecommunicationsEngineeringDepartmentoftheEnvironmentManufacturingAssociationDepartmentofTradeandIndustryWaterTubeBoilermakers’AssociationDepartmentofTradeandIndustry—NationalEngineeringLaboratoryElectricityCouncil,theCentralElectricityGeneratingBoardandtheAreaBoardsinEnglandandWalesAssociationofBritishCorrespondenceCollegesInstituteofMarineEngineersCouncilofBritishManufacturersofPetroleumEquipmentAmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,TueJun2609:20:29GMT+00:002007,UncontrolledCopy,(c)BSIBS3170:1972©BSI08-1999iContentsPageCo-operatingorganizationsInsidefrontcoverForewordii1Scope12Definitions13Performanceunderoperatingconditions34Specificationofoperatingconditions35Balancingofcouplings46Alignmentofdrivinganddrivenshafts47Dimensionsofbores,limitsandfits48Components49Markingforassembly410Guarding4AppendixANotesonmethodsofcheckingangularandparallelalignmentofcouplings5Figure1—Displacementforces2Figure2—Methodofcheckingangularandparallelmisalignment6LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,TueJun2609:20:29GMT+00:002007,UncontrolledCopy,(c)BSIBS3170:1972ii©BSI08-1999ForewordThisstandardmakesreferencetothefollowingBritishStandardsandCodeofPractice.BS1649,Guardsforshaftcouplings.BS3692,ISOmetricprecisionhexagonbolts,screwsandnuts.BS3763,TheInternationalSystemofunits(SI).BS4168,Hexagonsocketscrewsandwrenchkeys—metricseries.BS4183,Machinescrewsandmachinescrewnuts—metricseries.BS4235,Metrickeysandkeyways—Part1:Parallelandtaperkeys.BS4320,Metalwashersforgeneralengineeringpurposes.BS4464,Springwashersforgeneralengineeringandautomobilepurposes(metricseries).BS4500,ISOlimitsandfits.BS4506,Shaftends.BS....,Shaftfitmentbores1).CP3004,Guardingofmachinery.Thefirsteditionofthisstandardpublishedin1959entitled“Characteristicsofflexiblecouplingsforpowertransmission”waspreparedundertheauthorityoftheMechanicalEngineeringIndustryStandardsCommitteeandrelatedtomechanicaldevicesforflexiblycouplingadrivingtoadrivenshaftotherthanthosedevicesproperlyreferredtoasflexibleshaftsoruniversaljoints.Thepurposeofthisstandard,whichispreparedunderthesameauthority,istobringtogether,underamoreappropriatetitle,informationofassistancetothoseengagedinchoosingcouplings.Itisnottheintentiontoestablishadimensionalstandardforflexibleshaftcouplings.Thefollowingrelatedstandardhasalsobeenpublished:BS3092,Dimensionsofmainfrictionclutches,mainpower-take-offassembliesandassociatedattachmentsfori.c.engines.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to6andabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbei