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Calculation of load capacity of bevel gears —Part 30: ISO rating system for bevel and hypoid gears — Sample calculationsCalcul de la capacité de charge des engrenages coniques —Partie 30: Système d'évaluation ISO pour engrenages conique et hypoïde - Type de calculs
TECHNICAL REPORT
ISO/TR10300-30
Reference numberISO/TR 10300-30:2017(E)
First edition2017-12
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ISO/TR 10300-30:2017(E)
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COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright officeCh. de Blandonnet 8 • CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyright@iso.orgwww.iso.org
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Contents Page
Foreword iv
Introduction v
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Symbols and abbreviated terms 2
5 Application 10 5.1 General 10 5.2 Structure of calculation methods 10
Annex A(informative)Sample 1: Rating of a spiral bevel gear pair without hypoid offset according to Method B1 and Method B2 12
Annex B(informative)Sample 2: Rating of a hypoid gear set according to Method B1 and Method B2 65
Annex C(informative) Sample 3: Rating of a hypoid gear set according to Method B1 and Method B2 125
Annex D(informative) Sample 4: Rating of a hypoid gear set according to Method B1 and Method B2 185
Annex E(informative)Graphical representation of the calculation results for Sample 1 to Sample 4 243
Bibliography 246
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of nationalstandards bodies (ISO member bodies). The work of preparing International Standards isnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhich a technical committee has been established has the right to be represented on thatcommittee.Internationalorganizations,governmentalandnon‐governmental,inliaisonwithISO,also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.
Theproceduresused todevelop thisdocument and those intended for its furthermaintenanceare described in the ISO/IEC Directives, Part 1. In particular, the different approval criterianeededforthedifferenttypesofISOdocumentsshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seewww.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be thesubjectofpatent rights. ISOshallnotbeheld responsible for identifyinganyor all suchpatentrights.DetailsofanypatentrightsidentifiedduringthedevelopmentofthedocumentwillbeintheIntroductionand/orontheISOlistofpatentdeclarationsreceived(seewww.iso.org/patents).
Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.
Foranexplanationonthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressions related to conformity assessment, aswell as information about ISO's adherence totheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT),seethefollowingURL:www.iso.org/iso/foreword.html.
ThisdocumentwaspreparedbyTechnicalCommitteeISO/TC60,Gears,SubcommitteeSC2,Gear capacity calculation.
AlistofallpartsintheISO10300seriescanbefoundontheISOwebsite.
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Introduction
The ISO10300 series consists of International Standards, Technical Specifications (TS) andTechnical Reports (TR) under the general title Calculation of load capacity of bevel gears(seeTable1).
— International Standards contain calculation methods that are based on widely acceptedpracticesandhavebeenvalidated.
— TScontaincalculationmethodsthatarestillsubjecttofurtherdevelopment.
— TRcontaindatathatisinformative,suchasexamplecalculations.
TheproceduresspecifiedinISO10300‐1toISO10300‐19coverfatigueanalysesforgearrating.The procedures described in ISO10300‐20 to ISO10300‐29 are predominantly related to thetribological behaviour of the lubricated flank surface contact. ISO10300‐30 to ISO10300‐39include example calculations. The ISO10300series allows the addition of new parts underappropriatenumberstoreflectknowledgegainedinthefuture.
RequestingstandardizedcalculationsaccordingtoISO10300withoutreferringtospecificpartsrequirestheuseofonlythosepartsthatarecurrentlydesignatedasInternationalStandards(seeTable1forlisting).Whenrequestingfurthercalculations,therelevantpartorpartsofISO10300needtobespecified.UseofaTechnicalSpecificationasacceptancecriteria foraspecificdesignneedtobeagreedinadvancebetweenmanufacturerandpurchaser.
Table 1 — Overview of ISO 10300
Calculation of load capacity of bevel gears International
Standard Technical
Specification Technical
Report
Part 1: Introduction and general influence factors X
Part 2: Calculation of surface durability (pitting) X
Part 3: Calculation of tooth root strength X
Part 4 to 19: to be assigned
Part 20: to be assigned for scuffing of bevel and hypoid gears
Part 21 to 29: to be assigned
Part 30: ISO rating system for bevel and hypoid gears — Sample calculations
X
At the timeofpublicationof thisdocument, someof theparts listedherewereunderdevelopment.Consult the ISOwebsite.
Thisdocumentwaspreparedwithsamplecalculationsfordifferentbevelgeardesigns.Theyareintended for users of the ISO10300 series to follow awhole calculation procedure formula byformula. Practical experience has shown that this way, to get into a complex subject, is veryhelpful.
On theotherhand, thisdocument isnot intended foruseby theaverageengineer.Rather, it isaimedatthewell‐versedengineercapableofselectingreasonablevaluesfortheparametersandfactorsintheseformulaebasedonknowledgeofsimilardesignsandonawarenessoftheeffectsbehindtheseformulae.
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TECHNICAL REPORT ISO/TR 10300-30:2017(E)
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Calculation of load capacity of bevel gears — Part 30: ISO rating system for bevel and hypoid gears — Sample calculations
1 Scope
This document provides sample calculations for different bevel gear designs, how the loadcapacity is numerically determined according to the methods and formulae of theISO10300series.The initialgeometricgeardatanecessary for thesecalculations inaccordancewithISO23509.
Theterm“bevelgear”isusedtomeanstraight,helical(skew),spiralbevel,zerolandhypoidgeardesigns. Where this document pertains to one or more, but not all, the specific forms areidentified.
The manufacturing process of forming the desired tooth form is not intended to imply anyspecificprocess,butrathertobegeneralinnatureandapplicabletoallcalculationmethodsoftheISO10300series.Thefactthattherearebevelgeardesignswithtaperedteethandotherswherethetoothdepthremainsconstantalongthefacewidth(uniformdepth)doesnotdemandtoapplyMethodB2forthefirstandMethodB1forthesecondtoothconfiguration.
Theratingsystemof theISO10300series isbasedonvirtualcylindricalgearsandrestrictedtobevelgearswhosevirtualcylindricalgearshavetransversecontactratiosofεvα<2.Additionally,thegivenrelationsarevalidforbevelgearsofwhichthesumofprofileshiftcoefficientsofpinionandwheeliszero(seeISO23509).
WARNING:Theuseriscautionedthatwhentheformulaeareusedforlargeaveragemeanspiralangles, (βm1 +βm2)/2>45°, for effective pressure angles,αe>30° and/or for large facewidths,b>13mmn,thecalculatedresultsoftheISO10300seriesshouldbeconfirmedbyexperience.
2 Normative references
Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutes requirementsof thisdocument.Fordatedreferences,only theeditioncitedapplies.For undated references, the latest edition of the referenced document (including anyamendments)applies.
ISO10300‐1:2014,Calculation of load capacity of bevel gears — Part 1: Introduction and general influence factors
ISO10300‐2:2014, Calculation of load capacity of bevel gears — Part 2: Calculation of surface durability (pitting)
ISO10300‐3:2014, Calculation of load capacity of bevel gears — Part 3: Calculation of tooth root strength
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO10300‐1 andISO10300‐2apply.
ISO and IEC maintain terminological databases for use in standardization at the followingaddresses:
— ISOOnlinebrowsingplatform:availableathttps://www.iso.org/obp
— IECElectropedia:availableathttps://www.electropedia.org/
4 Symbols and abbreviated terms
Forthepurposesofthisdocument,thesymbolsandunitsgiveninISO10300‐1:2014,Table1andTable2,aswellastheabbreviatedtermsgiveninISO10300‐2:2014,Table1,apply.
Table 2 — Symbols and units used in ISO 10300 (all parts)
Symbol Description or term Unit
a hypoidoffset mm
arel relativehypoidoffset —
av centredistanceofvirtualcylindricalgearpair mm
avn centredistanceofvirtualcylindricalgearpairinnormalsection mm
b facewidth mm
bb relatedbasefacewidth —
bce calculatedeffectivefacewidth mm
beff effectivefacewidth(e.g.measuredlengthofcontactpattern) mm
bv facewidthofvirtualcylindricalgears mm
bveff effectivefacewidthofvirtualcylindricalgears mm
cham meanaddendumfactorofwheel —
cv empiricalparametertodeterminethedynamicfactor —
cγ meanvalueofmeshstiffnessperunitfacewidth N/(mm·µm)
cγ0 meshstiffnessforaverageconditions N/(mm·µm)
c’ singlestiffness N/(mm·µm)
c0’ singlestiffnessforaverageconditions N/(mm·µm)
de outerpitchdiameter mm
dm meanpitchdiameter mm
dT tolerancediameteraccordingtoISO17485 mm
dv referencediameterofvirtualcylindricalgear mm
dva tipdiameterofvirtualcylindricalgear mm
dvan tipdiameterofvirtualcylindricalgearinnormalsection mm
dvb basediameterofvirtualcylindricalgear mm
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Symbol Description or term Unit
dvbn basediameterofvirtualcylindricalgearinnormalsection mm
dvf rootdiameterofvirtualcylindricalgear mm
dvn referencediameterofvirtualcylindricalgearinnormalsection mm
e exponentforthedistributionoftheloadpeaksalongthelinesofcontact
—
f distancefromthecentreofthezoneofactiontoacontactline mm
fmax maximumdistancetomiddlecontactline mm
fmaxB maximumdistancetomiddlecontactlineatrightsideofthecontactpattern
mm
fmax0 maximumdistancetomiddlecontactlineatleftsideofthecontactpattern
mm
fpt singlepitchdeviation µm
fpeff effectivepitchdeviation µm
fαlim Influencefactoroflimitpressureangle
gc lengthofcontactline(MethodB2) mm
gvα lengthofpathofcontactofvirtualcylindricalgearintransversesection
mm
gvαn relatedlengthofactioninnormalsection —
gJ lengthofactionfrommeanpointtopointofloadapplication(MethodB2)
mm
gη relativelengthofactionwithinthecontactellipse mm
ham meanaddendum mm
ha0 tooladdendum mm
hfm meandedendum mm
hfP dedendumofthebasicrackprofile mm
hm meanwholedepthusedforbevelspiralanglefactor mm
hvfm relativemeanvirtualdedendum —
hFa bendingmomentarmfortoothrootstress(loadapplicationattoothtip)
mm
hN loadheightfromcriticalsection(MethodB2) mm
jen outernormalbacklash mm
k′ contactshiftfactor —
kc clearancefactor —
kd depthfactor —
khap basiccrowngearaddendumfactor(relatedtommn) —
khfp basiccrowngeardedendumfactor(relatedtommn) —
kt circularthicknessfactor —
lb lengthofcontactline(MethodB1) mm
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Symbol Description or term Unit
lb0 theoreticallengthofcontactline mm
lbm theoreticallengthofmiddlecontactline mm
met outertransversemodule mm
mmn meannormalmodule mm
mmt meantransversemodule mm
mred massperunitfacewidthreducedtothelineofactionofdynamicallyequivalentcylindricalgears
kg/mm
m* relatedindividualgearmassperunitfacewidthreferredtothelineofaction
kg/mm
n rotationalspeed min–1
nE1 resonancespeedofpinion min–1
p peakload N/mm
pet transversebasepitch(MethodB2) mm
pmax maximumpeakload N/mm
p* relatedpeakloadforcalculatingtheloadsharingfactor(MethodB1) —
pmn relativemeannormalpitch —
pnb relativemeannormalbasepitch —
pvet transversebasepitchofvirtualcylindricalgear(MethodB1) mm
q exponentintheformulaforlengthwisecurvaturefactor —
qs notchparameter —
rc0 cutterradius mm
rmf toothfilletradiusattherootinmeansection mm
rmpt meanpitchradius mm
rmy0 meantransverseradiustopointofloadapplication(MethodB2) mm
rva relativemeanvirtualtipradius —
rvn relativemeanvirtualpitchradius —
smn meannormalcircularthickness mm
spr amountofprotuberanceatthetool mm
sFn toothrootchordincalculationsection mm
sN one‐halftooththicknessatcriticalsection(MethodB2) mm
u gearratioofbevelgear —
uv gearratioofvirtualcylindricalgear —
vet tangentialspeedatouterend(heel)ofthereferencecone m/s
vetmax maximumpitchlinevelocityatoperatingpitchdiameter m/s
vg slidingvelocityinthemeanpointP m/s
vgpar slidingvelocityparalleltothecontactline m/s
vgvert slidingvelocityverticaltothecontactline m/s
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Symbol Description or term Unit
vmt tangentialspeedatmidfacewidthofthereferencecone m/s
vΣ sumofvelocitiesinthemeanpointP m/s
vΣh sumofvelocitiesinprofiledirection m/s
vΣl sumofvelocitiesinlengthwisedirection m/s
vΣvert sumofvelocitiesverticaltothecontactline m/s
w angleofcontactlinerelativetotherootcone °
xhm profileshiftcoefficient —
xsm thicknessmodificationcoefficient(backlashincluded) —
xsmn thicknessmodificationcoefficient(theoretical) —
xN toothstrengthfactor(MethodB2) mm
xoo distancefrommeansectiontopointofloadapplication mm
yp running‐inallowanceforpitchdeviationrelatedtothepolishedtestpiece
µm
yJ locationofpointofloadapplicationformaximumbendingstressonpathofaction(MethodB2)
mm
y3 locationofpointofloadapplicationonpathofactionformaximumrootstress
mm
yα running‐inallowanceforpitcherror µm
z numberofteeth —
zv numberofteethofvirtualcylindricalgear —
zvn numberofteethofvirtualcylindricalgearinnormalsection —
z0 numberofbladegroupsofthecutter —
A auxiliaryfactorforcalculatingthedynamicfactorKv−C —
A* relatedareaforcalculatingtheloadsharingfactorZLS mm
Asne outertooththicknessallowance mm
B accuracygradeaccordingtoISO17485 —
CF correctionfactoroftoothstiffnessfornon‐averageconditions —
Clb correctionfactorforthelengthofcontactlines —
CZL,CZR,CZV constantsfordetermininglubricantfilmfactors —
E modulusofelasticity,Young’smodulus N/mm2
E, G, H auxiliaryvariablesfortoothformfactor(MethodB1) —
F auxiliaryvariableformid‐zonefactor —
Fmt nominaltangentialforceatmidfacewidthofthereferencecone N
FmtH determinanttangentialforceatmidfacewidthofthereferencecone N
Fn nominalnormalforce N
Fvmt nominaltangentialforceofvirtualcylindricalgears N
HB Brinellhardness —
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Symbol Description or term Unit
K constant;factorforcalculatingthedynamicfactorKv−B —
Kv dynamicfactor —
Kv* preliminarydynamicfactorfornon‐hypoidgears —
KA applicationfactor —
KF0 lengthwisecurvaturefactorforbendingstress —
KFα transverseloadfactorforbendingstress —
KFβ faceloadfactorforbendingstress —
KHα transverseloadfactorforcontactstress —
KHα* preliminarytransverseloadfactorforcontactstressfornon‐hypoidgears
—
KHβ faceloadfactorforcontactstress —
KHβ−be mountingfactor —
N referencespeedrelatedtoresonancespeednE1 —
NL numberofloadcycles —
P nominalpower kW
Ra =CLA=AAarithmeticaverageroughness µm
Re outerconedistance mm
Rm meanconedistance mm
Rmpt relativemeanbackconedistance —
Rz meanroughness µm
Rz10 meanroughnessforgearpairswithrelativecurvatureradiusρrel=10mm
µm
SF safetyfactorforbendingstress(againstbreakage) —
SFmin minimumsafetyfactorforbendingstress —
SH safetyfactorforcontactstress(againstpitting) —
SHmin minimumsafetyfactorforcontactstress —
T1,2 nominaltorqueofpinionandwheel Nm
Wm2 wheelmeanslotwidth mm
Y1,2 toothformfactorofpinionandwheel(MethodB2) —
Yf stressconcentrationandstresscorrectionfactor(MethodB2) —
Yi inertiafactor(bending) —
YA rootstressadjustmentfactor(MethodB2) —
YBS bevelspiralanglefactor —
YFa toothformfactorforloadapplicationatthetoothtip(MethodB1) —
YFS combinedtoothformfactorforgeneratedgears —
YJ bendingstrengthgeometryfactor(MethodB2) —
YLS loadsharingfactor(bending) —
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Symbol Description or term Unit
YNT lifefactor(bending) —
YRrelT relativesurfaceconditionfactor —
YSa stresscorrectionfactorforloadapplicationatthetoothtip —
YST stresscorrectionfactorfordimensionsofthestandardtestgear —
YX sizefactorfortoothrootstress —
YδrelT relativenotchsensitivityfactor —
Yε contactratiofactorforbending(MethodB1) —
Zi inertiafactor(pitting) —
Zv speedfactor —
ZA contactstressadjustmentfactor(MethodB2) —
ZE elasticityfactor —
ZFW facewidthfactor —
ZHyp hypoidfactor —
ZI pittingresistancegeometryfactor(MethodB2) —
ZK bevelgearfactor(MethodB1) —
ZL lubricantfactor —
ZLS loadsharingfactor(MethodB1) —
ZM‐B midzonefactor —
ZNT lifefactor(pitting) —
ZR roughnessfactorforcontactstress —
ZS bevelslipfactor —
ZW workhardeningfactor —
ZX sizefactor —
αa adjustedpressureangle(MethodB2) °
αan normalpressureangleattoothtip °
αdD,C nominaldesignpressureanglefordriveside/coastside °
αet effectivepressureangleintransversesection °
αeD,C effectivepressureanglefordriveside/coastside °
αf limitpressureangleinwheelrootcoordinates(MethodB2) °
αlim limitpressureangle °
αnD,C generatedpressureanglefordriveside/coastside °
αvet transversepressureangleofvirtualcylindricalgears °
αFan loadapplicationangleattoothtipofvirtualcylindricalgear(MethodB1)
°
αL normalpressureangleatpointofloadapplication(MethodB2) °
βbm meanbasespiralangle °
βm meanspiralangle °
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Symbol Description or term Unit
βv helixangleofvirtualgear(MethodB1),virtualspiralangle(MethodB2)
°
βvb helixangleatbasecircleofvirtualcylindricalgear °
βB inclinationangleofcontactline °
γ auxiliaryangleforlengthofcontactlinecalculation(MethodB1) °
γ′ projectedauxiliaryangleforlengthofcontactline °
γa auxiliaryanglefortoothformandtoothcorrectionfactor °
δ pitchangleofbevelgear °
δa faceangle °
δf rootangle °
εvα transversecontactratioofvirtualcylindricalgears —
εvαn transversecontactratioofvirtualcylindricalgearsinnormalsection —
εvβ facecontactratioofvirtualcylindricalgears —
εvγ virtualcontactratio(MethodB1),modifiedcontactratio(MethodB2) —
εN loadsharingratioforbending(MethodB2) —
εNI loadsharingratioforpitting(MethodB2) —
ζm pinionoffsetangleinaxialplane °
ζmp pinionoffsetangleinpitchplane °
ζR pinionoffsetangleinrootplane °
θ auxiliaryquantityfortoothformandtoothcorrectionfactors —
θmp auxiliaryangleforvirtualfacewidth(MethodB1) °
θa2 addendumangleofwheel °
θf2 dedendumangleofwheel °
θv2 angularpitchofvirtualcylindricalwheel radiant
ξ assumedangleinlocatingweakestsection °
ξh onehalfofanglesubtendedbynormalcirculartooththicknessatpointofloadapplication
°
ρ densityofgearmaterial kg/mm3
ρa0 cutteredgeradius mm
ρF filletradiusatpointofcontactof30°tangent mm
ρFn filletradiusatpointofcontactof30°tangentinnormalsection mm
ρfP rootfilletradiusofbasicrackforcylindricalgears mm
ρrel radiusofrelativecurvatureverticaltocontactlineatvirtualcylindricalgears
mm
ρt radiusofrelativeprofilecurvature(MethodB2) mm
ρva0 relativeedgeradiusoftool —
ρ′ sliplayerthickness mm
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Symbol Description or term Unit
σF toothrootstress N/mm2
σF0 nominaltoothrootstress N/mm2
σFlim nominalstressnumber(bending) N/mm2
σFE allowablestressnumber(bending) N/mm2
σFP permissibletoothrootstress N/mm2
σH contactstress N/mm2
σHlim allowablestressnumberforcontactstress N/mm2
σHP permissiblecontactstress N/mm2
τ anglebetweentangentofrootfilletatweakestpointandcentrelineoftooth
°
ν Poisson’sratio —
ν0 leadangleoffacehobbingcutter °
ν40,ν50 nominalkinematicviscosityoftheoilat40°Cand50°C,respectively mm2/s
ϕ auxiliaryangletodeterminethepositionofthepitchpoint °
ω angularvelocity rad/s
ωΣ anglebetweenthesumofvelocitiesvectorandthetraceofpitchcone °
χX relativestressdropinnotchroot mm−1
χTX relativestressdropinnotchrootofstandardizedtestgear mm−1
Σ shaftangle °
Table 3 — Generally used subscripts in ISO 10300 (all parts)
Subscripts Description
0 tool
1 pinion
2 wheel
A,B,B1,B2,C valueaccordingtoMethodA,B,B1,B2orC
D driveflank
C coastflank
T relativetostandardizedtestgeardimensions
(1),(2) trialsofinterpolation
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5 Application
5.1 General
Thisdocumentprovidesfoursamplecalculations:
— Sample1isaratingofaspiralbevelgearpairwithouthypoidoffsetaccordingtoMethodB1andMethodB2(seeAnnexA);
— Sample 2 is a rating of a hypoid gear set according to Method B1 and Method B2 (seeAnnexB);
— Sample 3 is a rating of a hypoid gear set according to Method B1 and Method B2 (seeAnnexC);
— Sample 4 is a rating of a hypoid gear set according to Method B1 and Method B2 (seeAnnexD).
5.2 Structure of calculation methods
Figure1 shows three boxes that represent the individual three parts of ISO10300. However,theseboxesaresubdividedintoaleftsidewhereinfluencefactorsaredeterminedonthebasisofmainlyoperationaldataaccordingtoMethodsA,BorC(seeISO10300‐1:2014,5.1)andarightsidewhereseparatecalculationproceduresareprovidedaccordingtoMethodB1andMethodB2whichareassumedtohavethesamelevelBbutdifferentapproaches.Thesetwomethodsrefertothe determination of virtual cylindrical gears in ISO10300‐1, the gear flank rating formulae inISO10300‐2andthegeartoothratingformulaeinISO10300‐3.
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a Onesetofformulaeforboth,bevelandhypoidgears.b Separatesetsofformulaeforbevelandforhypoidgears.
Figure 1 — Structure of calculation methods in ISO 10300 (all parts)
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Annex A (informative)
Sample 1: Rating of a spiral bevel gear pair without hypoid offset according to Method B1 and Method B2
A.1 Initial data
Sample1isforaspiralbevelgearpairwithouthypoidoffsetwhichusesMethod0accordingtoISO23509.
Table A.1 — Initial data for pitch cone parameters
Symbol Description Method 0 Method 1 Method 2 Method 3
Σ shaftangle 90° X X X
a hypoidoffset 0mm X X X
z1,2 numberofteeth 14/39 X X X
dm2 meanpitchdiameterofwheel — — X —
de2 outerpitchdiameterofwheel 176,893mm X — X
b2 wheelfacewidth 25,4mm X X X
βm1 meanspiralangleofpinion 35° X — —
βm2 meanspiralangleofwheel 35° — X X
rc0 cutterradius 114,3mm X X X
z0numberofbladegroups(onlyfacehobbing) — — X X
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Table A.2 — Input data for tooth profile parameters
Data type I Data type II
Symbol Description Symbol Description
αdD 20°
αdC 20°
fαlim 0
xhm1 — cham 0,24737
khap — kd 2,000
khfp — kc 0,125
xsmn —kt
Wm2
0,0915
—
jen 0,127mm
θa2 2,1342°
θf2 6,4934°
ρa01D,C 0,8mm/0,8mm
ρa02D,C 1,2mm/1,2mm
spr1D,C 0mm/0mm
spr2D,C 0mm/0mm
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