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BS ISO 6336-3:2019 Calculation of load capacity of spur and helical gears - Calculation of tooth bending strength, 2020
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviated terms
- 3.1 Terms and definitions
- 3.2 Symbols and abbreviated terms
- 4 Tooth breakage and safety factors
- 5 Basic formulae
- 5.1 General
- 5.2 Safety factor for bending strength (safety against tooth breakage), SF
- 5.3 Tooth root stress, σF
- 5.3.1 General
- 5.3.2 Method A
- 5.3.3 Method B
- 5.4 Permissible bending stress, σFP
- 5.4.1 General
- 5.4.2 Methods for determination of permissible bending stress, σFP — Principles, assumptions and application
- 5.4.3 Permissible bending stress, σFP: Method B
- 5.4.4 Permissible bending stress, σFP, for limited and long life: Method B
- 6 Form factor, YF
- 6.1 General
- 6.2 Calculation of the form factor, YF: Method B
- 6.2.1 General
- 6.2.2 Parameters of virtual gears
- 6.2.3 Tooth root normal chord, sFn, radius of root fillet, ρF, bending moment arm, hFe for external gears generated with a hob
- 6.2.4 Tooth root normal chord, sFn , radius of root fillet, ρF , bending moment arm, hFe for external gears generated with a shaper cutter2)
- 6.2.5 Tooth root normal chord, sFn, radius of root fillet, ρF, bending moment arm, hFe for internal gears generated with a shaper cutter2)
- 7 Stress correction factor, YS
- 7.1 Basic uses
- 7.2 Stress correction factor, YS: Method B
- 7.3 Stress correction factor for gears with notches in fillets
- 7.4 Stress correction factor, YST, relevant to the dimensions of the standard reference test gears
- 8 Helix angle factor, Yβ
- 8.1 General
- 8.2 Graphical value
- 8.3 Determination by calculation
- 9 Rim thickness factor, YB
- 9.1 General
- 9.2 Graphical values
- 9.3 Determination by calculation
- 9.3.1 External gears
- 9.3.2 Internal gears
- 10 Deep tooth factor, YDT
- 10.1 General
- 10.2 Graphical values
- 10.3 Determination by calculation
- 11 Reference stress for bending
- 11.1 General
- 11.2 Reference stress for Method A
- 11.3 Reference stress, with values σF lim and σFE for Method B
- 12 Life factor, YNT
- 12.1 General
- 12.2 Life factor, YNT: Method A
- 12.3 Life factor, YNT: Method B
- 12.3.1 General
- 12.3.2 Graphical values
- 12.3.3 Determination by calculation
- 13 Notch sensitivity factor, YδT, and relative notch sensitivity factor, Yδ rel T
- 13.1 Basic uses
- 13.2 Determination of the notch sensitivity factors
- 13.2.1 General
- 13.2.2 Method A
- 13.2.3 Method B
- 13.3 Relative notch sensitivity factor, Yδ rel T: Method B
- 13.3.1 Graphical values
- 13.3.2 Determination by calculation
- 14 Surface factors, YR, YRT, and relative surface factor, YR rel T
- 14.1 Influence of surface condition
- 14.2 Determination of surface factors and relative surface factors
- 14.2.1 General
- 14.2.2 Method A
- 14.2.3 Method B
- 14.3 Relative surface factor, YR rel T: Method B
- 14.3.1 Graphical values
- 14.3.2 Determination by calculation
- 15 Size factor, YX
- 15.1 General
- 15.2 Size factor, YX: Method A
- 15.3 Size factor, YX: Method B
- 15.3.1 General
- 15.3.2 Graphical values for reference stress and static stress
- 15.3.3 Determination by calculation
- Annex A (normative) Permissible bending stress, σFP, obtained from notched, flat or plain polished test pieces
- Annex B (informative) Guide values for mean stress influence factor, YM
- Annex C (informative) Derivations of determinant normal tooth load of spur gears
- Bibliography [Go to Page]