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BS ISO 6336-2:2019 Calculation of load capacity of spur and helical gears - Calculation of surface durability (pitting), 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 Pitting damage and safety factors
- 5 Basic formulae
- 5.1 General
- 5.2 Safety factor for surface durability (against pitting), SH
- 5.3 Contact stress, σH
- 5.4 Permissible contact stress, σHP
- 5.4.1 General
- 5.4.2 Determination of permissible contact stress, σHP — Principles, assumptions and application
- 5.4.3 Permissible contact stress, σHP: Method B
- 5.4.4 Permissible contact stress for limited and long life: Method B
- 6 Zone factor, ZH, and contact factors, ZB and ZD
- 6.1 General
- 6.2 Zone factor, ZH
- 6.2.1 General
- 6.2.2 Graphical values
- 6.2.3 Determination by calculation
- 6.3 Contact factors, ZB and ZD, for εα ≤ 2
- 6.4 Contact factors, ZB and ZD, for εα > 2
- 7 Elasticity factor, ZE
- 8 Contact ratio factor, Zε
- 8.1 General
- 8.2 Determination of contact ratio factor, Zε
- 8.2.1 Graphical values
- 8.2.2 Determination by calculation
- 8.3 Calculation of transverse contact ratio, εα, and overlap ratio, εβ
- 8.3.1 Transverse contact ratio, εα
- 8.3.2 Overlap ratio, εβ
- 9 Helix angle factor, Zβ
- 10 Strength for contact stress
- 10.1 General
- 10.2 Allowable stress numbers (contact), σH lim: Method B
- 10.3 Allowable stress number values: Method BR
- 11 Life factor, ZNT (for flanks)
- 11.1 General
- 11.2 Life factor, ZNT: Method A
- 11.3 Life factor, ZNT: Method B
- 12 Influence of lubricant film, factors ZL, Zv and ZR
- 12.1 General
- 12.2 Influence of lubricant film: Method A
- 12.3 Influence of lubricant film, factors ZL, Zv and ZR: Method B
- 12.3.1 General
- 12.3.2 Factors ZL, Zv and ZR for reference stress
- 12.3.3 Factors ZL, Zv and ZR for static stress
- 13 Work hardening factor, ZW
- 13.1 General
- 13.2 Work hardening factor, ZW: Method A
- 13.3 Work hardening factor, ZW: Method B
- 13.3.1 Surface-hardened steel pinion with through-hardened steel gear
- 13.3.2 Through-hardened steel pinion with through-hardened steel gear
- 13.3.3 Surface-hardened steel pinion with ductile iron gear
- 14 Size factor, ZX
- Bibliography [Go to Page]