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ISO/TS 6336-22:2018 Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity >
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ISO/TS 6336-22:2018 Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity, 2018
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and units
- 3.1 Terms and definitions
- 3.2 Symbols and units
- 4 Micropitting
- 5 Basic formulae
- 5.1 General
- 5.2 Safety factor against micropitting, Sλ
- 5.3 Local specific lubricant film thickness, λGF,Y
- 5.4 Permissible specific lubricant film thickness, λGFP
- 5.5 Recommendation for the minimum safety factor against micropitting, Sλ,min
- 6 Material parameter, GM
- 6.1 General
- 6.2 Reduced modulus of elasticity, Er
- 6.3 Pressure viscocity coefficient at bulk temperature, αθM
- 7 Local velocity parameter, UY
- 7.1 General
- 7.2 Sum of tangential velocities, vΣ,Y
- 7.3 Dynamic viscosity at bulk temperature, ηθM
- 7.3.1 General
- 7.3.2 Kinematic viscosity at bulk temperature, νθM
- 7.3.3 Density of the lubricant at bulk temperature, ρθM
- 8 Local load parameter, WY
- 8.1 General
- 8.2 Local Hertzian contact stress, pdyn,Y,A, according to Method A
- 8.3 Local Hertzian contact stress, pdyn,Y,B, according to Method B
- 8.3.1 General
- 8.3.2 Local nominal Hertzian contact stress, pH,Y,B
- 9 Local sliding parameter, SGF,Y
- 9.1 General
- 9.2 Pressure viscosity coefficient at local contact temperature, αθB,Y
- 9.3 Dynamic viscosity at local contact temperature, ηθB,Y
- 9.3.1 General
- 9.3.2 Kinematic viscosity at local contact temperature, νθB,Y
- 9.3.3 Density of the lubricant at local contact temperature, ρθB,Y
- 10 Definition of contact point Y on the path of contact
- 11 Load sharing factor, XY
- 11.1 General
- 11.2 Spur gears with unmodified profiles
- 11.3 Spur gears with profile modification
- 11.4 Local buttressing factor, Xbut,Y
- 11.5 Helical gears with εβ ≤ 0,8 and unmodified profiles
- 11.6 Helical gears with εβ ≤ 0,8 and profile modification
- 11.7 Helical gears with εβ ≥ 1,2 and unmodified profiles
- 11.8 Helical gears with εβ ≥ 1,2 and profile modification
- 11.9 Helical gears with 0,8 < εβ < 1,2
- 12 Local contact temperature, θB,Y
- 13 Local flash temperature, θfl,Y
- 14 Bulk temperature, θM
- 14.1 General
- 14.2 Mean coefficient of friction, µm
- 14.3 Load losses factor, Hv
- 14.4 Tip relief factor, XCa
- 14.5 Lubricant factor, XS
- Annex A (informative) Calculation of the permissible specific lubricant film thickness for oils with a micropitting test result according to FVA-Information Sheet 54/7
- Annex B (informative) Guideline for reference values of λGFP
- Bibliography [Go to Page]