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PD ISO/TS 6336-22:2018 - TC Tracked Changes. Calculation of load capacity of spur and helical gears - Calculation of micropitting load capacity, 2020
- National foreword [Go to Page]
- Compliance with a British Standard cannot confer immunity from legal obligations.
- Amendments/corrigenda issued since publication
- Calculation of load capacity of spur and helical gears — [Go to Page]
- COPYRIGHT PROTECTED DOCUMENT
- Foreword
- Introduction [Go to Page]
- Table 1 — Overview of ISO 6336
- Calculation of micropitting load capacity of cylindrical spur and helical gears — [Go to Page]
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and units [Go to Page]
- 3.1 Terms and definitions
- 3.2 Symbols and units [Go to Page]
- Table 12 — Symbols and units
- 4 Definition of micropitting [Go to Page]
- 4 Micropitting
- 5 Basic formulae [Go to Page]
- 5.1 General
- 5.2 Safety factor against micropitting, Sλ
- 5.3 Local specific lubricant film thickness, λGF,Y [Go to Page]
- a) Method A
- b) Method B
- 5.4 Permissible specific lubricant film thickness, λGFP [Go to Page]
- a) Method A
- b) Method B
- 5.5 Recommendation for the minimum safety factor against micropitting, Sλ,min
- 6 Material parameter, GM [Go to Page]
- 6.1 General
- 6.16.2 Reduced modulus of elasticity, Er
- 6.26.3 Pressure viscocity coefficient at bulk temperature, αθM
- 7 VelocityLocal velocity parameter, UY [Go to Page]
- 7.1 General
- 7.17.2 Sum of tangential velocities, vΣ,Y
- 7.27.3 Dynamic viscosity at bulk temperature, ηθM [Go to Page]
- 7.3.1 General
- 7.2.17.3.2 Kinematic viscosity at bulk temperature, νθM
- 7.2.27.3.3 Density of the lubricant at bulk temperature, ρθM
- 8 LoadLocal load parameter, WY [Go to Page]
- 8.1 General
- 8.18.2 Local Hertzian contact stress, pdyn,Y,A, according to Method A
- 8.28.3 Local Hertzian contact stress, pdyn,Y,B, according to Method B [Go to Page]
- 8.3.1 General
- 8.2.18.3.2 Nominal Local nominal Hertzian contact stress, pH,Y,B
- 9 Sliding parameter, SGF,Y
- 9 Local sliding parameter, SGF,Y [Go to Page]
- 9.1 General
- The sliding parameter, SGF,Y [Go to Page]
- 9.19.2 Pressure viscosity coefficient at local contact temperature, αθB,Y
- 9.29.3 Dynamic viscosity at local contact temperature, ηθB,Y [Go to Page]
- 9.3.1 General
- 9.2.19.3.2 Kinematic viscosity at local contact temperature, νθB,Y
- 9.2.29.3.3 Density of the lubricant at local contact temperature, ρθB,Y
- 10 Definition of contact point Y on the path of contact [Go to Page]
- Y =
- Figure 1 — Definition of contact point Y on the line of action
- 11 Load sharing factor, XY [Go to Page]
- 11.1 General
- 11.111.2 Spur gears with unmodified profiles [Go to Page]
- Figure 2 — Load sharing factor for cylindrical spur gears with unmodified profiles and quality grade ≤ 7
- 11.211.3 Spur gears with profile modification [Go to Page]
- Figure 4 — Load sharing factor for cylindrical spur gears with adequate profile modification
- Figure 5 — Load sharing factor for cylindrical spur gears with adequate profile modification on the addendum of the driven gearwheel and/or the dedendum of the driving gearpinion
- Figure 6 — Load sharing factor for cylindrical spur gears with adequate profile modification on the addendum of the driving gearpinion and/or the dedendum of the driven gearwheel
- 11.4 Local buttressing factor, Xbut,Y [Go to Page]
- Figure 7 — Buttressing Local buttressing factor, Xbut,Y
- 11.411.5 Helical gears with εβ 1≤ 0,8 and unmodified profiles [Go to Page]
- Figure 8 — Load sharing factor forof cylindrical helical gears with εβ 1≤ 0,8 and unmodified profiles, including the buttressing effect
- 11.511.6 Helical gears with εβ 1≤ 0,8 and profile modification [Go to Page]
- Figure 9 — Load sharing factor for cylindrical helical gears with εβ 1≤ 0,8 and adequate profile modification
- 11.611.7 Helical gears with εβ ≥ 1,2 and unmodified profiles [Go to Page]
- Figure 12 — Load sharing factor for cylindrical helical gears with εβ ≥ 1,2 and unmodified profiles
- 11.711.8 Helical gears with εβ ≥ 1,2 and profile modification [Go to Page]
- Figure 13 — Load sharing factor for cylindrical helical gears with εβ ≥ 1,2 and adequate profile modification
- Figure 14 — Load sharing factor for cylindrical helical gears with εβ ≥ 1,2 and adequate profile modification on the addendum of the driven gearwheel and/or the dedendum of the driving gearpinion
- Figure 14 15 — Load sharing factor for cylindrical helical gears with εβ ≥ 1,2 and adequate profile modification on the addendum of the driven gearpinion and/or the dedendum of the driving gearwheel
- 11.9 Helical gears with 0,8 < εβ < 1,2
- 12 ContactLocal contact temperature, θB,Y
- 13 FlashLocal flash temperature, θfl,Y [Go to Page]
- Table 23 — Material properties of steel
- 14 Bulk temperature, θM [Go to Page]
- 14.1 General
- 14.114.2 Mean coefficient of friction, µm [Go to Page]
- Figure 16 — Helical load factor, KBγ
- Table 34 — Lubricant factor, XL
- 14.214.3 Load losses factor, Hv
- 14.314.4 Tip relief factor, XCa [Go to Page]
- Figure 17 — Tip relief factor, XCa, according to method A
- Figure 18 — Tip relief factor, XCa, according to Methodmethod B
- 14.4 Lubrication factor, XS
- 14.5 Lubricant factor, XS
- (informative) [Go to Page]
- Figure A.1 — Minimum permissible specific lubricant film thickness for mineral oils as function of nominal lubricant viscosity and failure load stage SKS of the FVA-FZG micropitting test
- Table A.1 — Material factor, WW
- Table A.1 — Material factor, WW
- Figure B.1 — Minimum permissible specific lubricant film thickness for mineral oils as function of nominal lubricant viscosity and lubricant micro-pitting performance (quality) at oil temperature θoil = 60 C
- Figure B.2 — Minimum permissible specific lubricant film thickness for mineral oils as function of nominal lubricant viscosity and lubricant micro-pitting performance (quality) at oil temperature θoil = 90 C
- Figure B.3 — Minimum permissible specific lubricant film thickness for mineral oils as function of nominal lubricant viscosity and lubricant micro-pitting performance (quality) at oil temperature θoil = 120 C
- Bibliography
- 30371491_New.pdf [Go to Page]
- National foreword
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and units [Go to Page]
- 3.1 Terms and definitions
- 3.2 Symbols and units
- 4 Micropitting
- 5 Basic formulae [Go to Page]
- 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 [Go to Page]
- 6.1 General
- 6.2 Reduced modulus of elasticity, Er
- 6.3 Pressure viscocity coefficient at bulk temperature, αθM
- 7 Local velocity parameter, UY [Go to Page]
- 7.1 General
- 7.2 Sum of tangential velocities, vΣ,Y
- 7.3 Dynamic viscosity at bulk temperature, ηθM [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- 8.3.1 General
- 8.3.2 Local nominal Hertzian contact stress, pH,Y,B
- 9 Local sliding parameter, SGF,Y [Go to Page]
- 9.1 General
- 9.2 Pressure viscosity coefficient at local contact temperature, αθB,Y
- 9.3 Dynamic viscosity at local contact temperature, ηθB,Y [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- 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]