BSI PD ISO/TS 6336-22:2018 – TC:2020 Edition
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Tracked Changes. Calculation of load capacity of spur and helical gears – Calculation of micropitting load capacity
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 108 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | National foreword Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication |
| 4 | Calculation of load capacity of spur and helical gears — |
| 5 | COPYRIGHT PROTECTED DOCUMENT |
| 8 | Foreword |
| 9 | Introduction |
| 10 | Table 1 — Overview of ISO 6336 |
| 11 | Calculation of micropitting load capacity of cylindrical spur and helical gears — 1 Scope 2 Normative references 3 Terms, definitions, symbols and units 3.1 Terms and definitions |
| 12 | 3.2 Symbols and units Table 12 — Symbols and units |
| 15 | 4 Definition of micropitting 4 Micropitting 5 Basic formulae 5.1 General |
| 16 | 5.2 Safety factor against micropitting, Sλ 5.3 Local specific lubricant film thickness, λGF,Y |
| 17 | a) Method A b) Method B 5.4 Permissible specific lubricant film thickness, λGFP a) Method A |
| 18 | b) Method B 5.5 Recommendation for the minimum safety factor against micropitting, Sλ,min |
| 20 | 6 Material parameter, GM 6.1 General 6.16.2 Reduced modulus of elasticity, Er 6.26.3 Pressure viscocity coefficient at bulk temperature, αθM |
| 21 | 7 VelocityLocal velocity parameter, UY 7.1 General 7.17.2 Sum of tangential velocities, vΣ,Y |
| 22 | 7.27.3 Dynamic viscosity at bulk temperature, ηθM 7.3.1 General 7.2.17.3.2 Kinematic viscosity at bulk temperature, νθM |
| 23 | 7.2.27.3.3 Density of the lubricant at bulk temperature, ρθM 8 LoadLocal load parameter, WY 8.1 General 8.18.2 Local Hertzian contact stress, pdyn,Y,A, according to Method A |
| 24 | 8.28.3 Local Hertzian contact stress, pdyn,Y,B, according to Method B 8.3.1 General 8.2.18.3.2 Nominal Local nominal Hertzian contact stress, pH,Y,B |
| 25 | 9 Sliding parameter, SGF,Y 9 Local sliding parameter, SGF,Y 9.1 General The sliding parameter, SGF,Y 9.19.2 Pressure viscosity coefficient at local contact temperature, αθB,Y 9.29.3 Dynamic viscosity at local contact temperature, ηθB,Y 9.3.1 General |
| 26 | 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 |
| 27 | 10 Definition of contact point Y on the path of contact Y = |
| 28 | Figure 1 — Definition of contact point Y on the line of action |
| 30 | 11 Load sharing factor, XY 11.1 General 11.111.2 Spur gears with unmodified profiles Figure 2 — Load sharing factor for cylindrical spur gears with unmodified profiles and quality grade ≤ 7 |
| 32 | 11.211.3 Spur gears with profile modification Figure 4 — Load sharing factor for cylindrical spur gears with adequate profile modification |
| 33 | 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 |
| 34 | 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 |
| 35 | 11.4 Local buttressing factor, Xbut,Y Figure 7 — Buttressing Local buttressing factor, Xbut,Y |
| 36 | 11.411.5 Helical gears with εβ 1≤ 0,8 and unmodified profiles |
| 37 | 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 Figure 9 — Load sharing factor for cylindrical helical gears with εβ 1≤ 0,8 and adequate profile modification |
| 38 | 11.611.7 Helical gears with εβ ≥ 1,2 and unmodified profiles 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 |
| 39 | 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 |
| 40 | 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 |
| 41 | 11.9 Helical gears with 0,8 < εβ < 1,2 12 ContactLocal contact temperature, θB,Y 13 FlashLocal flash temperature, θfl,Y |
| 42 | Table 23 — Material properties of steel 14 Bulk temperature, θM 14.1 General |
| 44 | 14.114.2 Mean coefficient of friction, µm |
| 46 | Figure 16 — Helical load factor, KBγ Table 34 — Lubricant factor, XL |
| 47 | 14.214.3 Load losses factor, Hv 14.314.4 Tip relief factor, XCa |
| 48 | Figure 17 — Tip relief factor, XCa, according to method A |
| 50 | Figure 18 — Tip relief factor, XCa, according to Methodmethod B |
| 51 | 14.4 Lubrication factor, XS 14.5 Lubricant factor, XS |
| 52 | (informative) 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 |
| 53 | Table A.1 — Material factor, WW Table A.1 — Material factor, WW |
| 55 | 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 |
| 56 | 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 |
| 57 | Bibliography |
| 60 | National foreword |
| 65 | Foreword |
| 66 | Introduction |
| 69 | 1 Scope 2 Normative references 3 Terms, definitions, symbols and units 3.1 Terms and definitions |
| 70 | 3.2 Symbols and units |
| 72 | 4 Micropitting |
| 73 | 5 Basic formulae 5.1 General 5.2 Safety factor against micropitting, Sλ |
| 74 | 5.3 Local specific lubricant film thickness, λGF,Y |
| 75 | 5.4 Permissible specific lubricant film thickness, λGFP |
| 76 | 5.5 Recommendation for the minimum safety factor against micropitting, Sλ,min |
| 77 | 6 Material parameter, GM 6.1 General |
| 78 | 6.2 Reduced modulus of elasticity, Er 6.3 Pressure viscocity coefficient at bulk temperature, αθM |
| 79 | 7 Local velocity parameter, UY 7.1 General 7.2 Sum of tangential velocities, vΣ,Y |
| 80 | 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 |
| 81 | 8 Local load parameter, WY 8.1 General 8.2 Local Hertzian contact stress, pdyn,Y,A, according to Method A |
| 82 | 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 |
| 83 | 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 |
| 84 | 9.3.3 Density of the lubricant at local contact temperature, ρθB,Y 10 Definition of contact point Y on the path of contact |
| 86 | 11 Load sharing factor, XY 11.1 General |
| 87 | 11.2 Spur gears with unmodified profiles 11.3 Spur gears with profile modification |
| 89 | 11.4 Local buttressing factor, Xbut,Y |
| 90 | 11.5 Helical gears with εβ ≤ 0,8 and unmodified profiles |
| 91 | 11.6 Helical gears with εβ ≤ 0,8 and profile modification 11.7 Helical gears with εβ ≥ 1,2 and unmodified profiles |
| 92 | 11.8 Helical gears with εβ ≥ 1,2 and profile modification |
| 93 | 11.9 Helical gears with 0,8 < εβ < 1,2 |
| 94 | 12 Local contact temperature, θB,Y 13 Local flash temperature, θfl,Y |
| 95 | 14 Bulk temperature, θM 14.1 General |
| 96 | 14.2 Mean coefficient of friction, µm |
| 97 | 14.3 Load losses factor, Hv |
| 98 | 14.4 Tip relief factor, XCa |
| 100 | 14.5 Lubricant factor, XS |
| 101 | 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 |
| 103 | Annex B (informative) Guideline for reference values of λGFP |
| 106 | Bibliography |
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BSI PD ISO/TS 6336-22:2018
Calculation of load capacity of spur and helical gears – Calculation of micropitting load capacity…
