BSI PD ISO/TS 6336-22:2018
$189.07
Calculation of load capacity of spur and helical gears – Calculation of micropitting load capacity
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 50 |
This document describes a procedure for the calculation of the micropitting load capacity of cylindrical gears with external teeth. It has been developed on the basis of testing and observation of oil-lubricated gear transmissions with modules between 3 mm and 11 mm and pitch line velocities of 8 m/s to 60 m/s. However, the procedure is applicable to any gear pair where suitable reference data are available, providing the criteria specified below are satisfied.
The formulae specified are applicable for driving as well as for driven cylindrical gears with tooth profiles in line with the basic rack specified in ISO 53. They are also applicable for teeth conjugate to other basic racks where the virtual contact ratio (εαn) is less than 2,5. The results are in good agreement with other methods for normal working pressure angles up to 25°, reference helix angles up to 25° and in cases where pitch line velocity is higher than 2 m/s.
This document is not applicable for the assessment of types of gear tooth surface damage other than micropitting.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | Foreword |
| 8 | Introduction |
| 11 | 1 Scope 2 Normative references 3 Terms, definitions, symbols and units 3.1 Terms and definitions |
| 12 | 3.2 Symbols and units |
| 14 | 4 Micropitting |
| 15 | 5 Basic formulae 5.1 General 5.2 Safety factor against micropitting, Sλ |
| 16 | 5.3 Local specific lubricant film thickness, λGF,Y |
| 17 | 5.4 Permissible specific lubricant film thickness, λGFP |
| 18 | 5.5 Recommendation for the minimum safety factor against micropitting, Sλ,min |
| 19 | 6 Material parameter, GM 6.1 General |
| 20 | 6.2 Reduced modulus of elasticity, Er 6.3 Pressure viscocity coefficient at bulk temperature, αθM |
| 21 | 7 Local velocity parameter, UY 7.1 General 7.2 Sum of tangential velocities, vΣ,Y |
| 22 | 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 |
| 23 | 8 Local load parameter, WY 8.1 General 8.2 Local Hertzian contact stress, pdyn,Y,A, according to Method A |
| 24 | 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 |
| 25 | 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 |
| 26 | 9.3.3 Density of the lubricant at local contact temperature, ρθB,Y 10 Definition of contact point Y on the path of contact |
| 28 | 11 Load sharing factor, XY 11.1 General |
| 29 | 11.2 Spur gears with unmodified profiles 11.3 Spur gears with profile modification |
| 31 | 11.4 Local buttressing factor, Xbut,Y |
| 32 | 11.5 Helical gears with εβ ≤ 0,8 and unmodified profiles |
| 33 | 11.6 Helical gears with εβ ≤ 0,8 and profile modification 11.7 Helical gears with εβ ≥ 1,2 and unmodified profiles |
| 34 | 11.8 Helical gears with εβ ≥ 1,2 and profile modification |
| 35 | 11.9 Helical gears with 0,8 < εβ < 1,2 |
| 36 | 12 Local contact temperature, θB,Y 13 Local flash temperature, θfl,Y |
| 37 | 14 Bulk temperature, θM 14.1 General |
| 38 | 14.2 Mean coefficient of friction, µm |
| 39 | 14.3 Load losses factor, Hv |
| 40 | 14.4 Tip relief factor, XCa |
| 42 | 14.5 Lubricant factor, XS |
| 43 | 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 |
| 45 | Annex B (informative) Guideline for reference values of λGFP |
| 48 | Bibliography |
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BSI PD ISO/TS 6336-22:2018 – TC:2020 Edition
Tracked Changes. Calculation of load capacity of spur and helical gears – Calculation of micropitting…
