Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
3.1 Terms and definitions
3.2 Symbols and units
4 Scuffing and wear
4.1 Occurrence of scuffing and wear
4.2 Transition diagram
4.3 Friction at incipient scuffing
5 Basic formulae
5.1 Contact temperature
5.2 Flash temperature formula
5.3 Transverse unit load
5.4 Distribution of overall bulk temperatures
5.5 Rough approximation of a bulk temperature
6 Coefficient of friction
6.1 Mean coefficient of friction, Method A
6.2 Mean coefficient of friction, Method B
6.3 Mean coefficient of friction, Method C
7 Parameter on the line of action
8 Approach factor
9 Load sharing factor
9.1 Buttressing factor
9.2 Spur gears with unmodified profiles
9.3 Spur gears with profile modification
9.4 Narrow helical gears with unmodified profiles
9.5 Narrow helical gears with profile modification
9.6 Wide helical gears with unmodified profiles
9.7 Wide helical gears with profile modification
9.8 Narrow bevel gears
9.9 Wide bevel gears
10 Scuffing temperature and safety
10.1 Scuffing temperature
10.2 Structural factor
10.3 Contact exposure time
10.4 Scuffing temperature in gear tests
10.5 Safety range
Annex A (informative) Flash temperature formula presentation
Annex B (informative) Optimal profile modification
Bibliography