Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
4 Pitting damage and safety factors
5 Basic formulae
5.1 General
5.2 Safety factor for surface durability (against
pitting), S[H]
5.3 Contact stress, sigma[H]
5.4 Permissible contact stress, sigma[HP]
6 Zone factor, Z[H], and single pair tooth contact factors,
Z[B] and Z[D]
6.1 Zone factor, Z[H]
6.2 Single pair tooth contact factors, Z[B] and Z[D],
for epsilon[alpha] <= 2
6.3 Single pair tooth contact factors, Z[B] and Z[D],
for epsilon[alpha] > 2
7 Elasticity factor, Z[E]
8 Contact ratio factor, Z[epsilon]
8.1 Determination of contact ratio factor, Z[epsilon]
8.2 Calculation of transverse contact ratio,
Sigma[alpha], and overlap ratio, epsilon[beta]
9 Helix angle factor, Z[beta]
10 Strength for contact stress
10.1 Allowable stress numbers (contact), sigma[H lim], for
Method B
10.2 Allowable stress number values for Method B[R]
11 Life factor, Z[NT] (for flanks)
11.1 Life factor Z[NT]: Method A
11.2 Life factor Z[NT]: Method B
12 Influence of lubricant film, factors Z[L], Z[v] and Z[R]
12.1 General
12.2 Influence of lubricant film: Method A
12.3 Influence of lubricant film, factors Z[L], Z[v] and
Z[R]: Method B
13 Work hardening factor, Z[W]
13.1 Work hardening factor, Z[W]: Method A
13.2 Work hardening factor, Z[W]: Method B
14 Size factor, Z[X]
Annex A (informative) Start of involute
Bibliography