BS ISO 6336-2:2006

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

Defines the fundamental formula for use in the determination of the surface load capacity of cylindrical gears with involute external or internal teeth. It includes formula for all influences on surface durability for which quantitative assessments can be made. Applies primarily to oil-lubricated transmissions, but can also be used to obtain approximate values for (slow-running) grease-lubricated transmissions, as long as sufficient lubricant is present in the mesh at all times.