BS ISO 6336-3:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated
   terms
4 Tooth breakage and safety factors
5 Basic formulae
   5.1 Safety factor for bending strength
        (safety against tooth breakage), S[F]
   5.2 Tooth root stress, sigma[F]
   5.3 Permissible bending stress, sigma[FP]
6 Form factor, Y[F]
   6.1 General
   6.2 Calculation of the form factor, Y[F]: Method B
   6.3 Derivations of determinant normal tooth load
        for spur gears
7 Stress correction factor, Y[S]
   7.1 Basic uses
   7.2 Stress correction factor, Y[S]: Method B
   7.3 Stress correction factor for gears with notches
        in fillets
   7.4 Stress correction factor, Y[ST], relevant to the
        dimensions of the standard reference test gears
8 Helix angle factor, Y[beta]
   8.1 Graphical value
   8.2 Determination by calculation
9 Rim thickness factor, Y[B]
   9.1 Graphical values
   9.2 Determination by calculation
10 Deep tooth factor, Y[DT]
   10.1 Graphical values
   10.2 Determination by calculation
11 Reference stress for bending
   11.1 Reference stress for Method A
   11.2 Reference stress, with values sigma[F lim] and
        sigma[FE] for Method B
12 Life factor, Y[NT]
   12.1 Life factor, Y[NT]: Method A
   12.2 Life factor, Y[NT]: Method B
13 Sensitivity factor, Y[delta T], and relative notch
   sensitivity factor, Y[delta rel T]
   13.1 Basic uses
   13.2 Determination of the sensitivity factors
   13.3 Relative notch sensitivity factor, Y[delta rel T]:
        Method B
14 Surface factors, Y[R], Y[RT], and relative surface
   factor, Y[R rel T]
   14.1 Influence of surface condition
   14.2 Determination of surface factors and relative
        surface factors
   14.3 Relative surface factor, Y[R rel T]: Method B
15 Size factor, Y[X]
   15.1 Size factor, Y[X]: Method A
   15.2 Size factor, Y[X]: Method B
Annex A (normative) Permissible bending stress, sigma[FP],
                    obtained from notched, flat or plain
                    polished test pieces
Annex B (informative) Guide values for mean stress influence
                      factor, Y[M]
Bibliography

Describes the fundamental formulae for use in tooth bending stress calculations for involute external or internal spur and helical gears with a rim thickness s[R] > 0,5 h[t] for external gears and s[R] > 1,75 m[n] for internal gears.