Gear tooth flank (pitting) strength — ISO 6336-1/-2

Maximum tangential force and drive torque for a spur/helical gear pair from permissible flank (contact) stress, per ISO 6336-1/-2.

✓ validated against legacyoriginal: /calculators/e2_6a.htm

Gear tooth flank (pitting) strength — ISO 6336-1/-2 — original diagram from /calculators/e2_6a.htm

Number of teeth, pinion, z₁Number of teeth, wheel, z₂Profile shift coefficient, pinion, x₁Profile shift coefficient, wheel, x₂Young's modulus, pinion, E₁GPaYoung's modulus, wheel, E₂GPaNormal module, mₙmmPressure angle, αdegFace width, bmmPermissible contact stress, σ_H,limMPaContact-stress factor, σ_HP/σ_H,lim (from kc.htm)Load factor, σ_H/σ_H0 = (K_A·K_v·K_Hβ·K_Hα)^½ (from kh.htm)

Maximum tangential force, F_t,max11.174492143164937 kN

Maximum drive torque, T_max,1598.3091233432939 Nm

Working pressure angle, α_w22.9 deg

Permissible flank stress, σ_HP1.104 GPa

Contact-ratio factor, Z_ε0.9164799956613532

Transverse contact ratio, ε_α1.4801932526576977

Elasticity factor, Z_E189.81170043756651 MPa^0.5

Zone factor, Z_H2.317342145732334

Centre distance, a307 mm

Gear ratio, u (≥1)4.733333333333333

Pitch diameter, pinion, d₁105 mm

Pitch diameter, wheel, d₂497 mm

Base circle diameter, pinion, d_b198.66772518252039 mm

Base circle diameter, wheel, d_b2467.02723253059645 mm

Working pitch diameter, pinion, d_w1107.08479914396102 mm

Working pitch diameter, wheel, d_w2506.8680492814155 mm

Method & references

ISO 6336-1/-2: Calculation of load capacity of spur and helical gears — flank (pitting) strength.

The computation is a literal port of the original client-side JavaScript from /calculators/e2_6a.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

Gear tooth flank (pitting) strength — ISO 6336-1/-2 — Engineering ABC