![]() (3) Determination of Various Coefficients The bending strength at the root, σF (kgf/mm2), is calculated from Equation (10.33). The tangential force at the central pitch circle, Ftmlim(kgf) is obtained from Equation (10.32). The bending stress at the root, σF, which is derived from Ftm should not exceed the allowable bending stress σFlim. ![]() The tangential force, Ftm, acting at the central pitch circle should be less than the allowable tangential force, Ftmlim, which is based upon the allowable bending stress at the root σFlim. ![]() Where vm:Tangential speed at the central pitch circle (m/s) Their basic relationships are expressed in the following Equations. In calculating strength, transmitted tangential force at the pitch circle, Ftm (kgf), power, P (kW), and torque, T (kgf・m), are the design criteria. Rotational speed /n / 3600rpm or less (1) Conversion Formulas Pitch diameter / d0 / 1600mm or less (for straight bevel gears), 1000mm or less (for spiral bevel gears) This information is valid for bevel gears which are used for power transmission in general industrial machines.
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