AGMA Spur Gear Bending Stress Excel Spreadsheet Calculator

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AGMA Spur Gear Bending Stress Equation and Spread Sheet (1999)

The AGMA* spur gear bending method can be viewed as a detailed refinement of the Lewis method.

Eqn. 14.58

Where:

Y_j is the Lewis form factor corrected for several geometry factors, including stress concentration effects.Fig 14.30

K_a is the Application factor (1 to 2.75) that accounts for pulsation and shock in the driver and load. Table 14.8

K_s is the Size factor (1 to 1.4) which penalizes very large or wide teeth.

K_m is the Load Distribution factor (1 to 2) that is a function of face width. paragraph 14.11.3

K_V is the Dynamic factor (1 to 1.8), essentially a tailored Barth velocity factor that considers gear quality. Fig. 14.34

K_i is the Idler factor (1 or 1.42), accounting for reversed bending in idlers.

K_B is the Rim Thickness factor which penalizes for the rim flexibility of non-solid gears. Eqn. 14.67

* American Gear Manufacturers Association

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