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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:

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

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

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

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

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

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

KB 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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