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I have searched for information, but I'm looking for an explanation on the difference between a safety factor and a service factor for gearing, and how you would use the latter of the two in calculation (i.e. does it work like a safety factor?). Does anyone have any references that explain it well? I have the AGMA code in hand along with several reference texts they are all pretty sparse on this topic.

From what I understand, a safety factor is used to compensate for uncertainties under the intended design conditions, whereas a service factor is used to compensate for uncertainties in the operational environment. Further, the service factor is broken into two components of durability (fatigue) and strength (bending). Is my intuition close to the mark or is it misguided?

The reason I am asking these things is because I'm trying to calculate the stresses through the mesh of a gear box for a transient event, on the order of fractions of a second, where the torque spikes to approximately 86% of the rated strength service factor of the gear box. i'm trying to figure out if the stresses on the teeth will exceed the yield strength of the material for this one event, so i am not interested in fatigue. so far i have used the lewis bending model, lewis model with dynamic effect, and the agma equation for bending stress to obtain comparable estimates for the stress. i now need to find the upper limit.

any help is greatly appreciated. thanks

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# Gear strength service factor / transient load calc

Can you offer guidance or do you also need help?

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