Calculation procedures for the design of nitrided gear teeth commonly use a basic allowable stress which is constant for a particular core tonnage and case depth. The purpose of this paper is to determine the distribution of stresses in nitrided rolling elements, including gear teeth, and to illustrate the effects on the theoretical basic allowable stress of the size and geometry of the gears. Two criteria of fatigue failure are compared and the predicted values are compared with test results.
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