60-5406: Crowned / Straight Tooth - Gear Stress (Standalone)     

The ideal uniform load distribution along gear teeth is seldom obtained due to many factors, including dimensional errors and elasticity in the gear teeth themselves, and also in supporting elements such as shafts, bearings, and housings. The usual design procedure for assessing the compressive stress on teeth with no longitudinal (lead) modification is to use the Hertz equations for parallel cylinders and then to apply a multiplier based on the face mismatch to obtain the actual compressive stress in the misaligned position. One widely used method of relieving the load on the tooth ends due to mismatch is “lead crowning.” When the teeth are crowned, it is necessary to use the Hertz equations for elliptical contacts instead of the parallel cylinder equations. This program incorporates both conditions and uses the parallel cylinder equations for straight teeth and the elliptical contact equations for teeth with crown.
 
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