The gear tooth strength of high pressure angle gears is studied and compared with that of conventional pressure angle gears. The comparison is carried out regarding contact pressure, contact and bending stresses, and the loaded function of transmission errors. The gear geometric models are generated by the computerized simulation of the manufacturing process, and the corresponding finite element models consider a large number of contact positions along two cycles of meshing. In this way, the load sharing between different pairs of contacting teeth is considered, and the evolution of contact pressure, and contact and bending stresses all over the cycle of meshing are obtained. In general, high pressure angle spur and helical gears do not show a better behavior regarding contact pressure, contact stresses, and bending stresses than spur and helical gears with traditional pressure angle of 25 degrees. Based on the obtained results, high pressure angle gears are not expected to show better mechanical behavior in high power transmissions than gears with conventional designs. The results gathered from the finite element analysis are not in agreement with the improvement on the pitting and bending behavior of the gears that were anticipated by using analytical models as provided by international standards.
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