Plastic gears have various merits such as silent running, selflubrication, and so on, but they also have some demerits such as less load-carrying capacity and unsteady life time. In regard to our sixty two experiments, most of the failure of plastic fears were breakages from near pitch points. On basis of these results, new design equations for bending strength, described by the bending stress at the pitch point, are proposed. In the equations, some coefficients; tooth thickness coefficient, load increasing factor, stress correction factor, etc., are introduced to realize economically higher load capacity by making the best use of the characteristics of plastic materials.
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