Abstract
When a plastic gear is used, there may be a problem as to which is better : intermeshing with plastic gears, or intermeshing with a plastic gear and a steel gear. In the former case, the wear is small since the coefficient of friction of the former is generally smaller than that of the latter. On the other hand, in the latter case, the temperature at the plastic gear becomes lower than in the former case, because the generated heat in the plastic gear conducts to the steel gear with good thermal conductivity, and it dissipates from the steel gear. This is advantageous for the plastic gear since it has a great defect in resistance to heat. In these ways, each intermeshing has its respective merits. In order to further study it in detail, we operated the plastic gear in both intermeshings and investigated the wear of the tooth, the change in tooth form, the temperature at the tooth, and the like.
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