Abstract
The strength of plastic gear greatly varies with temperature; that is, the strength increases as the temperature decreases. Therefore, the lifetime of a plastic gear can be increased by reducing the meshing-teeth temperature. Therefore, grease is mainly used to reduce the amount of frictional heat generated by plastic gears. In this study, we investigated the effect of grease properties on the load-carrying characteristics of crossed helical gears. Specifically, we investigated greases with different additive contents. As a result, we confirmed the effectiveness of the additive. However, the effect of increasing the content of the additive seems to be limited. It was also confirmed that there is a good correlation between the amount of increase in meshing-teeth temperature and the power transmission efficiency. Moreover, as the content of additives increased, the rate of increase in meshing-teeth temperature tended to increase. The detailed reason for this is not clear. Therefore, it is necessary to increase the number of tests and consider then in more detail.
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