Determination of power losses in gear transmissions with rolling and sliding friction incorporated

A methodology is described for analysis of gear transmissions with allowance for the power losses due to both the rolling and sliding friction. The latter friction, incorporated in the traditional methods, does not by itself account for the wear of the teeth at contact sites adjoining the pitch point, where the rolling losses are paramount. The approach makes for improved accuracy (esp. in the vicinity of the pitch point) in predicting the losses and the wear already at the design stage.