The paper deals primarily with two theories which, in the last decade, have been increasingly incorporated in the theory of gear lubrication and enable both gear designers and lubricant technologists to approach the various tribological problems in gears in a more rational manner. These theories are as follows: (1) A theory predicting the temperature required for judging the risk of scuffing, i.e. the conjunction temperature occurring in the area of closest approach between the meshing tooth faces. This theory combines the classical theory of flash temperature with a thermal network theory, the latter being novel and aiming at the prediction of the bulk temperature component of the conjunction temperature. (2) The theory of elastohydrodynamic lubrication which has proved increasingly helpful in predicting both the coefficients of tooth friction and the occurrence and severity of various kinds of tooth wear.
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