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It is well known by now that pressure, temperature, and film shape definitely play important roles in the failure of heavily loaded non-conformal contacts, such as rolling element bearings, gears, traction drives, or cams and tappets. Furthermore, the effect of heat generated due to the shearing of the high-pressure lubricant is no longer negligible under sliding conditions, as the heat changes the characteristics of the oil flow because of a decrease in viscosity. Therefore, the thermal effect on the film thickness and traction is significant in elastohydrodynamic lubricated contacts. So an accurate estimate of the temperature distribution in the contact zone at various operational parameters is necessary. Since (Sternlicht et al., 1961) started to consider the thermal effects of line contact in the EHL under rolling/sliding conditions, the inclusion of thermal effects in EHL has been an important subject of research in the field of tribology. Many numerical solutions considering the thermal effects on EHL have been presented, for instance, by (Ghosh & Hamrock, 1985), (Salehizadeh & Saka, 1991), and (Lee & Hsu, 1993); and for thermal point contact problems by (Zhu & Wen, 1984), (Kim & Sadeghi, 1992), and (Lee & Hsu, 1995). With respect to measuring the temperature increase in EHL contacts, (Cheng & Orcutt, 1965), (Safa et al., 1982), and (Kannel et al., 1978) have measured the temperature increase in a sliding surface using a thin film gauge deposited on a disc. (Turchina et al., 1974) and (Ausherman et al., 1976) employed an improved infrared technique to measure the temperature distribution of the oil film and surface. They demonstrated that the temperature was maximum at zones with minimum film thickness in the contact side lobes. Recently, (Yagi et al., 1966) described the mechanism of variations of EHL oil film under high slip ratio conditions. The oil film thickness between a ball surface and a glass disk was measured using optical interferometry, and the temperature of both the surfaces and of the oil film average across it were measured using an infrared emission technique. They demonstrated that the shape of the oil film can be varied by viscosity wedge action which related to pressure and temperature. During the last decade, optical interferometry has been found to be the most widely used and successful method in measuring oil film. Several studies of an EHL film were carried

Inverse Approach for Calculating Temperature in Thermal Elasto-Hydrodynamic Lubrication of Line Contacts