Abstract
An approximate thermal solution was derived for the traction curve of a low viscosity oil film such as an automotive lubricant under the EHL conditions. First, the effective viscosity-pressure coefficient and the effective pressure derived from the mean viscosity over the Hertzian contact were obtained by considering the distribution of the viscosity over the Hertzian contact. Then, the Eyring model was applied to the shear behavior of a lubricant film, the mean shear stress was given by the sum of the shear stress in the Newtonian region and that in the non-Newtonian region in the contact, in which dissipation of shear heating was considered. Finally, the thermal theory was verified by comparing the calculated results with the experimental results determined with a disk-on-roller type EHL tester. It was found that the approximate thermal solution described well the experimental results in the high slide/roll ratio with a sufficient accuracy.
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