Oil Supply in EHL Performance for the Logarithmic Profile Roller

Because the factors of oil supply are not taken into account in current crowning design, the influence of oil supply on the elastohydrodynamic lubrication characteristics of logarithmic roller was studied. It was concluded that in the middle of the roller in the axis directions, the lubrication characteristics of logarithmic roller were similar to those of infinite line contact under elastohydrodynamic lubrication. At the axial end, when the oil supply was low, the film thickness was low and the axial oil film neck shrinkage was not obvious. With the increase of oil supply, the film thickness increased gradually from the middle to the end along the axis direction of the roller, and the axial oil film neck shrinkage was gradually established until the end closure effect of the film thickness took into effect,. Therefore, full oil lubrication was reached. The edge effect of pressure tended to be significant in the process from oil starvation to oil enrichment. Therefore, the results of crowning design under fully oil conditions can not be directly applied to oil-starvation conditions, and the crowning value needed in oil-starvation conditions was less than that of fully oil lubrication.