Effects of load intensity fluctuation on anti-seizure capacities of lubricating oils. 4th report Influence of contact width in heavy load intensity sector.

Abstract

As a basis for making clear the treatment of the dynamic load in the calculation of the scoring load capacity of a spur gear pair, the influence of the contact width in a heavy load intensity sector on the anti-seizure capacity of a gear base oil was examined by two-cylinder tests in which the load intensity was fluctuated during rotation from the viewpoints of load and temperature. Experiments were carried out at a high specific sliding. The contact width little affects the anti-seizure capacity as the sliding velocity is increased. The anti-seizure capacity under the fluctuating load intensity is not less than that under the constant load intensity. Particularly, the difference between both capacities increases as the sliding velocity is increased when the frictional surfaces are finished finely and the contact width is small. Independent of whether the load intensity is fluctuated or not, the seizure occurrence in the mixed lubrication state has an intimate relation with the outer surface bulk temperature rather than with the maximum contact surface temperature.