Effects of spin on traction characteristics

Abstract

The authors measured the traction at work on a rolling/sliding contact part where there was spin for two types of synthetic naphthene oil at average hertz surface pressures of 1.0∼1.6 GPa, oil temperatures of 40∼120°, peripheral velocities of 10∼20 m/s, and slide/roll ratios of 0-10%. They also calculated traction with spin by combining the calculated traction based on Johnson & Tevaarwerk's non-linear viscoelastic model with consideration of the distribution of slide speed within the ellipse of contact, and then compared this traction-with-spin calculation to the test results. The comparison showed that if one can precisely forecast traction without spin with a wide-ranging slide/roll ratio, then one can also forecast with much precision the traction with spin using the current method. Regarding the effects of load, oil temperature, and peripheral velocity, the study also showed that while load and peripheral velocity have a major effect when there is spin, oil temperature has a small effect.