The film thickness and the traction curves of four fully formulated wind turbine gear oils were measured on a ball-on-disc device. All oils have the same viscosity grade (ISO VG 320) and different formulations: ester, mineral, PAO and mineral+PAMA.
Film thickness and traction coefficient results will be presented. The film thickness measurements were compared with predictions using film thickness equations from the literature.
Keywords: Wind turbine gear oils, Film thickness, Coefficient of friction, Stribeck curve
DOI Link: https://doi.org/10.1016/j.triboint.2015.01.014