This study investigates the effective parameters of scuffing failure in gears using the integral temperature method. For this aim, the mass temperature, integral temperature and scuffing safety factor are calculated for a given parameters. Then, integral temperatures are simulated based on various geometrical, operational and lubrication parameters. Obtained results are presented graphically. The obtained results show that increasing the module mn results in a decrease in the integral temperature ϑint. Similarly, increasing the pinion teeth number zp results in a decrease in the integral temperature ϑint. Increasing the module and tooth number positively affects the scuffing failure in gears. In contrast, increasing the transmitted torque MT1T results in an increase in the integral temperature ϑint. Similarly, increasing the pinion speed np increases the mass temperature ϑM, and increasing the lubricant (oil) ϑÖ temperature increases the integral temperature ϑint. Increasing the transmitted torque, lubricant temperature and the pinion speed negatively affects the scuffing failure in gears. Finally, increasing the nominal kinematic viscosity v40 decreases the integral temperature ϑint. Increasing the nominal kinematic viscosity positively affects the scuffing failure in gears. By considering the effective parameters of scuffing failure such as geometrical, operational and lubrication, one can design and manufacture the desired gears without scuffing failure.
[1] B. R. Höhn, and K. Michaelis, “Influence of oil temperature on gear failures”, Tribology International, vol. 37, pp. 103–109, 2004. https://doi.org/10.1016/S0301-679X(03)00047-1
[2] B. R. Höhn, K. Michaelis, and H.-Ph. Otto, “Influence of immersion depth of dip lubricated gears on power loss, bulk temperature and scuffing load carrying capacity”, Int. J. Mech. Mater Des., vol. 4, pp. 145–156, 2008. https://doi.org/10.1007/s10999-007-9045-z
[3] R. Martins, R. Amaro, and J. Seabra, “Influence of low friction coatings on the scuffing load capacity and efficiency of gears”, Tribology International, vol. 41, pp. 234–243, 2008. https://doi.org/10.1016/j.triboint.2007.05.008
[4] C. H. Wink, “Predicted Scuffing Risk to Spur and Helical Gears in Commercial Vehicle Transmissions”, Gear Technology, pp. 82–86, November/December 2012.
[5] M. McCormick, “The risk of scuffing, a non-fatigue-based failure mode, can be reduced via isotropic superfinishing”, Gear Solutions, September 2016. [Online]. Available: https://gearsolutions.com/departments/materials-matter-scuffing/. Accessed on: June 31, 2020.
[6] B. Schlecht, Maschinenelemente [Machine elements]. München, Germany: Pearson Studium, 2010. [in German].
[7] Tragfähigkeitsberechnung von Stirnrädern; Berechnung der Fresstragfähigkeit [Calculation of load capacity of cylindrical gears; calculation of scuffing load capacity], DIN 3990-4, 1987. [in German].
[8] Calculation of load capacity of spur and helical gears – Part 21: Calculation of scuffing load capacity (also applicable to bevel and hypoid gears) – Integral temperature method, ISO/TS 6336-21, 2017.
[9] Calculation of load capacity of spur and helical gears – Part 20: Calculation of scuffing load capacity (also applicable to bevel and hypoid gears) – Flash temperature method, ISO/TS 6336-20, 2017.