Performance of Spur Gears Considering Surface Roughness and Shear Thinning Lubricant
- 1 April 2008
- journal article
- Published by ASME International in Journal of Tribology
- Vol. 130 (2), 021503
- https://doi.org/10.1115/1.2805431
Abstract
A model is developed for predicting the performance of spur gears with provision for surface roughness. For each point along the line of action, the contact of pinion and gear is replaced by that of two cylinders. The radii of cylinders, transmitted load, and contact stress are calculated, and lubricant film thickness is obtained using the load-sharing concept of Johnson et al. (1972, “A Simple Theory of Asperity Contact in Elastohydrodynamic Lubrication,” Wear, 19, pp. 91–108) To validate the analysis, the predicted film thickness and the friction coefficient are compared to published theoretical and experimental data. The model is capable of predicting the performance of gears with non-Newtonian lubricants—such as that of shear thinning lubricants—often used in gears. For this purpose, a correction factor for shear thinning film thickness introduced by Bair (2005, “Shear Thinning Correction for Rolling/Sliding Electrohydrodynamic Film Thickness,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 219, pp. 1–6) has been employed. The results of a series of simulations presenting the effect of surface roughness on the friction coefficient are presented and discussed. The results help to establish the lubrication regime along the line of action of spur gears.Keywords
This publication has 16 references indexed in Scilit:
- Applied Tribology: Bearing Design and LubricationPublished by Wiley ,2017
- Roughness Amplitude Reduction Under Non-Newtonian EHD Lubrication ConditionsJournal of Tribology, 2006
- Reynolds Equations for Common Generalized Newtonian Models and an Approximate Reynolds-Carreau EquationProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2006
- Simulation of mild wear in spur gearsWear, 1997
- A deterministic model for line-contact partial elastohydrodynamic lubricationTribology International, 1995
- Application of Transient Elastohydrodynamic Lubrication Analysis for Gear TransmissionsTribology Transactions, 1995
- A Numerical Solution to the Dynamic Load, Film Thickness, and Surface Temperatures in Spur Gears, Part I: AnalysisJournal of Mechanical Design, 1981
- An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic LubricationJournal of Lubrication Technology, 1978
- A simple theory of asperity contact in elastohydro-dynamic lubricationWear, 1972
- Paper 3: Film Thicknesses in Elastohydrodynamic Lubrication by Silicone FluidsProceedings of the Institution of Mechanical Engineers, Conference Proceedings, 1965