Elastohydrodynamic Lubrication of Spur Gears: It’s Effect on Gear Strength

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Tag Eldin Mohamed Osman, Ali
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An analysis and computer programs are developed to predict the spur gear tooth strength and lubrication performance for different operating conditions and gear geometry. The analyses of the gear strength are obtained by a relatively new numerical technique called Boundary Element Method. The method proved to be a simple, powerful and versatile technique in solving a wide range of engineering problems. In order to investigate the effect of the existence of lubricant film between two mating teeth on gear tooth strength, a full analysis for the lubrication performance including the effect of speed, load and material properties are developed by coupling the elasticity equation with the Reynolds lubrication differential equation considering the variation of viscosity and density with pressure and the exact gear geometry along the path of contact. The analysis show that pressure distribution created between two 1ubricated gears results in a substantial reduction in the gear tooth stresses when compared with the same load capacity applied at a point. Results obtained numerically show similar patterns to those obtained experimentally using photo elastic technique.
Elastohydrodynamic ,Lubrication,Spur Gears , Gear Strength