Behavior of lubricant fluid film in gears under dynamic conditions

Abstract This paper presents a new method for modeling the fluid film lubrication in gears, considering the actual meshing conditions and gear dynamics. The model takes into account both the elastohydrodynamic lubrication (EHL) and the dynamic load between the mating tooth pair. The EHL film is described as a fully flooded elliptical contact. The present approach is validated by means of comparison with other methods found in the literature, in which dynamic effects were neglected. The effect of the gear dynamics on the fluid film is investigated. It is shown that pressure and film thickness are strongly modified by the dynamics of the gear pair. The dependence of the dynamic gear lubrication on dimensionless parameters is investigated: a new dimensionless inertia parameter is added to the standard Moes' parameters. These parameters are useful to describe the lubrication conditions in gear pairs.

[1]  R. Larsson.  Transient non-Newtonian elastohydrodynamic lubrication analysis of an involute spur gear , 1997 .

[2]  S. L. Harris,et al.  Dynamic Loads on the Teeth of Spur Gears , 1958 .

[3]  Puneet Tandon,et al.  Transient elastohydrodynamic lubrication analysis of an involute spur gear using couple-stress fluid , 2007 .

[4]  D. Dowson,et al.  Elasto-hydrodynamic lubrication : the fundamentals of roller and gear lubrication , 1966 .

[5]  Philippe Velex,et al.  A model for the simulation of the interactions between dynamic tooth loads and contact fatigue in spur gears , 2012 .

[6]  Ahmet Kahraman,et al.  A Transient Mixed Elastohydrodynamic Lubrication Model for Spur Gear Pairs , 2010 .

[7]  Henry Peredur Evans,et al.  Deterministic mixed lubrication modelling using roughness measurements in gear applications , 2009 .

[8]  H. Moes,et al.  Film thickness in elastohydrodynamically lubricated elliptic contacts , 1994 .

[9]  Homer Rahnejat,et al.  Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions , 2012 .

[10]  Sheng Li,et al.  Influence of dynamic behaviour on elastohydrodynamic lubrication of spur gears , 2011 .

[11]  Antonius Lubrecht,et al.  Film thickness prediction in elastohydrodynamically lubricated elliptical contacts , 2010 .

[12]  Cornelis H. Venner.  EHL Film Thickness Computations at Low Speeds: Risk of Artificial Trends as a Result of Poor Accuracy and Implications for Mixed Lubrication Modelling , 2005 .

[13]  A. Lubrecht,et al.  MultiLevel Methods in Lubrication , 2013 .

[14]  H. I. Waterman,et al.  The Viscosity-Temperature-Pressure Relationship of Lubricating Oils and Its Correlation With Chemical Constitution , 1963 .

[15]  J. Tong,et al.  Transient thermoelastohydrodynamic lubrication analysis of an involute spur gear , 2004 .

[16]  Ahmet Kahraman,et al.  Experiments on Nonlinear Dynamic Behavior of an Oscillator With Clearance and Periodically Time-Varying Parameters , 1997 .

[17]  Rajendra Singh,et al.  Non-linear dynamics of a spur gear pair , 1990 .