Effects of Surface Roughness on Thermo-Elastohydrodynamic Lubrication in Spur Gear
Abstract
This paper presents the effect of surface roughness to performance characteristics of transient thermal-elastohydrodynamic lubrication (TEHL) in line contact with Newtonian fluids. The time-dependent modified Reynolds equation, energy equation, elasticity equation, viscosity equation and density equation with initial conditions were solved numerically using finite different method, Newton-Raphson method and multigrid multilevel method for an involute spur gear to obtain the film pressure profiles, film thickness profiles and traction coefficient in the contact region. The results show that surface roughness has significant affected on film pressure, film thickness, film temperature and friction coefficient. The film thickness reaches its minimum at approach point. When the line of action increases film thickness increases. The film temperature and friction coefficient were suddenly increase when the transition from two pairs to one pair and vice versa are modeled as a step variation of load. The minimum friction coefficient and film temperature were occurrence at pitch point.
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