Abstract
The key parameters which caused the scoring failure of helical gears are operating load and speed. In this study, the simulations using geometric meshing theory were carried out to investigate the effect of load and speed of warship transmission helical gear system on thermal elasto-hydrodynamic lubrication. The numerical algorithm for the analysis of three-dimensional thermal elasto-hydrodynamic lubrication used in this work has advantage that the film pressure and distributions can be calculated from Reynolds equation for all mixed lubrication regions without any specific boundary condition for the edge of solid contact region. Oil film pressure, film thickness as well as film temperature under different load and speed conditions were obtained and compared. In addition, experimental tests were conducted to determine gear surface temperature under different load and speed conditions. This work provided a guidance to understand the load- and speed-dependent thermal elasto-hydrodynamic lubrication.
Highlights
The wear caused by insufficient lubricant is the most general issue of endurance life troubles
A detachable lever is attached on the torque coupling, and static loads are applied on the lever to produce dynamic load
The design of test bed is ideal for our research; it can change helical gears’ load and speed to investigate their effects on elasto-hydrodynamic lubrication (EHL)
Summary
The wear caused by insufficient lubricant is the most general issue of endurance life troubles. The lubrication is mandatory to improve the endurance life of gears. As the primary failure modes, gear scoring is one type of adhesive wear caused by oil film breakdown. It usually occurs in a short time and could sometimes damage gear surface.[1,2,3] To date, a great deal of studies[4] have been done to study teeth cracking and pitting due to scoring. Some studies[6] have been conducted on effect of profile modification of gears on scuffing, while other studies[7] have been focused on presenting calculation method for gear scoring
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