The key parameters which caused the scoring failure of helical gears are operating load and speed. In this study, the\nsimulations using geometric meshing theory were carried out to investigate the effect of load and speed of warship\ntransmission helical gear system on thermal elasto-hydrodynamic lubrication. The numerical algorithm for the analysis of\nthree-dimensional thermal elasto-hydrodynamic lubrication used in this work has advantage that the film pressure and\ndistributions can be calculated from Reynolds equation for all mixed lubrication regions without any specific boundary\ncondition for the edge of solid contact region. Oil film pressure, film thickness as well as film temperature under different\nload and speed conditions were obtained and compared. In addition, experimental tests were conducted to determine\ngear surface temperature under different load and speed conditions. This work provided a guidance to understand\nthe load- and speed-dependent thermal elasto-hydrodynamic lubrication.
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