The Effects of Solid-liquid Two Phase Flow on Thermal Elastohydrodynamic Lubrication of Spur Gears in Running-in Period

Elastohydrodynamic model of contact area containing solid particles was established, the Reynolds equation was revised. Considering influence of drag force that lubricant forces on solid particles and particle velocity's variation with the change of particle motion position and effects of particle spin and thermal effect, influences of the change of particle motion position and particle spin on film pressure and film thickness and temperature were analyzed. Finally, the numerical calculation results were validated. Results show that particle velocity varied with the change of particle motion position, particle velocity in contact region near the center changed slightly. When particle was close to contact region center, the maximum temperature in contact area rose remarkably, meanwhile transient temperature rise in region where particle settles was great. When particle moved close to meshing teeth surfaces, the minimum film thickness and maximum temperature decreased. The effects of particle spin clockwise on the minimum film thickness and maximum temperature were distinct. The influence of spin clockwise and spin counterclockwise on transient temperature in contact region was striking. Temperature in region where particle settled rose dramatically. When spin angular velocity increased, the minimum film thickness diminished, the maximum temperature rose, temperature rise in region where particle settled increased.