Spray orientation parameters influencing lubrication initial conditions of gear meshing point were systematic definied through the analysis of spray lubrication process of aero spur gears

then the computational fluid dynamics(CFD) method of spray lubrication process was established. Three kinds of spray parameter including spray angle

spray point position and spray distance were calculated

jet states were obtained with different meshing instantaneous of gears. The varying rules of the oil/air ratio and oil/air total pressure at the entrance of contact point were compared in the meshing process under different spray parameters.Result show that

nozzle should offset a small angle to driving wheel when spray lubrication using engaging-in side in order to get better lubricating effect

and spray point position should offset engaging-in side

spray distance should take into account the structure

working condition

not general idea that the closer the better.