Lubrication Characteristics of Gear End Face Friction Pairs of Aviation High-speed Gear Pumps
Aiming at the serious wear problems of gear end face friction pairs of aviation external gear pumps,a new compound texture combining Tesla valve groove type and elliptical shape was opened on the gear end faces to improve lubrication performance.Based on hydrodynamic lubrication theory and finite element simulation calculation method,a theoretical analysis model of gear textured end face friction pair lubrication was established.Pressure distribution and velocity distribution of flu-id within the end face liquid films were simulated and analyzed under conditions with and without tex-ture,and the effects of operating and structural parameters on the openness and sealing performance of gear end faces were studied.The results show that the hydrodynamic pressure generated by the tex-ture may make the gear end face friction pairs run non-contact,which has a positive effect on reducing friction and increasing efficiency.With the comprehensive consideration of the openness and leakage control performance of gear end face friction pairs,groove depth is as 7～9 μm,height difference is as 5～6 μm,inclination angle is as 0°～10°,and shape factor is as 0.4～0.5 are the optimal structural pa-rameters for the texture structure.
high speed gear pumpend face friction paircompound texturehydrodynamic lubri-cationstructural optimization
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