In order to solve the problem of aero-gear pump gear-shaft/bearing gap lubrication under high load condition

CFD simulation and gear-shaft rigid model were combined to realize the transient lubrication calculation based on the CFD radial motion coupled analysis. The bearings film three-dimensional thermohydrodynamic lubrication calculation model and rough surface micro-asperity contact model were established. On the basis of calculation of the gear-shaft radial motion orbit on the gear pump transient field influence

the model was used to achieve the analysis of the characteristics under high eccentricity/contact condition. Results showed that: the error between gear pump simulation results and experimental results was less than 10%. And the transient behavior of pressure distribution caused by gear pump transient field had an impact on the fluctuation shape of gear shaft radial load

leading to the change of bearings lubrication characteristics. By the numerical calculation for bearings lubrication model

it was found that: compared with non-contact condition

journal bearings lubrication state was more serious on the contact condition

with the higher temperature and lower viscosity.