Analysis and Verification of Oil Injection Lubrication Thermal Characteristics of Aircraft Engine Accessory Casing Bearings
DONG Shuaihao
NIU Rongjun
ZHAO Xinhao
WANG Dandan
WANG Jingjing
Abstract：To investigate the precise thermal characteristics of aero-engine accessory gearbox bearings under oil-jet lubrication and improve the lubrication effectiveness of ball bearings in the accessory gearbox,a high-speed 6209 ball bearing was taken as the research object.A bidirectional coupling model between friction heat generation and flow-field temperature distribution was established to analyze the influence of lubrication and operating parameters on the temperature field.The research shows that the increase of bearing speed and load increases the temperature rise of bearing.The increase of oil supply takes away more heat and increases the churning loss,which offsets the original cooling effect of some lubricating oil.Under given conditions,when the oil supply reaches 1.1 L/min,the lubrication effect of the bearing cannot be significantly improved by increasing the oil supply.When the number of nozzles reaches 3,the cooling efficiency also reaches the critical value.The increase of ambient temperature systematically weakens the heat dissipation capacity,resulting in the continuous increase of the temperature of the inner and outer rings of the bearing.
Keywords：accessory gearbox bearingfluid-thermal couplinglocal heat generation methodoil-injection lubricationtemperature field
Publication Date：2026-02-25
Online Publishing Date：2026-03-19(First online date of this platform, not the publication date of the document)
Pages：11( 13-23 )