Transient Simulation and Cavitation Suppression During Friction Lubrication of Engine Connecting Rod Bearings
The influence of different inlet conditions on the oil film cavitation phenomenon of connecting rod bear-ings of a heavy-duty diesel engine was explored through the dynamic boundary calculation.A method of slotting on the bearing bush was proposed to suppress the cavitation phenomenon during the bearing movement.The effects of the number,depth and form of grooves on the suppression of oil film cavitation were further analyzed.It is found that the increase in the number and depth of grooves can improve the effect of oil grooves to inhibit cavitation,but the degree of improvement of the inhibition effect decreases accordingly.If cavitation occurs and collapses fre-quently,it will be more likely to destroy the bearing bush surface and cause obvious cavitation erosion compared with the stable cavitation state.Compared with the full-groove model,the half-groove model has a higher suppres-sion effect,which can reduce the maximum gas phase volume fraction of the oil film from 0.94(ungrooved)to 0.39.Combined with the reliability requirements of the overall structure of the bearing bush,selecting a half-ring single groove with an appropriate groove depth can effectively suppress the cavitation of the oil film during the bearing movement.
diesel engineconnecting rod bearingscavitation phenomenonoil sump
万方数据
维普
