Study on the Influences of Cavitation Effect on Lubrication and Dynamic Characteristics of Connecting Rod Bearing
To study the influences of cavitation effect on the lubrication and dynamic characteristics of the connecting rod small end bearing,the combination of thermal elastohydrodynamic theory and flexible multi-body dynamics analysis of the piston and connecting rod assembly was used.The AVL EXCITE software was employed to establish a lubrication model for the connecting rod small head bearing.By calculating the oil film pressure,shaft trajectory and lubricant filling rate,the cavitation location of the connecting rod small end bearing was determined.The results show that there is always cavitation effect on the connecting rod small end bearing throughout the entire cycle of the engine.After considering the cavitation effect,the average peak oil film pressure of the bearing was reduced by 6.5 MPa,and the average oil film thickness was reduced by 1.35 μm.The velocity and acceleration of the piston pin relative to the connecting rod small end bearing increased by 1.57 μm/s and 0.25 μm/s2,respectively,which indicates that the lubrication performance of the connecting rod small end bearing deteriorates and the impact of the bearing increases.
cavitation effectconnecting rod small end bearinglubrication
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