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    • Study on the Influences of Cavitation Effect on Lubrication and Dynamic Characteristics of Connecting Rod Bearing
    DOI：10.13949/j.cnki.nrjgc.2024.05.006
    Key Words:cavitation effect  connecting rod small end bearing  lubrication
    Author NameAffiliationE-mail
    BI Yuhua* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 13317019@kust.edu.cn 
    DUAN Leilei Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 2635738311@qq.com 
    MA Xiong Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 1152654240@qq.com 
    ZHANG Guoqiang Kunming Yunnei Power Co.， Ltd.， Kunming 650217， China 19887120042@163.com 
    TANG Mingchao Kunming Yunnei Power Co.， Ltd.， Kunming 650217， China 180 8705 7723@163.com 
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    Abstract: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.
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