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    • Research on the Lubrication Characteristics of Piston Pin–Bushings in Reciprocating Engines
    DOI：10.13949/j.cnki.nrjgc.2023.03.003
    Key Words:reciprocating engine  piston pin–bushing  tribology  dynamics  lubrication
    Author NameAffiliationE-mail
    SUN Sicong* School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China 1059433767@qq.com 
    YANG Xin* Shanghai Marine Diesel Engine Research Institute， Shanghai 200090， China 13611633711@163.com 
    ZHOU Jianming Shanghai Marine Diesel Engine Research Institute， Shanghai 200090， China zhoujianming@micropowers.com 
    CAI Yong Shanghai Marine Diesel Engine Research Institute， Shanghai 200090， China caiyong@micropowers.com 
    YANG Jianguo School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China
    Key Laboratory of Marine Power Engineering Technology Transportation Industry， Wuhan 430063， China     		jgyang@whut.edu.cn 
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    Abstract:To address the problem of lubrication mechanism inconsistency between the test rig and the piston pin–bushing， a dynamical model coupling tribological characteristics with a novel engine piston pin–bushing test rig was established， and the effects of the different clearances and the roughness on the lubrication performance based on the experimentally validated model was comparatively analyzed. The results showed that increasing the piston pin–bushing clearance within a moderate range increases the overall percentage of hydrodynamic lubrication， thins the local minimum oil film thickness， increases the frictional power consumption generated by hydrodynamic lubrication， and decreases the frictional power consumption generated by asperity contact. As the roughness of the piston–pin bushing surface increases， the asperity contact ratio also increases， the minimum film thickness does not change much， but the average film thickness increase a lot. The average film thickness ratio also slightly increases， but the minimum film thickness ratio decreases. The frictional power consumption of hydrodynamic lubrication slightly decreases， and the frictional power consumption of asperity contact increases significantly.
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