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    • Effects of Cylinder Liner Out-of-Round Deformation on Sealing Performance and Friction Loss of the Piston–Cylinder Liner Friction Pair Under Different Loads
    DOI：10.13949/j.cnki.nrjgc.2022.05.013
    Key Words:load  cylinder liner  out-of-round deformation  friction loss  sealing performance
    Author NameAffiliationE-mail
    BI Yuhua* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China yuhuabi97@sina.com 
    ZU Song Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    LIU Shaohua* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 1119175410@qq.com 
    SHEN Lizhong Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    CHEN Siji Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WANG Zhi Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
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    Abstract:The dry cylinder liners of a non-road high-pressure common-rail diesel engine were selected as the research objects. A method of combining simulation analysis and bench test was used to study the comprehensive deformation characteristics of the cylinder liners under the thermal state， thermal–preload state， thermal–preload state with interference fit， thermal–mechanical coupling， and thermal–mechanical coupling with interference fit condition， respectively. In addition， the effects of different deformation characteristics on friction loss， blow-by， and lubricating oil consumption of the piston–cylinder liner friction pair were also studied. The results show that under the thermal state condition， the friction loss is the maximum 1.09 kW. Under the thermal–preload condition， the oil consumption is the maximum 4.29 g/h. Under the thermal–preload state with interference fit condition， the blow-by volume is the maximum 15.71 L/min. By applying bolt preload on the liners under thermal state condition， the friction loss reduced and the oil consumption and blow-by increased. With the superposition of the interference fit load， the friction loss and blow-by increased， and the oil consumption decreased. With the interference fit load applied on the liners under thermal–mechanical coupling condition， the friction loss， oil consumption， and blow-by all increased.
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