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    • Influence of Clearance Shape of Small Head Friction Pair of Connecting Rod on Lubrication and Impact Characteristics of Piston Pins
    DOI：10.13949/j.cnki.nrjgc.2023.04.008
    Key Words:diesel engine  connecting rod end bushing  profile design  flexible multi-body dynamics  lubricating characteristic  impact characteristic
    Author NameAffiliationE-mail
    BI Yuhua* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China yuhuabi@sina.com 
    YANG Yueshan Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China yangyueshan2020@163.com 
    LIU Shaohua* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1119175410@qq.com 
    LIANG Jiabao Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 775281417@qq.com 
    DENG Wei Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1323364897@qq.com 
    HOU Fei Yunnan Xiyi Industrial Co.， Ltd.， Kunming 650114， China 1324818646@qq.com 
    SHEN Lizhong Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 594699661@qq.com 
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    Abstract:In order to improve the lubrication and impact characteristics between the full floating piston pin and the small head of connecting rod of diesel engine， a flexible multi-body dynamics model of piston and connecting rod group was established by AVL Power Unit based on the elastohydrodynamic lubrication theory and rough peak contact theory. Considering the influence of small head bushing of connecting rod with different parabolic profile and triangular profile scheme， lubrication and piston pin impact characteristics of connecting rod small head bearing was studied. Results show that the parabolic bushing has the best lubrication and impact characteristics， while the triangle bushing can not form effective lubrication due to the large average clearance， and the lubrication and impact characteristics are relatively poor. The minimum oil film thickness of the parabolic bushing is 0.104 μm higher than that of the linear bushing. The maximum peak oil film pressure decreased by 8.29 MPa on average， the average peak oil film pressure increased by 7.62 MPa， and the maximum peak rough contact pressure decreased by 77.19 MPa on average. Considering the characteristics of small head bearing lubrication and piston pin impact， parabolic bushing with the maximum radial cutting of 12 μm is the best small head bushing profile scheme of connecting rod. The impact performance of small head bearing lubrication and piston pin impact of connecting rod is improved greatly， and the minimum oil film thickness increases by 0.170 μm. The maximum value of peak oil film pressure and peak rough contact pressure decreases by 8.28 MPa and 119.49 MPa respectively. The peak value of longitudinal acceleration of piston pin relative to the small head of connecting rod in the early intake stroke and late exhaust stroke decreases by 0.33 mm/s2 and 0.24 mm/s2 respectively.
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