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    • Study on the Influences of Skirt Stiffness on the Second-Order Motion of Pistons in Internal Combustion Engines
    DOI：10.13949/j.cnki.nrjgc.2023.02.006
    Key Words:skirt stiffness  thermal deformation  second-order motion  friction loss
    Author NameAffiliationE-mail
    HAN Mengyu* School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		hanmengyu78@163.com 
    JING Guoxi School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		 
    LIU Qian* School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		lqifreedom@163.com 
    LIU Yipeng School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		 
    ZENG Xiaochun Powertrain Engineering Department， Jiangling Motors Corporation Limited， Nanchang 330001， China  
    CHEN Guang School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		 
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    Abstract:Aiming at the influence of skirt stiffness on piston motion， the piston stiffness test tool was designed to measure the skirt meridian stiffness， and the accurate piston stiffness matrix was obtained by combining with the finite element calculation. On the basis of considering the thermal deformation of piston and cylinder liner， the dynamic simulation model of piston was established， and the second-order motion of pistons with different skirt structures was analyzed. The analysis results show that with the increase of skirt stiffness， the radial displacement， swing angle and kinetic energy during the piston movement are reduced， and the amplitude of the second-order motion is reduced within a certain range. The friction loss between piston and cylinder liner can be effectively reduced by moderately reducing the stiffness of skirt secondary antithrust side（ATS）， and the lightweight and low friction design of piston can be realized.
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