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    • Experimental Study on the Friction Performance of Roller–Pin Pair in the Valve Train of an Internal Combustion Engine
    DOI：10.13949/j.cnki.nrjgc.2025.02.013
    Key Words:valve train  roller–pin friction pair  friction torque  low-viscositylubricants
    Author NameAffiliationE-mail
    XU Leiyu School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China 2043600441@qq.com 
    GAO Yuanjie School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China 1522799036@qq.com 
    LIU Yan Siempelkamp （Qingdao） Machinery and Equipment Co.， Ltd.， Qingdao 266426， China yanliu76@126.com 
    GUO Feng* School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China mefguo01@qut.edu.cn 
    CHAO Shen State Key Laboratory of Engine and Powertrain System， Weifang 261061， China
    Weichai Power Co.， Ltd.， Weifang 261061， China     		chaoshen@weichai.com 
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    Abstract:In order to investigate the tribological performance of the roller-pin pair， a test rig was designed and constructed to measure the frictional torque of the roller–pin pair during the full cam cycle， to study the effects of cam speed， spring initial load and oil viscosity on the frictional torque of the roller–pin pair， and to calculate the normal load and friction coefficient of the contact area of the roller–pin pair. The results indicate that the friction moment of the roller-pin pair is greater in the cam nose region and smaller and more stable at the cam base circle. The normal load in the contact area of the roller–pin pair is influenced by inertia forces， which are more pronounced at higher cam speeds. The average frictional moment of the roller–pin pair increases with the increase of the initial spring load， increases with the decrease of the lubricating oil viscosity， decreases first and then increases with the increase of the cam speed when lubricated with low-viscosity oils， and gradually increases with the increase of the cam speed when lubricated with higher-viscosity oils.
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