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    • Experimental Study on Friction Characteristics of Eccentric Cam–Tappet Pairs
    DOI：10.13949/j.cnki.nrjgc.2022.05.012
    Key Words:eccentric cam  coefficient of friction  slide-roll ratio  shear strain rate  contact zone load
    Author NameAffiliationE-mail
    ZHANG Xiaoxiao* School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266525， China xiaoxiaozhang176@163.com 
    LI Shuyi School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266525， China  
    GUO Feng* School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266525， China mefguo@163.com 
    CHAO Shen Weichai Power Co.， Ltd.， Weifang 261061， China  
    LIU Cheng Weichai Power Co.， Ltd.， Weifang 261061， China  
    ZHU Guixiang Weichai Power Co.， Ltd.， Weifang 261061， China  
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    Abstract:A custom-made oil film lubrication measurement system was used to study the friction characteristics of an eccentric cam–tappet tribo-pair under different working parameters （cam speed， initial load， lubricant viscosity and cam eccentricity）. The results show that the friction coefficient increases at the first and then decreases with increasing cam angles， and reaches its maximum value when the tappet gets its maximum lift. The cam speed can change the friction coefficient of the eccentric cam-tappet tribo-pair by means of influencing the actual load and shear strain rate in the contact area. With the increase of the initial load， the maximum friction coefficient decreases and the minimum friction coefficient increases. The friction coefficient increases with the increase of lubricant viscosity. The increase of cam eccentricity changes the friction coefficient by affecting the slide-roll ratios.
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