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    • Study on the Effects of Self-Oil Collection Coating on the Limited Lubrication Performance of Cam–Tappet Pairs
    DOI：10.13949/j.cnki.nrjgc.2024.05.005
    Key Words:cam–tappet  wettability gradient  limited oil supply  self-oil collection enhancement
    Author NameAffiliationE-mail
    LI Changteng School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China li15069531970@foxmail.com 
    LI Shuyi* School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China mesyli@qut.edu.cn 
    LIU Minghai School of Mechanical and Automotive Engineering， Qingdao University of Technology， Qingdao 266520， China liuminghai678@163.com 
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    Abstract:A patterned functional surface with arc-shaped oleophobic zones alternating with the original oleophilic zones was designed and prepared to achieve automatic aggregation of a small amount of lubricant and to explore the improvement of limited lubrication performance on the cam–tappet sub-surface. The results show that the coated functional surface leads to a wettability gradient on the surface of the cam–tappet sub-surface， limiting the directional flow of the lubricant without external force， increasing the oil supply amount to the contact area and thus improving the lubrication performance. The effects of oleophilic track width on lubricant return are not uniform， and a suitable width design can produce a good oil collection effect. The high viscosity lubricant is hindered by the pinning effect to flow outward during the extrusion stage. The moving parts are in a serious oil-shortage state when the oil supply amount is reduced to 0.5 μL， and the oil collection surface cannot play a role in improving the lubrication effect.
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