Thermal-structural Coupling Analysis of Internal Combustion Engines’ Bionic Piston Skirt
WU Bo1,2, CONG Qian2, XI Peng2, YAN Zhen3
1. Engineering Training Center, Changchun Institute of Technology, Changchun 130012, China;
2. Key Laboratory of Bionic Engineering, Ministry of Education;Jilin University, Changchun 130022, China;
3. SANYHE International Holdings Co., Ltd., Shenyang 110027, China
Abstract：In this paper, the pit non-smooth structure is used in the piston-liner system of internal combustion engines, because it has relatively little friction and wear. Pits and pores are machined on the piston skirt surface, reducing the friction and wear of the piston-liner system. In this way, the working life of the system is extended. Taking XL-2V type engine for example, the stress distribution is analyzed when the standard piston motions. Using the orthogonal experiment method, this paper has established nine types of bionic pass piston test models. Thermal-structural coupling finite-element analysis of bionic and standard pistons was carried out using the third class boundary conditions in heat transfer analysis and maximum lateral pressure. The maximum deformation and radial deformation range of piston skirts were obtained. The former affected the skirt oil film thickness and the latter affected the oil film distribution uniformity degree. Finally, the first type of bionic piston was selected, which has better performance on friction reduction and wear-resistance compared with standard pistons. The results show that the uniformly distributed pit-styled bionic pores with relatively small diameters in pistons could increase the uniformity of oil films on the surface of the piston, and at the same time reduce the stress around the skirt, thus reducing the friction and wear, reducing mechanical losses, improving stiffness, and extending the working life of pistons.
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2014, Vol. 32 
