Design of a piston profile based on finite element analysis
SUN Chenyuan
FENG Xiaojing
YUAN Wentao
GU Dingfeng
Abstract：To address the uneven contact pressure distribution on the skirt and pin bore profiles of an aluminum piston in a diesel engine,a topology optimization design method is employed to collaboratively optimize the oval parameters of the skirt's transverse cross-section and the pin bore contour.Numerical simulations are conducted after iterative optimization.The results show that when the skirt's transverse cross-section adopts a superimposed corrected ellipse,combined with a double tapered pin bore structure optimized by adjusting the length of inner and outer linear segments and diameter recess,the contact pressure of the piston skirt and the peak contact pressure of the pin hole both decrease by 6%,and the contact area increases.After bench testing verification,the optimized key mating parts such as the piston skirt and pin hole have good contact,and there are no abnormal wear phenomena such as peeling on the piston surface under cyclic loading.The piston meets the durability requirements of the engine.
Keywords：pistonprofileovalitycontact pressurefinite element analysis
Publication Date：2025-07-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 75-80 )