Analysis of cracking of aluminum piston pin hole for high-strength diesel and its improvement
Based on the analysis of the failure mechanism on the problem of pin hole cracking in the endurance test of aluminum piston of high-strength diesel engine,the main reason of piston failure is that the elliptical deformation of piston pin is too large,which makes the horizontal force on the pin hole position greater,which brings insufficient fatigue strength.The optimize structure of the piston pin hole is improved by changing the cylindrical hole into the elliptical hole,reserving the space in the piston pin hole position,changing the piston pin inner hole bell mouth to the through hole,the finite element analysis software is then used to simulate and calculate the optimization scheme,and the results are verified by fatigue test and durability test.The results show that the average load of the piston pin hole increases by about 6.5%,and the piston pin hole does not crack.