Considering the development status of diesel pistons

a three-dimensional model of a heavy-duty diesel piston was established by using SolidWorks software and the finite element analysis was carried out with ANASYS software to analyze the temperature field and the stress and deformation distribution under high ambient temperature and maximum burst pressure or maximum lateral force. Results show that the piston is mainly subjected to thermal stress and deformation. The maximum coupling stress

located at the top of oil gallery

is as high as 270 MPa. The maximum deformation occurs at the top edge of piston with a deformation of about 0.08%. The deformation decreases as the height of piston reduces and rises slightly at the skirt. The thermal deformation of piston head in the direction of pin hole is greater than the coupling deformation

and their difference decreases as the height of piston head reduces. The coupling deformation of the piston in the direction perpendicular to the axis of pin hole is generally greater than in the direction parallel to the axis of pin hole. At the same time

it is found that the stress concentrations at the throat of combustion chamber

the ring groove and the pin seat are relatively obvious. Structural improvements for the above-mentioned weak areas indicate that the stress values are significantly reduced. The improved results have important guiding significance for the future piston design and development of heavy-duty diesel engines.