Research and Evaluation on Thermal Load of 496ZQ Diesel Engine Piston

When the piston is working, the thermal stress and deformation of the piston caused by high temperature gas may lead to the cracks of the piston, the cementation of the piston ring and the drawing of the cylinder, which directly affect the reliability and durability of the internal combustion engine. In this paper, the thermal load of 496 ZQ diesel engine piston is studied and evaluated by ANSYS software. The results show that the maximum temperature of the first ring groove of the original piston, the maximum temperature and the maximum thermal stress of the pin seat and the maximum thermal stress of the top surface do not meet the design requirements. After the optimization of heat dam and the cooling oil chamber, the heat load index of the piston can meet the design requirements, which provides the basis for the improvement of the original piston.