1.滨州渤海活塞有限公司，山东 滨州 256602；
2.山东省发动机活塞摩擦副重点实验室，山东 滨州 256602
Abstract：In order to effectively reduce the surface temperature of the piston with internal cooling oil chamber, the piston structure of a diesel engine is optimized by increasing the diameter of the oil inlet，the height of the oil inlet and outlet of the internal cooling oil chambe. The temperature field analysis model of piston is established, and the results of piston temperature field before and after optimization are calculated by using the finite element analysis software. The results show that the temperature of each key part of the piston is reduced after improvement, the temperature of the combustion chamber throat with the highest piston temperature is reduced by 4℃; the cooling effect at the bottom of the combustion chamber is remarkable, and the temperature is reduced by 11℃. The structural optimization is reasonable and effective, which can provide a reference for the optimal design of internal cooling oil chamber of diesel engine piston.
Keywords:diesel engine piston; temperature field; cooling gallery; hardness plug