内燃机活塞处于复杂的受热状态 :被缸内燃气的瞬时加热和冷却 ;活塞组与气缸套的动接触传热 ;冷却油腔及油束的对流换热等。确定上述各部分换热的边界条件成为活塞传热研究的重点和难点。本文采用耦合分析的方法将活塞及与其相互作用的各个部件作为一个整体进行研究 ,由此确定活塞各边界上的边界条件。并以 110型柴油机活塞为实例 ,应用上述方法确定边界条件 ,对活塞进行三维有限元计算 ,计算结果同实验值良好吻合 Internal combustion engine piston in a complex state of heating: by the cylinder instantaneous heating and cooling of gas; piston and cylinder liner moving contact heat transfer; cooling oil and oil bundle convection heat transfer. Determine the above-mentioned parts of the heat transfer boundary conditions as the piston heat transfer research focus and difficulty. In this paper, the piston and its interaction with the various components as a whole to study the coupling analysis method to determine the boundaries of the piston boundary conditions. Taking the 110 piston of diesel engine as an example, the boundary conditions were determined by the above method, and the three-dimensional finite element method was used to calculate the piston. The calculated results were in good agreement with the experimental values