某240型柴油机活塞有限元分析

Finite Element Analysis of Piston in 240 Diesel Engine

活塞组由活塞、活塞销、活塞环等零件组成。活塞是内燃机的关键零部件之一,活塞的结构和所处的工作环境都十分复杂,在工作状态下受到高压燃气压力、高速往复运动产生的惯性力和销座支反力等周期性载荷作用,产生机械应力和机械变形。高压气体燃烧产生的高温使活塞温度分布很不均匀,导致活塞产生热应力和热变形。因此,对活塞在热负荷和机械负荷共同作用下的变形、应力进行有限元分析,了解活塞的变形和应力分布情况,对改进活塞设计,提高其工作可靠性具有意义。

Piston set are constitute by the piston, piston pin, piston tings and other parts. The piston is one of the key components of internal combustion engine, its structure and working environment is complex. Received the high gas pressure, high-speed reciprocating inertia force and support reaction force of pin scat cyclical loading, it results in mechanical stress and mechanical deformation. High temperature combustion and high pressure gas make the piston temperature distribution uneven, which results in piston thermal stress and thermal deformation. Therefore, the element analysis of piston in the heat load and mechanical toad is significant, the finite element analysis show the deformation and the stress distribution of the piston. It is meaningful for improved piston design and reliability.