论文部分内容阅读
近年来燃油消耗率已不断下降。进一步改善燃烧过程还能使其更低,但这将导致爆发压力更高。这样,活塞上的机械负荷和热负荷就高于迄今铝-钢活塞所能承担的值。因此,卡尔·许密特公司设计了一种新型活塞,它由球墨铸铁筒部和钢顶部组成,能可靠地承受高负荷。本文详细介绍广泛使用的三维有限元计算法,由此可获得新设计活塞上的机械负荷和热负荷分布状况。而且着重表明活塞顶部、筒部和活塞销座部的变形。此外还用曲线图形示明温度和应力计算值及其与测量值的比较。
In recent years, fuel consumption rate has been declining. Further improvement of the combustion process can make it even lower, but this will lead to a higher explosion pressure. In this way, the mechanical and thermal loads on the piston are higher than the aluminum-steel pistons can afford to date. As a result, Karl Schmidt designed a new type of piston consisting of a ductile iron tube and a steel top, which reliably withstand high loads. This article details the widely used three-dimensional finite element method, which can be obtained on the new design of the piston mechanical load and thermal load distribution. It also highlights the deformation of the piston crown, barrel and piston pin seating. In addition, graphs of temperature and stress calculations and their comparison with measured values are also shown.