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近年来,汽车发动机的一种设计趋向,是采用顶置式凸轮轴,因为这种结构可以改善发动机的高速性能,并能减少零件,便于装配和维修保养。但是也带来一些问题,凸轮和摇臂摩擦副早期磨损,是比较突出的问题之一。我厂生产的上海牌轿车用的680发动机,从1959年试制以来,摇臂先后采用锻钢镀硬铬和合金铸铁堆焊,摇臂和凸轮磨损问题,时好时坏。近年来,我们将摇臂改为马铁镀铬,质量仍不稳定。我厂1966年设计,1969年开始生产的2吨载重汽车用的490Q型发动机,开始
In recent years, one of the design trends for automotive engines has been the use of overhead camshafts as this structure can improve the high speed performance of the engine and reduce parts for ease of assembly and maintenance. But it also brings some problems. The early wear of cam and rocker friction pair is one of the more prominent problems. I plant the Shanghai brand cars with 680 engines, trial production since 1959, the rocker has used forged hard chrome plated steel and alloy cast iron surfacing, rocker and cam wear problems, good times and bad. In recent years, we have changed the rocker to horse iron chrome, the quality is still not stable. Our factory designed in 1966, the 490Q engine for 2 tonne truck started production in 1969, started