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近来,我们对我县57名机手进行了调查,他们一致认为:拖拉机配件的使用寿命远不如原机装配零件;配件的几何精度不高,配合间隙不合要求。 (1) 缸套、活塞、气门、齿轮、轴承等配件硬度不够东八里乡上八里村有个机手,买了两个河北-12型拖拉机变速箱齿轮,只使用两天就磨出了大台阶,原来齿轮未经淬火处理。 (2) 凸轮轴、柱塞副、喷油嘴等配件精度不够,有的新凸轮轴配气相位偏差5°以上,有的甚至偏差
Recently, we conducted a survey of 57 aircraft in our county, they agreed that: the service life of tractor spare parts far less than the original machine assembly parts; parts geometric accuracy is not high, with the gaps do not meet the requirements. (1) Cylinder liner, piston, valve, gear, bearings and other accessories hardness is not enough Eight miles in the village of East Bali have a hand, bought two Hebei -12 tractor gear, only two days to use a large mill Step, the original gear without quenching. (2) camshaft, plunger pair, nozzle and other accessories accuracy is not enough, and some new camshaft gas phase deviation of more than 5 °, and some even deviation