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一台东方红-75型拖拉机在作业中又出现了发动机功率严重不足、排气冒黑烟以及发动机游车现象,检查后发现喷油泵凸轮轴滚键。这类故障以前曾发生过多起,不但喷油泵凸轮轴滚了键,而且凸轮轴也相应地产生了裂纹。我们就这个问题既请教过有经验的老师傅,又请教过专业老师,均没有得到理想的答案。为了搞清这个问题,我们仔细地研究了喷油泵传动联接部件的构造和工作原理,进行了思考,并研究了花键轴套零件图,分析了各零件之间的标准配合间隙和极限间隙。综合对比后发现,当花键轴套与花键接盘的键顶配合间隙小到0.05 mm时,就和定
A Dongfanghong -75 tractor in the operation appeared serious lack of engine power, exhaust black smoke and the phenomenon of engine travel, check and found that the camshaft injection pump button. Such failures have occurred before too much, not only the fuel injection pump camshaft roll keys, but also the corresponding camshaft cracks. We asked both experienced teachers and experienced teachers about this issue, and neither of them got the ideal answer. In order to clarify this issue, we carefully studied the structure and working principle of injection pump drive coupling parts, thinking, and studied the spline sleeve parts map, analysis of the parts with the standard fit clearance and limit clearance. After a comprehensive comparison found that when the spline sleeve and spline access key top clearance as small as 0.05 mm, and set