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qi men yao bi duan lie de yi zhong yuan yin
Author(s): 
Pages: 35
Year: Issue:  10
Journal: Farm Machinery

Keyword:  进气门摇臂啮合间隙气门导管异常响声气缸垫撞击力上端面气门室配气相位气门弹簧;
Abstract: <正>我厂大修的一台丰收—27拖拉机试车时,发动机产生"叭叭叭"的异常响声,排气管断续冒黑烟。用断缸法检查,当将二缸供油切断时,黑烟消失。拆开气门室罩,发现二缸进气门摇臂断裂。开始我们检查了配气相位、气门下陷度、活塞顶距机体上平面的高度、气缸垫的厚度、定时齿轮的啮合间隙等,均符合技术要求。后来发现原来是更换二缸进气门导管时,导管露出缸盖的高度超过规定值。工作中,当摇臂顶开进气门时,气门弹簧上座的下平面碰及气门导管上端面,使摇臂承受了一个额外的撞击力,在此力的
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