学号: 商丘工学院 2012 届毕业生毕业论文(设计) 题目汽车发动机气门间隙调整方法系别机电工程系专业汽车检测与维修学生姓名 00 专业班级 2009 级汽车检测与维修 0班指导教师 000 【摘要】所谓气门间隙就是指:发动机在冷却状态时,在所门传动机构中,留有一定的间隙。以补偿气门及传动机构受热后的膨胀量。发动机在冷态下,当气门处于关闭状态时,气门与传动件之间的间隙称为气门间隙。间隙过大:进、排气门开启迟后,缩短了进排气时间,降低了气门的开启高度, 改变了正常的配气相位,使发动机因进气不足,排气不净而功率下降,此外,还使配气机构零件的撞击增加,磨损加快。间隙过小:发动机工作后,零件受热膨胀,将气门推开,使气门关闭不严, 造成漏气,功率下降,并使气门的密封表面严重积碳或烧坏,甚至气门撞击活塞。采用液压挺柱的配气机构不需要留气门间隙。气门摇臂与气门的间隙(即气门间隙)之所以存在,是因为进排气门均安装在燃烧室的顶端,也是温度最高之处,为了留有膨胀的空间,因而必须存有空隙, 【关键字】: 气门间隙; 进排气门; 气缸;调整目录 1气门间隙························································································· 3 采用液压挺柱的配气机构不需要留气门间隙。······································ 4 ············································································ 5 拆下气门间隙的室盖············································································ 5 找到一缸压缩上止点············································································ 6 确定各缸处于压缩上止点的方法···························································· 6 测量气门间隙····················································································· 6 调整气门间隙····················································································· 7 3气门间隙的调整方法········································································· 8 方法(一) ···························································································· 8 方法(二) ·························································································· 10 ······················································ 12 内燃机气门间隙对其性能的影响·························································· 12 内燃机气门的大小在使用,维修中的变化·············································· 12 内燃机气门间隙调整的方法································································· 13 逐缸调整法······················································································ 13 5. 装复检查······················································································ 15 6. 调整气门间隙的原因········
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