发动机教案.pdf

山西省农业机械化学校教案授 课 日 期2013、10、30 时间分配复 习 提 问5分 钟所 需 学 时4 内 容 讲 授分 钟累 计 学 时课 堂 小 结5分 钟课题：项 目 三配 气 机 构 的 构 造 与 检 修任 务 2 配 气 机 构 气 门 组 的 构 造 与 检 修教学目的：1、掌 握 配 气 机 构 气 门 组 的 作 用、组 成 以 及 各 零 件 的 装 配 关 系；2、掌 握 配 气 机 构 气 门 组 主 要 零 件 的 构 造 与 检 修。教学重点：气 门 组 主 要 零 件 的 构 造 与 检 修教学难点：气 门 座 的 铰 削教 学 方 法 及 教 改 手 段：理 实 一 体 化教学用具：丰 田-5A 发 动 机；农 用 车 柴 油 发 动 机；铰 刀；气 门 光 磨 机 等教 材 分 析 及 教 学 内 容：精品资料-欢迎下载-欢迎下载 名师归纳-第 1 页，共 11 页 -项目三配气机构的构造与检修任务 2 配气机构气门组的构造与检修回忆前面的内容导入新课配气机构的作用配气机构的组成配气机构的类型相关知识：一、配气机构气门组的功用和组成气门组的作用是实现对气缸的密封。气门组包括气门、气门座、气门导管、气门弹簧、气门弹簧座及锁片等零件，如图 3-18 所示。气门组零件安装在气缸盖上。气门穿过气门导管，气门弹簧套装在气门杆上，一端支承在气缸盖上，另一端支承于装在气门杆尾端的弹簧座上，用锁片或锁销固定于气门杆尾端的环槽内。气门弹簧安装时具有一定的预紧力。当气门关闭时，在气门弹簧预紧力的作用下，气门头部密封锥面压紧在气门座上，将气道封闭。二、气门组主要零件的构造1、气门气门分进气门和排气门两种,进、排气门结构相似，都由头部和杆部两部分组成。头部与气门座配合，封闭气缸进、排气通道；杆部穿过气门图 3-18 气门组的组成精品资料-欢迎下载-欢迎下载 名师归纳-第 2 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7导管，在导管中上下运动，主要为气门的运动起导向作用。气门头部的结构形式有平顶、喇叭形顶和球面顶等，如图3-22 所示。气门头部与气门座接触的工作面，是与杆部同心的锥面，起到密封气道的作用，因此也称气门密封锥面。通常将这一锥面与气门顶平面的夹角称为气门锥角。气门锥角的大小不仅影响气门的密封性，还影响气流阻力、气流通过面积和锥面的磨损。在气门升程相同的情况下，气门锥角越小，气门口通道截面宽度越大，进气阻力小。但由于锥角小，气门头部边缘薄，强度与刚度较小，工作中容易变形，而且气门的密封性与导热性较差。一般进气门的锥角有45和 30两种，排气门的锥角都是 45，如图 3-23 所示。气门头部的边缘应保持一定厚度，一般为 13mm，以防止工作中由于气门与气门座之间的冲击而损坏或被高温气体烧蚀。为了减少进气阻力，提高气缸的充气效率，多数发动机进气门的头部直径比排气门的大。气门杆部呈圆柱形，在气门导管中不断进行往复运动，起到良好的导向和散热作用。气门杆端的形状决定于气门弹簧座的固定方式，如图 3-24所示。图 3-22 气门头部的形状图 3-23 气门锥角图 3-24 气门弹簧座的固定方式1-气门杆；2-气门弹簧；3-气门弹簧座；4-锥形锁片；5-锁销精品资料-欢迎下载-欢迎下载 名师归纳-第 3 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7常用的结构是用剖分或两半的锥形锁片4 来固定气门弹簧座3（图3-24a），这时，气门杆 1 的端部可切出环槽来安装锁片。有些发动机的气门弹簧座用锁销 5 来固定（图 3-24b），故其气门杆端有一个用来安装锁硝的径向孔。2、气门座进、排气道口与气门密封锥面直接贴合的部位称为气门座。气门座的功用是：与气门头部一起对气缸起密封作用，同时接受气门头部传来的热量，起到对气门散热的作用。气门座可在气缸盖上直接镗出，也可用较好的材料（合金铸铁、奥氏体钢等）单独制作，然后镶嵌到气缸盖上，如图3-25 所示3、气门导管气门导管主要起导向作用，保证气门做直线往复运动，使气门与气门座能正确贴合。此外，气门导管还在气门杆与气缸盖之间起导热作用，其结构如图3-25 所示。气门导管与气缸盖上的气门导管孔过盈配合。有些发动机为防止气门导管松脱，在气门导管外圆上开有卡环槽，采用卡环对气门导管进行固定与定位。气门杆与气门导管之间一般留有 0.050.12mm 的间隙，使气门杆能在导管中自由运动，同时也保证气门和气门座锥面的精确配合。4、气门弹簧气门弹簧的功用是：克服在气门关闭过程中气门及传动件的惯性力，防止各传动件之间因惯性力的作用而产生间隙，保证气门及时落座并紧密贴合，防止气门在发动机振动时发生跳动，破坏其密封性。气门弹簧多为圆柱形螺旋弹簧（图3-26a），其材料为高碳锰钢、铬钒钢等冷拔钢丝。气门弹簧的一端支承在气缸盖上，而另一端则压靠在气门杆端的弹簧座上，弹簧座用锁片固定在气门杆的末端。气门弹簧在工作时，当其工作频率与自然振动频率相等或成某一倍数时，将会发生共振。为了防止这一现象的发生，可采取如下措施：（1）提高气门弹簧的自然振动频率，即提高气门弹簧的自身刚度。（2）可采用不等螺距的圆柱弹簧（图3-26b），这种弹簧在工作时，图 3-25 气门导管和气门座1-气门导管；2-卡环 3-气缸盖；4-气门座精品资料-欢迎下载-欢迎下载 名师归纳-第 4 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7螺距小的一端逐渐叠合，有效圈数逐渐减小，自然频率逐渐提高，使共振成为不可能，如红旗轿车的8V100 发动机气门弹簧。（3）采用双气门弹簧（图3-26c）。一些高速发动机通常在一个气门上同时安装两根直径不同、旋向相反的内外弹簧，这样能够提高气门弹簧的工作可靠性，即可以防止共振，而且当一根弹簧折断时，另一根还可维持工作，可防止折断的弹簧圈卡入另一个弹簧圈内，此外还能使气门弹簧的高度减小。当装用两根气门弹簧时，弹簧圈的螺旋方向应相反。实践操作：操作一气门组零件的正确拆装1、认识气门弹簧拆装架气门弹簧拆装架是一种专门用于拆装顶置气门弹簧的工具，如图3-20 所示。使用时，将拆装架托架抵住气门，压环对正气门弹簧座，然后压下手柄，使得气门弹簧被压缩。这时可取下气门弹簧锁销或锁片，慢慢地松抬手柄，即可取出气门弹簧座、气门弹簧和气门等2、气门组零件的拆装气门组零件的拆卸（1）拆下气缸盖。安放合适的位置，便于气门弹簧拆装架的使用。（2）用气门弹簧钳拆卸气门弹簧，依次取出锁片、弹簧座、弹簧和气门。锁片应用尖嘴钳取出，不得用手取出。将拆下的气门作好相应标记，图 3-26 气门弹簧图 3-20 气门弹簧拆装架精品资料-欢迎下载-欢迎下载 名师归纳-第 5 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7按顺序放置。各缸气门不可互换。（3）用气门油封钳取出油封（4）用专用工具取出气门导管。气门组零件的装配（1）清洗气门、气缸盖各部位（2）将气门导管涂上发动机润滑油后，用专用工具安装到气缸盖上。（3）将气门油封涂上发动机润滑油后，用专用工具安装到气缸盖上。必须更换新的油封。（4）润滑气门杆，按记号将气门分别装入气门导管内，注意不要损伤油封。（5）翻转缸盖，装上气门弹簧、挡油罩和弹簧座。用气门弹簧钳分别压紧气门弹簧，装上锁瓣（锁瓣装入后应落入弹簧座孔中，并使两瓣高度一致，固定可靠）。如图 3-21 所示。锁片装好后，用塑料锤轻敲几下，以确保锁止可靠。（6）安装气缸盖。（7）清洁整理工具和现场。操作二气门的检修气门的常见耗损是：气门杆部及尾部的磨损、气门工作锥面磨损与烧蚀和气门杆的弯曲变形等。气门出现下列耗损之一时，应予以换新：（1）轿车气门杆的磨损大于0.05mm，载货汽车气门杆的磨损大于0.10mm，或出现明显的台阶形磨损。气门杆磨损量的测量方法和测量部位如图 3-27 所示。（2）气门头部边缘的厚度小于 1.0mm。（3）气门尾端的磨损大于 0.5mm（有不平或起槽）。（4）气门杆的直线度误差大于 0.05mm 时，应予以更换或校直，校直后的直线度误差不得大于0.02mm。用百分表检查气门杆的弯曲，如图3-28 所示。图 3-27 气门杆磨损量的测量图 3-21 气门的安装精品资料-欢迎下载-欢迎下载 名师归纳-第 6 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7气门工作锥面的修理如图 3-29 所示，气门工作锥面的修理是在气门光磨机上进行的。气门的光磨工艺如下：（1）光磨前应先将气门进行校直。（2）将校直的气门杆紧固在夹架上，气门头部伸出长度约40mm，并按气门规定的工作锥面角度调整夹架。（3）查看砂轮工作面是否平整。（4）开动夹架电动机，观察气门是否摇摆，若摆动过大应重新校直。（5）开动砂轮电动机和冷却液开关进行光磨。光磨后，气门工作锥面的径向 圆 跳 动 误 差 应 不 大 于0.01mm，表面粗糙度Ra 小于1.25 m，对气门杆部的同轴度误差应不大于 0.05mm.操作三气门座的镶换、铰削气门座的磨损主要是磨料磨损和由于冲击载荷造成的硬化层脱落，以及由于高温燃气所导致的腐蚀和烧蚀。气门座的磨损，使得图 3-28 气门杆弯曲的检查1-气门；2-百分表；3-顶尖；4-检验平板；5-V 形块图 3-29 气门光磨机1-刻度盘；2-横向手柄；3-夹架；4-夹架固定螺钉5-气门；6-冷却液开关；7-砂轮；8-纵向手柄9-砂轮电动机开关；10-夹架电动机开关精品资料-欢迎下载-欢迎下载 名师归纳-第 7 页，共 11 页 -文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8P4 HG5M9M1O7D4 ZR6B9J1J1G7文档编码:CS7F4I3B8