汽车原理及构造-4-返蘑动机构造_曲柄连杆机构.ppt

机体组及曲柄连杆机构 第一节 概述 第二节 机体组 第三节 活塞连杆组 第四节 曲轴飞轮组 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第一节 概述 功用：发动机借以产生并传递动力的机构。通过它把燃料燃烧后发出的热能转变为机械能。 主要零件组成：机体组、曲柄连杆机构（活塞连杆组、曲轴飞轮组） 工作条件的特点：恶劣、高温、高压、高速、化学腐蚀 受力状况：复杂、周期性 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 曲柄连杆机构中的作用力及力矩 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第二节 机体组 一、气缸体 基本要求：强度、刚度；冷却性能；质量小；耐磨性好。 多个气缸排列型式 气缸体结构型式：整体式、缸套式 气缸材料：铸铁、铝合金 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第二节 机体组 一、气缸体 冷却方式 水套 气缸套：干式、湿式 曲轴箱：上、下 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第二节 机体组 一、气缸体 二、气缸盖 气缸盖结构 气缸盖材料：铝合金 汽油机燃烧室：5种 柴油机燃烧室：2种 气缸盖衬垫结构：弹性、通孔、安装方法 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 油底壳 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 汽油机燃烧室 1)浴盆形燃烧室，结构简单，气门与气缸轴线平行，进气道弯度较大。压缩行程终了能产生挤气涡流。 2)楔形燃烧室，结构比较紧凑，气门相对气缸轴线倾斜，进气道比较平直，进气阻力小。压缩行程终了时能产生挤气涡流。 3)半球形燃烧室，结构最紧凑，燃烧室表面积与其容积之比(面容比)最小。进排气门呈两列倾斜布置，气门直径较大，气道较平直。火焰传播距离较短，不能产生挤气涡流。 4)多球形燃烧室是由两个以上半球形凹坑