汽车变速器及传动轴和操纵机构毕业设计.doc

目录 摘要························································3 Abstract····················································3 变速器的简介················································4 1.变速器传动机构的方案分析································6 2.变速器零、部件结构方案分析······························7 3.变速器操纵机构··········································8 1.变速器的参数选择··········································8 1.1 一档齿轮齿数的确定····································8 1.2 中心距A的选择········································9 1.3 确定齿轮参数·········································10 1.3.1 齿宽选择·······································10 1.3.2 压力角·········································11 1.3.3 齿轮螺旋角·····································11 1.3.4 校验齿轮的接触强度·····························11 1.4 变速器轴向尺寸·······································13 1.5 轴的直径·············································13 1.6 各档齿轮齿数的分配···································14 1.6.1 确定常啮合传动齿轮副的齿数·····················14 1.6.2 确定其他各档的齿数·····························15 2.变速器传动···············································16 2.1 传动简图·············································16 2.2 同步器（简介）········································16 2.2.1 惯性式同步机···································18 2.2.2 同步器工作原理·································18 2.2.3 齿轮材料·······································19 2.2.4 齿轮材料、热处理·······························20 2.2.5 齿轮精度等级···································20 3.故障诊断与检修···········································21 3.1 常见故障与检修·······································21 3.1.1 变速器的异常声响·······························21 3.1.2 变速器跳档·····································22 3.1.3 挂档困难·······································22 3.1.4 变速器乱档·····································23 3.1.5 变速器发热·····································23 3.1.6 变速器漏油·····································24 3.2 变速器零件的检修·····································24 3.2.1 齿轮与花键的检修·······························24 3.2.2 轴的检修··································