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Abstract
Transmission is a very important component in automobile.Although the impact of the mechanical transmission is relatively large and has complex manipulation, but the transmission is efficient and simple and also has a low manufacturing cost, so it is still widely used in modern vehicles.An increase in the transmission gear, because the transmission ration between adjacent transimission gear become smaller, so the impact of the shift become smaller when the car change the gears.Based on the five-speed car on the market, the article designs a mechanical six-speed transmission according to the mechanical design of the basic principles and methods.The design contains transmission main mechanism design, synchronizer and shift control mechanism, etc., and then check the gear and shaft. KeyWords:Transmission; six-spe................................................................................................................................................................. 1 1 变速器设计方案分析 ............................................................................................................................... 2 1.1 传动结构的分析与选择 ................................................................................................................. 2 1.2 换挡结构的分析与选择 ................................................................................................................. 3 1.3 倒档结构布置 ................................................................................................................................. 5 1.4 换挡操纵结构 ................................................................................................................................. 6 1.5 其他零部件分析和选择 ................................................................................................................. 9 2 变速器主要参数的选择 ......................................................................................................................... 10 2.1 主要输入参数 ............................................................................................................................... 10 2.2 变速器传动比的选择 ................................................................................................................... 10 2.3 中心距初步计算 ........................................................................................................................... 12 2.4 齿轮参数选择 ............................................................................................................................... 12 2.5 齿轮齿数的分配 ............................................................................................................................ 13 3 变速器主要零部件的设计与计算 ........................................................................................................... 17 3.1 齿轮的几何尺寸设计计算 ............................................................................................................ 17 3.2 齿轮损坏的形式及原因 ............................................................................................................... 19 3.3 齿轮的材料选择和处理工艺 ....................................................................................................... 20 3.4 变速器齿轮强度计算 ................................................................................................................... 20 3.5 轴的结构设计与校核 ................................................................................................................. 22 3.6 花键 ............................................................................................................................................... 24 4 同步器设计与计算 ................................................................................................................................... 26 4.1 同步器结构 ................................................................................................................................... 26 4.2 同步器工作原理 ........................................................................................................................... 27 4.3 同步器主要尺寸确定 ................................................................................................................... 28 4.4 同步器主要参数确定 ................................................................................................................... 30 5 变速器的润滑和密封 ............................................................................................................................... 32 5.1 润滑 ............................................................................................................................................... 32 5.2 密封 ............................................................................................................................................... 32 结论 ............................................................................................................................................................... 33 谢辞 ............................................................................................................................................................... 34 参考文献 ....................................................................................................................................................... 35