摘要 目前，自动变速器在汽车领域的应用越来越广泛。其中主要原因是自动变速器能够根据路面状况自动改变车速，这极大地方便了驾驶者。不仅能够缓解驾驶者驾驶疲劳减少路面交通事故，而且还能够提高汽车的燃油经济性。同时，还能提高汽车的动力性。行星齿轮变速箱主要结构为行星齿轮机构，行星齿轮机构主要由太阳轮、外齿圈、行星轮、行星架组成。由于行星齿轮机构具有两个自由度，因此行星齿轮机构没有固定的的传动比，不能直接应用于变速器。为了能够将行星齿轮变速器应用于自动变速器，必须将齿轮机构中的元件固定使其具有一个自由度。只有一个自由度的行星齿轮机构具有固定的传动比，因此可以应用于自动变速器中。我设计的为商务车行星齿轮变速箱，行星齿轮机构具有结构紧凑、刚度大、传动平稳等优点。行星齿轮变速箱动力改变由液力变矩器进行控制，其操纵机构为离合器和制动器，并通过液压油进行控制，从而实现自动换挡。但是，自动变速器结构比较复杂。通过这次设计我对自动变速器原理做了大量的工作并参考商务车车型最终确定了其传动方案，并对各档传动比做了详细的说明。 关键词：自动变速器行星齿轮变速箱液力变矩器 Abstract At prese
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nverter 目录 摘要Ⅰ AbstractⅡ 第1章自动变速器的基本组成1 第2章行星齿轮和液力变矩器的工作原理4 2.1行星齿轮的结构及工作原理4 2.2液力变矩器的工作原理5 第3章自动变速器传动方案及传动原理6 3.1自动变速器的传动方案6 3.2自动变速器的传动原理6 3.2.1空挡或驻车挡的传动原理6 3.2.2D位D1挡汽车加速与滑行时传动原理7 3.2.3汽车在L位一挡时前后行星排的传动原理10 3.2.4D位D2挡传动原理图13 3.2.5二挡时自动变速器的传动原理图16 3.2.6D位D3挡时，自动变速器的传动原理18 3.2.7超速挡传动原理19 3.2.8自动变速器的倒档传动原理21 第4章行星齿轮机构设计及计算…………………………………………..23 4.1变速器齿轮传动的设计及计算23 4.1.1各挡位传动比分析23 4.1.2齿轮参数设计及计算23 4.1.3实际传动比25 4.1.4齿轮强度校核25 4.2换挡执行机构26 4.2.1多片离合器27 4.2.2制动器27 4.2.3单向超越离合器28 第五章结论29 致谢30 参考文献31