机械5

摘要 变速器是改变改变汽车行驶过程中的速度的一个部件，可以改变发动机与驱动轮之间的关系，即改变了速度。目前的变速器种类多样，有自动和手动两种变速器，随着社会的发展，变速器更多的趋于自动，减少人为操作劳动，越来越方便人们的体验。 变速器的发展越来越快，越来越先进，让人们出行更加便捷。目前的汽车也更加细致的面对不同人来做出更加细致的改变。本文则是对拉维纳式的变速器做了简单的设计。从结构的分析，各个部件的作用，大致做了一些分析，以及加工选料也做了一定的分析和计算。 关键词：变速器自动变速器便捷 Abstract The tra
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nt 目录 摘要I Abstract II 第1章绪论1 1.1自动变速器的特点及分类1 1.2我国自动变速器的发展现状2 1.3设计目的3 1.4三速自动变速器齿轮变速系统的设计要求3 第2章拉维纳式齿轮结构设计4 2.1变速器齿轮机构图及工作原理4 2.11拉维纳自动变速器齿轮的机构4 2.12各执行元件的功能4 2.1.3拉维纳自动变速器换挡原理5 2.1.4变速器原理图5 2.1.5各档位工作情况分析表6 2.2拉维纳自动变速器的设计7 2.2.1拉维纳自动变速器设计参数7 2.2.2各档位传动比计算7 2.2.3最高车速的验算8 2.2.4齿轮齿数的确定8 第3章各齿轮元件参数确定及校核12 3.1齿轮材料的选择原则12 3.2行星齿轮各元件计算12 3.2.1齿圈受力及运算12 3.2.2小太阳轮受力及计算14 3.2.3大太阳轮受力及计算16 3.2.4行星轮受力及计算17 3.3离合器摩擦片的选择17 3.4小结18 第4章输入轴的强度校核及寿命分析19 4.1输入轴直径选择19 4.1.1轴的工艺要求及材料选择19 4.1.2轴径的初步估算19 4.2输入轴的强度校核19 4.3轴承的选择及寿命计算21 4.3.1轴承的选择21 4.3.2轴承寿命计算21 4.4小结22 结论23 致谢24 参考文献25 附录26