乘用车机械式变速器设计

关键词：变速器;齿轮;同步器;设计
ABSTRACT
The transmission is been used to transform an engine to spread to drive the torque and the revolving speed on the wheel, the purpose is an earth to start and climb various condition that drove works, such as ascent, turn and acceleration...etc. at first down,make different travtive force of autocar acquisition and velocity, make the engine work in the most beneficial work condition range at the same time. Mechanical transmission is a traditional manual transmission car, because of its simple structure, small size, low manufacturing cost, ease of assembly and repair, high transmission efficiency, are still in use. Transmission performance of the vehicle directly reflects the level of performance, especially fuel economy is good or bad. Therefore, the design of transmission quality has been the focus of competition in the automotive industry. Along with the development of the automobile industry ,the trend of car transmission designing is to increase it stransmission power and decrese its weight ,and hope have smaller size and excellent performance. In conditions that knowing the engine output torque , speed of engine and maximum speed of vehicles , maximum degree , focus on the designing of transmission gear structural parameters , axis geometry design computation ; as well as the transmission and drive program structure design
Key words :Transmission ;Gear ; Synchrotron ;Design
目 摘
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要 ............................. 错误！未定义书签。
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ABSTRACT ....................................
第一章 绪
论 ............................................. 5
摘
要
变速器用来改变发动机传到驱动轮上的转矩和转速，目的是在原地起步、爬坡、 转弯、加速等各种行驶工况下，使汽车获得不同的牵引力和速度，同时使发动机在最 有利的工况范围内工作。 机械式手动变速器是传统的汽车传动系统， 由于其结构简单、 体积小、制造成本低、便于装配和修理，传动效率高等优点，一直沿用至今。变速器 的性能直接体现出整车性能的高低，特别是燃油经济性的好坏。所以变速器的设计质 量的高低一直是汽车行业竞争的焦点。 随着汽车工业的发展,轿车变速器的设计趋势为增大变速器传递功率与重量之比, 并要求变速器具有较小的尺寸和良好性能。 在给定发动机输出转矩、 转速及最高车速、 最大爬坡度等条件下,着重对变速器齿轮的结构参数、轴的结构尺寸等进行设计计算。
1.1 选题的目的和意义 ................................................ 5 1.2 变速器发展和国内外研究现状 ...................................... 5 1.3 变速器设计的要求 ................................................. 6 1.4 研究的基本内容 ................................................... 6
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第二章 变速器传动机构布置方案 ................................ 7
2.1 传动机构布置方案分析 ............................................. 7 2.1.1 两轴式和中间轴式变速器 ..................................... 7 2.1.2 多中间轴结构 ............................................... 8 2.1.3 倒挡的形式和布置方案 ....................................... 8 2.2 零、部件布置方案分析 ............................................. 9 2.2.1 齿轮形式 ................................................... 9 2.2.2 换挡的结构形式 ............................................. 9 2.2.3 防止自动脱档的措施 ........................................ 10 2.2.4 轴承形式 .................................................. 11 2.2.5 组合式变速器 .............................................. 11 2.3 本章小结 ........................................................ 11