HLJIT7-1000重型货车三轴式七档手动变速设计

(104页)

'HLJIT7-1000重型货车三轴式七档手动变速设计'
变速器用来改变发动机传到驱动轮上的转矩和转速,是汽车总成部件屮的重要组 成部分,是主要的传动系统。变速器的结构要求对汽车的动力性、燃料经济性、换档 操纵的可靠性与轻便性、传动平稳性与效率等都有直接的影响。三轴式变速器由于具有体积小、原理简单、工作可靠、操纵方便等优点,故在大 多数汽车屮广泛应用。本文设计研究了三轴式五档手动变速器,其口的主要是基于对 机械原理、机械设计、AutoCAD等知识的熟练运用和掌握,同时运用汽车构造、汽车 设计、材料力学、互换性测量等学科知识,对三轴式变速器的各部件进行设计,并利 用AutoCAD软件绘制装配图和零件图等六项内容。首先,本文将概述变速器的现状 和发展趋势,介绍变速器领域的最新发展状况。其次,对工作原理做了阐述,对不同 的变速器传动方案进行比较,选择合理的结构方案进行设计。再次,对变速器的各档 齿轮和轴以及轴承做了详细的设计计算,并进行了受力分析、强度和刚度校核计算, 并为为这些元件选择合适的工程材料及热处理方法。对一些标准件进行了选型以及变 速器的传动方案设计。简单讲述了变速器屮各部件材料的选择。最后,本文将对变速 器换档过程中的重要部件一同步器以及操纵机构进行阐述,讲述同步器的类型、工作 原理、选择方法以及重要参数。关键词:变速器;传动比;轴;齿轮;设计计算;校核ABSTRACTTransmission to change the engine reached on the driving wheel torque and speed, Automotive transmission parts in the automobile assembly of an important part of the main drive system. Transmission of the power structure of the vehicle, economy, manipulation of the reliability and portability, the smooth drive and have a direct impact on efficiency.Three-shaft transmission is widely used most vehicle for its particular advantages 5such as small dimension ,simply theory .good stability, conveniently operation .This design study of the three-axis 5-speed manual transmission, the purpose is based on the skillful of using mechanic theory .mechanic design, AutoCAD. Meanwhile, my paper is incorporated structure of vehicle, design of vehicle, mechanic of materials, and survey of interchangeability. I will design the parts of thrcc-shaft transmission, and using Auto CAD software, drawing assembly drawings and parts diagrams of five elements. At the same time the use of vehicle construction, automotive design, material mechanics, interchangeability of measurement knowledge of the subjects on the thrcc-axis gearbox design file 12.At first, I will give a summary of the current situation and the tendency of development of the vehicle transmission, and introduce the latest development state in the field of the transmission.The second, I will compare the transmitting scheme of different transmission, and choose a better structure scheme.Next, I will do some mechanic analyses, strength, stiffness check of the shafts and gears, which are the important parts of the transmission, and choose appropriate materials and heat treatment.At last, I will introduce the operation mechanism and the synchronizer, which plays an important role in changing gear? I will give an account of the type, operation, design procedure and major parameter of the synchronizer.Key words: Transmission; Transmission Ratio; Shaft; Gear; Design and Calculation;Checking摘要 IAbstract 11第1章绪论 11.1汽车变速器的概述 11.2汽车变速器研究状况、发展趋势及成果 11.2.1研究现状 11.2.2设计目的意义 21.2.3汽车变速器发展趋势 21.3汽车变速器的设计方法和研究内容 31.3. 1变速器设计的主要内容 3第2章变速器传动机构布置方案 52.1变速器的选择 52. 1. 1结构工艺性 52.1.2变速器的径向尺寸 52. 1.3变速器齿轮的寿命 52. 1.4变速器的传动效率 52. 2倒挡布置方案 52.3零、部件结构方案分析 62. 3. 1齿轮形式 62. 3. 2换挡机构形式 72.3.3自动脱挡 72. 4本章小结 8第3章变速器主要参数的选择 93?1概述 93. 2挡数 93. 3传动比范围 93. 4变速器各档传动比的确定 93. 5中心距A 113. 6变速器的齿轮参数的确定 123. 6. 1齿轮模数
关 键 词:
HLJIT7 1000 重型 货车 三轴式七档 手动 变速 设计
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