EQ五吨货车三轴式五档变速器设计

论文编号:JX1535  论文字数:13865.页数:49  附任务书，开题报告，外文翻译，CAD图，答辩PPT

EQ五吨货车三轴式五档变速器设计

【摘要】本设计的任务是设计一台用于货车上手动变速器。本设计采用中间轴式变速器，该变速器具有两个突出的优点：一是其直接档的传动效率高，磨损及噪声也最小；二是在齿轮中心距较小的情况下仍然可以获得较大的一档传动比。                 
根据货车的外形、轮距、轴距、最小离地间隙、最小转弯半径、车辆重量、满载重量以及最高车速等参数结合自己选择的适合于该货车的发动机型号可以得出发动机的最大功率、最大扭矩、排量等重要的参数。再结合某些货车的基本参数，选择适当的主减速比。根据上述参数，再结合汽车设计、汽车理论、机械设计等相关知识，计算出相关的变速器参数并论证设计的合理性。
它功用是：改变传动比，扩大驱动轮转矩和转速的变化范围，以适应经常变化的行驶条件，如起步、加速、上坡等，同时使发动机在有利的工况下工作；在发动机旋转方向不变的前提下，使汽车能倒退行驶；利用空档，中断动力传递，以使发动机能够起动、怠速，并便于发动机换档或进行动力输出。这台变速器具有五个前进档（包括一个超速档五档）和一个倒档，并通过锁环式同步器来实现换档。

【关键词】变速器；锁环式同步器；传动比；中间轴

EQ five tons van triaxial type five gear transmission design
 
[Abstract] The duty of this design is to design a manual transmission used in the saloon, It’s the countershaft-type transmission gearbox. This transmission has two prominent merits: Firstly, the transmission efficiency of the direct drive keeps off high, the attrition and the noise are also slightest; Secondly, it’s allowed to obtain in the biger gear ratio of the first gear when the center distance is smaller.
 According to the contour, track，wheel base，the smallest ground clearance, the smallest turning radium, the vehicles weight, the all-up weight as well as the highest speed and so on, union the choosing engine model we can obtain the important parameters of the max power, the max torque, the displacement and so on. According to the basic parameters of the certain saloon, choose the suitable final drive ratio. According to the above parameters, combining the knowledge of automobile design, automobile theory, machine design and so on, calculate the correlated parameters of the gearbox and proof the rationality of the design.
 Its function is: Changing gear ratio, expanding the torque of the driving wheel and the range of the rotational speed, to adapt the travel condition which frequently changes, like start, acceleration, climbing and so on, simultaneously causes the engine to work under the advantageous operating mode; Under the premise of the invariable rotation, enables the automobile to travel back; Using neutral, severances the power transmission, to make the engine start, idle, and is advantageous for the engine to shift gears or to carry on the dynamic output. This gearbox has five (including over drive—fifth gear) and a reverse gear, and through the inertial type of synchronizer to realize shift gears.
 
 [Keywords] transmission; inertial type of synchronizer; gear ratio; countershaft

目   录

毕业设计（论文）任务书 Ⅰ
开题报告 Ⅱ
指导教师审查意见 Ⅲ
评阅老师评语 Ⅳ
答辩会议记录 Ⅴ
中文摘要 Ⅵ
外文摘要 Ⅶ
1 前言 1
1.1 手动变速器（MT） 2
2 变速器的构造 4
2.1 传动示意图 4
2.2 主要结构说明 4
3 设计参数 7
3.1 传递功率或扭矩 7
3.2 初定各档传动比 7
4 变速器的主要参数 8
4.1 中心距A的初算与确定 8
4.2 变速器的总体轴向尺寸的初算与确定 8
4.3 齿轮参数（模数，齿数，压力角等）的初算与确定 8
5 各档齿轮的几何尺寸计算 13
5.1 输入轴与中间轴常啮合齿轮 13
5.2 一档齿轮 14
5.3 二档齿轮 16
5.4 三档齿轮 18
5.5 四档齿轮 19
5.6 倒档齿轮 21
5.7 倒档中间齿轮 22
6 各档齿轮的强度计算 24
6.1第一档齿轮强度计算 24
6.2 第二档齿轮强度计算 26
6.3 第三档齿轮强度计算 29
6.4 第四档齿轮强度计算 31
7 轴的设计及强度计算 35
7.1 输出轴的设计及强度计算 35
7.2 中间轴的设计及强度计算 37
7.3 入轴的设计及强度计算 39
8 滚动轴承的寿命计算 42
8.1输出轴轴承寿命计算（以一档为例） 42
8.2中间轴承寿命计算（以一档为例） 43
8.3输入轴轴承寿命计算（以一档为例） 44
参考文献 46
致    谢 47

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