!【详情如下】【优秀机械毕业设计全套word+CAD图纸】【需要咨询购买全套设计请加QQ97666224】.bat
PDF报告.pdf
任务书.doc
外文翻译.doc
开题报告.doc
文献综述.doc
设计说明书.doc
轿车变速器.ppt
中间轴.dwg
第一轴.dwg
第二轴.dwg
箱体.dwg
装配图.dwg
齿轮.dwg
摘 要
本次设计的目的是设计轿车上的中间轴式的手动变速装置，其优点有两个：一是在通过较小齿轮中心距获得较大的传动比；二是其传动效率较高，同时噪声也较小。
根据轿车的外形、轴距、轮距、最小转弯半径、最小离地间隙、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轿车的发动机型号便可以得出发动机的最大扭矩、最大功率、排量等重要参数。再根据一些轿车的基本参数，选择出合适的主减速比。再根据机械设计制造及其自动化的相关知识，计算出变速器的各项参数并校验设计的可行性。
这款变速器的主要功能包括：其一是改变传动比，以适应不断变化的行驶条件，同时使发动机始终正常合理的工作；其次是能够在发动机旋转方向不变的同时还能让汽车倒车；最后是利用空档来阻断动力的传递，使发动机能够完成起动、怠速、换档、进行动力的输出。这台变速器公有五个前进档和一个倒车档，并通过同步器来实现换档。
关键词：变速器; 传动比; 同步器; 第二轴; 中间轴
ABSTRACT
The duty of this design is to design a FR type 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:①Changing 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;②Under the premise of the invariable rotation, enables the automobile to travel back;③Using 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.
Key wordS：transmission; inertial type of synchronizer,gear ratio; countershaft,second axis; gear。
目 录
绪论1
1机械式变速器的概述及其方案的确定2
1.1变速器的功用和要求2
1.2变速器结构方案的确定2
1.2.1变速器传动机构的结构分析与型式选择2
1.2.2倒档传动方案4
1.3变速器主要零件结构的方案分析4
1.3.1齿轮型式4
1.3.2换档结构型式4
1.3.3同步器的选择5
2 变速器主要参数的选择与零件的设计5
2.1 变速器主要参数的选择5
2.1.1档数和传动比5
2.1,2中心距7
2.1.3轴向尺寸7
2.1,4齿轮参数7
2.2各档传动比及其齿轮齿数的确定9
2.2.1确定一档齿轮的齿数9
2.2.2确定常啮合齿轮副的齿数10
2.2.3确定其他档位的齿数10
2.2.4确定倒档齿轮的齿数11
2.3 齿轮变位系数的选择11
3 变速器齿轮的强度计算与材料的选择12
3.1 齿轮的损坏原因及形式12
3.2 齿轮的强度计算与校核12
3.2.1齿轮弯曲强度计算12
3.2.2齿轮接触应力14
4 变速器轴的强度计算与校核15
4.1变速器轴的结构和尺寸15
4.1.1轴的结构15
4.1,2确定轴的尺寸16
4.2轴的校核16
4.2.1第一轴的强度与刚度校核17
4.2.2第二轴的校核计算18
5 变速器同步器的设计20
5.1同步器的结构20
5.2同步环主要参数的确定21
6 变速器的操纵机构23
结论24
致 谢25
参考文献26
川公网安备: 51019002004831号