4座微型客货两用车设计（车架、制动系设计）
摘要
汽车制动系是保证汽车及驾驶者生命安全的重要部分，制动系是使行进中的汽车减慢速度或者停止运动。
这次我的毕业设计题目是4座微型客车设计（车架、制动系设计）。在第二章我主要介绍了制动系的概况和设计时应满足的基本要求。第三章主要是制动系的类型及最后确定的方案，其中列出了几种可供选择的类型并进行了分析、比较最后确定的方案如下：行车制动器：前鼓后鼓，前鼓式制动器为双领蹄式制动器，后鼓式制动器为领从蹄式制动器。第五章主要介绍了制动系主要结构参数的选择并进行了简单的计算，是本设计说明书的核心部分，其中包括鼓式制动器主要结构参数的选择，例如：制动鼓内径、摩擦衬片宽度和包角、摩擦衬片起始角，同时对制动力和制动力矩分配系数进行了计算。第四章主要对驻车制动和应急制动进行了简单的计算。第五章介绍的是制动器主要零件的结构设计，如制动鼓、制动蹄、制动底板和制动轮缸等。第七章包括制动驱动机构的选择和计算，制动管路的分路系统和液压驱动机构的设计和计算。第八章列出了车架的几种类型，分析比较之后，最后确定选用前窄后宽的边梁式车架，并且在这一章中对车架的弯曲强度进行了计算，对车架的刚度进行了校核。
通过这一系列的分析、计算、校核等，这套设计方案是可行的。
关键词：制动系统，鼓式制动器，应急制动，车架 

THE DESIGN OF 4SEATS MINI DUAL-USE CAR  (THE DESIGN OF FRAME AND BRAKE SYSTEM)

ABSTRACT

The brake system is an important part to keep safety for automobile, the purpose of the braking system is to slow down and stop the moving automobile.
My topic in this graduation design is the design of frame and the brake system.In second chapter we mainly introduced something about the brake system and some requests which the brake system should satisfied. The third chapter mainly introduced the type of the brake system and finally determined the plan, in this chapter we listed several kinds to choose, at last we determined the plan through analysis and compare with as follows: In traveling brake system, the former wheels and the rear wheels are drum brake. The drum type brake for collar from foot brake. The fourth chapter mainly introduced the main design parameter’s choice and has carried on the simple computation, and this chapter is the most important part. Including drum type main design parameter choice, For example: The brake drum inside diameter, the width, the angle and the outset angle and so on, simultaneously have carried on the computation to the brake strength and the braking moment distribution coefficient. The fifth chapter mainly said the vehicle to brake on stopping and momentary through simple computation. The brake major parts structural design, like brake drum and brake wheel cylinder and so on were designed in the sixth chapter. Seventh chapter including applies the brake the driving mechanism choice and the computation, the brake line by-pass system and the hydraulic pressure driving mechanism design and the computation. Eighth chapter has listed the frame several kind of types, after the analysis comparison, after finally front determined selects the narrow width side beam plate frame, And has carried on the computation in this chapter to the frame bending strength, has carried on the examination to the frame rigidity.
 Through this a series of analysis, computation, examination and so on, this set of design proposal is feasible
KEY WORDS: brake system, drum brake，emergency brake, frame

常用符号表
—制动器因数
—汽车承受的总地面制动力，N
—汽车制动器制动力，N
—轮胎与地面间的附着力，N
—制动器摩擦副的摩擦系数
—汽车重力，N
—重力加速度,m/s²
—汽车质心高度,mm
—制动减速度, m/s²
—汽车轴距,mm
—汽车总重量,kg
—制动蹄摩擦片与鼓之间的法向力,N
—制动蹄的张开力,N
—车轮有效半径,mm
—制动器对车轮的制动力矩,N/m
—汽车行驶速度,m/s
—地面对车轮的法向力,N
—汽车制动器制动力分配系数
—轮胎与地面间的附着系数
—同步附着系数