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汽车底盘制动系统设计.docx
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轻型汽车底盘鼓式制动器设计
DESIGN OF DRUM BRAKE FOR
LIGHT VEHICLE CHASSIS
2009 年 6 月
西南交通大学本科毕业设计 第 I 页
摘 要
汽车作为陆地上的现代重要交通工具,由许多保证其性能的大部件,即所谓“总
成”组成,制动系就是其中一个重要的总成,它直接影响汽车的安全性。随着高速公
路的快速发展和车流密度的日益增大,交通事故也不断增加。据有关资料介绍,在由
于车辆本身的问题而造成的交通事故中,制动系统故障引起的事故为总数的 45%。可
见,制动系统是保证行车安全的极为重要的一个系统。此外,制动系统的好坏还直接
影响车辆的平均车速和车辆的运输效率,也就是保证运输经济效益的重要因素。制动
系既可以使行驶中的汽车减速,又可保证停车后的汽车能驻留原地不动。由此可见,
汽车制动系对于汽车行驶的安全性,停车的可靠性和运输经济效益起着重要的保证作
用。
当今,随着高速公路网的不断扩展、汽车车速的提高以及车流密度的增大,对汽
车制动系的工作可靠性要求显得日益重要。只有制动性能良好和制动系工作可靠的汽
车才能充分发挥出其高速行驶的动力性能并保证行驶的安全性。由此可见,制动系是
汽车非常重要的组成部分,从而对汽车制动系的机构分析与设计计算也就显得非常重
要了。
论文中采用的是前鼓后鼓的制动系方案并且前轮采用双领蹄式制动器,后轮采用
领从蹄式制动器,兼顾了制动器效能因数和制动器效能的稳定性。它的工作原理是利
用与车身(或车架)相连的非旋转元件和与车轮(或传动轴)相连的旋转元件之间的相互
摩擦来阻止车轮的转动或转动的趋势,亦即由制动踏板的踏板力通过推杆和主缸活塞,
使主缸油液在一定压力下流入轮缸,并通过两轮缸活塞推使制动蹄绕支承销转动,上
端向两边分开而以其摩擦片压紧在制动鼓的内圆面上。不转的制动蹄对旋转制动鼓产
生摩擦力矩,从而产生制动力,使车轮减速直至停车。
论文第一章介绍了汽车制动系发展情况和制动系统的意义。第二章主要讲述了汽
车的总体设计。第三章讲述了鼓式制动系的主要形式及其方案的选取。第四章分析计
算了制动器制动过程中动力学参数的计算。第五章讲述了鼓式制动器的结构参数和主
要零部件的设计。第六章是关于鼓式制动器的设计计算。第七章是制动器驱动机构的
设计与计算。第八章是鼓式制动器主要零部件的强度分析。
关键词:鼓式制动器 驱动机构 制动参数
西南交通大学本科毕业设计 第 II 页
Abstract
As an important modern land-based transport, Automotive components from many
large parts ,namely, the so-called "assembly" which ensure the performance of automotive,
and braking system which directly affects the safety of motor vehicles is one of the most
important assembly. With the rapid development of highways and increased traffic density,
traffic accidents are also increasing. According to the information on the vehicle itself as a
result of problems caused by traffic accidents, the brake system failure caused the accident
accounting for the total number of 45%. So braking system is an extremely important
system to ensure traffic safety. In addition, the braking system has a direct impact on the
quality of the average vehicle speed and vehicle transportation efficiency, that is, an
important factor ensuring cost-effective transport. It not only can slow down a moving
vehicle, but also to ensure that the car can be fixed in situ after parking. This shows that the
vehicle braking system plays an important role in traffic safety, the reliability of parking,
and transport economic efficiency.
Today, with ever-expanding highway network, the improvement of vehicle speed and
traffic density, on the work of automotive braking system reliability requirements become
increasingly important. Only vehicles which have good braking performance and reliable
braking system can give full play to their high-speed dynamic performance and to ensure
the safety of traveling. This shows that the braking system is a very important component
of the vehicle, thus it’s very important to the analysis and design of brake system bodies.
Paper used brake program of the brake drum in front and behind. Front wheel used
duo-duplex drum brakes and behind wheel simplex drum brakes, which takes into account
the effectiveness of the brakes and brake performance factor of stability. Its working
principle is to use with the body (or frame) associated with non-rotating components and
the wheel (or shaft) connected to the rotating components of friction between the wheels to
prevent the trend of turning or rotating, namely by the pedal force of brake pedal passing
through the push rod and the master cylinder piston, making master cylinder oil inflow
wheel cylinder under a certain pressure, and pushing through the two-cylinder piston brake
shoe so that rotating around the branch managers, the top separately to both sides pressed
in its friction plate brake drum surface of the inner circle. Non-rotating brake shoe
produced friction torque to rotating drum brake resulting in braking force to slow down
until the wheels stop.
The first chapter of this paper describes the development of automotive braking
system. Chapter II focuses on the overall design of the car. Chapter III is about the main
西南交通大学本科毕业设计 第 III 页
form and program selection of the drum brake. Chapter IV is about analysis and calculation
of kinetic parameters of the brake during braking process. Chapter V described the
structure of drum brake components and the design of the main parameters. Chapter VI
described design and calculation of drum brake. Chapter VII is about the analysis and
calculation of drum brake drive mechanism. Chapter VIII is about strength checking on the
main components of drum brake.
Key words: Drum brake Drive mechanism Brake Parameters
西南交通大学本科毕业设计 第 IV 页
目录
第 1 章 绪论.............................................................1
1.1 汽车制动系统的发展概况...........................................1
1.1.1 汽车制动系统的组成 .........................................1
1.1.2 电制动的优缺点和存在的问题 .................................3
1.2 研究制动系统的意义...............................................4
1.3 对汽车制动系的展望...............................................4
第 2 章 汽车总体参数的选择及计算........................................8
2.1 总体设计应满足的基本要求 ........................................8
2.2 汽车形式的确定...................................................9
2.3 汽车质量参数的确定..............................................10
2.4 汽车主要尺寸的确定..............................................11
2.5 汽车性能参数的确定..............................................13
2.6 发动机的选择....................................................14
2.7 轮胎的选择......................................................18
第 3 章 鼓式制动器的方案选择...........................................21
3.1 鼓式制动器的结构形式 ...........................................21
3.1.1 领从蹄式制动器 ............................................22
3.1.2 单向双领蹄式制动器 ........................................25
3.1.3 双向双领蹄式制动器 ........................................26
3.1.4 双从蹄式制动器 ............................................27
3.1.5 单向增力式制动器 ..........................................27
3.16 双向增力式制动器 ...........................................28
3.2 鼓式制动器方案的确定............................................29
3.2.1 制动效能因素 ..............................................29
3.2.2 本设计中鼓式制动器方案的优选 ..............................30
第 4 章 制动过程的动力学参数的计算.....................................31
4.1 制动过程车轮所受的制动力........................................31
4.2 制动距离与制动减速度计算........................................37
4.3 同步附着系数与附着系数利用率计算................................38
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