Graduation design of Wuhan University of Technology

Design of rear wheel disc brake for 1.6L domestic car

School: School of International Education

Specialty amp; Class:Automotive Engineering gj1604

Name: Ran Chongyin

Teacher： Yang Ying

Statement of Degree Thesis originality

I solemnly declare: the thesis submitted is the research result independently obtained by myself under the guidance of my tutor. Except for the contents specifically quoted in this thesis, this thesis does not include any other works that have been published or written by individuals or groups. I fully understand that the legal consequences of this statement are borne by me.

Author's Signature: Ran Chongyin

Date:

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Author's Signature: Ran Chongyin Date:

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Abstract

The braking system of the car is an important part of the car, excellent braking performance is of great significance to the safety of the car. A brake is a component of a braking system used to generate a force that hinders vehicle movement or trends. This article uses the CATIA software to design and model the rear wheel disc brake of a 1.6L family car, and through the ABAQUS to analysis the finite element analysis of the designed brake. This article mainly explains the structure of the brake, and then designs the parameters of the brake parts. First of all, a comprehensive summary and sorting of the car's braking system, analyze the structure, function and working principle of the braking system; secondly, according to the car theory and the knowledge of car design, the force analysis of the car when braking, derivation of the formula and theoretical analysis and calculation of the braking torque, synchronous adhesion coefficient, braking strength and maximum braking torque during the automobile braking process. Finally, according to the parameters of a specific car model, a reasonable rear wheel disc brake is designed, and the results of the most designed calculations are demonstrated to discuss the requirements and principles of matching brakes and vehicles.

Key words: Disc brakes; CATIA; Family car; ABAQUS

Contents

Abstract I

Chapter 1 Introduction 1

1.1Introduction 1

1.2Research status of automobile brakes at home and abroad 2

1.2.1Research state in China 2

1.2.2Research status abroad 3

1.3The main research content and significance of the paper 3

1.4Summary of chapter one 4

Chapter 2 Composition and Analysis of Household Car Brake 5

2.1Function of the brake 5

2.2Structural analysis and selection of brakes 5

2.2.1Drum brake 6

2.2.2Disc brakes 6

2.2.3The choice of brake structure 7

2.3Summary of chapter two 7

Chapter 3 design and calculation 8

3.1Performance requirements to be considered in brake design 8

3.2The determination of basic parameters 8

3.3Calculation of main parameters of braking system 9

3.3.1Braking force and braking force distribution coefficient 9

3.3.2Braking torque 12

3.3.3Synchronous adhesion coefficient 13

3.4Structural parameter design of disc brake parts 15

3.4.1Brake disc structure size 15

3.4.2Friction pad inner and outer radius 16

3.4.3Friction coefficient of friction plate 16

3.4.4Calculation of effective radius 17

3.4.5Working area of brake pad 17

3.4.6Friction pad wear characteristic calculation 17

3.5Summary of chapter three 18

Chapter 4 Finite Element Analysis of Braking System 19

4.1 Finite element analysis 19

4.2Application of finite element analysis in automobile design 20

4.3The finite element analysis process of the brake 20

4.4 Summary of chapter four 23

Chapter 5 The problem of brake matching with the whole vehicle 24

5.1Factors affecting the matching of the brake and the vehicle 24

5.1.1Structure of brake 24

5.1.2Impact of brake friction materials 24

5.1.3Effect of brake clearance 25

5.1.4Vehicle load distribution 25

5.2The principle of matching the brake design to the whole vehicle 25

5.3Summary of chapter five 25

Chapter 6 Conclusion 26

Reference 27

Thanks 28

Chapter 1 Introduction

1.1Introduction

In today's society, cars are an important tool for people to travel and transport. With the increase in the production of cars and the increasing speed of cars, road safety has become a global Sexual concerns. The number of deaths due to traffic accidents increases year by year. As can be seen in Figure 1.1, 78.8% of fatal accidents in the country in 2019 are caused by road traffic, the highest proportion. When the pace of life continues to accelerate, we should also pay attention to the safety of the car.

Fig.1.1The proportion of fatalities in various accidents across the country