Graduation Design(Dissertation)of Wuhan University of Technology

Braking system design of Haval H6

School： International College

Speciality amp; Class： Auto gj1401class

Student name： Shao Jingtao

Tutor： Wang Zhou

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Abstract

With the progress of the times and the rapid development of the automotive industry, people's demand for automobiles is increasing. The ever-increasing speed of automobiles imposes higher requirements on the safety of automobiles. Among all vehicle performances, vehicle braking performance is a major factor affecting vehicle safety. Therefore, how to further improve the reliability of automobile braking systems becomes Important research questions.

This design is the design of Haval H6 braking system. The significance of the research is firstly discussed in this thesis. The research status of the braking system at home and abroad is introduced in detail. Then compare the advantages and disadvantages of drum brakes, disc brakes, and choose the type of brake. Then, according to the structural parameters of the selected model, the parameters of the main brake components are selected, and then the relevant parameters of the brake system, such as the synchronous adhesion coefficient, the distribution of the front and rear wheel braking torque, and the maximum braking torque of the front and rear wheels, are performed. Design calculations, and use MATLAB drawing function to draw the front and rear axle braking force distribution curve. Finally, the motion UG performs three-dimensional modeling of important components such as brake discs and brake calipers, and uses UG's assembly function to assemble the 3D components drawn, and then exports 2D engineering drawings, and modify details and dimensions in AutoCAD.

Key words: disk brake, UG, 3D modeling, MATLAB, AutoCAD.

Contents

Chapter 1 Introduction 1

1.1 Concept of braking system 1

1.2 Research Status of Braking System 1

1.3 Braking system design requirements 3

1.4 Research scheme 3

Chapter 2 Selection of braking system 5

2.1 Selection of front and rear brake structure 5

2.1.1 Brakes selection basis 5

2.1.2 Drum brake introduction 5

2.1.3 Disk brake introduction 9

2.1.4 Comparison of drum brake and disk brake 10

2.1.5 Final choice of Haval H6 11

2.2 Selection of Brake drive mechanism 11

2.2.1 Simple braking (manpower driven) 11

2.2.2 Power drive mechanism 12

2.2.3 Servo brake 13

2.3 Selection of hydraulic circuit 14

Chapter 3 The main parameters of the brake and its selection 16

3.1 Main parameter values of braking system 16

3.1.1 Related main parameters 16

3.1.2 Analysis of synchronous adhesion coefficient 16

3.1.3 Surface normal reaction force of front and rear wheels 17

3.2 Calculation of brakes 18

3.2.1 Determine the front and rear braking torque distribution coefficients 18

3.2.2 Determination of brake braking torque 19

3.2.3 Determine main parameters of disk brake 19

3.2.4 Calculation of braking force of disc brake 21

3.3 Parking brake calculation 22

3.4 Wear characteristics of friction pads 24

3.4.1 Specific energy dissipation rate 24

3.4.2 Specific friction 25

3.5 Distribution of the front and rear braking force 26

Chapter 4 Design and calculation of hydraulic brake drive mechanism 28

4.1 Braking wheel cylinder diameter 28

4.2 Single wheel cylinder work volume 28

4.3 Work volume of brake master cylinder 29

4.4 Diameter of brake master cylinder 30

4.5 Brake pedal force 30

4.6 Pedal travel 30

Chapter 5 CAE Modeling and Finite Element Analysis of Brake 31

5.1 3D modeling 31

5.1.1 3D modeling of main brake components 31

5.1.2 3D modeling of other parts 32

5.1.3 3D assembly model 33

5.2 2D engineering drawing 33

5.3 Finite element analysis 34