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摘要

Contents

Abstract    III

1．Introduction    1

1.1 Basic concept of braking system    1

1.1.1 The composition of the braking system    1

1.1.2 Type of braking system    1

1.2  Research status of braking system    2

1.3 Main content of the project    4

1.4 Project research scheme    7

2．The choice of brake form    8

2.1 Introduction of drum brakes    8

2.2 Introduction of disc brakes    9

2.3 Selection of brake structures    10

3．Main parameters and selection of brake    11

3.1 Determination of main parameters of disc brake    11

3.1.1 Brake disc diameter D    11

3.1.2 Thickness of brake disc h    11

3.1.3 Inside and outside radius of friction linerR1,R2    12

3.1.4 Working area of brake liner A    12

4．Structural design of main parts of disc brake    13

4.1 brake disc    13

4.2 Brake caliper    13

4.3 Brake slipper    14

4.4 Friction material    15

5. Design and calculation of main parameters of brake    16

5.1 Determination of synchronous adhesion coefficient    18

5.2 Normal reaction of ground to front and rear wheels    19

5.3 Determination of the distribution coefficient β of braking force    20

5.4 Determination of braking moment for front and rear brakes    20

5.5 Braking torque required for emergency brake and parking brake    21

5.5.1 Emergency brake    21

5.5.2 Parking brake    21

5.5.3 Calculation of wear characteristics of linings    22

6.Structural form selection and design calculation of brake drive mechanism    24

6.1 Choice of structure form of braking drive mechanism    24

6.2 Multi-loop system for braking pipeline    26

6.3 Design and calculation of hydraulic braking drive mechanism    28

6.3.1 Determination of the diameter of the brake wheel cylinder    29

6.3.2 Determination of the diameter of the main brake cylinder    29

6.3.3 Braking pedal force and pedal stroke    30

6.3.4 Design and calculation of vacuum booster    31

7．Brake performance analysis    32

7.1 Braking performance Evaluation Index    32

7.2 braking efficiency    32

7.2.1 braking deceleration α    32

7.2.2 braking distance S    33

7.3 The constant braking performance    33

7.4 The direction stability of the vehicle during braking    33

7.5 Analysis of braking force distribution curve    34

Conclusion    36

Reference    37

Acknowledgements    38

Appendix A Brake 3D modeling    39

Appendix B Exploded view    45

Appendix C MATLAB programming    46

Appendix D EXCEL calculation    47

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