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摘要

Disc brakes are the object of this design, referring to the Smart for 4 model select parameters. In the part of the design of the braking system,designing and calculating the brake system at first,and the material, structure and size of the brake system parts were selected. The checking calculation of wear, temperature and parking was carried out.After that, the parking brake is designed and checked, and then the brake drive mechanism was selected and related calculations were carried out. After that is checking the braking performance, and then the brake force distribution curve and the brake force distribution coefficient curve of the front and rear wheel brakes are plotted according to the data obtained before by using MATLAB.In addition to software analysis, the three-dimensional models and assembly of the designed parts are first designed by CATIA. After that, the static analysis, modal analysis and thermal analysis of the model was carried out by ANSYS Workbench.

Key Words：blade electric vehicles; disc brake; MATLAB; CATIA;

ANSYS Workbench

Catalog

Chapter 1 Introduction    1

1.1 Foreword    1

1.2Research status of automobile brake system    1

1.3Research results of braking system for electric vehicle    2

1.4Overview of Braking System Form    4

1.5Design content    4

Chapter 2 Automobile Parameter and Brake System Layout    5

2.1Automobile parameter    5

2.1.1Selection of vehicle basic parameter    5

2.1.1Calculation of relative parameter    5

2.2 Overall layout of braking system    6

2.3 Selection of brake    7

2.3.1Classification of brakes    7

2.3.3Selection of brake type    8

2.4 Summary    9

Chapter 3 Calculation of Brake System    10

3.1 Theoretical calculation    10

3.1.1 Braking force and braking distribution coefficient    10

3.1.2Synchronous adhesion coefficient    11

3.1.3Braking strength and utilization ratio of adhesion coefficient    11

3.1.4Maximum braking torque of brake    12

3.1.5Brake coefficient    12

3.2 Brake related calculation    13

3.2.1Selection and size of basic parts of disc brake    13

3.2.2Calculation of wear characteristics of friction linings    15

3.2.3Calculation of heat capacity and temperature rise of brake    16

3.2.4Calculation of braking torque of disc brake    17

3.3 Parking brake calculation    18

3.3.1 Parking brake type selection    18

3.3.2Slope performance check    19

3.3.3 Maximum parking braking torque check    20

3.3.3 Brake handle tension check    20

3.3.5 Brake handle Stroke check    20

3.4Correlation calculation of brake drive mechanism    20

3.4.1Selection of brake actuating mechanism    20

3.4.2Selection of brake piping system    21

3.4.3Design and calculation of hydraulic brake actuating mechanism    21

3.5 Braking performance analysis    23

3.5.1 Braking efficiency    23

3.5.2Constancy of braking efficiency    23

3.5.4Analysis of brake force distribution curve    24

3.6 Summary    25

Chapter 4 Model Establishment and Analysis    27

4.1Establishment of brake system model    27

4.2Finite element analysis of braking plate    28

4.2.1Pre-processing    28

4.2.2Static Analysis    29

4.2.3Modal analysis    30

4.3 Finite element analysis of braking caliper    32

4.3.1Pre-processing    32

4.3.2Static Analysis    33

4.4 Summary    34

Chapter 5 Conclusion and Prospect    35

5.1 Conclusion    35

5.2 Expectation    35

Reference    36

Appendix    38

Thank    39

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