武汉理工大学毕业设计（论文）

经济型轿车手制动臂总成设计

学院（系）： 国际教育学院

专业班级： 车辆gj1601

学生姓名： 罗一楠

指导教师： 邓小禾

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ABSTRACT

With the development of society, cars as daily means of transportation have become an indispensable part of our life. People's safety, handling stability, power, economy and comfort put forward higher requirements. It is difficult to improve or improve the performance of the vehicle by using traditional mechanical methods. The purpose of the parking brake system is to provide resistance to the vehicle when there is an external force on the slope. Usually, the parking brake system stops the vehicle in place by locking the drive shaft or rear wheels.

parking brake is a device that prevents the vehicle from sliding when it is parked on the road surface (including slopes), prevents the vehicle from sliding and starts on the ramp. Parking brake devices are different from braking devices, and each has an independent control device. This paper mainly designs the manual parking brake device, and carries out three-dimensional modeling of the manual parking brake device through CATIA software, and makes static mechanical analysis on some parts of the hand part using ANSYS. Brake arm assembly.

Keywords: brake system; hand brake assembly; control force; structure design; optimization analysis

Listings

1 Introduction 1

1.1 Research Background 1

1.2 Research Status at Home and Abroad 2

1.3 The Purpose and Significance of Research 3

1.4 Contents of the Research Subject 4

2 Determination of Overall Plan for Hand Brake 5

2.1 Composition of Handbrake 5

2.2 Functions of Main Parts of Hand Brake 6

2.3 Function of Manual Parking Brake 7

2.4 Working Principle of Hand Brake 8

2.5 Design Requirements of Manual Parking Brake System 8

3 Parking Brake System Verification 10

3.1 Brief Introduction of Force on Hand Brake 10

3.2 Downhill Parking Capacity 10

3.3 Uphill Parking Capacity 12

3.4 Relationship Between Braking Force and Control Force 14

3.5 Check of Brake Handle Tension 16

4 Design, Calculation and Verification of Parameters of Hand Brake Arm Assembly 19

4.1 Factors Determining the Size of Hand Brake Arm Assembly 19

4.2 Design, Calculation and Verification of Manual Brake Arm Assembly Parameters 19

4.2.1 Design, Calculation and Check of Lever Ratio of Hand Brake Arm 19

4.2.2 Design, Calculation and Check of Working Stroke of Hand Brake Arm 20

4.2.3 Dimension Design of Lever of Hand Brake Arm Assembly 21

4.2.4 Calculation of Tooth Angle of Gear Plate of Hand Brake Arm Assembly 22

5 Modeling of Hand Brake Arm Assembly 23

5.1 Model Simplification and Geometric Model Establishment 23

5.2 Grid Division 24

5.3 Material Setting 25

5.4 Load and Constraint Setting 26

5.5 Summary of This Chapter 29

6 Hand Brake Arm Assembly Finite Element Analysis and Optimization 30

6.1 Analysis on Simulation Results of Hand Brake Arm Assembly under Different Working Conditions 30

6.1.1 Median Stretching Condition 30

6.1.2 High Stretching Condition 31

6.1.3 Low Stretching Condition 32

6.2 Structural Optimization of Hand Brake Arm Assembly 34

6.3 Summary of This Chapter 35

7 Verification of Optimized Scheme for Hand Brake Arm Assembly 36

7.1 Analysis on Simulation Results of Different Working Conditions after Optimization of Hand Brake Arm Assembly 36

7.1.1 Mid-position Stretching Condition Analysis 36

7.1.2 High-position Stretching Condition Analysis 37

7.1.3 Low-position Stretching Condition Analysis 39

7.2 Comparison of Static Mechanical Simulation Results Before and After Optimization 40

8 Conclusion 41

Reference 42

Acknowledgements 44

Appendix 45

1Introduction

1.1Research Background

In recent years, with the rapid development of the automobile industry and the increasingly serious crisis of resources and energy, the severe situation and the rapid growth of automobile design have put forward higher requirements for various requirements and functions of automobiles. With the rapid development of China's automobile industry, with the support of various national policies, the society's demand for economical cars is increasing day by day, giving consideration to safety and economy has become an important topic.

Hand brake assembly is an important operating component of automobile brake system. Whether it can work normally and stably is directly related to the driving safety of the car. With the rapid development of automobile technology, electronic handbrake is increasingly widely used in medium and high-grade cars. Electronic handbrake has the advantages of less occupied space and less strength, but it also has the disadvantages of inconvenient maintenance and reliance on electronic systems. However, the manual parking brake uses a mechanical transmission device, which occupies a large space on the vehicle. Moreover, the service life of mechanical parts is limited, and parts can easily reach the fatigue limit and fail. However, the traditional manual parking brake has the advantages of mechanical transmission device, i.e. reliable operation, long service life and good economy, and will not affect the work even when the vehicle is short of electric power. Therefore, it is necessary to install the hand brake arm in economical cars.

According to the working characteristics of the hand brake arm assembly and the existing problems of the hand brake arm, it is of great significance to optimize the structure and design a more reasonable and higher safety economic car hand brake arm.