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摘要

With the increasing awareness of energy crisis and environmental protection,  people pay more attention to pure electric vehicles. Some potential traditional automobile manufacturers at home and abroad often position their products in a high level, so it is difficult to popularize them among majority consumers. As a supplement to middle and high level pure electric vehicles, small and micro pure electric vehicles   will reveal a great development potential. This kind of pure electric vehicle has the advantages of compact structure, light weight and low cost.

In this paper, the driving axle of an unmanned electric logistics vehicle based on XinShiQi Company is designed with the help of three-dimensional modeling software CATIA, and finite element analysis software ANSYS. In the design, the characteristics of the drive axle are explained firstly. According to the given data, the structure types and parameters of the final drive, differential, half shaft and universal joint are determined, and the strength is checked. Through calculating the size and referring to the similar parts of the existing vehicle, carry out the 3D model. Then import the model into finite element analysis software to obtain stress nephogram. The results are of great significance to the design and development of the driving axle of the electric logistics vehicle.

Key words: drive axle; electric logistics vehicle; final drive; differential

Contents

Chapter 1 Introduction    1

1.1 The purpose and significance of the research    1

1.2 Overview of research status in China and abroad    2

Chapter 2 Drive axle design    4

2.1 Drive axle type selection    5

2.2 Final drive design    6

2.2.1 Final drive structure technical solution    6

2.2.2 Final drive gear design    8

2.2.3 Strength check of shaft and key    15

2.3 Differential design    20

2.3.1 Main parameters selection of differential gear    20

2.3.2 The material of the differential gear    23

2.3.3 Differential gear geometry calculation    24

2.3.4 Differential gear strength calculation    25

2.4 Half shaft design    26

2.5 Universal joint design    28

2.5.1 Universal joint selection    28

2.5.2 Universal joint size selection    29

Chapter 3 CATIA 3D modeling    31

3.1 Software Introduction    31

3.2 Final drive modeling    31

3.3 Differential Modeling    32

3.4 Drive half shaft modeling    33

3.5 Axle case modeling    34

3.6 Drive axle overall 3D model    34

Chapter 4 ANSYS finite element analysis    36

4.1 Material Settings    36

4.2 Contact and grid settings    36

4.3 Constraints And Loading Settings    37

4.4 Analysis and comparison of results    37

4.5 Summary    39

Chapter 5 Conclusion    40

References    41

Acknowledgement    43

Appendix    44

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