EQ1092F1型长头柴油载货汽车驱动桥设计

学院（系）： 国际教育学院

专业班级： 车辆gj1402班

学生姓名： 娄彦章

指导教师： 熊欣

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Abstract

Driving axle is in the end of transmission department of power, which is used to increase the torque that comes from gearbox, and distributes power reasonably. In addition, it bears vertical force, longitudinal force and lateral force from road surface and frame. Normally, driving axle consists of final drive, differential, half-shaft and axle housing.

There are two types of driving axle: disconnecting type and non-disconnecting.

For non-disconnecting type, its driving axle is connected with wheel through suspension. Since half-shaft collect and final drive are linked to be an integral part, it is impossible to find a relative motion between half-shaft and driving wheels in horizontal space. So this kind of driving axle is called non-disconnecting type, which is also called integral driving axle.

In order to increase automobile driving comfort and traffic ability, many cars use independent suspension nowadays, which means drive wheels of two sides use flexible suspension connected with frame respectively, so that two wheels may bounce independently. Corresponding with this, for disconnecting type, the shell of final drive is fixed on frame. The shell of driving axle is manufactured into sections and finally joined through hinges.

According to the truck type—Dongfeng EQ1092F1, this design will choose non-disconnecting type of driving axle, using single-class hypoid bevel gear final drive, symmetric planetary gear differential, full-floating half-shaft and integral driving housing.

Key Words：driving axle design；hypoid bevel gear；full-floating half-shaft；final drive

CONTENT

Chapter 1 Introduction

1.1 Purpose and Significance 1

1.2 Analysis of Research Status at Home and Abroad 1

Chapter 2 Analysis of Driving Axle Structure

2.1 Summarize 3

2.2 Structure of Driving Axle 3

Chapter 3 Final Drive Design

3.1 Structure of Final Drive 7

3.1.1 Type of Gear 7

3.1.2 Deceleration Form 7

3.1.3 Support Arrangement of Gears 7

3.2 Basic Parameter Design 8

3.2.1 Final Ratio 8

3.2.2 Load Calculation 9

3.2.3 Basic Parameters For Hypoid Gear 11

3.2.4 Geometric Dimensions of Hypoid Gear 15

3.2.5 Strength Check For Hypoid Gear 17

3.2.6 Material and Heat Treatment 20

Chapter 4 Differential Design

4.1 Principle of Symmetrical Bevel Gear Differential 21

4.2 Structure of Symmetrical Bevel Gear Differential 23

4.3 Symmetrical Bevel Gear Differential Design 23

4.3.1 Basic Parameter Design 23

4.3.2 Geometric Dimensions of Differential Gear 26

4.3.3 Strength Check For Differential Gear 29

Chapter 5 Half-shaft Design

5.1 Load Calculation 30

5.2 Diameter Design 31

5.3 Strength Check For Half-shaft 32

5.4 Strength Check For Half-shaft Spline 32

Chapter 6 Driving Axle Housing Design

6.1 Basic Requirements 34

6.2 Finite Element Analysis 35

Reference 36

Acknowledgements 37

Appendix 38

Chapter 1

Introduction

1.1 Purpose and Significance

As a major automobile assembly, driving axle bears vertical force, longitudinal force and lateral force from road surface and frame, as well as braking torque and reaction torque. Its structural type and design parameters not only have a significant impact on the reliability and durability of the car, but also driving performance such as power, economy, and ride comfort. In addition, drive axle is also a large assembly that covers a wide variety of mechanical parts, components, subassemblies, and the like in various automobile assemblies. For example, a driving axle includes a final drive, a differential, a wheel-driven transmission (half-axle and wheel-side reducer), an axle housing, and various gears. It can be seen that the design of driving axle involves an extremely wide range of mechanical components, and almost all modern mechanical manufacturing processes are used in these manufacturing processes. Therefore, through practice of automobile driving axle design, designers are able to better learn and master the comprehensive knowledge and skills in modern automobile and mechanical designing field.

The purpose of this dissertation is to complete the design and calculation of the final reducer, differential, and other parts of the drive axle, which match the working conditions of EQ1092F1 best, and to check their strength.

1.2 Analysis of Research Status at Home and Abroad

The development mode of driving axle manufacturing in China can be divided into mapping, introduction, and independent development. Most Chinese companies are backward, with low technical content, insufficient technological innovation, and less application of computer aided design. Among the majority of SMEs in China, their main development model is to map the products with great sales in market. In particular, many small-scale enterprises or private enterprises, due to low technological content and lack of development funds, specialize in surveying and mapping the driving axles of cars that sell more prosperously and sell them to unsound accessories market in China. This kind of development mode cannot fundamentally improve the level of development of our drive axle product.

At abroad, engineers mainly use modular technology and modal analysis to design automobile driving axle. Modular design is a design method that divides and designs a series of function modules based on the functional analysis of a certain range of mechanical products with different functions, same function but different performance, and different specifications, and then constitutes different products through the selection and combination of these modules. And design a series of function modules, and then constitute a design method for different products through the selection and combination of modules. Many Italian companies represented by DANA have adopted this type of design method. In addition, the application of modal analysis is also extensive. It is one of the most advanced modern methods for vibration analysis of engineering structures, which can be defined as analytical analysis (finite element analysis) and experimental analysis (experimental modal analysis) of dynamic characteristics of structures. Its structural dynamic characteristics are characterized by modal parameters. The characteristics and advantages of modal analysis technology are that in the dynamic analysis of the system, the modal coordinates are used instead of the physics coordinates, so that the number of degrees of freedom of the system analysis can be greatly reduced and the analysis accuracy promotes significantly.