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摘要

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

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