Graduation Design (Dissertation) of Wuhan University of Technology

The Overall Design of 6490 Light Bus Rear Axle

College (Department)：International Education Institute

Specialty ：Vehicle Engineering

Class： gj1303

Student Name： Cheng Peng

Tutor： Qiao Wei Gao

Statement of Originality

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Abstract

This paper is designed for 6490 light bus drive axle, driving axle in the car's four major assembly occupies a very important role, its structural parameters for the car's power ride and other properties have a great impact. At present, this model is generally used for cargo manned two purposes, is an important means of transport, he does not need as high as the passenger car ride comfort, do not need a truck as large load, so The purpose of this design is to compromise these two aspects, the design of high economic after the drive axle. The design includes the main reducer, differential gear, axle, drive axle housing. The main reducer design includes structural selection and parameter design calculations, gear and bearing strength check. The differential includes the planetary gear, the axle gear parameter calculation and the strength check, the axle gear contains the specific size parameter, the spline parameter and the strength check. The bridge shell includes the strength check for various operating conditions.

Key Words : Light Bus ；Drive Axle Reducer ；Differential

Catalog

Chapter 1 Introduction 1

1.1 Research background status and purpose 1

1.1.1 Research background 1

1.1.2 Research status at home and abroad 1

1.1.3 Purpose Meaning 2

1.2 Design parameters of the drive axle 2

1.2.1 Important technical parameters 2

Chapter 2 Design of Main Reducer 4

2.1 The structure of the main reducer 4

2.2 Deceleration structure of main reducer 5

2.3 Main reducer of the main and driven bevel gear support program 5

2.3.1 Support for active bevel gears 5

2.3.2 Support for driven gears 6

2.4 The selection and calculation of the basic parameters of the main reducer 6

2.4.1 Determination of main reduction ratio 6

2.4.2 Determination of the load of the main reducer gear 6

2.4.3 Determination of the basic parameters of the main reducer gear 8

2.4.4 Determination of the geometrical dimensions of the main gear reducer 10

2.5 Calculation of the strength of double - surface gear of main reducer 20

2.6 Calculation of main reducer bearings 23

Chapter 3 Differential Design 28

3.1 The choice of the mechanism of the differential 28

3.2 Design of Symmetrical Cone Planetary Gear Differential 29

3.2.1 basic parameters of the differential gear selection 29

3.2.2 Geometric calculation of differential gears 30

3.2.3 Differential gear strength calculation 31

Chapter 4 Axial design 33

4.1 Selection of the construction of the half shaft 33

4.2 full float semi-axis design 33

4.2.1 Determination of load of full-floating axle calculation 33

4.2.2 Primary selection of full-floating half-shaft rod diameter 33

4.2.3 Calculation of the strength of full floating axle 33

Chapter 5 Drive axle housing design 36

5.1 Selection of drive axle housing structure 36

5.2 Force analysis and strength calculation of axle housing 36

5.2.1 Calculation of static bending stress of axle housing 36

5.2.2 Calculation of axle housing strength under impact load on uneven road surface 38

5.2.3 Calculate the axle housing strength of the vehicle with maximum traction 38

5.2.4 Calculation of axle housing strength in emergency braking of automobile 40

5.2.5 Calculation of axle housing strength when the vehicle is subjected to maximum lateral force 41

References 43

Appendix A 44

Thanks 51

Chapter 1 Introduction

1.1 Research background status and purpose

    By analyzing the current situation and purpose of the research background, i hope to have a more profound understanding of the design for the drive axle.

1.1.1 Research background

6490 light bus rear axle, also known as the drive axle, which includes the main reducer, differential, half axle, so on. It has the function of slowing, increasing torque, changing the direction of torque transmission, and withstanding the ground and suspension of the vertical power transmission, longitudinal force, lateral force, and torque. The design of the main reducer structure and parameters affects the vehicle's power, fuel economy, and its durability and stability. Different type of vehicle match different parameters, such as loading quality, maximum speed, minimum turning radius, maximum climbing slope and so on.

China's auto industry in 2015 is in dilemma, and the accumulation of stocks is increasing, some manufacturers in order to ease the financial pressure, have none other but promotions. Therefore, in this case, companies should gain a firm foothold, we must try to reduce production costs. Driving axles in the car occupies a very important position, especially commercial vehicles, a simple structure, reliable performance, low cost of the drive axle, for the enterprise and the entire automotive industry can provide good benefits and development.