Graduation Design (Thesis) of Wuhan University of Technology

Overall design of rear axle of 6780 medium - sized passenger car

(School): International Education College

Specialty amp; Class: Sino-British vehicle engineering

vehicles（g j）class 1303

Student name: Zhang teng

Tutor: Qiao Wei Gao

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Abstract

Medium size passenger vehicle take a large proportion of commercial vehicles production, and the drive axle is one of the most important structure. Drive axle is the one of automobile four important assemblies, Its performance directly influence on the entire automobile, especially for the Medium size passenger vehicle. The configuration of the Driving Axle is introduced in the thesis at first.

In the design, we accomplished the design for single main speed reducer, tapered Planetary Gear Differential Mechanism, Full Floating Axle, the checking of Axle Housing and the election of the material and so on.In this paper, first of all determine the structure of major components and the main design parameters, the analysis of the various parts of the structure of the bridge drive type, the form of the development process and its advantages and disadvantages of the past, determined on the basis of the design program, using the traditional design method of various parts of the drive axle Main reducer, differential, axle, axle housing was designed to calculate and complete the check. Finally complete the final assembly drawing by using AUTOCAD and mapping the main components.

Keywords: Medium size passenger vehicle; Drive axle; single main speed reducer; Differential

Table of Contents

1 Introduction 1

1.1 The purpose and significance of the topic 1

1.2 Research situation of rear axles at home and abroad 1

1.3 Design of the main content 1

2 Determination of the overall plan about the rear axle 3

2.1 The type of bridge, structure, design requirements and the main parameters 3

2.1.1 Types of rear axles 3

2.1.2 Rear axle structure composition 3

2.1.3 Rear axle design requirements 3

2.1.4 Design models of the main parameters 4

2.2 Determination of the main reducer structure program 5

2.2.1 Calculation of main reduction ratio 6

2.2.2 Gear type of main reducer 7

2.2.3 Deceleration mode of main reducer 8

2.2.4 Installation method 9

2.3 Summary of this chapter 9

3 Main reducer design 10

3.1 Selection and intensity calculation of gear parameters of main reducer 10

3.1.1 Determination of the load of the main reducer gear 10

3.1.2 Selection of gear parameters for main reducer 11

3.1.3 Calculation of bearing of main reducer 14

3.2 Main gear reducer gear material and heat treatment 20

3.3 Summary of this chapter 21

4 Differential design 22

4.1 Structure of symmetrical conical planetary gear differential 22

4.2 Design of Symmetrical Cone Planetary Gear Differential 22

4.2.1 Calculation of the strength of the differential gear 22

4.2.2 Determination of Spherical Radius of Planetary Gear 23

4.2.3 Planetary gears and the number of gears on the side gear 23

4.2.4 Planetary gear and side gear pitch angle and modulus 23

4.2.5 Pressure angle 23

4.2.6 Planetary gear shaft diameter d and support length L 24

4.3 Summary of this chapter 25

5 Design of axle axle axle housing 25

5.1 Design and calculation of axle 25

5.1.1 Primary selection of full-floating half-shaft section diameter 25

5.1.2 Calculation of full-floating half-axis strength 26

5.1.3 Calculation of spline strength of full floating axle 27

5.1.4 Axle material and heat treatment 28

5.2 Force Analysis and Strength Calculation of Axle Housing 28

5.2.1 Strength Calculation of Axle Housing under Unequal Pavement Impact Load 28

5.2.2 Calculation of the strength of the axle housing when the vehicle is driven at