(论文)

Graduation Design (Thesis) of Wuhan University of Technology

Drive axle design for 1.6 liter sedan

学院(系)： 国际教育学院

(School): International Education School

专业班级： 车辆gj1302

Specialty amp; Class: vehicle engineering gj1302

学生姓名： 郭健雄

Student name: Guojianxiong

指导教师： 韩爱国

Tutor: Hanaiguo

学位论文原创性声明

Statement of Originality

本人郑重声明：所呈交的论文是本人在导师的指导下独立进行研究所取得的研究成果。除了文中特别加以标注引用的内容外，本论文不包括任何其他个人或集体已经发表或撰写的成果作品。本人完全意识到本声明的法律后果由本人承担。

I solemnly declare that the thesis I submit is a piece of writing I completed independently based on my own research under the guidance of my supervisor. Except for the quotations, this paper does not include any writings published or completed by other individuals or groups. I am fully aware that the legal consequences of this statement are borne by me.

作者签名：

Signature of the author:

年 月 日

Date:

学位论文版权使用授权书

Copyright Letter of Authorization to The Dissertation

The author of this dissertation fully understands provisions stipulated by this school on keeping and using dissertations. The author agrees that the school can reserve and send photocopies and electronic versions of this thesis to relevant departments or institutions managing dissertations. This thesis can be read and borrowed. I hereby authorize excellent provincial institutions appraising bachelor dissertations to incorporate all or any part of this dissertation into relevant databases for retrieval, as well as to preserve and compile this dissertation by photocopying, scanning or reprinting it in a reduced format.

本学位论文属于1、保密囗，在年解密后适用本授权书

2、不保密囗。

(请在以上相应方框内打“√”)

This dissertation is: 1. Confidential until(year) and then this authorization letter will apply. 囗

2. Non-confidential. 囗

(Please tick "√" the corresponding box above)

作者签名： 年 月 日

Signature of the author: Date

导师签名： 年 月 日

Signature of the tutor: Date

(Not: this page shall be stapled together with this dissertation as its title page)

Abstract

With the development of the automobile industry and the continuous improvement of productivity, the dynamic performance of the car attracts more and more attention from people, while the good dynamic performance does not only result the performance of the engine, but also the entire power system, where drive axle plays a very important role. Located at the end of transmission, drive axle can change the transmission speed and torque, and delivers them to the drive wheel mechanism. Composed of final drive, differential, wheel drive, drive axle housing, semi axle and constant velocity universal joint, its components also play a vital part in vehicle. Like the drive bridge acts on the transport of vertical force, longitudinal force and lateral force, as well as braking torque and reaction force between the road surface and the frame or the body. Therefore, the design of drive axle plays an important part in vehicle design.

This design refers to the design of the traditional drive axle, and carries on the the 1.6 liter traditional sedan car. As all through the relevant parameters are given, we should determine the structure design of the drive axle like the single-stage final drive, symmetrical bevel gear differential, full floating semi axle structure; then calculate the final drive, differential, semi axle and other parts of the main parameters and determine its the size within structures, and do strength check, in order to meet the design requirements. To finish 3D geometry model of all parts we are using the three-dimensional modeling software CATIA and CAD, to draw the differential straight bevel gear and hypoid gear reducer using parametric modeling.

Key Words：Drive axle; Final drive; Differential; CATIA; CAD

Contents

Abstract 4

Chapter 1 Introduction 8

1.1 Overview 8

1.2 The research status of the design and analysis of drive axle 10

1.3 The following basic requirements when designing a drive axle 10

Chapter 2 Drive axle structure scheme 11

2.1 Design requirements of drive axle 11

2.2 Open type drive axle 12

2.3 Divided drive axle 13

2.4 Selection of drive axle assembly structure 14

2.5 Input parameters 15

Chapter 3 Final drive design 16

3.1 The structure of the final drive 16

3.1.1 The deceleration form of final drive 17

3.1.2 Type of gear for final drive 19

3.2 Selection and design calculation of basic parameters for final drive 21

3.2.1 Determination of the final reduction ratio 21

3.2.2 Determination of calculation load of final drive 22

3.2.3 Selection of main parameters of bevel gear for final drive 24

3.2.4 Geometric dimension calculation of hypoid gear for final drive 29

3.2.5 Strength calculation of hypoid bevel gear for final drive 30

3.4 Material and heat treatment of the gear of the final drive 37

3.5 Lubrication of final drive 39

Chapter 4 Differential design 40

4.1 Differential overview 40

4.2 The selection of the type of mechanism of the differential 41

4.3 The principle of symmetrical bevel planetary gear differential mechanism 41

4.4 Structure of symmetrical bevel planetary gear differential 43

4.5 Design of symmetrical bevel planetary gear differential 43