金杯SY1033型货车驱动桥设计

学院（系）： 国际教育学院

专业班级： 车辆gj1402班

学生姓名： 李府锟

指导教师： 杜小芳

学位论文原创性声明

（黑体小二号）

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。

（宋体小四号）

作者签名：

年 月 日

学位论文版权使用授权书

（黑体小二号）

本学位论文作者完全了解学校有关保障、使用学位论文的规定，同意学校保留并向有关学位论文管理部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权省级优秀学士论文评选机构将本学位论文的全部或部分内容编入有关数据进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本学位论文。

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“√”）

（宋体小四号）

作者签名： 年 月 日

导师签名： 年 月 日

(注：此页内容装订在论文扉页)

Abstract

With the constant focus on safety, energy saving, environmental protection, automobile rear axle as the vehicle one of the key components, the quality of its products using the safety of the vehicle and the vehicle performance influence is very big, so to optimize the automobile rear axle design calculation is very necessary.

Drive axle as one of the four automobile assemblies, its performance has a direct impact on the performance of the vehicle, and is particularly important to the truck. When the high output torque is used to meet the high efficiency and high efficiency of the current heavy-duty truck, it must be equipped with an efficient and reliable drive axle. Therefore, the single-stage deceleration drive with high transmission efficiency has become the development direction of the future truck. Based on the design of the traditional drive axle, this paper carries out the design of the truck drive axle.

Firstly, the structure type and main design parameters of the main components are determined. Then, the overall design scheme is determined by referring to the structure of the drive axle. Finally, the strength of the main, driven bevel gear, differential cone planetary gear, half shaft gear, full floating axle and integral axle housing is checked. After design and calculation, CATIA software is used to model and assemble all parts.Keywords: Driving Axle; Main Gear Box; Differential Device; Rear Axle;Bridge Shell

Key words: drive axle; Main reducer; Differential; Half shaft; Axle housing.

catalogue

Abstract 1

Chapter 1 introduction 4

1.1The purpose and significance of project research 4

1.2 A summary of domestic and foreign research status 4

1.3 Research content of this subject 7

Chapter 2 Design of Drive Axle 9

2.1 Determination of drive axle scheme 9

Chapter 3 Design of main Reducer 12`

3.1 Structural type of main reducer 12

3.1.1 Main reducer gear type 12

3.1.2 Deceleration form of main reducer 12

3.1.3 Support form of main, driven gear for main reducer 13

3.2 Selection and calculation of basic parameters of main Reducer 13

3.2.1 Determination of the main deceleration ratio 13

3.2.2 Calculation of calculating load of main deceleration Gear 14

3.2.3 Selection of basic parameters of main reduction Gear 15

3.2.3.1 Selection of number of teeth 15

3.2.3.2 The selection of the diameter of the indexing circle in the large end of the driven gear 16

3.2.3.3 Selection of Gear End-face Modulus 16

3.2.3.4 The selection of the face width of the driven bevel gear 16

3.2.3.5 Midpoint helical angle β 17

3.2.3.6 Direction of spiral 17

3.2.3.7 Normal pressure angle α 17

3.3 Strength check 18

3.3.1 Failure form and Life of Gear 18

3.3.1.1Tooth breakage 18

3.3.1.2 Pitting and exfoliation of tooth surface 19

3.3.1.3 Tooth surface gluing 19

3.3.1.4 Tooth surface wear 19

3.3.2 Circumferential force on a unit tooth 20

3.3.3 Calculation of bending strength of gear teeth 20

3.3.4 Calculation of contact strength of gear teeth 21

Chapter 4 Design of Differential 22

4.1 Structural form of differential 22

4.2 Selection and calculation of basic parameters of differential 24

4.2.1 Selection of basic parameters of planetary gear 24

4.2.2 Determination of spherical Radius of Planetary Gear 24

4.2.3 Selection of tooth number of planetary gear and half shaft gear 25

4.2.4 Preliminary determination of modulus of differential bevel gear and pitch diameter of half shaft gear 25

4.2.5Pressure angle α 25

4.2.6 Planetary gear shaft diameter d and supporting length L 26

4.7 Strength calculation 26

Chapter 5 Design of Half-Shaft 28

5.1 Determination of calculating load of full floating half shaft 28

5.1.1 Selection of rod diameter of full floating half shaft 28

5.1.2 Strength calculation of full floating semi shaft 29

Chapter 6 Drive Housing Design 31

6.1 Selection of vehicle axle housing structure 31

6.2Analysis of the structural scheme of the drive axle housing 31

conclusion 33

reference documentation 34

Thanks 35

Chapter 1 introduction

1.1 The purpose and significance of project research

Automobile drive axle is the important part in the automobile transmission system, bearing the weight of the full load of vehicle and ground by wheel, frame and monocoque body by the suspension of vertical force and horizontal force and moment, as well as the impact load;The drive axle also carries the maximum torque in the transmission system, and the axle housing is also bearing the reaction torque. Automotive drive axle of the structure and design parameters in addition to have important influence on automobile reliability and durability, and performance of the car, such as performance, fuel economy, comfort, mobility and stability has a direct effect.

Through to the axle design and research, to deepen the theory of car design, car technology development direction and the understanding of the structure of the car to enter the social work in the automotive technology lay a solid foundation. Basic parameter design shall be carried out in accordance with the design theory, according to the theory of automobile structure, automobile and automobile design, on the basis of complete chassis parts structure design, and based on the computed parameters of surveying and mapping of the prototype structure.

1.2 A summary of domestic and foreign research status

The competition of heavy axle market in China is mainly two-stage bridge and single-stage bridge. Due to the secondary deceleration, the deceleration ratio of the main reducer is smaller, the main reducer assembly is relatively small, and the drive axle is relatively smaller, so the gap between the ground and the ground is increased, and the adoption is good. The series is mainly used for road transportation, as well as oil, mining, forestry, field operations and troops. Single-stage bridge by the main reduction gear speed reducer, drive axle size is big, small gap from the ground, and compared with double bridge, through the sex is bad, it is mainly used for road transportation vehicles shall be carried out in accordance with the design theory of basic design parameters, according to the theory of automobile structure, automobile and automobile design, on the basis of complete chassis parts structure design, and based on the computed parameters of surveying and mapping of the prototype structure[1].

With the improvement of China's highway condition and the change of the logistics industry to the vehicle performance requirements, the technology of the truck drive axle has presented the trend of unitization. The single-stage deceleration drive axle is the simplest one in the drive axle, the manufacturing process is simpler, the cost is lower, it is the basic model of the drive axle, and occupies an important position in the heavy truck. At present, the development trend of heavy truck engine to low speed and high torque makes the transmission ratio of drive axle to small speed ratio development; With the improvement in road conditions, especially the rapid development of highway, many heavy trucks use conditions to reduce the car through performance demands, therefore, heavy truck products don't have to be like in the past, improve its complex structure was used; Compared with the drive axle with wheel rim reducer, the mechanical transmission efficiency of the single-stage deceleration drive axle is improved, the vulnerable parts are reduced and the reliability is increased due to the simplification of the product structure[2].

The main reducer can be divided into single and double stages according to its deceleration form. Single stage through type main reducer has simple structure, small size, quality, and can make, most of the rear axle parts, especially the axle housing and half shaft has the advantages of interchangeability, now mainly used for light drive cars.