论文总字数：59047字

武汉理工大学毕业设计（论文）

日产轩逸1.6L乘用车变速器设计

学院（系）： 国际教育学院

专业班级： 车轮gj1601

学生姓名： 廖佐江

指导教师： 袁晓红

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Abstract

This design is aimed at Nissan Sylvex 2019 classic 1.6XE Manual comfort version, considering its requirements of comfort, ease of operation, power and fuel economy, etc., mechanical transmission is designed. The transmission structure adopts two-axis five-speed transmission and lock ring synchronizer shift mechanism. The design process includes dynamic parameter analysis, transmission ratio distribution, transmission structure design and the checking of each component. Finally according to the parameters determined to complete the assembly drawing and part drawing drawing

Key words: mechanical transmission;structural analysis;strength check

Contents

Chapter 1 introduction.......................................................1

1.1overview.............................................................1

1.1.1design requirements of automobile transmission...................2

1.1.2current situation of transmission development....................2

1.2design content and methods.............................................4

Chapter 2 transmission mechanism and control mechanism of the transmission.......6

2.1gearbox transmission scheme analysis and choice.........................6

2.2arrangement scheme of reverse gear.....................................7

2.3 analysis of component structure scheme.................................8

2.3.1 The gear form...................................................8

2.3.2 Selection of transmission bearings..............................8

2.3.3 Form of gear shifting mechanism.................................10

Chapter 3 selection of main parameters of transmission.........................12

3.1 the number of transmission gears and transmission ratio distribution....12

3.1.1 determine the maximum and minimum transmission ratio.............12

3.1.2 determine the transmission ratio of each gear in the middle.......14

3.2 primary center distance..............................................15

3.3 gear parameters.....................................................15

3.3.1 gear modulus..................................................15

3.3.2 pressure Angle curvature.......................................16

3.3.3 Helical Angle.................................................16

3.3.4 tooth width b..................................................16

3.3.5 high coefficient of addendum...................................17

3.3.6 gear displacement coefficient..................................17

3.4 gear number distribution of each gear.................................18

3.4.1 determination of gear number and transmission ratio of each gear..18

3.4.2 correction of center distance..................................19

3.5 calculation of gear parameters of each gear...........................20

Chapter 4 tooth strength check...............................................26

4.1 selection of gear material...........................................26

4.1.1 selection principle of gear material............................26

4.1.2 selection of machining method and material of gear wheel..........26

4.2 calculation of torque of each axle....................................26

4.3 tooth strength check and calculation..................................27

4.3.1 calculation and check of tooth bending strength..................27

4.3.2 calculation and check of tooth contact intensity.................30

Chapter 5 the structure design and parameter calculation of shaft..............34

5.1 structural design of shaft...........................................34

5.1.1 diameter of primary shaft......................................34

5.2 calculation of shaft stiffness.......................................35

5.2.1 force analysis of gears........................................36

5.2.2 check the stiffness of the shaft................................38

5.3 axis strength check..................................................38

Chapter 6 Bearing selection and life calculation..............................40

6.1 bearing type selection...............................................40

6.2 Calculation of bearing life..........................................40

Chapter 7 transmission synchronizer and structural elements...................43

7.1 transmission synchronizer...........................................43

7.2 transmission housing................................................45

Conclusion.................................................................47

Reference..................................................................48

Acknowledgement............................................................49

Chapter 1 introduction

• 1. overview

Automobile is one of the most important means of transportation. The level of its design and manufacturing is an important symbol of the scientific and technological development in various countries. The automobile industry is capital-intensive, technology-intensive, talent-intensive, comprehensive and economically efficient. Therefore, almost all the industrial developed countries in the world regard it as the pillar industry of national economy without any exception.^[1]

With the rapid development of automobile industry, diversification and individuation have gradually become the trend of automobile development. The design of dynamic system plays an important role in the whole process of automobile design. Since the first car, engineers have been directly focusing their attention on the vehicle's transmission system to make driving easier.^[2] It is used to vary the torque and speed of the engine to the driving wheels, with the aim of enabling the vehicle to obtain different traction and speeds under a variety of driving conditions, while at the same time enabling the engine to operate under the most favourable conditions within the range. Therefore, the design significance of the transmission is very obvious and very important for the automobile design. In today's automobile performance requirements are getting higher and higher, vehicle comfort has become an important indicator to evaluate the vehicle, and not reasonable transmission design, will greatly reduce the vehicle comfort, increase the noise when driving, affecting the vehicle performance in all aspects.^[3] Most of the manufacturers of domestic economy cars are using the mechanical transmission. Although it has many shortcomings, such as large volume, vibration and noise, powerful shift impact, complex operation, etc., its high transmission efficiency, long service life, mature manufacturing process, reliable work performance and cheap price still attract many companies.^[4] With the continuous development of automobile industry, the transmission structure used in modern automobiles has many forms, but their basic structure principle is basically the same. For many large freight vehicles in order to obtain more continuous transmission ratio changes, the transmission is required to have more gear, so some transmissions in the common transmission on the basis of a sub-transmission, in order to obtain more gear, so as to meet the use of heavy vehicles. For this transmission, after the removal of the deputy gearbox, it can also be used in the number of gear requirements for the occasion. Transmission is generally composed of power transmission mechanism and control mechanism two parts. In recent years, the application of electronic control system and hydraulic control system enables the driver to control the transmission, so that the automobile engine can be more accurate control and utilization.

• • 1. design requirements of automobile transmission

Gearbox is a key part of mechanical transmission, which is widely used in the transformation of engine output power. The performance of the transmission has an important impact on the dynamic performance and economy of the vehicle as well as the reliability and portability of gear shifting.^[5]

In general, the transmission design needs to meet the following basic requirements:

(1) to ensure that the car has a certain power performance and economic performance；

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