摘 要

本文介绍了悬架系统并讨论了商用车东风天龙DFL4251的悬架选型，对其前、后悬架的部分结构进行了设计。包括分析悬架受力，计算悬架刚度，校核零件强度等。主要对悬架的弹性元件、减振器以及平衡悬架的推力杆进行了设计计算。探讨了少片变截面弹簧在商用车上的运用。

关键词：悬架； 少片变截面钢板弹簧； 减振器； 推力杆

Abstract

This paper introduces the suspension system, and discusses the suspension type selection of the commercial vehicle Dongfeng TianlongDFL4251.Design the structure of the front and rear suspension for Dongfeng TianlongDFL4251. Including the analysis of suspension force, suspension stiffness calculation, check the strength of parts and so on. The design and calculation of the elastic elements, shock absorbers and thrust bars of the balance suspension are mainly carried out. The application of taper-leaf spring in commercial vehicle is discussed.

keyword： suspension； taper-leaf spring； shock absorbers； thrust rod

Catalog

Chapter1. introduction 1

1.1 Present situation and development of Chinese automobile industry 1

1.2 Significance of subject research 2

Chapter2. Introduction to suspension systems 3

2.1 The function of automobile suspension system 3

2.2 Composition of automobile suspension system 3

2.3 Classification of automotive suspension systems 4

2.4 Selection of suspension layout and material 5

Chapter 3. Design and calculation of automobile front suspension system 7

3.1 Design given parameters 7

3.2 Determination of main parameters of front suspension 7

3.2.1 Selection of natural bow of front suspension 7

3.2.2 Selection of dynamic deflection of front suspension 7

3.3 Determination of main parameters of taper leaf spring of front suspension 7

3.3.1 Determination of full-load slack 7

3.3.2 Determination of leaf spring length 7

3.4 Design of taper leaf spring 8

3.5 Steel plate spring assembly arc height and radius of curvature in the free state

calculation 9

3.6 Design of steel plate spring eyes 10

3.7 Design of leaf spring pin 11

3.8 Design of shock absorber 12

3.8.1 Selection of shock absorber 12

3.8.2 Selection of relative damping coefficient 12

3.8.3 Determination of damping coefficient of shock absorber 13

3.8.4 Calculation of maximum load 14

3.8.5 Determination of working cylinder diameter of cylinder shock absorber 14

Chapter 4 Design and calculation of automobile rear suspension system 15

4.1 Determination of main parameters of rear suspension 15

4.1.1 Selection of natural bow of rear suspension 15

4.1.2 Selection of dynamic deflection of rear suspension 15

4.2 Determination of main parameters of taper leaf spring for rear 15

4.2.1 Determination of length of leaf spring for rear suspension 15

4.3 Design of taper leaf spring of rear suspension 15

4.4 Leaf spring rear suspension assembly arc height and radius of curvature in the free state calculation 16

4.5 Design of shock absorber for rear suspension 17

4.5.1 Selection of shock absorber for rear suspension 17

4.5.2 Selection of relative damping coefficient of rear suspension damper 17

4.5.3 Determination of damping coefficient of rear suspension shock absorber 18

4.5.4 Suspension shock absorber maximum discharging force 19

4.5.5 Determination of working cylinder diameter of rear suspension tube shock absorber 19

Chapter 5. Selection of center distance of leaf spring 19

Chapter 6.Design and verification of thrust bar in rear balance suspension 21

Chapter 7. Conclusion 23

References 23

Thank 2

Chapter1. Introduction

The automobile suspension is an important part of the modern automobile, the function of the suspension is to connect the wheels of the car with the frame. It has an important role in handling stability, comfort and safety. With the continuous improvement of automotive performance requirements. The optimization of the suspension design is not only to improve the performance of the vehicle structure, but also the focus of the consumer on the market today. Comprehensive automobile parameters, optimize the design of suspension system with modern technology of Dongfeng TianlongDFL4251, to design a safe, comfortable, strong control of vehicle suspension is the main goal of the design.

1.1 Present situation and development of Chinese automobile industry