A

SEMINAR REPORT

ON

SUSPENSION SYSTEM IN AUTOMOBILE

Submitted in partial fulfilment of the

requirements for the award of the degree

of

BACHLORE OF TECHNOLOGY

In

MECHANICAL ENGINEERING

Submitted to Submitted by

Mr. Anil Kumar Mahawar Devendra Kumar

(HOD Deptt. Of Mechanical Engg.) 11EAEME721

AIET, Alwar

Department of Mechanical Engineering

ALWAR INSTITUTE OF ENGINEERING & TECHNOLOGY ALWAR (RAJ)

Rajasthan Technical University, Kota

November-2014

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ACKNOWLEDGEMENT

We wish to pay our sincerest gratitude to our respected teachers for their invaluable support

and constructive suggestion beside all pains he took for the successful finalization of our

project

A special note of thanks to Mr. Anil Kumar Mahawar (HOD Deptt. of ME) for unique way

of inspiring students through clarity of thought, enthusiasm and caring and for providing

necessary resources.

My special thanks go to my friends for giving me support and encouragement and for

everything else.

Devendra Kumar

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ABSTRACT

Suspension system of an automobile separates the wheel and axle assembly of the

automobile from its body. Main function of the suspension system is to isolate the body of

the vehicle from shocks and vibrations generated due to irregularities on the surface of

roads. Shock absorbers are provided in the vehicles for this purpose. It is in the form of

spring and damper. The suspension system is provided both on front end and rear end of

the vehicle. A suspension system also maintains the stability of the vehicle in pitching or

rolling when vehicle is in motion. Suspension system is the term given to the system of

springs, shock absorbers and linkages that connect a vehicle to its wheels. When a tire hits

an obstruction, there is a reaction force and the suspension system tries to reduce this force.

The size of this reaction force depends on the unsprung mass at each wheel assembly. In

general, the larger the ratio of sprung weight to unsprung weight, the less the body and

vehicle occupants are affected by bumps, dips, and other surface imperfections such as

small bridges. A large sprung weight to unsprung weight ratio can also impact vehicle

control.

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TABLE OF CONTENTSSr. No. Topic Page No.

CHAPTER-1 INTRODUCTION 1-13

1.1 Suspension system 1

1.2 History 3

1.3 Objectives of Suspension System 4

1.4 Types of Suspension System 6

1.5 selection of suitable suspension system 13

CHAPTER-2 BASIC SUSPENSION SYSTEM 14-15

2.1 Classification of Suspension System 15

CHAPTER-3 DESIGN OF SUSPENSION SYSTEM 16-20

CHAPTER-4 SUSPENSION SYSTEM CONSTRUCTION 21-27

4.1 Control Arms 21

4.2 Strut Rod 21

4.3 Ball Joints 22

4.4 Shock Absorbers 24

4.5 Strut Assembly 26

4.6 Sway Bar (Stabilize Bar) 26

4.7 Track Rod 27

4.8 Independent and Non-independent Suspension Systems 28

CONCLUSION 30

REFERENCES 31-32

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LIST OF FIGURES

FIG. NO. FIG. NAME PAGE NO.

Fig. 2.1 Basic suspension system 14

Fig. 2.2 Based on spring medium 15

Fig. 3.1 Front Wishbone 17

Fig. 3.2 Rear Wishbone 18

Fig. 3.3 Front Knuckle 18

Fig. 3.4 Modified Front Knuckle 19

Fig. 3.5 Rear knuckle 19

Fig. 3.6 Modified Rear Knuckle 20

Fig. 4.1 Control Arm 21

Fig. 4.2 Steering knuckle for front-wheel-drive 22

Fig.4.3 Tapered stud provides a force fit into the steering

knuckle or bearing support

23

Fig.4.4 This shock uses pressurized gas, acting on the oil to

reduce foaming

24

Fig.4.5 Shock Absorber Action 25

Fig.4.6 Strut Assembly 26

Fig.4.7 Sway Bar 27

Fig.4.8 Track Rod 27

Fig. 4.9 Independent and Non-independent Suspension Systems 28

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