MAJOR SYSTEMS AND COMPONENTS OF AN AUTOMOBILE - Session 1: Chassis and Auto Body

Oct 1, 2026

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The document introduces major systems and components of an automobile, explaining how an automobile is built from interconnected components, assemblies, and systems. It outlines the five key auto component segments: engine parts, drive transmission and steering parts, suspension and brake parts, electrical parts, and body and chassis. It then focuses on Session 1, defining the chassis, listing its major components, and describing the chassis functions in supporting loads and controlling motion. Next, it covers the automobile body or superstructure, its types for integral and conventional construction, and key requirements for an automobile body.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages59

Reading Time2 h 29 min

AccessFree to download

INTRODUCTION

SESSION 1: CHASSIS AND AUTO BODY

Chassis

Functions of the chassis

Automobile Body or Superstructure

Requirements of automobile body

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B. Multiple choice questions

# INTRODUCTION In the previous Units,we learnt about the differenttypes of automobile.In this Unit,we will discuss themajor systems and components of an automobile.Anautomobile is made of several components,assembliesand systems.The growing automotive industry hasgiven rise to a growing auto component industry also.India has emerged as a global outsourcing hub formanufacturing of various automobile components.Allmajor companies like Toyota,Hyundai,Ford,Volvo,Renault and others are now sourcing their automotivecomponents from Indian manufacturers. The auto components industry is predominantlydivided into five segments. (i)Engine parts (ii)Drive transmission and steering parts (iii)Suspension and brake parts (iv)Electrical parts (v)Body and chassis 17969CH03 Fig.3.1:Chassis with suspensionand exhaust system Global automobile manufacturers see India as amanufacturing hub for auto components due to thefollowing reasons: (i)Low-cost labour force and availability of raw material which makes India cost competitive (ii)An established manufacturing base in India ii)Setting up of the operations of major international auto components including Delphi,Visteon,Bosch and Meritor in India (iv)Setting up of International Purchasing Offices(IPOs)of automobile manufacturers and autocomponent manufacturers in India (v)Fine-quality components manufactured in India (vi)India being a global hub for research anddevelopment (R&D),General Motors,DiamlerChrysler,Bosch,Suzuki,Johnson Controls,etc.,have their research centres in India In this Unit,you will learn about the variouscomponents and systems that make a completeautomobile—the engine and its parts,the bodyand chassis,drive transmission and steering parts,suspension and brake parts,electrical parts and othersystems that make running an automobile possible. # SESSION 1:CHASSIS AND AUTO BoDY Chassis Chassis is a French term and was initially used todenote the frame or main structure of a vehicle.Thechassis(Fig.3.1)containsall themajorunits necessaryto propel the vehicle,guide its motion,stop it andallow it to run smoothly over uneven surfaces.It isthe main mounting for all the components includingthe body.It is also known as the carrying unit. The chassis includes the following majorcomponents. (i)A steel frame,which is a major part. (ii)In case of a passenger car,the whole body isalso an integral part of the chassis.However,incommercial vehicles like trucks and buses,thebody is not a part of the chassis.Therefore,achassis is almost a complete vehicle except the body and other accessories,which are not involvedin the movement of the vehicle. (iii)Other major components include engine,transmission system,front and rear axle,steeringsystem,suspension system,wheels,tyresand brakes. # Functions of the chassis The functions of the chassis includes (i)carrying theweight of thevehicle and itspassengers, (ii)withstanding the engine and transmission torqueand thrust stresses,as well as accelerating andbraking torque, (iii)withstanding the centrifugal force while taking aturn and (iv)withstanding the bending load and twisting due tothe rise and fall of the front and rear axles. # Automobile Body or Superstructure In case of integral or frameless construction,the bodyis anintegral part of the chassis.But,in case of the conventionalchassis,the body or superstructure is made after receivingthe chassis from the manufacturer.The shape of the bodydepends upon the ultimate use for which the vehicleis meant. The body of a car (Fig.3.2)is made of a sheet of metalor fibre glass,so that passengers can sit in it.To make Fig3.2:Body of a car MAJOR SYSTEMS AND CoMPONENTS OF AN AUTOMOBILE the journey comfortable,cushioned seats are provided.The body is provided on all sides with glass panes fixedto protect the passengers from dust and rain. The body of a bus is made of metal,like (a)steel section pillars with steel sheet panelling,(b)steel sect

FAQs

What are the five main segments of the auto components industry mentioned in the document?

The document divides auto components into five segments: (i) Engine parts (ii) Drive transmission and steering parts (iii) Suspension and brake parts (iv) Electrical parts (v) Body and chassis.

What is the chassis and what is its primary purpose?

A chassis is described as the frame or main structure of a vehicle. It contains major units needed to propel and guide the vehicle, stop it, and allow smooth running over uneven surfaces, and it serves as the main mounting for components including the body.

How do the body and chassis differ between integral (frameless) and conventional construction?

For integral or frameless construction, the body is an integral part of the chassis. For conventional chassis, the body or superstructure is made after receiving the chassis from the manufacturer, and its shape depends on the vehicle’s intended use.

Oct 1, 2026

Upload by Muffet