AUTOMOBILE THEARY
UNIT-1 INTRODUCTION AND TECHNOIOGY:
Necessity of motor vehicle body – Classification of motr vehicle body –
Passenger car bodies – Unitized body construction – Separate body and chassis construction –
Saloon – linomusine – runabout – station wagon – convertible – goods vehicle – flag platform –
drop side – fixed side – articulated vehicle – drawbar trailers – tipper – tanker – chassis van –
commercial passenger vehicle – town bus – suburban bus – luxury coach – body engineering
terminology – body sill – bonnet – bulk head – cant rail – door skins – door trim – drip rail or
drip moulding – fender – head lining – heel board quarter panel – quarter light – scuttle panel –
tunnel – wheel arch – bearers – cleat – COE/demountable – drop well – dunnage – GPR –
glasonite – huckbolt – kick plate – longitudes – overhand – rave – reefer – rope – hook – rubtail
– spandrel – x bearer – body trim cowl – cove mould – fish plate – hand tools for body shop –
dining hammer, dolly blocks, pick tools, spoons, pry bars, solder paddle.
UNIT-2
CHASSIS
FRAME
PRINCIPLE,
BODY
DESIGN
CONSIDERATION:
General consideration – wheel base – truck – front and rear overhang – types of
frame – ladder type – centre drop – back bone type – flitch plate – frame length alterations –
precautions while drilling and welding frames – propeller shaft alteration.
Design consideration – external dimensions – statutory obligation – visibility –
space consideration – body shape – noise elimination – forces in body members – minimum
material condition – aerodynamics – aerodynamic drag – low drag body – effects of side winds.
UNIT-3 PASSENGER CAR AND GOODS VEHICLE BODY
CONSTRUCTION:
Material requirements and body parts requirements of steel sheets used for body
construction – thickness rate of steel sheets and their uses – function of body parts such as center
pillar, rear bulk head and parcel shelf, roof and back window aperture panel, shroud and dash
panel assembly – sealing body panels against corrosion due to dust,fumes and water – protective
fillings – wind shield and quarter glasses – use of glass reinforced plastic fiber in passenger body
construction – advantages – weight considerations – aerodynamic considerstions – methods of
reducing air drag on haulage vehicles – air vane – air flow guide – flat platform construction –
drop side construction – tipper body construction – tanker construction – all aluminium box type
construction.
UNIT-4 BUS BODY DESIGN AND CONSTRUCTION:
Separate body and chassis and construction – body cross section and details of
structural members – integral monocoque construction – advantages and disadvantages –
necessity of transverse bearers – body materials – uses of timber – plywood,glass reinforced
plastic and sunmica – thermal insulation – materials – antisqueak provisions – interior and
exterior paneling techniques – use of pop rivets and huck bolts – doors-inward gliding doors
combination – advantages – luxury coach body work – hat racks – ducts for supplying fresh air –
natural and artificial ventilation – seating – comfortable seating angles – audio systems – air
conditioning.
UNIT-5
VEHICLE
BODY
PAINTING,REPAIRING
AND
MAINTENANCE:
Necessity for painting – preparation – methods of removing old paint – pre
treatment of surface for painting – paints – types – acrylic lacquer, acrylic enamel, urethane
enamel, synthetic enamel, metallic selection of paints – under chassis painting – uses of primer –
selection of primer – uses of fillers – three coat process sequence – spray and hand painting
techniques – finishing & polishing – spray guns – types – body defects – causes and remedies –
body corrosion – types of corrosion – causes of corrosion – remedial measures.