3. Introduction….
Chassis is the significant structure of an
automobile
A skeletal frame with various mechanical
parts like engine, tires, brakes, steering and
axle assemblies
Usually made of a light metal or composite
plastic which provides strength needed for
supporting vehicle components and load on it
4. Types of chassis….
Ladder frame chassis
Tubular space frame chassis
Monocoque frame chassis
Ulasab monocoque chassis
Back bone frame chassis
Alluminium space frame
Carbon fibre monocoque
6. One of the oldest form of chassis that is still
used by most of the SUVs till today
Resembles a shape of ladder which having
two longitudinal rails interlinked by several
lateral and cross braces
The lateral and cross members provides
rigidity to the structure
7. it has no much advantage these days…. Easy and cheap
for hand built
Since two dimensional structure…. Torsional rigidity is
much lower than other chassis especially with vertical
loads or bumps
Most SUVs , classic cars ,lincoln town car, ford crown victoria
etc…..
9. Has a rectangular tube like a backbone and
simple in structure
made of glass fibre is used for joining front
and rear axle and responsible for the strength.
Space within structure used for positioning
drive shaft in case of rear wheel drive.
Drive train, engine and suspensions are
connected at the ends of the chassis
10. Strong enough for smaller sports cars and most space
saving other than monocoque chassis
Does not provide protection against side impact or off-set
crash and not strong for high speed cars
Lotus Esprit, Elan Mk2, TVR, Macros
12. Most modern cars use this type
A single piece of frame work that give shape
to the entire car and built by welding several
pieces together
Demand for monocoque chassis is increased
because it is suitable for robotized production
13. Inherently good crash protection and it is space
efficient and cheap for mass production
Heavy , impossible for small volume production
Nearly all mass production cars, all current porche
15. A 3-dimensional design employing number of
circular and square section tubes
Tubes are positioned in different sections to
provide mechanical strength against forces
from anywhere
Tubes are welded together and form a
complex structure
Very strong when compared with ladder and
monococoque chassis of the same weight
16. Very strong in any direction
Very complex, time consuming to built and engages a lot
of space , raise the door sill and results in difficult
accessto the cabin
All ferrari before the 360m ,Lamborghini Diablo, Jaguar
Xj220 ,caterham
17. Ulsab monocoque chassis
Traditional steel monocoque chassis
becomes heavier than ever ,as a result car
makers turned to replace steel with
alluminium
More cars use alluminium in body panels
American steel manufacturers hired Porsche
Engineering services to develop a new kind
of steel monocoque technology calls Ultra
Light Steel Auto Body (ULSAB)
18. Stronger and lighter than conventional monocoque
without increasing production cost
Still not strong enough for best sports car
Opel Astra and BMW 3series
20. Carbon fibre is the most sophisticated
material using in aircrafts, spaceships and
racing cars
Because of its superior rigidity to weight ratio
Several carbon fibres used in motor industry
like Kelvar which has rigidity to weight ratio
among them and can be found in body
panels of many exiotic cars
21. Lightest and stiffest chassis
The most expensive
McLaren F1 ,Bugatti EB110SS, Ferrari F50
22. Aluminium space frame
chassis
ASF consists of extruded aluminium sections,
vacuum die cast components and aluminium
sheets of different thickness
Highly stressed corners and joints and
extruded sections are connected by complex
aluminium die casting
40% lighter yet 40% stiffer than contemporary
steel monocoque
Its quite complex
23. Lighter than steel monocoque and space effecient
Still expensive for mass production
Audi
24. One box design
Offers biggest interior space and can frees up the space
by pushing windscreen forward
As the windscreen is pushed visibility is deteriorated
25. Cab forward design
Shortens the engine compartments ,move the windshield
forward so that its base rests near the front wheels, this is the
so called "Cab- forward" design. Chrysler tells us Cab
forward design frees up the room for front passengers
26. Sandwich Structure –
mercedes A class structure
This structure is called "Sandwich" because the horizontal-
orientated engine is placed above the floor pan but under the
cabin.
Because of the disappearance of the front engine
compartment, it made the car more compact than any
other cars but simultaneously offers class-leading cabin
space
It provides exceptional crash-protection and no additional
crash structure is needed, thus a lot of weight is saved.