The document discusses different types of automobile chassis structures. It describes ladder frames, which resemble two longitudinal rails linked by cross-members and provide rigidity but lower torsional strength compared to other designs. Tubular space frames use welded circular and square tubes arranged in three dimensions for strength from any direction but are more complex. Monocoque designs form a single welded structure that is efficient for mass production but heavier. Newer designs use aluminum, carbon fiber, and sandwich composites to achieve strength and lightweight rigidity.

1. BY
KALYAN SRIKAR MAJETI

2. CONTENTS……
 Chassis introduction
 Types of chassis
 Different types of latest structures
 Various cars and their chassis

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

5. Ladder chassis

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…..

8. Backbone chassis

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

11. Monocoque chassis

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

14. Tubular space frame chassis

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

19. Carbon fibre monocoque
chassis

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.