mehran university of engineering and technology

1. Suspension system in automobiles
 Presenter
 Manohar lal
 Roll# 13ME46

2. What is suspension system
 Suspension is the term given to the system of
springs, shock absorbers and linkages that
connects a vehicle to its wheels
 Serve a dual purpose – contributing to the car's
handling and braking.
 Protects the vehicle itself and any cargo or
luggage from damage and wear

3. Introduction
 Vehicle chassis components
 Frame
 Shocks and springs
 Steering parts
 Tires, brakes, and wheels
 Suspension system
 Part of the chassis
 Many designs and many part names

4. Primary Functions of
Suspension
 Support vehicle weight.
 Keep the tires in contact with the road.
 Control vehicle’s direction of travel
 Maintain correct wheel alignment, important
in vehicle handling
 Reduce effect of shock loads with the use of
springs, dampers and bushings
 Maintain correct vehicle ride height

5. Cont:,
 Supports the vehicle and cushions the ride
 Holds tire and wheel in correct position
 Sprung weight
 Weight supported by car springs
 Powertrain, body, and frame
 Anything carried by the weight of springs
 Unsprung weight
 Reducing unsprung weight increases control
 Tires, wheels, brakes, bearings, axels, and
differential

6. Types Of suspension system
 Independent suspension system and
 Non-independent suspension system
Independent
Nonindependent

7. Independent Suspension
 Allows one wheel to move up and down with
minimal effect on the other wheels
 Each wheel is attached to its own suspension
unit
 Movement of one wheel does not cause
direct movement of the wheel on the other
side of the vehicle

8. Nonindependent Suspension
 Both left and right wheels are attached to
the same solid axle
 When one tire hits a bump in the road, its
upward movement causes a slight upward
tilt of the other wheel
 Neither wheel is independent of the other

10. Control Arms
 Used to hold the steering knuckle, bearing
support, or axle housing in position as the
wheel moves up and down
 The inner end contains bushings
 The outer end contains a ball joint
(independent) or bushing (solid axle)

11. Control Arm Assembly
Control arm bushings act as bearings

12. Strut Rod
 Fastens to the outer end of the lower control
arm and to the body or frame
 Keeps the control arm from swinging toward
the front or rear of the vehicle
 The rod ends contain rubber bushings that
soften the action of the rod and permit a
controlled amount of lower control arm front-
to-rear flex

13. Ball Joints
 Connections that allow limited rotation in
every direction
 Filled with grease for lubrication
 A grease fitting may be provided
 A grease seal holds grease in and prevents
water and contaminant entry
Steering knuckle for
front-wheel drive

14. Ball Joints
A tapered stud provides a force fit into the steering
knuckle or bearing support

15. Springs
 Support the load of the car
 Absorb the up-and-down motion of wheels
 Coil spring: most common spring used in
front and rear of passenger cars
 Variable rate spring: becomes stiffer as
compressed
 Smoother ride over small bumps
 Torsion bar spring: straight rod that twists
when working as a spring
 Mounted in the chassis

16. Springs (cont'd.)
 Leaf spring: long, flat strip of spring steel
rolled at both ends to accept rubber insulated
bushing
 As leaf spring is deflected it becomes stiffer
 Air spring: rubber air chamber attached by
tubing to an air compressor

17. Shock Absorbers
 Limit spring oscillations to smooth a vehicle’s
ride
 One end is connected to the body or frame, and
the other is connected to the axle or control arm
 When compressed or extended, oil inside the
shock is forced through small orifices, absorbing
energy and dampening spring action

18. Shock Absorber
This shock uses
pressurized gas to
reduce foaming in
the oil

19. Rear suspension system

20. Front suspension system

21. SUSPENSION SYSTEM – LAY OUT

22. Animations

25. Hope u will not
have any
Question.