By-Anand Kulshreshtha

1416440030

ME-3A

Suspension is the system of tires, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two.

In early 1665 the leather springs were used

Then Elliptical Leaf Springs were came into with the rubber wheels in 1795

1919 Hydraulic shock absorber were used

Multi Link Suspensions in 1960

MacPherson struts in 1970s

Bose automative suspension in 2009

Hydraulic Cross link suspension in 2015

Springs Shockers Struts

• Guide motion of each wheel along (unique) vertical path relative to the vehicle body without significant change in camber.

•Mobility (DOF) analysis is useful for checking for the appropriate number of degrees of freedom,

Dof = 3(N – 1) – 2J – H

Where

N=number of links

J=number of binary joints

H=Higher Pair

Dependent Suspension System

Independent Suspension System

Dependent Suspension there is a rigid linkage between the two wheels of the same axle. A force acting on one wheel will effect the opposite wheel. For each motion of the wheel caused by road irregularities affects the coupled wheel as well.

Some Types of Dependent Suspension

Satchell link

Panhard Rod

Watt’s Linkage

WOBLink

Mumford linkage

Leaf Springs

This system means that the suspension is set-up in such a way that allows the wheel on the left and right side of the vehicle to move vertically independent up and down while driving on uneven surface.

A force acting on the single wheel does not affect the other as there is no mechanical linkage present between the two hubs of the same vehicle. In most of the vehicle it is employed in front wheels.

Some types of Independent Suspension

Swing Axle

Sliding Pillar

MacPherson Strut/Chapman Strut

Double wishbone

Multi-link suspension Fig-Double Wishbone Suspension

Fig-Multi Link Suspension

A multi-link suspension is a type of vehicle suspension design typically used in independent suspensions, using three or more lateral arms, and one or more longitudinal arms.

A wider definition considers any independent suspensions having three control links or more multi-link suspensions.

These arms do not have to be of equal length, and may be angled away from their direction.

Honda Accord 5 link suspension

Problems for the driver in handling of the vehicle at Uneven Roads

Poor response of Tyres during the bumps

Extra space required by the suspensions

Toyota Auris Multi Link Suspension

The arms have to control steer. This needs a pair of arms longitudinally separated.

The arms have to control camber, particularly the way that the camber changes as the wheel moves up (into bounce, or bump) and down into rebound or droop.

Multi link suspensionSystem

The arms have to react traction and braking loads, usually accomplished via a longitudinal link. They also have to control caster.

Top ViewRear View

Companies are working on cheap designs of Multi Link Suspensions

Reduction in number of links without hindering performance

Use of Magnetic Dampers

Application in the

racing applications

Renault Duster AWD

Audi A3 Cabriolet (2015)

Audi RS Q3

Lamborghini LP70

Volkswagen Tiguan

Audi uses Z shaped Multi Link Suspension

Renault Duster AWD Model uses a Torsion Beam with the Multi Link suspension

The best Independent Suspension system

The multi link is also advantageous for the designer who can alter one parameter in the suspension without influencing the entire assembly.

It take less space in comparison to others

It allows the suspension to flex more

Best handling ,efficiency and comfort handling

It is very Expensive

Complex Design

Difficult Manufacturing

Need a check by Analysis Software's like AMD etc

Use of composite materials for better Stability

The Computerized operated suspensions systems

Use of Electromagnetic waves in the suspensions

Predictive suspension System

THANK YOU