PUSH- ROD SUSPENSION SYSTEM USED IN F-1

PUSH-ROD SUSPENSION SYSTEM IN F-1PRESENTED BY: ASHISH RAWATMahatma Gandhi Missions College of Engineering and Technology. Noida

GUIDED BY:Mr. PANKAJ KUMAR SINGHCONTENTSHistory.Introduction.Components of F-1 Car Suspension.Working of push-rod suspension system.Advantages of push rod suspension system.Dis-advantages of push-rod suspension system.Application.Conclusion.References.

HISTORYPull rods were first brought to Formula 1 by Gordon Murray with Brabham in the 70s. Now all formula one teams make use of the push rods, as pull rods are quite hard to implement in ahigh nosed car.Minardi and Arrows used pull rods with low noses to lower the centre of gravity. These two teams are a last two to use this concept.

INTRODUCTIONPush-rod as the name suggests the rod push up to therocker . In pull-rod the rod is pull down to the rocker .

PULL-RODPull rod set up has a strut from the outer end of the upper wishbones that runs diagonally to the lower edge of thechassis .

PUSH- RODA push rod is the opposite; the strut runs from the lower wish bone to the upper edge of thechassis.

PUSH-RODpush rod will flex with the wheel in bump. PULL-RODpull rod will flex in drop (wheel going down).

COMPONENTS OF AN F1 CAR SUSPENSION

Double wishbone arm.Pushrod/Pullrod.Rocker.Torsion bar.Heave spring.Track rod.ARB (Anti roll bar).4 way adjustable damper.

DOUBLE WISHBONE A-ARM Control wheel angle (camber and castor) and wheel movement.Type of double-A or double wishbone suspension.Wheel spindles are supported by an upper and lower A shaped arm.The lower arm carries most of the loadProvides Extra Support and control..

ROCKERSTransfers the vertical reciprocating movement of the push/pullrod into rotational movement at the torsion bar.

TORSION BARThe torsion bar acts as the spring that absorbs shock loads from the suspension movement.Its strength is controlled by the alloy mixture, its thickness and the length.

HEAVE SPRINGThe heave spring controls how stiff the car is when both sides of the cars suspension are compressed together for example under braking, or acceleration, or over a hefty bump.

TRACK RODThe track rods controls the steering of the wheel hubs.They are normally attached to the front of the wheel hub.

ANTI ROLL BAR (ARB)Basically it giving more resistance to chassis roll.Change understeer/oversteer characteristic of the car. The balance of the car can be fine-tuned by altering the stiffness of the ARBs.

4 WAY ADJUSTABLE DAMPERThese are fully adjustable dampers. They are adjustable in 4 ways. High and low speed bump, and high and low speed rebound.The softer the damper the easier it is to compress.

WORKING OFPUSH BAR SUSPENSION.

ADVANTAGES

Absence of bulky suspension system.Smooth flow of air through the sides of the vehicle.making it turbulent hence the aerodynamics of the vehicle is undisturbed.decreases air drag.you can modify motion ratio/spring ratio with the rocker.

DISADVANTAGESHigher CG (centre of gravity)Access to the dampers/springs can be more difficult.Another disadvantage is increased friction caused by the increased amount of bearings under high loads.

APPLICATION

Ferrari F300Mercedes F-1 w05McLaren hondaRenault

20CONCLUSIONA pushrod-type inboard suspension on a lightweight road race car.The pushrod are necessarily heavier than in pull-rod arrangement, the mass of the spring/damper units is located higher up,and the loads on the structure are more focussed and complex than with some alternative arrangements. Nevertheless this scheme is currently used by virtually all formula and indy cars and many other racers- simply because the spring/damper units are easily accessible for adjustments. REFRENCEShttp://www.formula1-dictionary.net/pushrod_pullrod.htmlhttp://www.f1-country.com/f1-engineer/suspension1.jpghttp://www.schuerkamp.de/zope/hoover/racing/historic_f1/images/ls17_b197_rear_susp.jpghttp://image.truckinweb.com/f/10091333+w750+st0/0809tr_03_z+1950_ford_f1_custom_truck+front_suspension_detail.jpghttps://www.youtube.com/watch?v=u6ssbkt7_kw&hd=1https://www.google.co.in/search?q=torsion+bar+in+f1&biw=1517&bih=714&source=lnms&tbm=isch&sa=X&ei=ZYUQVJSVMISwuASn8YKQBQ&ved=0CAYQ_AUoAQ&dpr=0.9#tbm=isch&q=four+way+adjustable+damper+in+f-1&imgdii=_

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