Rear Suspension Rear Suspension StylesStyles

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Rear wheel driveRear wheel drive

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Live AxleLive Axlewith leaf springswith leaf springs

• Wide leaf springs control side sway wellWide leaf springs control side sway well• A large amount of unsprung weightA large amount of unsprung weight• Leaf springs take up a lot Leaf springs take up a lot of spaceof space

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• For every action For every action there is an equal there is an equal & oposite reation & oposite reation

• When the wheels When the wheels turn clockwise, turn clockwise, the the rear axle the the rear axle housing trys to housing trys to turn turn counterclockwisecounterclockwise

• Axle wind up Axle wind up

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NoteNote

the axle is mounted off center on the the axle is mounted off center on the springspringThis helps prevent axle wind upThis helps prevent axle wind up

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Mounting one rear Mounting one rear shock in the front of shock in the front of

the axle and one the axle and one behind the axle helps behind the axle helps

to reduce wind up to reduce wind up and axle tramp and axle tramp

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Live AxleLive Axlewith coil springswith coil springs

• The upper control arms control lateral movement (side movement) The upper control arms control lateral movement (side movement) • The lower control arms control differential torque (wind up)The lower control arms control differential torque (wind up)

Side movement

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Watt’s LinkWatt’s LinkA Watt’s link allows the A Watt’s link allows the

suspension to travel up and suspension to travel up and down while preventing the down while preventing the axle from moving side to side.axle from moving side to side.

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Watt’s Watt’s Link Link used used on a on a

Mazda Mazda RX-7RX-7

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Diff. Housing

NoteNote. . .. . . single leaf spring single leaf springon independent suspension on independent suspension (RWD)(RWD)

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Trailing arm Trailing arm suspensionsuspension

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When the “A” shaped When the “A” shaped control arms control arms are mounted at an are mounted at an

angle, they are called semi-trailing angle, they are called semi-trailing control armscontrol arms

Used on Used on several several

sports carssports cars

Handles cornering Handles cornering loads betterloads better

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Multilink independent rear Multilink independent rear susp.susp.

NoteNote

Hydraulic Hydraulic mountmount

on this modelon this model

Superior noise Superior noise and vibration and vibration dampeningdampening

Hyd. mountNissanNissan

P-146P-146

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Rear suspensions Rear suspensions on front wheel drive vehicleson front wheel drive vehicles

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Semi-independentSemi-independentrear suspensionrear suspension

• The axle assemble twists, which gives the The axle assemble twists, which gives the semi-independent effectsemi-independent effect

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Semi-independentSemi-independentrear suspensionrear suspension

• The axle assembly acts as a sway barThe axle assembly acts as a sway bar• Track bar controls side movementTrack bar controls side movement

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Tracking bar Tracking bar with diagonal bracewith diagonal brace

Another Another style also style also

used with a used with a semi-semi-

independenindependentt

rear rear suspension suspension

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MacPherson strut MacPherson strut rear suspensionrear suspension

Is this Fords better idea???

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MacPherson strut rear MacPherson strut rear suspensionsuspension

Note. . . Note. . .

toe adjustmenttoe adjustment

ToyotaToyota

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Modified Modified MacPherson strut MacPherson strut rear suspensionrear suspension

Common on FWD vehiclesCommon on FWD vehicles

FordFord

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Double Double wishbone type wishbone type

rear rear suspensionsuspension

SomeSome models have models have flexable rubber flexable rubber

bushingsbushings

MazdaMazda

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Torque loads create Torque loads create bushing and control arm bushing and control arm deflection during deflection during braking, corning, braking, corning, acceleration and acceleration and deceleration.deceleration.

This causes a toe change to This causes a toe change to enhance straight line enhance straight line stabilitystability

Toe change during corning Toe change during corning leads to quickerand more leads to quickerand more responsive steeringresponsive steering