Rear Suspension Systems

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Rear Suspension Systems
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Live-Axle
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Live-Axle with Leaf Springs (Hotchkiss)

• Leaf springs control side sway
• A large amount of un-sprung weight
• Take up a lot of space

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Rear Axle Torque Reaction

• Axle Wind-up

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• Note
• The axle is mounted off center on the spring
• Helps prevent axle wind-up

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Also.

• Mounting one rear shock in the front of the axle
  and one behind the axle helps to reduce wind up
  and axle tramp

OFF-SET SHOCK DESIGN
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Live-Axle with Coil Springs

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

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Trailing Arm
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A shaped control arms mounted at an angle,
called semi-trailing control arms
Used on many sports cars. Handles cornering
loads better
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Multilink Independent Rear Suspension

• Note
• Hydraulic mount
• Superior noise and vibration dampening

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Rear Suspension SystemsOn FWD Vehicles
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Semi-Independent

• The axle assemble twists, gives semi-independent
  effect
• The axle assembly acts as a sway bar
• Track bar controls side movement

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Tracking Bar with Diagonal Brace

• Both prevent lateral (side) axle movement.

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Independent Rear with MacPherson Struts

• Caster Toe adjustable
• Improved ride quality, steering control, tire
  life, traction
• Lighter

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Independent Rear with Shocks

• Toe is adjustable
• Camber is not

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Camber Toe Adjustments
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Transverse Mono Leaf Spring

• Fiberglass
• Lightweight
• Compact
• High tension

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Transverse Mono Leaf Spring
Tie Rods
Trailing Arm
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Double Wishbone

• Torque loads create bushing and control arm
  deflection during braking, corning, acceleration
  and deceleration.
• This causes a toe change to enhance straight line
  stability
• Toe change during corning leads to quicker and
  more responsive steering