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Which two functions does a vehicle suspension perform?

  • A.Isolating the body from road shock and keeping the tyres on the road
  • B.Supporting the weight of the vehicle only, which is the whole of the duty performed by the springs and the dampers
  • C.Steering and braking
  • D.Absorbing the torque reaction of the engine and transmitting the drive to the road wheels through the axle shafts

Answer: A

The suspension must both insulate the occupants from irregularities and maintain tyre contact so that steering and braking forces can be developed. The two requirements conflict, since a soft spring rides well but controls the wheel poorly. Every design is a compromise between them. The order in which the effects act is what decides the outcome, so it is worth establishing first. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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