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Which behaviour does a viscous coupling show when heated by prolonged slip?

  • A.Hump mode in which it locks almost solidly
  • B.A progressive loss of torque capacity, since the fluid becomes less viscous as its temperature rises during use
  • C.No change
  • D.A reversal of the torque transfer, which sends the drive to the slipping wheel rather than to the gripping one

Answer: A

Rapid heating expands the fluid until the plates are forced into contact, producing a sudden large increase in torque known as hump mode. It provides a useful reserve of traction but stresses the driveline. Repeated humping shortens the life of the unit. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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