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Which function does a propeller shaft perform?

  • A.It carries the drive from the gearbox to the final drive
  • B.It carries the drive from the differential outward to each of the two road wheels of the driven axle behind
  • C.It supports the rear axle
  • D.It absorbs the torsional vibration of the crankshaft before that vibration is able to reach the gearbox input

Answer: A

The propeller shaft transmits torque from the gearbox output to the final drive pinion while accommodating the movement of the axle on its suspension. Half shafts carry the drive outward from the differential to the wheels, which is a separate stage. The shaft must also accommodate a change of length as the axle rises and falls. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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