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Which gear pair is used in a longitudinal final drive?

  • A.A chain and sprocket, which allows the final drive ratio to be altered readily by changing the sprocket sizes
  • B.A hypoid bevel pinion and crown wheel
  • C.A pair of parallel helical gears, which is the arrangement used in a transverse transaxle instead of bevel gears
  • D.A worm and wheel

Answer: B

The hypoid set turns the drive through a right angle and provides the reduction, with the pinion offset below the crown wheel centre. That offset lowers the propeller shaft and the transmission tunnel. It also introduces sliding contact requiring extreme pressure lubrication. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist.

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