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Which final drive arrangement suits a transverse engine?

  • A.Parallel helical gears within the transaxle
  • B.A hypoid bevel set, which is required in order to turn the drive through ninety degrees towards the road wheels
  • C.A worm and wheel
  • D.A spiral bevel set without offset, which combines the strength of a bevel gear with the efficiency of a spur gear

Answer: A

With the engine across the vehicle the drive already runs in the right direction, so a simple pair of helical gears provides the reduction. No direction change is needed. The arrangement is more efficient than a hypoid set and needs no extreme pressure oil. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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