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Which members make up an epicyclic gear set?

  • A.A sun gear, planet gears on a carrier, and an annulus
  • B.Two shafts carrying constant mesh gear pairs, one of which is held stationary in order to obtain each of the ratios
  • C.A worm and a wheel
  • D.An input and an output shaft connected by a chain running over sprockets of different sizes on each of the shafts

Answer: A

The central sun gear meshes with several planets carried on a rotating carrier, and the planets also mesh with an internally toothed annulus surrounding them. Holding any one member and driving another gives a different ratio. Locking two members together gives direct drive. 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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