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Which gearbox type slides gears into and out of mesh?

  • A.The synchromesh gearbox
  • B.The epicyclic gearbox, whose ratios are obtained by holding different members of the planetary gear set stationary
  • C.The sliding mesh gearbox
  • D.The constant mesh gearbox, in which all of the gear pairs remain permanently engaged with one another at all times

Answer: C

The earliest gearboxes slid straight cut gears along splined shafts into engagement, which required the driver to match the speeds by double declutching. Any mismatch clashed the teeth and damaged them. Constant mesh and synchromesh designs superseded it. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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