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Which components apply and release the epicyclic members?

  • A.Selector forks moving dog clutch sleeves, exactly as in a manual gearbox but operated hydraulically instead
  • B.Synchroniser rings
  • C.Electromagnetic couplings, which lock the members together when energised by the transmission control unit
  • D.Multiplate clutches and brake bands

Answer: D

Hydraulically applied wet multiplate clutches connect members to one another and brake bands or clutches hold members to the casing, and the control system schedules them to give each ratio. One way clutches are used to simplify the changes. All of the elements are designed to slip briefly during the change, which is why the fluid specification matters so much. The shared behaviour explains why these belong together and the differences explain why both exist.

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