Sliding mesh gear box

An obsolete type of transmission or gearbox in which the gears on the layshaft are fixed to the shaft rigidly, whereas the gears on the main shaft can slide on it by means of splines but are otherwise in permanent rotational mesh with the shaft.


  1. main drive gear
  2. counter shaft
  3. main shaft
  4. I gear
  5. II gear
  6. III gear
  7. top speed engaging dogs

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