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Keyways are still the most common of all joints between shaft and hub. Compared to other "form locking joints" as polygon profiles the key and keyway is:

  • cheap to manufacture
  • well standardized

The disadvantages are:

  • axially it must be locked by an extra device in order to transmit axial force
  • alternating loads give a play and risk for breakage/fatigue
  • very difficult to dismantle -
  • the shaft is weakened by the keyway
  • just use part of the shaft for torque transfer
  • increased unbalance of the shaft
  • difficult to calculate and thereby over dimensioned

 

Read the full story here...

T-M-Keyway-joints.pdf

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