Which of the following keys is used for connecting the pulley with shaft?

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Woodruff key
  2. Gib head key
  3. Flat saddle key
  4. Taper Key

Answer (Detailed Solution Below)

Option 2 : Gib head key
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Detailed Solution

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Explanation:

  • Gib head keys are specially manufactured machine keys with a projecting end that resembles the end of a gib and serves as a stop mechanism on a rotating shaft.
  • These keys are commonly used in engines and motors, gear reducers, transmissions, and motor shafts to hold pulleys and gears tightly to the rotating shaft.
  • Classification of keys:

Woodruff key

  • This is a semicircular key and it fits on to the shaft on which matching recesses are cut.
  • The top portion of the key projects out and fits in the keyway cut on the hub. 
  • This key is particularly useful in tapered fittings of shafts. 
  • It is a semicircular key used for transmitting light torque.

Hollow saddle key

  • One face of this key has a curvature to match with that of the shaft surface.
  • It has a taper of 1 in 100 and is driven in through the keyway.
  • The hub is held on the shaft due to friction.
  • This key is useful only for light-duty transmission.

Parallel key or feather key

  • This is the most commonly used key, used for transmitting unidirectional torque.

Taper and jib-headed key

  • It is used for transmitting more torque.
  • It is not good for high-speed applications.

Flat saddle key

  • This is considered to be stronger than the hollow saddle key.
  • This is not suitable for heavy-duty transmission.

 

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