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The effect of creep in belt drive is:
1. Reduce the velocity of driver pulley
2. Increase the velocity of driven pulley
3. Reduce the velocity of driven pulley
4. Increase the velocity of driver pulley

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Correct Answer - Option 3 : Reduce the velocity of driven pulley


  • Creep is the tendency of a solid material to move slowly or deform permanently when it is subjected to long-term exposure of high levels of stress that are still below the yield strength of the material.
  • When a belt rotates through two pulleys, the upper side of this drive will be in tension i.e. tight side and the lower side will in compression i.e. slack side.
  • In pulley rotation certain portion of the belt will pass through the area where it will change from tight side to slack side, then the length of that specific portion of the belt will expand and contract subsequently and a relative motion will happen between the belt and pulley surface. This phenomenon is called creep of the belt.
  • This motion of belt relative to driving and driven pulley due to unequal stretching of the two sides of the drive is known as creep.
  • The total effect of creep is to reduce slightly the speed of the driven pulley or follower.

Difference between slip and creep.

  • Creep is due to the elastic property of the belt whereas, the conventional slip is due to insufficient frictional grip between the belt and pulley.
  • However, the effect of the creep, as well as slip, is to reduce the speed ratio, and hence power transmission.

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