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Pulley refers to a rotating driven device that holds the drive belt.

  • A drive belt is a continuous loop of reinforced rubber used to transmit power between two shafts. Three types are used to drive the water pump. These are the V-belt, the ribbed belt, and the toothed belt. The V-belt has a V-shaped cross-section that wedges into pulley grooves of matching width. Friction between the sides of the belt and the sides of the pulley grooves transmits the power. 
  • The ribbed or serpentine belt has a series of V-shaped ridges that act like a series of small V-belts. The ribs or ridges wedge into matching grooves in the pulleys.