Drive Belts transfer the rotation of the crankshaft to other devices such as the alternator, air conditioning compressor, and mechanical driver water pumps. A flexible is used for this application and requires regular inspection and replacement according to the User Manual.
A drive belt is a continuous loop of reinforced rubber used to transmit power in between two shafts. These types of belts 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 as a series of small V belts, The ribs or ridge wedges into matching grooves in the pulley. Friction between the sides of the small ridges and grooves transmits the power. Some older engines needed four to five V-belts to drive all the engine-driven devices. Newer engines have a single serpentine belt to transmit greater power.
The toothed belt drove the water pump with a sprocket instead of a pulley.