A timing belt is toothed belt also called cogged belt is a non-slipping mechanical drive belt. It is made as a flexible belt with teeth moulded onto its inner surface. It runs over matching toothed Timing pulleys or sprockets. For more information on pulleys and sprockets visit their pages .
When correctly tensioned, they have no slippage and are often used to transfer motion for indexing or timing purposes .They are often used in lieu of chains or gears, so there is less noise and a lubrication bath is not necessary
V belts solve the slippage and alignment problem. It is now the basic belt for power transmission. They provide the best combination of traction, speed of movement, load of the bearings, and long service life. They are generally endless, and their general cross-section shape is roughly trapezoidal (hence the name “V”). The “V” shape of the belt tracks in a mating groove in the pulley (or sheave), with the result that the belt cannot slip off. The belt also tends to wedge into the groove as the load increases—the greater the load, the greater the wedging action—improving torque transmission and making the V-belt an effective solution, needing less width and tension than flat belts. V-belts trump flat belts with their small center distances and high reduction ratios