A good toothed belt; timing belt; cogged belt; cog belt; or synchronous belt is certainly a versatile belt with teeth moulded onto its inner surface. It is designed to run over matching toothed pulleys or sprockets . Toothed belts are found in several in mechanical products, where high-power transmission is desired.
Toothed belts are used widely in mechanical devices, including sewing machines ,photocopiers and many others. A major usage of toothed belts is really as the timing belt utilized to drive the camshafts in a vehicle or motorcycle engine.
As toothed belts can deliver more power than a friction-drive belt, they are utilized for high-power transmissions. These include the primary drive of some motorcycles , notably later on Harley-Davidsons ;and the supercharger used for dragsters .
Microlight aircraft driven by high-speed two-stroke engines such as the Rotax 532 use toothed belt decrease drives to allow the use of a quieter and more efficient slower-velocity propeller. Some amateur-built airplanes powered by automotive engines use cog belt reduction drive units.
A tooth pulley has some the teeth whereas a set belt pulley doesn’t have any teeth.
The tooth pulley is used when accurate transmission of the torque is necessary. Smooth belt pulleys or V-belt pulleys cannot deliver 100% accurate transmission of the torque because almost always there is some (hardly any – but still) slipping between your pulley and belt.
TOOTHED PULLEY 
/ TIMING BELT
Ever-power pulleys that focus on engagement transmission
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