A toothed belt; timing belt; cogged belt; cog belt; or synchronous 
belt can be a versatile belt with the teeth moulded onto its internal surface. It is designed to run over matching toothed pulleys or sprockets . Toothed belts are used in several in mechanical gadgets, where high-power transmission is desired.
Toothed belts are utilized widely in mechanical gadgets, including sewing machines ,photocopiers and many others. A major utilization of toothed belts is really as the timing belt utilized to drive the camshafts in a automobile or motorcycle engine.
As toothed belts can deliver more power when compared to a friction-drive belt, they are used for high-power transmissions. Included in these are the principal 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 make use of toothed belt decrease drives to allow the use of a quieter and more efficient slower-speed propeller. Some amateur-built airplanes run by automotive engines make use of cog belt reduction drive units.
A tooth pulley has some teeth whereas a flat belt pulley doesn’t have any teeth.
The tooth pulley is utilized when accurate transmission of the torque is needed. Flat belt pulleys or V-belt pulleys cannot deliver 100% accurate transmission of the torque because there’s always some (hardly any – but nonetheless) slipping between your pulley and belt.
TOOTHED PULLEY / TIMING BELT
Ever-power pulleys that focus on engagement transmission