A toothed belt; timing belt; cogged belt; cog belt; or synchronous belt can be a flexible belt with tooth moulded onto its internal surface. It really is designed to run over matching toothed pulleys or sprockets . Toothed belts are used in several in mechanical products, where high-power transmission is desired.
Toothed belts are used widely in mechanical products, which includes sewing machines ,photocopiers and many more. A major utilization of toothed belts is as the timing belt used to operate a vehicle 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. These include 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 like the Rotax 532 use toothed belt reduction drives to allow the use of a quieter and more efficient slower-acceleration propeller. Some amateur-built airplanes driven by automotive engines make use of cog belt decrease 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. Toned 
belt pulleys or V-belt pulleys cannot deliver 100% accurate transmitting of the torque because there’s always some (very little – but nonetheless) slipping between your pulley and belt.
TOOTHED PULLEY / TIMING BELT
Ever-power pulleys that specialize in engagement transmission