A toothed belt; timing belt; cogged belt; cog belt; or synchronous belt is a versatile belt with tooth moulded onto its inner surface. It is designed to run over coordinating toothed pulleys or sprockets . Toothed belts are used in a wide array of in mechanical devices, where high-power transmitting is desired.
Toothed belts are used widely in mechanical gadgets, which includes sewing machines ,photocopiers and many others. A major usage of toothed belts is as the timing belt utilized to drive the camshafts in a automobile or motorcycle engine.
As toothed belts can deliver more power than a friction-travel belt, they are used for high-power transmissions. Included in these are the primary drive of some motorcycles , notably afterwards Harley-Davidsons ;and the supercharger used for dragsters .
Microlight aircraft 
driven by high-speed two-stroke engines like the Rotax 532 make use of toothed belt reduction drives to allow the usage of a quieter and more efficient slower-quickness propeller. Some amateur-built airplanes driven by automotive engines make use of cog belt reduction drive units.
A tooth pulley has some tooth whereas a set belt pulley doesn’t have any teeth.
The tooth pulley is used when accurate transmission of the torque is necessary. Flat belt pulleys or V-belt pulleys cannot deliver 100% accurate transmission of the torque because there’s always some (very little – but nonetheless) slipping between the pulley and belt.
TOOTHED PULLEY / TIMING BELT
Ever-power pulleys that focus on engagement transmission
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