A good toothed belt; timing belt; cogged belt; cog belt; or synchronous belt is usually a versatile belt with tooth moulded onto its internal surface. It is designed to run over coordinating toothed pulleys or sprockets . Toothed belts are found in a wide array of in mechanical gadgets, where high-power tranny is desired.
Toothed belts are used widely in mechanical products, including sewing machines ,photocopiers and many others. A major use of toothed belts is as the timing belt used to operate a vehicle the camshafts within an 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 travel 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 use of a quieter and better slower-acceleration 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 set belt pulley doesn’t have any teeth.
The tooth pulley can be used when accurate transmission of the torque is needed. Toned belt pulleys or V-belt pulleys cannot deliver 100% accurate tranny 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 specialize in engagement transmission
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