Synchronous belt drive is composed of an inner circle surface which has a seal ring belt and its corresponding pulley with equal distance gear. While in motion, belt tooth and tooth groove of pulley bite transmit motion and dynamic force. It's a bite transmission, thus has respective advantages of gear drive, chain drive and belt drive, (see attached table) Timing belt drive has accurate transmission ratio; with no slip. It may obtain constant speed ratio, absorb vibration. It's of stable transmission; low noise; large transmission ratio scope which may normally reach to 1:10. Allowable linear speed may reach to 40m/s. It's of high transmission efficiency which may normally reach to 98%-99.5%. It transmits power from several watt to hundreds of thousands watt. Its compact structure is also suitable for multi-axle drive. It's of small tension and non-pollution. It needs no lubrication, therefore it may work normally under occasions which don't allow pollution and has awful working environment. It's widely applied in auto, tobacco, textile, chemical & light industry, metallurgy, instrument & meter, mine, petroleum, machine tool etc mechanical device drive arrangements.
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