How to choose trapezoidal tooth and arc tooth timing belt， The difference between trapezoidal tooth and arc tooth timing belts
Timing belts are divided into two categories: Trapezoidal tooth timing belt and arc tooth timing belt，They have certain differences in structure and performance. Trapezoidal synchronous belts have a large load-bearing capacity and are suitable for high load transmission; arc tooth timing belts has high precision and stability and is suitable for occasions that require high transmission accuracy.
In the trapezoidal tooth timing belt transmission, the tooth top does not contact the pulley groove,
The belt teeth form a straight edge to produce a polygonal effect.，When the diameter of the trapezoidal toothed synchronous pulley is small, stress concentration is likely to occur at the tooth root, which will cause the trapezoidal toothed timing belt to The tooth shape deformation affects the meshing with the pulley teeth and easily produces noise and vibration, which is unfavorable for higher-speed transmissions. However, the trapezoidal tooth synchronous belt has large torque and load, so it is suitable for use in situations where low-speed transmission is relatively large , has the characteristics of simple structure, low manufacturing cost and wide application range.
The tooth tips of the arc-tooth timing belt are in contact with the tooth grooves, and the polygon effect is much smaller， The belt teeth and gear teeth mesh better, and the transmission accuracy is also higher.，It overcomes the shortcomings of the trapezoidal tooth timing belt and evens out the stress.， whether in main shaft drive or servo feed drive, always gives priority to arc-toothed timing belts.
The advantages of arc-toothed timing belts are smooth transmission, low noise, high transmission efficiency, and a transmission system with high accuracy requirements, which can meet high-precision transmission requirements. Arc-tooth timing belts transmit more power than trapezoidal-tooth timing belts and can prevent tooth interference during the meshing process. Arc-tooth timing belts are also slightly more expensive than trapezoidal-tooth timing belts.
There is a difference in service life between the trapezoidal tooth timing belt and the arc tooth timing belt. Because the trapezoidal tooth timing belt is involved in contact and the force-bearing area accounts for about 1/3 of the entire tooth flank, resulting in concentrated tooth root stress， will reduce the service life of the timing belt. The tooth design of the arc-toothed timing belt adopts an arc shape, which enables the timing belt to have good transmission effect and small transmission difference during the transmission process. Therefore, it can reduce tooth surface pressure and wear and extend the service life of the timing belt.
Trapezoidal teeth and arc teeth have their own performance characteristics，In actual applications, it is necessary to select a more suitable timing belt product based on the design characteristics of the mechanical equipment and the actual working environment to improve equipment performance reliability and reduced maintenance costs.
