In the case of high-speed rotation of the pulley, the meshing teeth between the belt and the pulley enter or exit the meshing state at a high frequency, causing the air at the tooth groove to compress or relax, resulting in air noise.

(1) The wider the width of the silencing groove in the circumferential direction of the synchronous belt pulley, the longer the airflow path, and the greater the pressure change of the gas, resulting in greater noise. Therefore, it is hoped that the width of the synchronous belt pulley and belt is as narrow as possible, but the width of the synchronous belt is approximately proportional to the transmitted power. In order to achieve the designed power, the pulley and belt must have a certain width. To overcome this contradiction, grooves can be made in the circumferential direction of the pulley to allow air to be smoothly discharged through the grooves, thereby reducing noise. Experiments have shown that this method can reduce noise by 3-5 dB.

(2) If you want to further reduce the aerodynamic noise of synchronous belt transmission, you can also use a synchronous belt wheel with a radial silencing groove.

When slotting,attention please :

① The groove cannot be opened too deep or wide, otherwise it will affect the transmission power

② The distribution of grooves should be uniform to avoid disrupting the balance of the pulley.

③ Sharp cuts and burrs must be eliminated at the slotted area to avoid damaging the teeth of the synchronous belt.

(3) Conclusion

After the above processing, the noise of the machine tool will be significantly improved, and the maximum speed of the spindle synchronous belt drive can be increased from 6000r/min to over 8000r/min.