The synchronous belt drive is composed of a closed annular tape with equidistant teeth on the inner surface (the material of timing belt: rubber and PU/polyurethane) and corresponding pulleys. When the transmission is working, the teeth of the synchronous belt mesh with the tooth slots of the pulley to transmit motion and power, so it has various advantages of gear transmission, chain transmission and belt transmission. The synchronous belt drive has an accurate transmission ratio, no slip, can obtain a constant speed ratio, stable transmission, shock absorption, low noise, and a large transmission ratio range, generally up to 1:10, and the allowable linear speed can reach 40m/s. The transmission efficiency is high, generally reaching 98%-99%. Delivering power from a few watts to hundreds of kilowatts. The compact structure is also suitable for multi-axis transmission, with low tension force, no lubrication, and no pollution, so it can work normally in situations where pollution is not allowed and the working environment is relatively harsh.