Synchronous belt is a kind of transmission device, in the midst of a lot of mechanical equipment used is the way of transmission and the reason it will be used in the transmission of many devices, the main reason is the thought that it can obtain very good transmission effect, taking advantages of drive each other in terms of transmission. Said a combination of other synchronous belt drive their respective advantages, because it is composed of a root of tooth surface with spacing within weeks of circular belt and with appropriate match round, with such institutions as well as the application of the working principle of the integrated belt drive, chain and gear drive their respective advantages. When using synchronous belt rotation, with toothed wheel tooth mesh to transfer the power, must be very precise in transmission ratio, there will not be without the slip, can get constant speed ratio, present the transmission effect of smoothly, also can absorb vibration noise, transmission ratio range will be very large. Visible, do a combination of other synchronous belt transmission of their respective advantages, relying on these advantages, it can be used in the present a very good transmission effect, and to effectively optimize the operation of the equipment, so it was only used in a lot of machinery and equipment, application is very extensive in transmission.