Take the core rubber synchronous belt is ordinary and special points, below the author is to introduce the two synchronous belt, to facilitate users to understand both the existence of some differences and understanding. Ordinary belt core rubber synchronous belt type: ordinary belt core rubber synchronous belt is the core of most used cord belt core, a few using flaps with core. Because the two core structure are fiber twist or establishment, in the operation of the rubber synchronous belt, shear in the belt between fiber core slowly breaking and elongation. So, use the cord belt core and flaps with core made of ordinary type rubber synchronous belt can be used only in low load of transmission system. Special type belt core rubber synchronous belt, special belt core rubber synchronous belt core using polymer polyester steel brown wire overall solid core rod core structure. For polyester steel brown wire is overall solid core without twisting structure, adhesion is very good, flexible, resistance strength is big, can't run long, not only in the very great degree increases the use fixed number of year of rubber transmission belt, and belt body balance of use fixed number of year, the company can achieve free maintenance, and regular update of replacement. Polyester steel brown wire skeleton material on November 22, 2010 by the expert committee of appraisal: take polyester steel brown wire as skeleton material of belt and general polyester cord, hard wire and aramid fiber rope structure skeleton materials belt compare, use fixed number of year increased 5 to 10 times as much, have to the international leading level. Special type belt core belt is very good deal with the high load heavy power transmission system in the update replace frequent problems of ordinary belt, very heavy industry companies around the world. By the 2 kinds of rubber synchronous belt is described respectively, believe that the reader can clearly find out some differences between them are different.