There are two types of synchronous belt teeth: trapezoidal teeth and arc teeth. There are three types of arc teeth: arc teeth (H series is also called HTD belt), flat topped arc teeth (S series is also called STPD belt) and concave topped parabolic teeth (R series).
Trapezoidal toothed synchronous belt
Trapezoidal toothed synchronous belts are divided into single-sided toothed belts and double-sided toothed belts, which are called single-sided belts and double-sided belts for short. The double-sided belt can be divided into symmetrical tooth type (code DA) and staggered tooth type (code DB) according to the arrangement of teeth.
The trapezoidal gear synchronizer has two size systems: pitch system and module system. The pitch system is adopted in China, and the corresponding standards of synchronous belt drive GB/T 11361 ～ 11362-1989 and GB/T 11616-1989 are formulated according to ISO 5296.
Helical tooth synchronous belt
Except that the tooth shape of the spiral tooth synchronous belt is curved, its structure is basically the same as that of the trapezoidal tooth synchronous belt. The pitch of the belt is equivalent, and its tooth height, tooth root thickness and tooth root fillet radius are larger than those of the trapezoidal tooth synchronous belt. After the belt tooth is loaded, the stress distribution is good, which smoothes the stress concentration of the tooth root and improves the bearing capacity of the tooth. Therefore, the arc tooth synchronous belt transmits more power than the trapezoidal tooth synchronous belt, and can prevent tooth interference in the meshing process.
The arc tooth synchronous belt has good wear resistance, low noise when working, no lubrication, and can be used in the harsh environment with dust. It has been widely used in food, automobile, textile, pharmaceutical, printing, papermaking and other industries.
