Synchronous belt classification

Synchronous belt teeth have trapezoidal teeth and arc teeth. There are three types of arc teeth: arc teeth (H series also known as HTD belts), flat top arc teeth (S series also known as STPD belts) and concave top parabolic teeth (R series).

Trapezoidal tooth synchronous belt

Trapezoidal toothed synchronous belts are divided into single-sided with teeth and double-sided with teeth, referred to as single-sided belt and double-sided belt. Double-sided belts are divided into symmetrical tooth type (code DA) and staggered tooth type (code DB) according to the arrangement of the teeth. The trapezoidal tooth synchronous has two size systems: pitch system and modular system.

curved tooth synchronous belt

Curved tooth synchronous belt has the same structure as the trapezoidal tooth synchronous belt except that the tooth profile is curved. The belt pitch is equivalent, and its tooth height, tooth root thickness and tooth root fillet radius are larger than trapezoidal teeth. After the belt tooth is loaded, the stress distribution is better, the stress concentration at the root of the tooth is smoothed, and the bearing capacity of the tooth is improved. Therefore, the spiral tooth synchronous belt transmits more power than the trapezoidal tooth synchronous belt, and can prevent the interference of the teeth during the meshing process. The spiral toothed synchronous belt has good wear resistance, low noise during operation, no lubrication, and can be used in harsh environments with dust. It has been widely used in food, automobile, textile, pharmaceutical, printing, papermaking and other industries.

5. Working principle of synchronous belt:

The synchronous belt drive is composed of an endless belt with equidistant teeth on the inner peripheral surface and a pulley with corresponding teeth. During operation, the belt teeth mesh with the tooth grooves of the pulley to transmit motion and power. It is a comprehensive belt A new type of belt transmission with the advantages of transmission and chain transmission and gear transmission. Precautions for the installation and use of timing belts and timing wheels: Reduce the center distance of the pulleys. If there is a tension pulley, loosen it first, and then adjust the center distance after installing the belt. For transmission with a fixed center distance, remove the pulley first, install the belt on the pulley, and then install the pulley on the shaft to fix it.

You should also pay attention to the following points when installing:

①When installing the timing belt, if the center distance of the two pulleys can be moved, the center distance of the pulleys must be shortened first, and then the center distance is reset after the timing belt is installed. If there is a tension wheel, first relax the tension wheel, then install the timing belt, and then install the tension wheel.　　②When installing the timing belt on the pulley, remember not to use too much force or use a screwdriver to pry the timing belt hard to prevent the tensile layer in the timing belt from breaking unnoticeably. When designing the pulley, it is best to choose a structure that allows the two shafts to move closer to each other. If the structure does not allow it, it is best to install the timing belt and the pulley on the corresponding shaft.

③Control the proper initial tension.

④ In the synchronous belt drive, the parallelism of the axis of the two pulleys is required to be relatively high, otherwise the synchronous belt will deviate when working, or even jump out of the pulley. The non-parallel axis will cause uneven pressure, which is the early wear of the belt teeth.

⑤The frame supporting the pulley must have sufficient rigidity, otherwise the two axes will be non-parallel when the pulley is running in the code lock.