The dimensions, specifications and models of the pulley are as follows:

1. Belt drive mainly includes: flat belt, V-belt and synchronous toothed belt. All three belts have national standards. However, due to the large change of transmission ratio and power, there is no corresponding national standard or national standard, which can not cover all contents, but the national standard determines the selection scope, design method and so on.

2. Pulleys are mostly V-belts. The specifications of pulleys in various countries are A, B, C, D, E, O and other models, which are determined according to the back width and different sizes of pulleys: Type A pulley has a width of 12.5mm, a height of 9mm, a top width of 13 mm and a thickness of 8mm; The width of the B pulley is 16.5mm and the height is 11mm.

3. Type D wheel has a width of 22mm, a height of 14mm, a top width of 22 mm and a thickness of 13.5mm; Type D pulley is 21.5mm wide, 19 mm high, 21.5mm high and 19 mm thick; The width of E-type pulley is 25.5mm and the thickness is 19mm; The width of E-type pulley is 25.5mm, the height is 38mm, and the height is 25.5mm; the width of the E-type pulley is 38 mm and the thickness is 25.5mm;

Expansion: The diameter and other dimensions of the pulley are matched according to the reduction ratio, and are designed according to the working speed and the speed of the motor. Working speed/motor speed = driven wheel diameter/driving wheel diameter * 0.98 (sliding coefficient). If steel pulley is used, the linear speed is required to be not higher than 40 m/s. If cast iron is used, the linear speed is required to be not higher than 35 m/s. The conversion ratio of motor speed to pulley diameter, speed ratio = output speed: input speed = load pulley pitch circle diameter: motor pulley pitch circle diameter.