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Synchronous belt transmission is a kind of transmission method that combines the advantages of belt transmission, chain transmission and gear transmission. It has the advantages of friction type belt transmission, can maintain a constant transmission ratio, and the structure is simple, the transmission is stable, and it can buffer and absorb vibration. It can transmit power between large shaft spacing and multiple axes, and it has the characteristics of low cost, no lubrication, and easy maintenance. The belt's face is toothed and is an intermeshing drive that transmits motion and power by meshing multiple teeth between the teeth and the belt teeth. Belt drive can be divided into friction drive and meshing drive according to function. Friction drive includes: flat belt drive, V belt drive, multi-wedge belt drive, etc.; meshing drive has synchronous tooth belt (referred to as timing belt or tooth belt) transmission.
The belt drive utilizes belts that are tensioned on the pulleys, with their friction or meshing, to transmit motion or power between the two axes. According to the principle of belt transmission, the belt drive can be divided into friction type and meshing type. The former can be slipped by overload, but the transmission ratio is inaccurate. The latter can ensure synchronous transmission. It is called timing belt transmission. In recent years, the use of synchronous belt drives in food machinery has increased. Timing belts, also known as synchronous toothed belts, have trapezoidal tooth timing belts and arc tooth timing belts. Trapezoidal tooth synchronous belt working face is a trapezoidal tooth, the bearing layer is an endless belt of glass fiber rope core, steel wire rope, etc. The outer surface is coated with neoprene or polyurethane rubber. The working surface of arc tooth synchronous belt is arc tooth, the bearing layer is an endless belt of glass fiber and synthetic fiber rope core, and the outer surface is coated with neoprene.
The cross-section of the timing belt is rectangular, the belt surface has equidistant transverse teeth, and the pulley wheel surface is also made into a corresponding tooth shape. During operation, the tooth belt meshes with the gear teeth to drive, and there is no relative sliding between the belt and the pulley. Keep 2 rounds of peripheral speed synchronization. Synchronous belt drive has the following advantages:
(l) Constant transmission ratio;
(2) compact structure;
(3) Due to thin and light, high tensile strength, the belt speed can reach 40 s, the transmission ratio can reach 10, and the transmission power can reach 220kw;
(4) High efficiency, about 0.98;
(5) Less noise than gear transmission and chain transmission;
(6) Clean, no lubrication, simple maintenance;
(7) The tension force of the belt is small, and the pressure acting on the shaft and the bearing is small.
Compared with the traditional belt transmission, chain transmission and gear transmission, in the synchronous toothed belt transmission, the working surface of the timing belt has teeth, and the rim surface of the pulley also has a corresponding tooth groove, relying on the belt and the pulley. The meshing to transmit motion and power, without sliding, can guarantee a constant transmission ratio, and the pre-tightening force is small. Synchronous belt is thin and light, so it can be used for high-speed transmission, its strength, small elongation, transmission efficiency up to 98%, easy to use, wide range of uses, set belt, chain drive advantages in one. Therefore, it has wide application prospects in machinery, instrumentation, chemical industry, biomedical equipment, office automation equipment, and textile machinery.
After decades of development, the variety of synchronous belts has increased a lot. Different materials and different tooth types have provided different characteristics for synchronous belts, which can meet the needs of various products and occupy a great deal of practical applications. proportion.
Do you know how to choose when you purchase a timing belt?
When purchasing a product, the headache is often the problem of selection. How can we choose the product we are satisfied with? The following is analyzed by Shanghai Tiandun Electromechanical Equipment Co., Ltd.: