Classification of transmission belts
The flat belt is the oldest variety of transmission belts, with a history of more than 100 years, but until the middle of the 20th century, it still accounts for about half of the market share of the transmission belt. The utility model has the advantages of simple structure, convenient transmission, no distance limitation, easy adjustment and replacement, and the like, and is widely used in various industrial and agricultural machinery. The width of the flat belt is generally 16-600mm, the length is up to 100-200m, and the maximum number of layers is 6. The most common one is the canvas belt, which is divided into three types: cladding type, laminated type and stacked type. The laminated tape is an improved product of the cladding tape (also known as the round side belt), which has the advantages of softness, elasticity and good flexability, and is suitable for use on small pulleys and quick transmissions of 20 m/s or more. . The stacking strap is somewhere in between for the drive that is susceptible to wear on the sides. Since the transmission efficiency of the flat belt is low (generally about 85%) and the occupation area is large, the output of the world countries has been declining year by year since the 1960s. In developed countries, except for some agricultural machinery and textile machinery, which are still used in a small amount, they are already in a state of being eliminated. On the other hand, during this period, the jointless and hot joint endless belt made of chemical fiber canvas and cord as the core has made great progress in the world. It is characterized by high strength, low noise, smooth transmission, smooth transportation, flexing resistance, long life and no need for joints. The field of use is expanding and forming a mainstream in micro-drive belts.
With the rise of the high-tech industry, such micro-belts are commonly used in computer peripherals, office automation equipment, and labor-saving equipment. For example, automatic ticket gates, ticket vending machines, currency exchange machines, issuing machines, cash machines, bank settlement machines, automatic inspection machines, photocopiers, medical equipment, automatic packaging machines, fish detectors, etc., countries such as the United States, Japan, Europe, etc. It grows in double digits every year. This high-performance jointless flat belt has been developed into three types: polyurethane tape, polyurethane core tape and rubber canvas core tape. In the rubber micro-belt, in addition to chemical fiber canvas, there are special products using nylon diaphragm, aramid cord, glass fiber cord as core and surface rubber coated with chrome. They are essentially different from traditional canvas slabs. The specifications are very precise and the added value is very high. The world's major tape manufacturers are racing to develop and become high-tech products in the rubber industry. The V-belt, also known as the V-belt, is the most productive, wide-ranging and most versatile product in the transmission belt.
Since the first automobile roll belt made in the United States in 1917, it has been popularized for industrial and agricultural machinery since the early 1920s. It has been growing for more than half a century and has developed rapidly. It has become the mainstream of the transmission belt. In the world's transmission belts, from the point of view of rubber consumption, the V-belt now accounts for 65%, the toothed belt is 25%, and the flat belt has been reduced to less than 10%. The V-belt has become the main equipment for power transmission and shifting of various mechanical devices in the world. It plays an increasingly important role in many fields such as agricultural machinery, machine tools, automobiles, ships and office equipment. According to the section size, the V-belt can be divided into seven industrial models of industrial machinery for Y, O, A, B, C, D, and E, and various types of fan belts for automobiles and tractors. Y and O are the smallest V-belts, mainly used in office equipment such as typewriters and book cutting machines, and home appliances (washing machines, juicers, vacuum cleaners). General industrial machinery, with the increase of horsepower, sequentially use V-belts such as A, B, C, D, E, etc., D and E are heavy-duty belts, used for large machinery such as ships and electric power. As for the fan belt, in addition to cars and tractors, it is also widely used in pumps and air conditioners. In developed countries, the production ratio of the V-belt to the fan belt has reached 2:1-3:2, and the fan belt has shown a significant upward trend. The V-belts generally refer to the V-belts. Since the 1960s, in order to improve the durability of the belt, a V-belt has been introduced. This trimmed V-belt has been rapidly developed due to the fact that the side of the tape structure is not covered, the belt body is very soft, and the flexural fatigue resistance is very good. In the 1980s, in order to solve the problems of transmission efficiency and service life caused by the generation of different lengths of the V-belt in the group drive, a plurality of V-belts with the V-belts fixed together were brought up.