Tires for internal transport – the first area of large-scale use of polyurethane. Compared with rubber and steel polyurethane tires have a greater capacity. Table 1. Load capacity of tires the same diameter of polyurethane and natural rubber. Dimensions, mm Load capacity ratio comparison (polyurethane / rubber), polyurethane nc 558-203-406 * 17 237 2 499 4.9 457-127-308 8 391 1 174 7.1 406-76-308 3 773 548 7, 0 304-89-203 4 096 539 7.6 254-76-158 3 052 381 8.0 152-127-76 3 447 476 7.2 * The outer diameter of the metal rim on that fits over the tire. All polyurethane tires mentioned in Table 1. (152-558 mm.) Have a capacity of six times more than the tires of the same amount of natural rubber. Often poliuretanovaye tires make a smaller diameter, but with decreasing width, even more than twice the capacity of polyurethane tire is significantly higher than normal (Table 2).
Table 2. Payload massive tires from polyurethane and natural rubber. Polyurethane Natural rubber ratio comparison (polyurethane / rubber). dimensions mm capacity, kg dimensions mm capacity, kg 558-76-406 * 5 896 558-203-406 2 499 2.4 457-76-308 4 535 457-127-308 1 174 3.9 406-76 -308 3 764 406-127-308 1 052 3.6 330-76-254 3 061 330-127-254 571 5.3 254-76-158 3 050 254-177-158 1 097 2.8 152-50 -76 1111 2.3 152-127-76 476 * Outer diameter of the metal rim, which sit down bus. When designing freight transport based on the use of polyurethane tires are usually reduced and the width and diameter. Table 1 shows that the polyurethane tire size 254-76-158 (ie the outer diameter of the tire 254 mm., width 76 mm. and an outer diameter of the metal part of 158 mm.) has a greater capacity than a rubber tire with a size of 558-203-406.
For factories and warehouses with limited maneuver area reducing the diameter tires may be very beneficial. Thus, cost-effective fully utilize capacity polyurethane tires. In addition, the increased resistance of polyurethane to cuts and abrasion, causes a longer period of tires. Highly resistant to oils polyurethane tires will last longer in the machine shop (in a greasy floor). Compared with steel polyurethane tires provide better traction and harm concrete or other coatings. Polyurethane tire beneficial use and electric transport. They have much less rolling resistance than rubber (due to the different hardness materials). This allows less recharging batteries and more efficient use of transport. Industrial Vehicles used and in conditions of refrigerated warehouses where temperatures below 0 C. Solid polyurethane tire able to cut into the ice to form at this temperature, thereby improving traction. In addition, for such a dependence is characteristic of polyurethane elasticity on the temperature, which provide less need for power when operating buses in freezing temperatures than rubber tires of conventional rubbers. Thus, to increase the efficiency of the internal transport may be through the use of polyurethane tires. References 1. Wright, P., Cumming A. Polyurethane Elastomers. Trans. from English. Ed. Doc. Chem. Science N. . L., 'Chemistry', 1973. 2. S. Lipatov, Yu Yu Kerch, lm Sergeeva. Structure and properties of polyurethanes. Kiev, 'Naukova dumka', 1970.