What are the tires of cars?
According to inflatable pressure is divided into: ① high-pressure tires. Inflation pressure is generally 5.5 kg / cm 2 or more, stiffness, poor cushioning performance, has been rarely used. Low pressure tires. Inflation pressure is generally 2 to 5.5 kgf / cm 2. With the strength of the cord and the tire carrying capacity of some tires inflated pressure of more than 5.5 kgf / cm 2, but its buffer performance and low-pressure tires close, is still low-pressure tires. ③ ultra low pressure tires. The inflation pressure is generally less than 2 kgf / cm 2.
(D), cross-section width (B) and bead inner diameter (d) are the main specifications of the tire and are generally marked on the sideways. The high-pressure tire is represented by D × B; the low-pressure tire is represented by B-d. The sidewall also uses the code to mark the carcass cord type. In China, with M said cotton cord; with R said artificial silk cord; with N said nylon cord; with G said steel cord general structure; with Z said radial structure. In addition, the sidewall also marked tire pressure, maximum load, ply number, label, manufacturing date and so on.
According to the purpose is divided into passenger tires and tires. ① passenger tires: for the inflation pressure of 4 kg / cm 2 low-pressure tires, ply is generally 4 to 6 layers, bead diameter is generally below 16 inches. Passenger tires for cars and light trucks. Passenger tires are moving in the direction of ultra low pressure. ② tire tires: for the inflation pressure of 4 kg / cm 2 or more low-pressure tires, ply is generally 10 to 16 layers, bead diameter is generally 16 to 32 inches. Tires are used for medium and heavy duty trucks, buses and trolley buses.
According to the carcass structure is divided into: ① ordinary structural tires. The cords of the ply are laminated in a crossed form, the carcass is strong and the lateral rigidity is good, but the cushioning performance is poor. ② radial tire structure. The cords of the carcass are arranged in the form of meridian, orthogonal to the outer circumference of the tire, and the strength is fully exerted. Radial structure tires than ordinary structural tires rolling resistance is small, good cushioning performance, long mileage.
According to the tread pattern is divided into: ① ordinary pattern tires. There are many styles of portrait, horizontal and both. Ordinary horizontal treads are suitable for use on poor and gravel pavements; longitudinal tires are suitable for use on better pavements; tires with longitudinal and horizontal tiles are suitable for use on general pavement and poor pavement. ② cross-country pattern tires. Tread has a large pattern, suitable for mining, site, desert, loose ground and snow mud road use. ③ mixed tires. Both for good pavement, but also for gravel pavement and loose road.
