1. Tire is an annular elastic rubber product assembled on various vehicles or machinery and rolling on the ground. 1845, R·w· Thomson, a Scottish-born civil engineer, invented pneumatic tires, and obtained a patent from the British government. The patent name was "Wheel Improvement of Carriage and Other Vehicles".
2. In the same year, the first pneumatic tire was born in 65438+February 65438+February. Tires are usually installed on metal rims, which can support the car body, buffer external shocks, achieve contact with the road surface and ensure the driving performance of the vehicle.
3. Tires are often used under complicated and harsh conditions. They are subjected to various deformations, loads, forces and high and low temperatures during driving, so they must have high bearing performance, traction performance and cushioning performance. At the same time, it also requires high wear resistance and bending flexibility, as well as low rolling resistance and heat generation.
4. Car tires-tires installed on cars are mainly used for high-speed driving on good roads. The maximum running speed can reach more than 200 km/h, which requires comfortable riding, low noise, good maneuverability and stability.
Methods to distinguish the quality of different types of tires;
1, bias tire: the carcass ply and buffer layer of bias tire cross each other and are arranged at an angle less than 90 with the center of the crown. Its specifications are expressed by "×× -×××" die marks, such as 6.50- 16, 9.00-20, etc. Skew tire carcass skeleton material is multi-layered, the tire outer edge size changes greatly before and after inflation, and the rolling circumferential deformation is large, which is not wear-resistant and stab-proof, and is not suitable for high-speed long-distance driving.
2. Radial tire: The carcass ply cords of radial tire are arranged at an angle of 90 degrees or close to 90 degrees with the center line of the crown, and are fixed on the carcass with belts. Its specifications are indicated by the stamp "××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××
Radial tire carcass skeleton material layer is few, and the tire carcass is tensioned by steel wire belt layer, so the tire outer edge size changes little before and after inflation, the rolling circumferential deformation is small, the wear resistance and stab resistance are low, and the energy consumption is low, so it is suitable for high-speed and long-distance operation.
3. Full-standard tires: Full-standard tires refer to tires produced by tire manufacturers, which have been tested by the quality inspection department of the enterprise against the corresponding national standards or enterprise standards, and all indicators meet the standard requirements.
On the tire sidewall, the mold marks of factory name, trademark, specification, standard rim, production license number, production number and related quality marks are clear and complete, and there is no smearing, knife scraping and other phenomena. However, the quality of tires with smearing or scratching is not guaranteed.