【正文】
s, car tires outside diameter decreased by 25%, reducing the rim diameter of 35%, tires and rims, nearly doubling the width of the tire aspect ratio continuously decreased, cars up to 0. 5, racing up to , in particular The wide tires and highlevel car matches the more beautiful. Car tire production history of the development shows that the first 50 years mainly to resolve the issue of how to improve the life of the tire, in recent years, automotive and transportation sector increasingly demanding on the tires, tire to tire of the key driving performance, safety performance, fort and economic performance up, in short, the general trend of development of the tire is three, that is, of Meridian, tubeless, low profile technology. At present, the car tire has achieved this c and truck tires are to development in this area. 。 40 late Tubeless The emergence of the tire。s strong performance has been better, higher heat resistance of nylon, polyester cord replaced, and With the radial tire steel cord of development, and highly petitive. 1904, Matt created a carbon black reinforced rubber, largescale reinforced tread pound for use in tire cord after because before this, canvas than the damaged tread in the tire much quicker, carbon black the amount of pound growth soon, 30 years of raw rubber per 100 parts of carbon black used in 20, but also about this time mainly in the tread on the use of carbon black, matrix do not, and now has reached 50 or more. Mixed with carbon black before the tread of the tire running only about 6000km on the finish, and mixed with carbon black, the tire mileage soon be significantly improved. Now a group of truck tires can run about 100 000 km, in good roads, and even up to 200 000 km. 19131926, the invention of the cord and carbon black for tire technology, tire laid the foundation for industrial development. Standardization of the