Views: 96 Author: Site Editor Publish Time: 2019-12-10 Origin: Site
A flat tire is a phenomenon in which a tire is deflated in a very short time (usually less than 0.1 seconds) due to a sudden burst of air loss. Flat tires are one of the frequent accidents of cars in summer. Most of them are caused by the car owner's improper maintenance of the tires. Next we will briefly introduce two reasons that lead to flat tires.
At present, the overload operation of domestic lorries is relatively common. A considerable number of people who engage in individual transportation believe that lorries are not profitable without overload. However, overload is one of the main causes of flat tires in lorries.
Nowadays, domestically produced and used lorries generally use high-pressure tires, and large-capacity rear wheels generally use double tires. Under normal circumstances, when the load on the wheel is at the maximum allowable value, the internal pressure of the high-pressure tire is 5-7 atmospheres. When the actual load of the lorries exceeds the maximum allowable load of the wheel, the internal pressure of the tire will increase. When the internal pressure of the tire exceeds the sealing pressure of the tire valve, it will cause the tire to leak. If one of the rear wheels with a large bearing capacity leaks and the driver fails to find it in time, it will cause tire burst. In addition, after the lorry has used the brake for a long time, the brake drum will gradually generate high temperature. Because the lorry tire valve is close to the inner middle of the tire rim, and it is very close to the brake drum. The high temperature generated by the brake drum will expand the rubber at the bottom of the valve and it will become deterioration and have poor sealing. Those lorries that often travel in mountainous and hilly areas have to use the brakes often for a long time. The tire valve seal is generally poor, so the probability of flat tires is higher.
Common models of flat tires caused by over-speed are small passenger cars, especially high-performance limousines. On the highway, some high-performance limousines can reach speeds of more than 110 kilometers per hour. When high-quality limousines with similar performance overtake each other on the highway, their speed is higher.As for the low-pressure tires commonly used in modern cars, when the load on the wheels is at the maximum allowable value, the internal pressure of the tires is between 2.5 and 2.4 atmospheres. When the car is driven at high speed for a long time, the tires and the ground get severe friction and generate a large amount of heat, when the heat accumulates to a certain extent, it can cause the tire itself to become hot. The bad effects of high temperature on tires have two aspects. One is that the tire itself is inflated and the pressure resistance is poor, the other is that the air in the tire is inflated and the internal pressure of the tire is increased. In addition, when a car tire maintains a high-speed running state for a long time, the contact surface between the tire and the ground remains relatively stable for a long time, and the tire strain surface is difficult to adjust. After maintaining this state for a long time, it is very easy to cause flat tires.
The excellent performance of the car and the length of the tire's service life are affected by the tire pressure. According to SAE (Society of Automotive Engineers in the United States), there are more than 260,000 traffic accidents caused by tire failures and 70% of highway accidents caused by flat tires. In addition, natural leakage or inflated tires are the main cause of flat failures. About 75% of tire failures occur each year. The data also shows that in high-speed driving, flat tires caused by tire failures are important causes of frequent traffic accidents.
This invisible killer has caused many tragedies and caused incalculable economic losses to the country and businesses. Therefore, in order to reduce the occurrence of traffic accidents caused by flat tires, the US federal government requires automakers to accelerate the development of TPMS ( Tire Pressure Monitoring System).
