First, what should pay attention to inflating automobile tires?
1, inflate should pay attention to safety. Always check the air pressure with a barometer to prevent excessive inflation and tire blasting. 2. After driving is stopped, it is necessary to wait for the tire to cool and then inflate. Because the temperature of the tire will increase when the vehicle is driving, it will have an impact on the air pressure.
3, check the valve. If the valve stem and the valve core do not match with each other, there are protruding concave phenomenon and other defects, so it is inconvenient to inflate and measure the air pressure.
4, inflate should pay attention to clean. The filled air must not contain moisture and oil to prevent deterioration of the inner tube rubber.
5, when the inflation should not exceed the standard after the excessive deflation, but also can not be too long to inflate outside and inflated too much. If more than the standard is exceeded, the cord will be excessively stretched, causing its strength to decrease, affecting the life of the tire.
6ã€Before inflating, the dust on the valve mouth should be wiped clean, do not loosen the valve core, apply soap soaked water on the valve after inflating, check whether there is leakage (if the leak will produce small bubbles), and the valve The mouth cap is tightly fitted to prevent sediment from entering the interior of the valve.
7. When the radial tire is inflated, due to structural reasons, its sinking volume and grounding area are large, and it is often mistakenly believed to be insufficiently inflated and excessively inflated; or vice versa, since the amount of sinking and grounding area is large, When the air pressure is insufficient, it is mistaken for enough. Apply a standard barometer to determine. The radial pressure of the radial tires should be higher than that of ordinary tires by 0.5-1.5 kg/cm2. Second, the correct understanding of the car's tire pressure
For the daily use of tires, pay attention to tire pressure problems. Some people think that the puncture is too full and that the tire under pressure problem is not very big, which is very one-sided.
1, if the tire pressure is not enough: the general car's travel speed is very fast, the shape of the tire in a high-frequency alternating state, if the pressure is insufficient deformation will increase, tread tread on both sides will be excessive wear, the carcass Due to the inability to withstand the pressure of the ground, it is distorted and generates high temperatures that accelerate the wear of the tire and eventually lead to puncture.
2, if the tire pressure is too high: if the pressure is too high will make the tire too hard to lose the elasticity and shock absorption capacity, not only grip worse, the central tread pattern excessive wear will produce uneven tread depth phenomenon, the tire at high speed It is also possible that a puncture may occur due to the inability to withstand excessive inflation pressure during operation.
Therefore, tire pressure is too high or too low to have a puncture hazard. The standard air pressure of the tire should be maintained in accordance with the requirements of the manufacturer, including the spare tire pressure. The tire pressure measurement can be measured by the tire pressure gauge by itself, but it must be measured at the normal temperature of the tire because the measurement result in the hot tire state is inaccurate.
Third, why car tires filled with nitrogen?
Nitrogen is an inert gas. When the temperature of the dry nitrogen changes, the volume expansion is much lower than that of the air containing moisture. Therefore, when the high-speed tire heats up, the tire pressure rises less, which reduces the chance of a tire burst. In addition, since nitrogen does not contain moisture, it protects the interior of the rim from oxidation, thereby effectively extending the service life of the tire.
Nitrogen, under normal circumstances, is a colorless, odorless, odorless gas, and is generally non-toxic. Nitrogen accounts for 78.12% (volume fraction) of the total atmospheric mass and is the main component of air. At room temperature, it is a gas. When it is cooled to -195.8°C under standard atmospheric pressure, it becomes a liquid with no color. When cooled to -209.86°C, liquid nitrogen becomes a snow-like solid. Nitrogen is not flammable and does not support combustion. Its chemical properties are very stable. It is difficult to react with other substances at room temperature.
1, save fuel.
Comparing experiments on tire filling with nitrogen and air filling were conducted in the United States. Statistical results after the experiment showed that nitrogen-filled tires run 26% more miles than air-filled tires. Nitrogen-filled tires can be inflated according to the design tire pressure, which can reach the fuel consumption index of the car design. Tests have shown that nitrogen filling is 2-10% less than air-filled tires.
2, to maintain standard tire pressure.
The purpose of filling the tire with nitrogen is to make the partial pressure in the tire equal to the outside (differential pressure inside and outside the tire), so that a small amount of oxygen stays inside the tire and does not permeate the tire wall, resulting in insufficient tire pressure. The purpose of filling the tire with nitrogen is not related to the purity of nitrogen, but is to keep the oxygen in the tire within the range of 2% to 5%. This small amount of oxygen can generate partial pressure equal to the outside in the tire. Replacing the relatively small volume of oxygen molecules with larger nitrogen molecules slows the rate at which gas permeates through the tire's sidewall. This means that, theoretically, nitrogen can keep your tires up to standard tire pressure for longer periods of time. In order to avoid abnormal wear of the tire and reduce rolling resistance and reduce fuel consumption.
Fourth, the advantages of nitrogen filling in automobile tires:
1, to improve the stability and comfort of tires
Nitrogen is an almost inert diatomic gas. Its chemical properties are extremely inert. Its gas molecules are larger than oxygen molecules, and it is not easy to heat up and shrink. Its deformation range is small. Its penetration into the tire's sidewall is about 30 to 40% slower than air, and it can keep Stabilize the tire pressure, improve the stability of the tire and ensure the comfort of driving; the acoustic conductivity of nitrogen is low, equivalent to 1/5 of that of ordinary air, and the use of nitrogen can effectively reduce tire noise and improve the quietness of driving. 2, to prevent flat tires and lack of gas grind
Tyre puncture is the number one killer in road traffic accidents. According to statistics, 46% of traffic accidents on highways are caused by tire failures. Among them, punctures account for 70% of total tire accidents. Tire temperature will increase due to friction with the ground. Especially at high speeds and during emergency braking, the gas temperature in the tire will rise rapidly and the tire pressure will suddenly increase. Therefore, there may be a possibility of a flat tire. The high temperature leads to tire rubber aging, fatigue strength, tread wear, and it is an important factor in the possible puncture. Compared with general high-pressure air, high-purity nitrogen has no oxygen, almost no moisture and no oil. Its low coefficient of thermal expansion, low thermal conductivity, and slow temperature rise reduce the rate of heat accumulation in tires. Characteristics, so you can greatly reduce the chance of puncture.
3, extend tire life
After using nitrogen, the volume change of the tire pressure is stable, which greatly reduces the possibility of irregular friction of the tire, such as crown grinding, shoulder grinding and eccentric wear, and improves the service life of the tire. The aging of rubber is influenced by oxygen molecules in the air. As a result of oxidation, its strength and elasticity decrease after aging, and cracking may occur, which is one of the reasons for the shortened service life of tires. The nitrogen separation device can largely exclude oxygen, sulfur, oil, water, and other impurities in the air, effectively reducing the degree of oxidation of the inner liner layer of the tire and the phenomenon of corrosion of the rubber. It does not corrode metal rims and prolongs the tires. The service life also greatly reduces the rustiness of the rim.
4. Reduce fuel consumption and protect environmental protection.
The shortage of tire pressure and the increase of rolling force after heating will cause the fuel consumption of the vehicle to increase. In addition to maintaining a stable tire pressure and delaying the reduction of tire pressure, nitrogen gas is dry and does not contain water and heat. Low, slow heating characteristics, reduced tire temperature increase while walking, and small deformation grip improve, reducing the rolling resistance, so as to achieve the purpose of reducing fuel consumption. 1, the actual effect of nitrogen in private cars is limited
Theoretically speaking, because there is little moisture, oil, and oxygen in nitrogen, there is indeed a certain benefit to tire explosion protection, especially on high-load tires of trucks. For the average private car, the unit load of the tire is small. Even if it is running on the surface of the summer and summer of fifty to sixty degrees, the heat of the tire will not be as big as an airplane's ups and downs, an F1 racing car or a heavy truck. Therefore, the use of nitrogen and the use of ordinary compressed air, in theory, the former may be better than the latter, but the actual difference is not so great.
2. Limited noise reduction of nitrogen-filled tires
The noise caused by tires has nothing to do with nitrogen filling and the use of ordinary compressed air, and the key to noise is the quality of the tires. Relevant experiments show that at three speeds of 80 km/h, 100 km, and 120 km/h, nitrogen filling is only slightly less than 1 dB lower than air-filled tire noise, and this difference is almost negligible.
3, often measured tire pressure is the key
To ensure tire safety during summer driving, maintaining normal tire pressure is the key. This is the real reason for the puncture because high temperatures can cause tire pressure that is already in the normal range to soar rapidly, even exceeding a critical value. The best way to prevent a puncture during the summer is to measure the tire pressure and reduce it appropriately. In addition, we must always pay attention to tire usage, pay attention to maintenance, if it is found that severe wear or tire bulging, especially the deformation of the wheel, we must immediately go to the repair shop inspection, repair or replacement.
Summary: Because nitrogen is an inert gas, the penetration rate in the tire is low, which can keep the tire pressure stable, reduce the chance of bursting tires, prolong the tire life, reduce the tire's vibration on bumpy roads, and make the vehicle run steadily. It also has volume. Low conductivity, which greatly reduces the noise generated when the tire rubs against the ground. Especially in the hot climate period, nitrogen tires can show their strengths on the highway.
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