1. What should I pay attention to when inflating car tires?
1. Pay attention to safety when inflating. Always use a barometer to check the air pressure to prevent over-inflation, which may cause the tire to burst. 2. After stopping, you must wait for the tires to dissipate heat before inflating, because the tire temperature will rise when the vehicle is running, which will affect the air pressure.
3. Check the valve. If the valve nozzle and the valve core are not matched smoothly, there are convex and concave phenomena and other defects, it is inconvenient to inflate and measure the air pressure.
4. Pay attention to cleaning when inflating.The filled air should not contain moisture and oil to prevent deterioration and damage of the inner tube rubber.
5. Inflate should not exceed the standard and then deflate, nor should it be overinflated due to long-term inability to inflate outside. If it exceeds the standard too much, it will cause the cord to stretch too much, causing its strength to decrease, and affecting the life of the tire.
6. Clean the dust on the valve nozzle before inflating. Do not loosen the valve core. After the inflation is completed, apply soapy water to the valve nozzle to check for leaks (small bubbles will be generated if the air leaks), and the valve The nozzle caps are all fitted tightly to prevent the sand from entering the inside of the valve.
7. When the radial tire is inflated, due to structural reasons, its sinking amount and grounding area are large, and it is often mistaken for insufficient inflation and excessively inflated; or vice versa, because its sinking amount and grounding area are inherently large. Even when the air pressure is insufficient, it is mistaken for sufficient. Use standard barometer to measure. The air pressure of radial tires should be 0.5～1.5kg/cm² higher than that of ordinary tires. 2. Correctly understand the tire pressure of a car
For the daily use of tires, attention should be paid to tire pressure. Some people think that a puncture is caused by too much air, and that the problem of underpressure is not big, which is very one-sided.
1. If the tire air pressure is insufficient: the general car travel speed is very fast, the shape of the tire is in a high-frequency alternating state, if the air pressure is insufficient, the deformation will increase, the tire pattern on both sides of the tread will be excessively worn, and the carcass It is distorted and deformed due to the inability to withstand the pressure on the ground, resulting in high temperature and accelerating the wear of the tire, which will eventually lead to a puncture.
2. If the tire pressure is too high: If the pressure is too high, the tire will be too hard and lose its due elasticity and shock absorption ability. Not only will the grip become worse, the excessive wear of the central tread will cause uneven depth of the tread. The tire is at high speed. During operation, a tire may blow out due to the inability to withstand excessive expansion pressure.
Therefore, if the tire pressure is too high or too low, there is a danger of a puncture. The pressure problem should not be underestimated. The standard tire pressure, including the spare tire pressure, should be maintained in accordance with the manufacturer’s requirements. The tire pressure can be measured with a tire pressure gauge by itself, but it must be measured at the normal temperature of the tire, because the result of the measurement in the hot tire state is not accurate.
3. Why should car tires be filled with nitrogen?
Nitrogen is an inert gas. When the temperature changes, the volume expansion of dry nitrogen is much lower than that of air containing moisture. Therefore, when the high-speed tire heats up, the tire pressure rises less, reducing the chance of puncture. In addition, because nitrogen does not contain moisture, it can protect the inside of the rim from oxidation, thereby effectively extending the service life of the tire.
Nitrogen is a colorless, odorless and odorless gas under normal conditions, and is usually non-toxic. Nitrogen accounts for 78.12% (volume fraction) of the total atmosphere and is the main component of air. It is a gas at normal temperature. When cooled to -195.8°C under standard atmospheric pressure, it becomes a colorless liquid. When cooled to -209.86°C, liquid nitrogen becomes a snow-like solid. Nitrogen is not easy to combust and does not support combustion, and its chemical properties are very stable. It is difficult to react with other substances at room temperature.
1. Save fuel.
In the United States, a comparative test of nitrogen filling and air filling of tires has been done. The statistical results after the experiment show that nitrogen filled tires run 26% more mileage than air filled tires. Nitrogen-filled tires can be inflated according to the designed tire pressure, which can reach the fuel consumption index when the car is designed. Tests have proved that nitrogen-filled tires save 2-10% of fuel compared to air-filled tires.
2. Maintain standard tire pressure.
The purpose of tire nitrogen filling is to make the partial pressure inside the tire equal to the outside (balance between the internal and external partial pressure of the tire), so that a small amount of oxygen stays inside the tire and will not penetrate the sidewall and cause insufficient tire pressure. The purpose of tire nitrogen filling has nothing to do with the purity of nitrogen, but to make the remaining amount of oxygen in the tire reach 2 to 5%, so that a small amount of oxygen in the tire can generate a partial pressure equal to the outside. Replacing relatively small oxygen molecules with larger nitrogen molecules slows down the rate of gas penetration into the tire wall. This means that, theoretically, nitrogen filling can keep your tires at the standard tire pressure for a longer period of time. , So as to avoid abnormal tire wear and reduce rolling resistance to reduce fuel consumption.
Fourth, the benefits of nitrogen gas filling of car tires:
1. Improve the stability and comfort of tire driving
Nitrogen is almost an inert diatomic gas with extremely inactive chemical properties. The gas molecules are larger than oxygen molecules, are not easy to expand and contract with heat, and have a small deformation range. The rate of penetrating the tire wall is about 30-40% slower than that of air, and it can maintain Stabilize tire pressure, improve tire driving stability, and ensure driving comfort; the audio conductivity of nitrogen is low, equivalent to 1/5 of ordinary air. Using nitrogen can effectively reduce tire noise and improve driving quietness. 2. Prevent puncture and run-off
Blowouts are 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 the total number of tire accidents. , The tire temperature will increase due to friction with the ground, especially during high-speed driving and emergency braking, the air temperature in the tire will rise rapidly, and the tire pressure will increase sharply, so there is a possibility of a tire blowout. The high temperature causes the tire rubber to age, the fatigue strength decreases, and the tread wears severely, which are also important factors that may cause a tire blowout. Compared with general high-pressure air, high-purity nitrogen has no oxygen, almost no moisture, and no oil. It has a low coefficient of thermal expansion, low thermal conductivity, slow heating, and reduces the speed of tire heat accumulation. Features, so it can greatly reduce the chance of a puncture.
3, prolong the service life of tires
After using nitrogen, the tire pressure is stable and the volume change is small, which greatly reduces the possibility of irregular tire friction, such as crown wear, shoulder wear, and partial wear, which improves the service life of the tire; the aging of rubber is affected by oxygen molecules in the air. Due to oxidation, its strength and elasticity decrease after aging, and there will be cracks, which is one of the reasons for the shortening of the service life of the tire. The nitrogen separation device can greatly remove oxygen, sulfur, oil, water and other impurities in the air, effectively reducing the degree of oxidation of the tire inner liner and the phenomenon of rubber being corroded, and will not corrode the metal rim, and lengthen the tire The service life also greatly reduces the rust of the rim.
4. Reduce fuel consumption and protect environmental protection.
Insufficient tire pressure and increased rolling force after heating will increase the fuel consumption of the car when driving; while nitrogen can maintain a stable tire pressure and delay the decrease in tire pressure, it is dry, oil-free and water-free, and has thermal conductivity. The characteristics of low temperature and slow temperature rise reduce the increase in temperature when the tire is walking, and the increase in grip with small deformation, which reduces the rolling resistance, thereby achieving the purpose of reducing fuel consumption. 1. The actual effect of nitrogen charging in private cars is limited
In theory, because nitrogen contains little water, oil and oxygen, it does have certain benefits for tire explosion-proof, especially on high-load tires of trucks, the effect will be more obvious. For ordinary private cars, the tire unit load is small. Even if the tires are driven on the surface in summer of fifty or sixty degrees for a long time, the tire heat will not be as large as airplane take-off and landing, F1 racing cars or trucks. Therefore, in theory, the former may be better than the latter, but the actual difference is not that big.
2. Nitrogen-filled tires have limited noise reduction
The noise caused by tires has nothing to do with nitrogen filling and the use of ordinary compressed air, and the key to the noise lies in the quality of the tires. Related experiments show that at three speeds of 80 kilometers, 100 kilometers, and 120 kilometers per hour, the noise of nitrogen-filled tires is only slightly lower than that of air-filled tires by less than 1 decibel, and this difference is almost negligible.
3, regular tire pressure measurement is the key
To ensure the safety of tires during summer driving, maintaining normal tire pressure is the key. Because the high temperature will cause the tire pressure within the normal range to rise rapidly, or even exceed the critical value, this is the real cause of the tire puncture. To prevent a puncture in the summer, the best way is to measure the tire pressure frequently and lower it appropriately. In addition, always pay attention to the condition of the tires and pay attention to maintenance. Once you find that the tires are badly worn or the tires are bulging, especially the rims are deformed, you must immediately go to the repair shop to check, repair or replace.
Summary: Because nitrogen is an inert gas, the permeability in the tire is low, it can keep the tire pressure stable, reduce the probability of puncture, prolong the life of the tire, and reduce the vibration of the tire on the bumpy road, so that the vehicle can run smoothly. It also has sound volume. The function of low conductivity greatly reduces the noise generated when the tire rubs against the ground and so on. Especially during periods of hot weather, nitrogen tires can show their advantages on highways.
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