What are the hazards of too high or too low tire pressure?

Wear and Leak Tire and Noise: Too high or too low tire pressure will accelerate tire wear. When the tire is combined with the hub, it is like a "flexible high-pressure gas tank". The tires of passenger cars are empty tires, that is, inner tube tires; Therefore, the close cooperation between the two parts plays a role in preventing air leakage. As a metal casting, the hub is not easy to be compressed and deformed, so only the tire will be "deformed" by high air pressure.

1. Tire pressure adjustment is reasonable. At this point, the position where the crown needs to touch the ground will reach the "just right" standard. Reasonable contact surface will not only improve wheel grip, but also reduce the vibration intensity between tire and ground foundation, and tire noise will reach the most reasonable level. Reasonable tire pressure standards can refer to vehicle signs. Some vehicles will stick stickers on the inside of the fuel tank cover, and some vehicles will stick stickers under the B-pillars on both sides of the main driver's or co-driver's doors.

The tire pressure is too high. At this point, the rubber layer in the crown will be pushed up like a balloon, and the middle position will be relatively raised. The result can be imagined. First of all, the wear in the middle of the crown will be accelerated, and the service life of the tire will be greatly reduced. Secondly, the contact surface between the tire and the ground becomes smaller, and it is easy to slip when the vehicle accelerates rapidly. When braking, the braking distance will definitely be extended, because braking also depends on the friction between the tire and the ground, but these are not the most important.

When the car is driving at high speed, it will produce high temperature because of friction with the ground. When driving continuously for 200~300 kilometers, the tire pressure will rise synchronously with the increase of tire temperature, and the high temperature will expand the air. The 300 kilometers tested in winter rises to 0.5, and it can reach 0.6~0.8 when the road is hot in summer. What concept? Assuming the standard tire pressure is 2.5 and inflated to 3.0, it is easy to reach the "warning line" after continuous driving. High temperature and abnormal wear will make the tire burst with a high probability.

3. If the tire pressure is adjusted too low, the probability of high-speed tire puncture will be higher due to the "standing wave effect". Low tire pressure means that the overall strength of the pneumatic tire is reduced, but the curb weight (empty weight) of the vehicle remains unchanged, and the vertical pressure exerted on the tire will not be reduced. Under the same pressure, the strength of the tire itself decreases, leading to more serious compression deformation. The wheel speed of the vehicle will be very high, and the contact position between the tire and the ground will always be deformed. What will happen?

Referring to the state shown in the above figure, when the vehicle is driving at high speed, point A will be compressed and deformed when it touches the ground, but it has not fully recovered to its original shape after rotating to point B at high speed, and then it will face rolling deformation. The continuous appearance of this state will accelerate the wear of rubber layer at the same position due to repeated rolling. During the wearing process, the temperature will rise rapidly. The key point is that the so-called point A here is not limited to a certain point. When the tire is running, irreversible deformation will occur in many positions. In this way, abnormal wear, rapid temperature rise and impact will destroy the rubber structure, and the tire will always burst.

To sum up, the tire pressure adjustment of automobile tires should be reasonable, neither too high nor too low. In winter, you can make up according to the standard tire pressure. In summer, the road temperature is very high, and even if you stop, the tire pressure will increase. Therefore, the tire pressure in summer can be appropriately reduced by 0.2~0.3. If it is mainly used for short-distance driving on urban roads, there is no need to adjust it deliberately, because short-distance driving will not exaggerate the tire temperature for reference.