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The car tire is broken.

The only part of the car that touches the ground is the tire, and the handling, braking performance and bearing capacity of the car will ultimately be realized through the tire. Usually, tire maintenance is particularly important. Therefore, no matter how good the performance of the car is, the tires are hard to break. Let's talk about several reasons for tire damage first.

The car itself

1. Tire pressure is too high

When the tire is used under high air pressure, the contact area between the tire and the road surface becomes smaller and the pressure increases, which accelerates the wear in the middle of the tread. When the tire pressure is too high, the stress on the carcass increases, which reduces the tensile strength and elasticity of the cord layer, and it is easy to be stabbed by sharp objects, and the carcass may burst when it is subjected to a large impact. In addition, high tire pressure will also reduce tire grip and extend braking distance; Affect the comfort and aggravate the wear of chassis parts.

2. Low tire pressure

Low tire pressure is more harmful to tires. This is mainly due to the increase of sidewall deformation, which leads to excessive alternating stress of carcass cord layer. Periodic compression deformation will accelerate the fatigue damage of cord. At first, the rubber cord fell off, and then it broke quickly, resulting in premature tire scrapping. When the tire rolls under low air pressure, it will aggravate the heating temperature of the tire. When the tire temperature is too high, it will also cause the carcass part of A to delaminate, resulting in friction between the cords, and the temperature of the delaminated part is higher, which is more likely to cause sidewall explosion. When the tire is pressed down, the load in the middle of the tread decreases and the edge load increases, which leads to serious tread wear. Tire depression will not only aggravate tire wear, but also increase rolling resistance and fuel consumption.

3. Tire overload

The tire damage characteristics under overload are similar to those under low air pressure, but the tire wear and damage caused by overload are more serious. Due to large tire deformation and excessive sidewall stress, the fatigue and strength of tire materials decrease rapidly, and the cord layer is most likely to break or burst at the sidewall. Overloaded tires often burst when rolling on stones. Practice has proved that when the tire is overloaded by 20%, the tire life is reduced by 30% and the rolling resistance is increased by 40%. Overloading will inevitably lead to premature tire damage or scrapping.

4. Chassis failure

During driving, the poor technical condition of some mechanisms of automobile chassis is also an important reason for abnormal wear or damage of tires. Among them, the biggest damage to the tire is the inaccurate positioning of the front wheel, especially if the toe-in is too large or too small, which will cause the front wheel to roll and slip, causing serious tread wear on one side and burr on the other side. Even if it deviates from the standard, it will lead to eccentric tread wear. The front wheel alignment error will not only damage the tire, but also directly affect the steering performance. In addition, the frame or suspension is deformed, the rear axle is displaced, the steering rod ball head or knuckle is loose, the wheel bearing clearance is too large, and the braking is delayed or locked. , will cause abnormal tire wear. Therefore, regular maintenance of vehicle and front wheel alignment, especially steering and braking system, will play an important role in reducing tire wear and prolonging service life.

external factor

1. Sunshine

In the environment of tire exposure, not only the tire pressure will increase, but also the rubber will be exposed to sunlight and ultraviolet rays for a long time, which will lead to the aging of the tire rubber surface and the probability of tire puncture will also increase. Try to find a cool parking space for outdoor parking, and give priority to underground parking if possible. It is worth noting that don't park your car in uneven places such as kerbs just to find a cool place to park. At the lowest point, the tire will be subjected to excessive pressure, which will lead to the deformation of the steel wire inside the tire and lead to tire damage.

2. Lifting cover

Dumpers can be seen everywhere on the road, most of which are level with the ground, but there are also some bumps or depressions. No matter how good the technology is, there are always a few that can't be hidden. If the manhole cover and the road surface are on the same level, we will pass slowly when we pass, which has little effect on the tires. But be careful if the manhole cover is uneven. Although the periphery of the manhole cover has been polished, if the speed is too fast, the side tire of the passing tire will be easily scratched by the manhole cover, which will seriously puncture the tire. This kind of accident is very common, so we still remind the owner to be careful with the manhole cover and cherish his life.

3. (Czech) Stalne; Stalne (Sweden); (British) Si Tong

If there is a stone stuck on the tire tread, the most direct impact is that you will obviously hear some harsh sounds when driving, which is louder than the noise of the tire. The stone stuck on the tire tread not only affects the beauty and noise, but also affects the functions of grasping the ground and draining water, thus affecting the driving safety.

What's more, there may not be all stones stuck on the tire tread, and there are other foreign bodies. When the car body vibrates while driving, the sharp edges and corners of stones or other foreign objects will damage the tires. If the driving speed is very fast, these foreign objects are likely to cut the rubber on the outermost layer of the tire, eventually cutting the inner tube, causing air leakage, and in severe cases, a puncture may occur.

4. Pavement pit

Unlike the speed bump on the road, the speed bump is convex, so it is easy to see, while the pit on the road is basically invisible. By the time you see it, it will be too late to brake. If you drive too fast carelessly, you will experience the feeling of roller coaster, and it will also cause some damage to tires and suspension. Therefore, it is necessary to slow down on unfamiliar roads. Besides observing the road conditions, we should also observe the road conditions.

5. kerbstone in the street

Kerbs are also called kerbs and shoulders. Drive to the destination, there is no place to park. In desperation, we can only make do by the roadside. Roadside parking, one is roadside parking, and the other is robbing roadside parking. If the technology of lateral parking is not in place, the side of the tire will often rub against the kerb, and the side is the weakest part of the tire, so the side is easy to wear and tear, forming a bulge and there is a hidden danger of puncture.

Rushing to the side of the road to park is often a helpless move. The data from the National Rubber Tire Quality Supervision and Inspection Center show that if the height of the kerb is 15cm, the included angle between the side of the vehicle tire and the kerb is less than 45 degrees, and the speed exceeds 30km/h, at least 3 to 4 cords of the tire will break.

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