The problem of the quality of automobile tires has once again caused widespread concern. As a case of recent consumer complaints, tire bulging should be regarded as the most common phenomenon in tire damage. In response, some netizens have raised questions about whether tire bulging is related to rubber quality. Today, we look at what caused the tire bulging in the end? How should we prevent it?

Tires are an important part of the car. The tires that look very simple are actually very complicated. There are many types of tires. At present, common pneumatic tires are biased tires and radial tires. They are named according to the different forms of carcass cords. Here we take the car radial tire as an example to understand its structure:

The basic structure of the tire

1. Tire Tread: A thick rubber layer that provides a contact interface with the ground, as well as drainage and resistance to old properties.

2. Crown belts: Double or triple reinforced belts have vertical flexibility and high lateral rigidity to provide steering force.

3. Side: The sidewalls accommodate and protect the carcass ply, and the function of the carcass ply is to fix the tread of the tire on the rim.

4. Beads: The inner bead ring allows the tires to be securely fastened to the rims and brought together.

5. Inner liner: It ensures the tire has good airtightness and maintains the correct tire pressure.

Pneumatic tires are mainly composed of rubber parts and plies. Not to mention that the tires on the outer surface are rubber, but the rubber in the tire carcass only plays the role of the components of the composite carcass, sealing, wear-resisting, stab resistance and partial buffering. The "power" is the curtain hidden in the rubber. The curtain cloth is used as a skeleton material in the tire and is a main force component of the tire. In other words, the inflation pressure on the tires and the load on the vehicle, the prevention of expansion of the inner tube after inflation, the protection of the inner tube from mechanical damage, the transmission of traction, and the braking force, are almost all covered by the cord. In this regard, the appearance of rubber is not great.

Radial Tire (Left) and Oblique Tire (Right) Cloth

Different from the cross-fitting of the ply cords of bias tires, the radial meridian cords resemble the meridian shape, and due to the strength of the meridian line, the weft only plays the role of connecting the adjacent warp threads. If you rely solely on the strength of the cord's warp, weft, and rubber, the radial tire can be easily disconnected from the warp when it is filled with gas or when it is driven and braked. In order to cure this weak link, the material of the radial tire ply is made of steel wire, and a “belt layer” composed of several layers of cords is added between the crown rubber and the ply. (Ply and belt are all The steel wire is a full steel tire, and the belt is a semi-steel tire for the fiber material curtain, so as to ensure that the tire can withstand various forces.

The final mechanism of tyre bulging - cracking of the sidewall cord

The causes of the bulging phenomenon are various. In general, the occurrence of tire bulging phenomenon is mostly due to accidental strong impact during use, which causes the tire to have a severe squeeze between the impact object and the rim flange. Deformation. For the radial tire, the sidewall is the weakest part. Because there is no protection of the belt, once the severe deformation occurs, the sidewall cord will break, and the air inside the tire will break from the crack. Lift up and form a bulge. The combination of inaccurate air pressure, poor road conditions, accidental impact, and inadvertent driving is a major factor in the phenomenon of tire bulging. In addition, tire obstructions often appear on road curbs and when parking, which may cause damage to the tire's wall and “drum kit”.

If the drums are bulged in large quantities, they are largely due to quality problems. Due to insufficient quality of the cords during the tire manufacturing process, the rubber is hung, or due to the high water content of the colloids. According to the relevant regulations of the industry, the normal trial period of ordinary tires is 3-5 years from the date of delivery. If during this period, bulge is not caused by special reasons such as collision, the quality of the tire may be problematic.

Does tyre bulging affect traffic?

So, will the tire pack affect the traffic? Is there any danger? Here, we must remind you that the appearance of “bulging” on the side of the tire not only affects the traffic, but also has the danger of puncture. It is a hidden danger of major vehicle accidents. Therefore, if there is a "bulging" situation, the "bulging" tires can no longer be used. Be sure to go to a regular tire shop for professional testing and replacement.

How to prevent tire bulging and periodic inspection of tires

Too much or too little air pressure will have a negative effect on the tire. The air pressure is too high, the tire becomes hard, the contact area between the tread and the ground is reduced, and the controllability and riding comfort are affected. The tire is easy to wear; the air pressure is too low, the tire becomes soft, the vehicle fuel consumption rises, and the tire is easily obstructed when hit. There is a large shear stress between the rim and the rim. How to avoid the bulging phenomenon and extend the life of the tire? Here are some tips to tell you:

First: When installing the tires, go to a professional tire shop and use professional tire installation equipment and professional installation procedures.

Second: Try to avoid driving on harsh road conditions for a long time. If it can not be avoided, please note that the slower the speed, the better.

Third: Develop a good tire maintenance habit, constantly check the tire pressure, and ensure that the tire is driven with normal tire pressure.