For many drivers, the tire pressure problem of the car is not clear at all, and many of them are hearsay, such as: reducing the tire pressure can prevent slip, which is completely nothing. Let’s introduce it to you.
1. What is the effect of tire pressure on brakes?
All the weight of the car is borne by the tires, and tire pressure is an important factor affecting the tires. Tyre pressure that is too high or too low can pose a safety hazard.
When the tire pressure is too high, first of all, the deformation of the tire will be very small, the tire will become very “hard”, and the rolling resistance is reduced. Secondly, when the tire pressure is high, the tire will undergo slight deformation that cannot be seen by the naked eye, and the contact area between the tire and the ground will decrease, so the sliding friction will be reduced, and the power loss will be reduced, which is also a reason for the fast acceleration.
However, high tire pressure will also bring some negative effects, that is, the pressure per unit area of the tire increases, and the tire wall will become thinner due to excessive air pressure, so if you encounter bulges or potholes during driving, it is easy to blow out the tire.
Acceleration under standard tire pressure is slightly slower than in the case of high tire pressure, that is, the tire and the ground are in full contact with the standard tire pressure, so the friction is larger than when the tire pressure is high, and the rolling resistance of the tire is slightly larger, and the acceleration is slower, but the tire wear under standard tire pressure is more even, and the tire wall can withstand more impact, so the probability of puncture is much smaller.
Second, is low tire pressure more conducive to braking?
Low tire pressure is a more common situation encountered by car owners, because of the usual neglect of inspection, so many car tires may be in a low tire pressure state, which is what we usually call “gas loss”.
When the tire pressure is low, the tire will be significantly deformed, and this deformation makes the rotation of the tire uneven, especially the tire will generate a lot of heat inside, accelerating the aging of the tire and the probability of puncture.
The braking effect of the car depends on the sliding friction between the tire and the ground, and it seems that the area of the tire ground is larger when braking hard under low tire pressure, but in fact, due to the relationship between the tire shoulder, the contact between the tread and the ground is not close, so this is also a factor that causes the braking effect to deteriorate.
In addition, the center of gravity will shift forward when the car brakes at full force, and the tire is easy to deform when the tire pressure is low, the support becomes worse, the front tire is flattened when braking harder, the shift of the center of gravity is more obvious, the front of the car is also pressed lower, the corresponding rear tail is also cocked higher, and the friction of the rear wheels will be reduced, so it will affect the braking effect.
Third, low tire pressure anti-slip is unreliable
How can braking distances in snow conditions be minimized without changing tires and installing snow chains? Will lowering the tire pressure help reduce the braking distance?
Many people will think that low tire pressure will shorten the distance of snow braking. The reason is simple, they feel that low tire pressure will deform the tire, thereby increasing the contact between the tire and the ground, to achieve the effect of shortening the braking distance.
The factor that determines the braking distance is actually the pressure. As we all know, the same pressure is different on the contact surface of different sizes, that is, the smaller the contact surface, the greater the pressure generated, which is especially true for tires. When braking under any tire pressure, the braking force of the vehicle will not change, and when the air pressure of the tire is increased, the rubber is squeezed and expands outward, causing the grain on the tire surface to be jacked.
After reducing the tire pressure, the tire will be deformed due to insufficient air pressure, which is what we often call gas loss, at this time the tire can not be in close contact with the ground, and the tire begins to soften, so that the ground area of the tire increases, under the same braking force, increasing the area will reduce the pressure, so it will affect the braking effect.
For some of the above questions, I hope you can take a detailed look. At the same time, everyone should take a look at the various points of attention to tire pressure. Especially when summer is coming, you can appropriately reduce the tire pressure to avoid the situation of flat tires.
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