Q&A on fear of puncture (17) What is the right tire pressure? 202 1-02-26

Q&A on fear of puncture (17) What is the right tire pressure?

Liu Xiaoliu Chapter 3965438 +0

Xin Chou year

Revenge and hatred cycle again, and things move for a year.

Bai Shou has never heard of Taoism, and he is extremely poor.

Time flies, and the footsteps of the years have passed through the garden in spring and the fields in summer. Looking up, the autumn rain has quietly arrived, tapping the fallen leaves and stimulating the fragrance of the earth. . .

Come on! Stop feeling, talk about tires!

? Yeah! This time, let's talk about the tire pressure of cars. Does tire pressure affect tire life? In fact, in general, comrades still have a high awareness of tire safety, especially the tire pressure of automobiles, for fear that the tire pressure will have three highs and two lows, which will directly affect tire life and driving safety.

@ 亵亵亵亵亵: Will the next tire pressure value affect the tire life?

Look, a friend mentioned this problem. No, let's look at the effect of air pressure on tire life first. We talked about a tire with a skeleton and a pressure limit. Only when the tire runs within the design pressure range can the tire run farther and have a longer life, and it is possible to successfully complete the life of the tire. Otherwise, too high or too low pressure will cause great wear and damage to the tire, leading to the premature end of the "life" of the tire.

As we all know, tires are usually filled with air, which is the natural air we breathe. Belonging to fluid, it naturally follows the laws of fluid mechanics (Pascal's law). One of the characteristics of fluid is that in a closed tire, the pressure is the same everywhere, and it always expands circularly. Just like the balloon we blow, it is round no matter how we blow it. This is the property of fluid.

And tires can't escape the curse of being blown round. In order to increase the friction of the tire, the tire skeleton designed by the designer is flat under a certain air pressure, which can maintain the maximum contact area with the ground to obtain the maximum friction. If the air pressure is lower than the lower line of the design air pressure, the tire crown cannot be flattened by the air in the tire, and the tire crown will bend and deform inward due to the puncture. If the air pressure is higher than the upper limit of the design air pressure, the air in the tire will support the tire to be too round, and as a result, the crown will bend outward, as shown in the figure.

As can be seen from the figure, too high or too low tire pressure will reduce the friction between the tire and the ground, resulting in less contact with the ground. At the same time, it will also cause premature wear of some parts of the tire, leading to premature scrapping of the tire, so too high or too low tire pressure will affect the life of the tire.

So what is the right tire pressure? Let's take a look at the tire pressure sign on the car, as shown in the figure.

This chart is the tire pressure sign on the door. Although it is in every car, it is estimated that there are not many friends who can understand it. I have studied this sign for a long time, such as tire inflation pressure (cold). What does this "cold" mean? Does it mean that the car is "hot" when running on the road, or does it mean that the gas that can only be added when the car cools down is called "cold"? If the driver is in a hurry and must inflate in a "hot state", how much should he charge? It's not on the sign.

Let's take a closer look at the "intra-fetal pressure kPa" in the red box. The unit is KPA, 1bar= 100kpa. So what is the pressure on the front and rear tires? After reading it for a long time, I finally understood that the tire pressure before and after this car is not only different, but also divided into no-load and full load. I understand the meaning of no load, that is, I drive alone, and a car that doesn't solicit customers is called no load. The sign stipulates that the no-load front wheel pressure is 2 10kpa and the rear wheel pressure is 200kpa. I also understand the meaning of full load, that is, I drive and the car is full of passengers. The sign stipulates that the front wheel pressure is 230kpa and the rear wheel pressure is 230kpa.

Ha ha ha, everyone understand? Don't understand, more confused?

For example, suppose I am a "brother" who gets up in the morning and walks to the front of the car (the tire is already cold). Without saying anything, I took out the air pump, then charged the front tire with 265,438+00 kPa air pressure, and then charged the rear wheel with 200kpa no-load air pressure, and then happily started a new day's work, humming a tune. Fortunately, I didn't go far when I saw a guest waving for a car. As soon as the car stopped, I saw four big men coming. As soon as I saw that the car was broken and full, I quickly took out the air pump to pump up the car. At this time, regardless of the "cold state" or "hot state", the air pressure of the front and rear tires quickly rose to 230kpa, and my heart was at ease, so I sang the four people all the way to their destination. Although the passengers left, I was busy driving away again. I quickly sniffed and deflated four tires, because my car was empty again. Boy, I didn't do anything this day, just pump up and deflate. Don't tell me, I'm still secretly glad I'm beautiful. I'm still good. Fortunately, I have an air pump in my car. Look at those drivers who don't have air pumps. They spend all day looking for a place to cheer up around the world. How anxious they are when they can't find it.

Comrades laughed, you are sick! Have you ever seen that "brother" smoke all day to vent? I scratched my head. what can I say? It seems that they were enlightened before me. My busy work all day is caused by "signs" and I hate it.

A friend asked, what is the appropriate air pressure of this tire?

Well, after decades of experience, it is generally known that the tire pressure of a car is qualified as long as it is above 200 and below 300kpa. If you want to be comfortable and gentle, the air pressure should be controlled at 200kpa. If you want to save oil, it's right to charge the air pressure to 300kpa. If people want a long summer without winter, they must press an air pressure, then 250kpa is good, which is also known to all now.

A serious friend said, "there is no air pressure in winter and summer." Can you give a reasonable explanation, old man? " ?

Well, please look at the maximum atmospheric pressure allowed for your tires. Is it divided into winter and summer? More reasonably, you only need to pump the tire pressure to 80% of the maximum tire pressure. I didn't listen to the old man:

A full meal is good for your health.

Inflation is 80% pressure, and tires are the best.

202 1 Friday, February 26th? Haidian laotou

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