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Huajun tire

Huajun tire

Create value for customers and build brands for the industry.

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06

2021

-

09

The meaning of the numbers in the car inner tube specifications

Author:


Tires

In a variety of vehicles or mechanical assembly of the rolling annular elastic rubber products. It is usually installed on a metal rim, which can support the body, buffer external impacts, achieve contact with the road surface and ensure the driving performance of the vehicle.

Tires are often used under complex and harsh conditions. They are subjected to various deformations, loads, forces, and high and low temperatures during driving. Therefore, they must have high load-bearing performance, traction performance, and cushioning performance. At the same time, it is also required to have high wear resistance and flexibility, as well as low rolling resistance and heat generation.

Half of the world's rubber consumption is used in tire production. Tires are usually made of outer tires, inner tubes, and cushion belts3Part of the composition. There are also those that do not need an inner tube, and the inner layer of the carcass has a rubber layer with good air tightness and needs to be equipped with a special rim.

The structure of tires all over the world is tubeless, radial structure, flat(The ratio of tire section height to width is small)and lightweight direction.

 

The outer tire consists of tread, sidewall, buffer layer(or belt layer)Composition of ply and bead.

The tread is used to withstand various forces.

The sidewall is the rubber layer on the outer layer of the tire side ply to protect the carcass. The ply is a fabric layer composed of side-by-side rubber cords in the carcass. It is the stress skeleton layer of the tire to ensure that the tire has the necessary strength and dimensional stability.

buffer layer(or belt layer)It is a rubber layer or rubber layer between the bias tire tread and the carcass, used to buffer the external impact, protect the carcass, and improve the adhesion between the tread and the ply.

The bead is the part of the tire mounted on the rim. It is composed of a bead core and a bead chafer, which plays a role in fixing the tire.

 

Tire specifications outside tire outer diameterDBead inner diameter or rim diameterdSection widthBand flatness ratio(Tire section highH/Tire section widthB)The unit is generally inch.(in)(1in=2.54cm).

SteamWheelsThe tire is a composite product of rubber and fiber materials and metal materials, and the manufacturing process is a comprehensive process of mechanical processing and chemical reaction. Rubber and compounding agent are mixed and pressed out to make tread;The cord fabric is calendered, cut and laminated to make cord tube or cord fabric roll;The steel wire is formed into a bead after being combined and encapsulated.;Then all the semi-finished products are combined into a blank on the molding machine, and in the metal model of the vulcanizer, the finished tire is made by vulcanization.

 

Supplement:Automobile tire knowledge The journey of a thousand miles begins with a single step. As the four feet of a car, the importance of car tires is self-evident. In the process of high-speed driving of a car, tire failure is the most worrying and difficult to prevent for all drivers, and it is also an important cause of sudden traffic accidents. Tires are an important part of the car driving system, just like the shoes we wear, in addition to the correct selection according to the use function(Don't wear formal shoes to play tennis and sneakers to dance the national standard.)You also need to know how to care. Let's explore the mystery of the tire.

 

The common classification of tires is divided into bias tires and radial tires according to their structure.

The fundamental difference between a radial tire and a bias tire is the carcass. The carcass of a bias tire is a ply that crosses diagonally.;The carcass of radial tire is made of polymer multi-layer cross material, and the top layer is several layers of steel belt cord woven from steel wire, which can reduce the chance of tire being punctured by foreign objects. In terms of design, bias tires have many limitations. For example, due to the strong friction of the crossed cords, the carcass is prone to heat, which accelerates the wear of the tread, and its cord layout cannot provide excellent performance. Handling and comfort;The steel wire belt in radial tires has better flexibility to adapt to the irregular impact of the road surface, and is durable. Its cord structure also means that there is much less friction than the bias line in the car, thus obtaining A longer tread life and better fuel economy. At the same time, the characteristics of the radial tire itself make it possible to have a tubeless tire. Tubeless tires have a recognized advantage, that is, when the tire is punctured, it does not burst like a bias tire with an inner tube(This is very dangerous), But to enable the tires to maintain air pressure for a period of time, which improves the driving safety of the car. In addition, radial tires have better grip than bias tires.

The tires we are talking about below only refer to the radial tires commonly used in cars, commonly known as tubeless tires or atomic tires.

One.How to identify tire markings

Tires are important parts of cars. The marks on car tires are10The correct identification of these marks is very important for the selection, use and maintenance of tires, and is of great significance for ensuring driving safety and prolonging the service life of tires.

Tire specifications:Specifications are the marking data of geometric parameters and physical properties of tires. Tire specifications are commonly expressed by a set of numbers. The former number represents the width of the tire section, and the latter number represents the diameter of the rim, all in inches. The middle letter or symbol has a special meaning:“x”Indicates high-pressure tire;“R”,“Z”Indicates a radial tire;“OneIndicates a low pressure tire.

Level:The level refers to the nominal number of ply layers in the tire rubber layer, which is not completely consistent with the actual ply layers, and is an important indicator of tire strength. The level shall be marked in Chinese, such12Level;Signs in English, such 〃14P.Rthat14Layer pole.

Cord material:Some tires are marked separately, suchNylon”(NYLON), generally marked after the level;Some tire manufacturers in the world are marked with the first letter of Chinese Pinyin after the specification, such9.00-20N,7.50-20GWait,Nindicates nylon,Gindicates steel wire,Mindicates cotton thread,RIndicates rayon.

Load and air pressure:Generally indicate the maximum load and the corresponding air pressure, the load.kgThe unit is, the air pressure is the tire pressure, the unit iskPa.

Rim Specifications:Indicates the rim size to match the tire. facilitate practical use, suchStandard rim5.00F”.

Balance sign:The shape of the mark is made of colored rubber and printed on the sidewall, indicating that the tire is the lightest here and should be facing the valve when assembled to ensure the balance of the entire tire.

Scroll direction:The pattern on the tire is particularly critical to the drainage and anti-skid during driving. Therefore, off-road vehicle tires with asymmetric patterns often use arrows to mark the assembly and rolling direction to ensure the design's adhesion, anti-skid and other properties. If it's wrong, it's counterproductive.

Wear limit sign:Use rubber strips and blocks on one side of the tire to mark the wear limit of the tire. Once the tire wear reaches this marked position, it should be replaced in time, otherwise the tire will burst midway due to insufficient strength.

Production batch number:It is marked with a set of numbers and letters to indicate the manufacturing year and quantity of the tire. Such“98N08B5820”Representation1998Year8MonthBGroup Production No.5820Tires only. The production batch number is used to identify the old and new degree of tires and storage time.

Trademark:The trademark is the symbol of the tire manufacturer, including the trademark text and pattern, generally more prominent and eye-catching, easy to identify. Most of them are linked to the name of the production enterprise.

Other Markings:Such as product grade, production license number and other ancillary signs. Can be used as reference material and information when selected. Tire markings are generally marked in a relatively standardized manner, and you can purchase and use them with confidence after they are clearly identified.

 

The following is a common tire size representation:

Example:185/70R1486H 185:Tread width(mm) 70:Flat ratio(Tire height÷tire width) R:meridian structure14:Diameter of steel ring(Inch) 86:load index(indicates that the corresponding maximum load is530kg) H:Speed code(Indicates that the maximum safe speed is210Kilometer/Hours)

II.How to buy tires

Understanding the basic knowledge of tires is only the first step. The next step is to consider how to buy tires suitable for your car. When choosing, in addition to understanding the tire specifications that your car needs, you should also pay attention to the following aspects.

First of all, give priority to the original tires. The original tires are the ones that can best match the speed of the car and the maximum load of the car. Therefore, in theory, priority should be given when replacing tires.

Secondly, pay attention to the tire pattern, the pattern on the car tire, in addition to the aesthetic effect, also has a great impact on the performance of the tire. Cars that often drive in Shenzhen should choose those tread tires with better drainage, such as regular small block patterns.;The need for cross-country and long-distance running cars, you can choose a large block pattern. Finally, if you are not satisfied with the original handling of the vehicle, you can consider replacing tires with a lower aspect ratio. For many models, one of the most effective ways to improve the appearance and handling performance of the vehicle is to replace tires with a lower aspect ratio. Each type of tire has its specific function, so when choosing a tire, you should ask what type of tire is suitable for what driving habits, so that the car is safer when driving, and the money spent on the tire is more worthwhile. When buying tires, don't just look at the price, you should consult professionals, they will help you accurately match the appropriate tires. When choosing tires, be careful not to mix different types of tires. For example, put tires that are more suitable for off-road vehicles together with tires of ordinary cars, or use directional sports car tires and ordinary tires. Tire wheels are mixed.

Of course, we should try our best to avoid refurbished tires in the purchase. At present, Shenzhen, especially some street shops, often sell some refurbished tires as shoddy ones. Consumers must pay attention to the purchase. The method of identifying retreading tires is very simple:The most common thing is to observe the color and luster of the tire. The color and luster of the tire after retreading are relatively dim, so don't buy such tires blindly. Professional masters identify tires through the signs on the tires. There are some protruding signs on the car tires to indicate the model and performance of the tires. These are the breakthrough points for identifying retreaded tires. The signs of retreaded tires are pasted again after retreading, while the signs of brand-new tires are integrated with the tires. The identification method is to scratch these signs with fingernails. Generally, the signs of retreaded tires are not very tightly pasted, and what can be grasped must be retreaded tires.

 

In recent years, the development trend of foreign car tires is to use more and more tires with large width, large inner diameter and low aspect ratio. At present, domestic cars use more tires with small width, small inner diameter and high aspect ratio. Tires with high aspect ratio have long sidewalls and strong cushioning capacity, and are relatively comfortable, but they have a poor feeling on the road and weak lateral resistance when turning. Conversely, tires with low aspect ratios and large inner diameters have short sidewalls and wide treads. Therefore, the ground contact area is large, the tire can withstand high pressure, the response to the road surface is very sensitive, and the lateral resistance when turning is strong, which greatly enhances the handling of the vehicle. At present, the tires with the largest flat ratio used in domestic mass-produced cars are225/55R16,The tires of many imported luxury cars or sports coupes have reached225/45R17,Some even reach245/40R18. After the vehicle is equipped with tires with large width, large inner diameter, and low aspect ratio, in addition to strong maneuverability, the appearance and visual effects also give people a very powerful feeling.

 

Generally speaking, the tires that the vehicle is equipped with are the best specifications selected by the manufacturer after repeated tests. If a car owner wants to change the tire size, it must be carried out under the guidance of professionals and cannot be done at will, because this involves many problems, and a little negligence may cause harm to driving safety. In addition, low-profile tires will appear moreDelicateSome, in the use of the process should be more attention and care.

 

What is the speed level of the tire??

Answer:Formally, the speed rating indicates the maximum speed at which the tire can carry a specified load under specified conditions. LettersAToZOn behalf of the tire from4.8Kilometer/Hours300Kilometer/Certified speed rating of hours. Commonly used speed levels are: Q 160Kilometer/HoursV 240Kilometer/HoursR 170Kilometer/HoursIn 270Kilometer/HoursS 180Kilometer/HoursY 300Kilometer/HoursT 190Kilometer/HoursWith ZRSpeed higher240Kilometer/HoursH 210Kilometer/HoursZRIf the tire size indication in the instructions for use appearsZR. SuchP275/40ZR17 93W,Then the maximum speed rating("93W"in"W")For270Kilometer/Hours.

In the recent regulations for the standardization of tire marking, except for the continuously variable speedZThe speed symbol and load factor are included in the instructions for all levels except speed.

For example:P225/60R15 95HIt is the tire's instructions, indicating that the maximum load capacity of the tire is690kg, with a maximum speed rating210km/h.

 

Ask:I'm going to buy two new tires, should they be on the front or rear wheels??

Answer:Rear wheels. When operating a sharp turn on a wet road, if your front wheels slip first, your car will continue to walk in a straight line even when turning. This is equivalent to understeer, which can be done by slowing down and then turning along the curve. This allows the car to return to the driveway. But if the rear wheels slip first, the car may flick its tail, which is equivalent to oversteer and will only be more difficult to control. This requires you to make a quick and accurate steering correction in the opposite direction of the curve, which is not a natural reaction. It is easier to control understeer than to control oversteer. In order to maintain the record, the best choice is to buy four new tires of the same brand, specification and model at a time when changing tires.

 

Ask:If I only want to buy a tire, what kind of product should I buy and where should I install it??

Answer:The only proper reason to buy only one tire is to replace the tire damaged by an accident or road hazard, otherwise a full set of four tires is good. When buying, you should look for the same specifications, models, brands and tread pattern design as the replacement tires. Use four-season tires to replace four-season tires. Replace snow tires with snow tires. UseHTire Replacement for Speed ClassHSpeed grade tires. In this way, you will enjoy a safer and more comfortable driving experience.

 

Ask:Tire use skills

Ordinary car tires have no directionality and can be interchanged in principle(Not likeF1Racing tires have strict directionality);

  Jetta is generally recommended per20,000KMThe front and rear tires are used interchangeably(Feixian:The literature I read said that the rear wheels can be moved parallel to the front and the front wheels can be crossed to the back. The reason is that in general, the wear of car tires is greater in the front than in the back, because there is a steering action in the front;The right side is larger than the left side, because the road is curved, and the tire stroke on the right side will be longer.);

  Temporal aging of tires is not obvious, whether aging, wear or mileage and road conditions account for most of the reasons;That is, the driving age cannot be used as the standard to judge whether to replace the tire, but the number of kilometers traveled should be used as the main parameter. The most important thing is the degree of tire wear.(Feixian:It's a pity that we can't find a picture now. We can clearly indicate which pattern must be replaced as soon as possible if it is worn out. PleaseDXLooking);

It is not good to increase the wheel hub blindly, and the braking effect will become worse. Because the braking force of the brake mechanism may be insufficient;

Using too wide tires, comfort and stability are enhanced, but fuel consumption has increased, and braking will also be problematic;

Tires should be used and replaced in pairs as much as possible, by maintaining a pair of tires with similar wear and working conditions to ensure the left and right balance of the vehicle(Feixian:Detailed records should be made of when each tire was replaced, how many kilometers it has been and whether it has been replaced, so that replacement and replacement can be arranged. I also have a bottom in my heart, which tire is what working condition);

General car(Except for luxury cars.)The parameters and indicators of the spare tire are exactly the same as the four tires in use, and can be used interchangeably when the tire has problems. However, it is strongly recommended to replace the broken tire after it is repaired. The spare tire is still used as a spare tire, keeping this tire in good condition for a long time. If the repaired tire is used as a spare tire, it may happen that when you want to use the spare tire, the tire is found to be flat due to slow deflation. Moreover, the newer spare tire, paired with the old tire, also undermines the above principle of paired use.

 Tyre identification

According to national standards, the production number, manufacturer's trademark, size specification, hierarchy, maximum load and corresponding air pressure, Chinese phonetic code of carcass ply, installation requirements and driving direction marks shall be marked on both sides of the tire. The carcass cord material is expressed in Chinese Pinyin. SuchM-Cotton Cord,R-rayon cord,N-Nylon Cord,G-Wire Cord,ZG-Steel wire radial cord tires. The side of the tire is filled,“-”,"□"Symbol or note“W”,“D”Words such as the lightest part of the tire. When installing the inner tube, the valve should be installed with the symbol to average the weight around the tire and keep the tire stable when rotating at high speed. such as an arrow“”It represents a directional tire. Install in the direction of rotation as indicated by the arrow. For high-pressure tiresD5Bsaid,DRepresents the nominal outer diameter of the tire,Bis the section width of the tire in inches.“X”Indicates a high-pressure tire. For low-pressure tiresB-dsaid,Bis the tire section width,dis the rim diameter,“-”Indicates a low pressure tire. Due to the sectionBapproximately equal to section heightHSize of installed rimdCan be pressedd=D-2BCalculations.

For example, Audi cars use tires185/80R1490SType. Tire section width and height ratio(Flat ratio)It is two important indicators to describe the tire size. The cross-sectional width of the tire refers to the maximum distance between the two outer sides of the tire after the tire is inflated as required.5mmis divided as a unit, but the new tire section width tolerance is63%. Section width refers to half of the difference between the outer diameter and the nominal diameter of the rim after the tire is inflated. tire aspect ratio(H/B)Is the tire section heightHand section widthBThe ratio of the diameter is expressed as a fraction after rounding. generally is54 Multiples, such as car radial tires are divided60,65,70,75,80Series.

 

Tire structure Speed Level Maximum speed of tyres with different nominal diameters(hm/h) 10 12 /13 120 135 150radial tireQ 135 145 160radial tireS 150 165 180radial tireH - 595 210Foreign tire specifications diversification, China's tire specifications mark is mainly divided into imperial and metric specifications mark.

 

Imperial specification mark:General cross-section truck tires and car bias tires use this mark. It is mainly as shown in the following section.ANominal section width of tire, unit:in BTyre Structure MarkingCNominal rim diameter, unit:in DLevel Structural signs for radial tires“R”For structural markings of bias tires“-”Representation. The level refers to the specific strength mark of the tire to bear the maximum load, which does not necessarily represent the actual number of plies,

For example9.00Specifications12Tiered tyres, with several actual layers, but with a maximum load2050kg. For example: 6.5R 16 6 P.R. 6.5:Nominal section width of tire(6.5 in) R :Radial tire logo16 :Nominal rim diameter6P.R.:Tyre level is6(The maximum load is635 kgThe corresponding air pressure is3.50kg)

Metric Specification Mark:General radial car tires use this expression, which includes the following contents: ANominal section width of tire, singlemm BNominal aspect ratio of tireCspeed symbolDTyre Structure MarkingENominal rim diameter unit:inchThe nominal aspect ratio of the tire refers to the ratio of the section height to the section width of the tire installed on the theoretical rim.

For example:195/60 H R 14 195 :Nominal section width of tire(195mm) 60 :Nominal aspect ratio of tire(H/B≈0.60) H :speed symbol(210km/h) R :Radial tire logo14 :Nominal rim diameter(14in)

In order to unify the International Organization for Standardization(ISO)The new tire specification mark consists of the following contents: Nominal section width of tire, unit:(mm)

Nominal aspect ratio of tire

Tyre Structure Marking

Nominal rim diameter, unit:in

load index

speed symbol

For example195/60 R 14 85 H 195:Nominal section width of tire(195mm) 60:Nominal aspect ratio of tire(H/13≈0.60) R:Radial tire logo14:Nominal rim diameter(14in) 85:load index(515kg) H :speed symbol(210km/h)All tires for domestic cars are red flag tires.185/80R 14 90Stype radial tubeless tire;Fukang car165/20R14or165/70 R13radial tire;The Cherokee tire logo isP205(or215,225)/ 75R15, here.Pindicates the use of a vehicle,205Indicates section width(mm),75for flatness ratio,RFor the radial tire,15for rim diameter(inch). Tire size(Tire Size)The tire size is printed on the sidewall. There are two ways to express it, namely34*7or7.50-20Such as expressed. The former is a high-pressure tire, and the latter is a low-pressure tire. There are also many signs, suchDFor light vehicles,FFor medium-sized cars,Gmeans a standard vehicle,H,L,JIt is used for large luxury and high performance cars. If one is printed on the sidewallR, such175R13, Indicates that the tire is a diameter tire, wide and long175mm(6.9Inch), installed in the rim diameter13Inch(330mm)On the wheel, it is usually engraved.RADIALWord.

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