Inner tube introduction

Inner tube introduction

Inner tubes are commonly known as inner tubes. Refers to the circular elastic tube with a tire valve used to maintain the internal pressure of the tire. The valve is used to inflate and maintain a certain pressure of air in the inner tube. The inner tube should have good air tightness, heat resistance, elasticity, aging resistance and small permanent deformation. Generally made of butyl rubber.

Inner tubes are air-bearing containers for inflatable vibration damping. They are used as auxiliary air pressure-bearing containers in the inner cavities of tires of trucks, motorcycles, bicycles, and rickshaws. According to the main materials they contain, they can be divided into natural rubber inner tubes and butyl rubber inner tubes. There is another New products are pure butyl rubber inner tubes, such as the "Bolojie" pure butyl rubber inner tubes produced by Zhengzhou Aode Rubber. Butyl rubber inner tube products: refer to using butyl rubber and butyl recycled rubber as the main raw materials, adding EPDM rubber and fillers, additives, anti-aging agents and other auxiliary materials, formulating according to a certain proportion, and mixing and internal mixing , molding, vulcanization and shaping, and then processed into various types of vehicle inner tube products.

definition

inner tube; tube

Butyl rubber inner tube industry: chemical rubber products, tire industry.

Applicable markets: Butyl rubber inner tubes can be divided into truck inner tubes, light truck inner tubes, engineering vehicle inner tubes, motorcycle inner tubes, bicycle inner tubes and rickshaw inner tubes according to specifications, models and supporting tire specifications.

The main properties of butyl rubber inner tubes: Butyl rubber inner tubes have good self-sealing properties and high air tightness. The air pressure of the inner tube after loading is above 8MPA. The high airtight carcass reduces natural leakage of gas. Compared with natural rubber inner tubes, the inflation frequency is lower during use and it is more fuel-efficient during driving. The high temperature resistance of butyl rubber inner tubes is superior to that of natural rubber inner tubes. When the car is running at high speed for a long time, the temperature of the tire cavity is very high, which causes the inner tube rubber to self-vulcanize quickly and affects the service life. Butyl rubber inner tubes are more resistant to aging and have a longer service life. longer.

Classification

Divided by tire use

For example, China's tire national standards, American tire rim manual, European tire rim standards, Japanese tire standards and international tire standards are all classified by use and can be divided into the following types:

1. Car tires - tires installed on cars. They are mainly used for high-speed driving on good roads. The maximum driving speed can reach more than 200 kilometers/hour. They require comfortable riding, low noise, good maneuverability and stability. sex. Most tire structures adopt radial structures. They are divided into different series according to the driving speed requirements. Commonly found in standards and manuals are 95 and 88 series for bias tires, and 80, 75, 70, and 65 series for radial tires.

2. Light truck tires - usually refers to truck tires with a rim diameter of 16 inches or less and a cross-section width of 9 inches or more. This type of tire is mainly driven on highways, and the driving speed can generally reach 80~100km/h.

3. Truck and bus tires usually refer to tires with a rim diameter of 18 to 24 inches and a cross-section width of 7 inches or more for trucks, dump trucks, various special purposes and trailers. The driving roads are relatively complex, ranging from good asphalt roads to poor gravel roads, dirt roads, mud roads, ice and snow roads, and even no road conditions. The driving speed generally does not exceed 80km/h.

4. Construction machinery tires - Construction machinery tires are installed on construction machinery vehicles for specialized operations, such as loaders, bulldozers, excavators, land levelers, road rollers and stonework machines, etc. The driving speed is not high, but the road conditions and load performance used are demanding. Tires mainly use bias tire structure, but French companies such as Michelin (Cantonese pronunciation, called Michelin in Mandarin) also use radial structures. According to the classification of tire section width, it can be divided into two series: standard tires and wide-base tires.

5. Off-road vehicle tires – Off-road vehicles are front and rear wheel drive. Off-road vehicle tires are mainly driven on bad roads such as deserts, muddy fields, soft soil or other roads without pavement. The tires are required to have high passing performance. Off-road tires often use low air pressure, and some also use pressure-adjusted tires. According to the road conditions to adjust the tire pressure. In order to improve off-road passability, measures such as widening the tire section and rim width, and reducing the rim diameter are generally adopted to increase the ground contact area and reduce the ground contact pressure. In addition to the bias tire structure, the tire structure also uses a radial structure.

6. Agricultural and forestry machinery tires - Agricultural tires are mainly used on tractors, combine harvesters and agricultural machinery vehicles. Forestry machinery tires are installed on forestry tractors and forestry machinery to carry out forestry operations such as logging, gathering, shoveling and excavation. The characteristics of these two types of tires are that they do not require high driving speeds, but their use conditions are harsh. They are often driven on poor field roads, hard stubble fields or gravel mountain roads, or even roads without pavement. The tires are easily scratched. or cut. Another feature is intermittent operation, short mileage, but long service life, so the tires are required to have good flex crack resistance and aging resistance. Tires are mainly bias-ply structures, but radial structures are also used.

7. Industrial vehicle tires - mainly used for pneumatic tires, semi-solid tires and solid tires on industrial vehicles. Divided into battery car tires, forklift tires and flatbed truck tires, etc.

8. Motorcycle tires - tires used on motorcycles. Including motorcycle tires, moped tires and small wheel diameter motorcycle tires.

9. Aviation tires - pneumatic tires used on aviation aircraft.

10. Special vehicle tires - including gun truck tires, tank tires, armored vehicle tires, desert tires, explosion-proof vehicle tires, etc.

11. Liqi tires - pneumatic tires for bicycles, tricycles and trolleys. Divided into bias tires and radial tires. The fundamental difference between radial tires and bias tires is the carcass. The carcass of bias-ply tires is made of diagonally crossed plies; while the carcass of radial tires is made of a polymer multi-layer cross material, with the top layer being several layers of steel belt cords made of steel wires, which can reduce the tire from being punctured by foreign objects. probability.

The cords of bias tires are arranged in diagonal lines, hence the name. The characteristic is that the tread and sidewall are strong, but the sidewall stiffness is large and the comfort is poor. Due to the large movement and friction between the ply layers at high speed, it is not suitable for high-speed driving. As radial tires continue to improve, bias tires will be largely eliminated. The cord arrangement direction of radial tires is consistent with the tire meridian section, and its ply layer is equivalent to the basic skeleton of the tire. Since the tire has to bear a large tangential force when driving, in order to ensure the stability of the cord, there are several layers of belt layers (also called tightening layers) made of high-strength, non-stretchable materials on the outside. , the cord direction has a larger intersection angle with the meridian section. From a design point of view, bias-ply tires have many limitations. For example, due to the strong friction of the crossed cords, the tire body is prone to heat, thus accelerating the wear of the tread pattern, and the cord layout cannot provide excellent quality. The controllability and comfort of the radial tire are better; the steel belt in the radial tire has better flexibility to adapt to the irregular impact of the road surface, and is durable. Its cord structure also means that there is less friction when the car is driving than the bias line. More friction, resulting in longer tread life and better fuel economy. At the same time, the characteristics of the radial tire itself make it possible for the tire to be tubeless. Tubeless tires have a recognized advantage, that is, when the tire is punctured, it does not burst like a bias-ply tire with an inner tube (which is very dangerous). Instead, it allows the tire to maintain air pressure for a period of time, improving the safety of the car. driving safety. In addition, radial tires have better grip than bias-ply tires. Compared with ordinary bias tires, radial tires have greater elasticity, good wear resistance, low rolling resistance, good adhesion, good buffering performance, large load-bearing capacity, and are not easy to puncture; the disadvantage is that the sidewalls are prone to cracks due to large lateral deformation , resulting in slightly poor lateral stability of the car, high manufacturing technology requirements, and high cost.

How to store inner tubes

1. Inner tubes packaged in complete sets should be placed vertically on the shelf. Inner tubes placed for a long time should be regularly rotated and changed to avoid deformation of the inner tube.

2. The inner tubes are in storage. The inner tubes should be stored in batches according to the production or storage time, first in, first out, and used in order.

3. Inner tubes should be stored in a dry warehouse away from the sun and rain, and should not be excessively ventilated. Large-scale inner tube warehouses should be equipped with thermometers and hygrometers. The inner tube temperature should be controlled between -10 degrees and 30 degrees, and the relative humidity should be 50% to 80%.

4. When the inner tube and the rim are installed and stored together, the inner tube should be slightly inflated so that the inner tube can withstand a certain amount of pressure.