Aircraft tires generally use tubeless, twin tread structures, which means they are not solid tires.
The airplane is designed without inner tube, which is mainly to facilitate disassembly, assembly and maintenance. The tire can be directly inflated before flight, and the high-strength seal ring of the tire can ensure that the gas up to several atmospheric pressures in the tire does not leak.
In addition, aircraft tires are filled with nitrogen. Compared with air, nitrogen has a smaller volume change due to thermal expansion and contraction. Inert gas can also protect tire materials from oxidation to a certain extent. Its non-combustible and non-combustible characteristics can increase the safety factor.
Tires are components on airplanes that require very high safety and reliability.
Aircraft tires are mainly used to support the weight of the aircraft, provide horizontal friction to help the aircraft accelerate during takeoff, buffer the impact of the aircraft during landing when landing, and generate the necessary braking friction to help the aircraft decelerate and brake during landing.
How much weight does an airplane tire carry?
Take the Boeing 777 aircraft as an example. The total weight of the aircraft before takeoff is about 300 tons. These weights are mainly borne by the 12 wheels of the main landing gear, and each wheel bears an average weight of 25 tons.
At the same time, the take-off speed of the aircraft is 300-350 kilometers per hour, and the landing speed is above 200 kilometers per hour. The tires of the aircraft have to withstand strong vertical impact loads and frictional loads when accelerating in the horizontal direction.
One point very different from car tires is that car tires are usually insulated, but aircraft tires need to have good electrical conductivity. In this way, when landing, it can release the static electricity generated by the friction between the fuselage and the air.