1 Under certain load and driving conditions, the tires of HuaYa forklift have a suitable tire pressure. When the tire pressure is lower than the standard value, the radial deformation of the tire increases, and the two sides are excessively deflected, so that the crown is two. Side grounding, the inner wall of the sidewall is pressed, the outer wall of the sidewall is pulled, and the cord in the tire body is deformed and alternating stress. Periodic compression deformation, which will damage the fatigue of the rewinding cord, and increase the relative slip between the ply of the tire and the tire and the ground.
The amount of heat generated increases, the temperature of the tire rises sharply, the tensile strength of the rubber is lowered, the cord is loose and partially delaminated, and a puncture occurs when an obstacle is encountered. The uneven pressure on the tread causes severe wear on the shoulder portion, resulting in a “bridge effect” in which the tread is toothed or wavy. Tire pattern recesses are easily embedded in nails and stones on the road, causing mechanical damage.
The rolling resistance of the carcass is increased and the fuel consumption is increased. Tests have shown that when the tire pressure is lower than 20%-25% of the standard value, the fuel consumption is increased by 20%. When the tire pressure is higher than the standard value, the center of the crown is grounded, the contact area between the tire and the road surface is reduced, the load per unit area is increased, and the wear in the middle portion of the crown is intensified. The cord of the tire is excessively stretched, the stress of the carcass cord is increased, the fatigue process of the cord is accelerated, and the cord is broken, causing the tire to burst in the early stage.
2 Under certain load and tire pressure, the vehicle speed increases, the deformation frequency of the tire, the vibration of the carcass and the circumferential deformation of the tire and the lateral distortion (formation of static waves) increase, and the heat generated by friction per unit time increases. The performance of the tires is degraded, and even ply cracking and tread peeling occur, which accelerates the wear and damage of the tire.
3 Under a certain tire pressure, the tire overload will increase its flexural deformation, and the stress of the cord and the cord will increase, which will easily cause the cord of the sidewall to be broken, loose and delaminated, and the force of the carcass cord will be Exceeding the design allows stress and tire grounding pressure, the heat generated increases, the carcass temperature rises, and the load carrying capacity decreases. At the same time, wear is caused by the contact between the shoulder and the ground, especially in the case of obstacles, even a small stone will cause the crown to blast. Practice has proved that when driving on turning and uneven roads, when the tire load exceeds 20%, the mileage will be shortened by 35%; when it exceeds 50%, it will be shortened by 59%; when it exceeds 1%, it will be shortened by more than 80%.
4 Road conditions have a great influence on the service life of the tire, which affects the friction between the tire and the ground and the dynamic load on the tire.
5 high temperature will reduce the tear strength, elongation and hardness of the rubber, which will reduce the adhesion strength between the rubber and the cord, and also accelerate the aging of the rubber. For tires that are exposed to high temperatures, especially those that have aged, it is easy to tear the crown pattern when it is slipped or rolled over an obstacle. Cracks in the sidewall rubber and severe deformation of the sidewall cause the carcass layer cord to separate from the rubber. Once the tire partially encounters a sudden load, it is likely to
It is a puncture.
6 When the tire is subjected to grease, acid and alkali corrosion and long-term high temperature, the physical and chemical properties of the tire will change, the bearing capacity will be greatly reduced, and the tire will be easily blown out during use. In addition, the oil-corroded tires may show blockage of the sealing layer, small area rubber peeling off of the tire mouth, and separation of the carcass cord from the rubber. Since the patch does not have affinity with the oil-containing rubber, even if the damage to the tire is small, the possibility of repair is lost.
7 Due to the different load distribution of the front and rear axles, the different working characteristics of the driving wheel and the steering wheel and the difference of the road surface conditions, the wear status of each tire is inconsistent. If the same axle is not replaced with the same factory, the same size, structure, level and pattern The tires will accelerate the wear of the tires.
8 In use, if you do not pay attention to reasonable matching and regular transposition, resulting in uneven load on the tire, it will accelerate tire wear.