Use knowledge of car tires

cartireUse knowledge
Someone willtireIt's a good idea to compare shoes worn by people, but I have never heard of the story of a shoe sole bursting and killing people, and news of car crashes and deaths caused by tire bursts is heard from time to time. From this perspective, the importance of tires to vehicles far exceeds the importance of shoes to people. Therefore, the correct use of tires not only affects the running state of the car, but also has an important impact on the safety of the car.
To use tires correctly, we must first understand the tires, and to understand the tires, we must first understand the markings on the tires. For example, the tire label of Guangzhou Accord 2.3i is 195/65R15 (91V), which means the tread width is 195 mm, the aspect ratio is 65, R15 refers to radial tires, the tire inner diameter is 15 inches, and the load index 91 means the maximum load capacity is 615 kg, and the speed The code name is V, which means that the safe speed is 240 kilometers.Some tires are also marked with M+S, indicating that it is suitable for mud and snow, while TUBELESS indicates noInner tube, TreadWear said tread wear index, etc. For car tires, one of the important parameters is the aspect ratio, that is, the aspect ratio, which is obtained according to the formula (H/W)×100%, where H refers to the height of the tire cross section, and W refers to the two tires. The maximum width of the side. The smaller the value of the formula, the flatter the cross-section of the tire. Some car owners prefer to switch to low aspect ratio tires in order to make the car have better driving stability. For tires with different aspect ratios, it is best to use the same outer diameter as the basis. If the tire inner diameter and the rim diameter are different If the aspect ratio is low, the tread will appear wider and the contact surface will be larger, making the car running and steering more stable. If the inner diameter of the tire is not the same and must be replaced with the rim, the scope is relatively large. For example, the matching problem of the wheel drum, the suspension geometric parameters, the turning radius, etc. may all be related. You must be cautious, preferably with the car factory. Click to select.
For the daily use of tires, attention should be paid to tire pressure. Some people think that a puncture is caused by too much pumping, and that the problem of tire underpressure is not big, which is very one-sided. The driving speed of a general car is very fast. The shape of the tire is in a high-frequency alternating state. If the air pressure is insufficient, the deformation will increase. The tread pattern on both sides of the tread will be excessively worn. The carcass cannot withstand the pressure on the ground. Distortion and deformation, generating high temperature and accelerating the wear of the tire, eventually leading to a puncture. If the air pressure is too high, the tire will be too hard and lose its due elasticity and shock absorption ability. Not only will the grip become worse, the excessive wear of the center tread will cause uneven tread depth. The tire may also be unable to withstand excessive under high-speed operation. The puncture occurs due to the expansion pressure. Therefore, if the tire pressure is too high or too low, there is a danger of a puncture. The pressure problem should not be underestimated. The standard tire pressure, including the spare tire pressure, should be maintained in accordance with the manufacturer's requirements. The tire pressure can be measured with a tire pressure gauge by itself, but it must be measured at the normal temperature of the tire, because the result of the measurement in the hot tire state is inaccurate.
In addition, tires should be interchanged every 10,000 kilometers. Why do they need to be interchanged? Because the engine of a general car is placed in the front,Front bridgeandRear axleThe load distribution is different; during the braking process of a car, due to inertia, the load of the front wheels usually accounts for 70%-80% of the total load of the car. Since the load on the four tires is not equal, it will inevitably cause the front wheel tires. The wear is greater. In order to alleviate this phenomenon, the best way is to exchange positions.
During the operation of the car, you should try to avoid sudden acceleration, sudden braking and sudden steering. This is not only good for the mechanical performance of the car itself, but also good for the life of the tire. If you repeatedly perform abnormal driving such as rapid acceleration, rapid braking, and rapid steering, it will cause rapid deformation of the tire, uneven wear of the tire crown, tearing of longitudinal grooves, rise of internal temperature of the tire, and fatigue of the tires, which will cause the tire to burst easily. Dangerous state.
Tires should be checked regularly for dynamic balance. Tire balance is divided into dynamic balance and static balance. Dynamic imbalance will cause the wheels to sway and cause the tires to produce wave-shaped wear; static imbalance will produce bumps and bounce, and often cause flat spots on the tires. Therefore, regular detection of balance can not only prolong the life of the tire, but also improve the stability of the car when driving, and avoid traffic accidents caused by tire swing, bounce, and loss of control during high-speed driving.
Two tires of different specifications cannot be mixed in the same vehicle. Radial tires and bias tires have different lateral forces. If two different tires are installed on the same axle at the same time, it will cause over-steer or under-steer, or easily cause sideslip. The lighter one affects the car’s handling flexibility and the heavy The person will have a car accident. Therefore, tires of different structures cannot be mixed on the same axle. When replacing tires, you should go to a professional shop with special machinery and equipment. Avoid the old methods of using sledgehammers and crowbars to avoid injury to the tire hub.
As for the elimination of tires, it depends on the degree of wear of the tires, and they must be replaced when the signs of wear are revealed. Generally speaking, the recommended service life of the tire is about 40,000 kilometers. If the driving mileage is less, it is also recommended to replace it when the use time exceeds two years. Because the rubber material is affected by the environment, it will deteriorate and age over time, and it is easy to produce turtles. Crack, there is no worry about accidents when using.