Causes and solutions of eccentric wear of automobile tires[汽车修理知识]

existcarIn the four-wheel alignment detection, the driver’s friends often come to ask for a solutiontireThe problem of eccentric wear.Some vehicles found that the toe-toe value is too large in the positioning test. After inspectiontireHas been eccentrically worn. As far as vehicles are concerned, most of the eccentric wear of the tires is concentrated on the front wheels, and the eccentric wear of the inner side of the tire is most common with a negative toe value.The eccentric wear of the rear wheel is generally caused by the accident, repairing, changing the original design geometric angle of the tire, or drivingRear axleThe geometric angle of the suspension part is changed due to collision damage and deformation, which affects the tire's inability to rub against the ground at the correct angle during normal driving, resulting in eccentric wear of the tire. Some people think that the eccentric wear of the tires is caused by the excessive camber angle of the wheel, but in fact, the eccentric wear of the tires is largely caused by the excessive toe value. Based on the experience summarized by the technicians who have been engaged in four-wheel alignment for many years and the analysis of a large amount of positioning detection data, it is believed that the correct toe value can effectively avoid the eccentric wear of the tire. Causes and solutions of eccentric wear of automobile tires It is very rare that the deviation of the maximum total turning angle of the steering wheel, the incorrect camber angle and the kingpin inclination angle lead to the eccentric wear of the tire. In actual driving, the car travels in a straight line most of the time. However, the maximum total turning angle during sharp turns, reversing and U-turning will not be used for a long time, so the eccentric wear caused by it is also minimal. In the four-wheel alignment test, even if the wheel camber angle is too bad, it is difficult to observe the eccentric wear caused by it, because the current vehicles basically use low-pressure tires or ultra-low-pressure tires. The flexibility and random deformation characteristics of this type of tire when it comes in contact with the ground largely offset the eccentric wear of the tire that may be caused by the camber angle of the wheel. Big. For example, we can often see that some empty trucks on the highway have specially designed variable rear wheel camber in order to reduce the friction between the wheels and the ground and reduce the rolling resistance, and the large change in the camber angle is almost 10°. According to observations, this kind of car did not appear to be aggravated by the eccentric wear of the tires as imagined. Based on this, it can be seen that such a large camber angle has failed to cause eccentric wear of the tire, and the camber angle of a vehicle with low-pressure tires is only about 30', and it is even less likely to cause eccentric wear of the tire. From the design point of view, in order to restrain the deflection caused by the camber angle of the car in straight driving, a certain toe value is set for the car. However, due to the various road conditions of the car and the existence of factors such as bumps, collisions, and mechanical wear, even if it is a strong car, its original positioning angle will gradually change the original toe value due to the above reasons. . Some values ​​can be immediately felt during driving, such as the caster angle of the kingpin, the camber angle, and the more serious changes in the toe value of the rear wheels. The relative errors of these kinds of values ​​that are too large can adversely affect the straight-line driving performance of the vehicle. However, the toe value of the front wheels is difficult to detect during driving. Due to the equal distribution of the toe value of the front wheels, it is difficult to detect the change of the toe value even if one of the front wheels is impacted. Therefore, it can only be judged by observing the wear condition of the tire.