Three common semi-trailer tire abnormal wear should be noted
Because semi-trailers have a larger loading capacity than single vehicles, they have now become the mainstream means of transportation in the logistics market. Although there is no power transmission, but the abnormal wear of trailer tires often exist. Today, I summarize the 3 common wear conditions and solutions, I hope to help the majority of trailer users.
1. Fixed-point grinding tires
Turning tires, see whether each time to stop in the same part, the vehicle dynamic balance problems, may be the brake drum wall thickness difference is more (can be unloaded later after the tire will be fixed with bolts to the brake drum and then turn to try to determine, can also be used in the axle fixed on a percentage of directly playing the outer circular runout ≤ 2mm, runout away from the super poor should be replaced). And then dismantle the dust pan, check the inner circle of the brake drum is out of round (at this time out of round should not be greater than 0.5mm), such as the discovery of out of round, and then remove the tires, the brake drum will be fixed, check the inner circle of the jump situation, the difference between the two data is larger, belongs to the problem of the steel ring should be switched to the steel ring; data is not a big difference, is generally the drum loss of the drum pumping round should be replaced with a brake drum or boring drums. When the above check does not find a problem, should check the suspension system whether there is a problem, in the normal loading of the vehicle, the balance arm of the suspension should be basically horizontal. Due to the different height of the tractor, the suspension system and the main vehicle does not match, the axle axle load force is not uniform, the force is small axle in the braking is easy to hold dead, due to the use of the brake drum more or less in the process of a little bit out of round, so in a certain point of hold dead the chances are relatively high, resulting in the fixed point of wear and tear, encountered in this case should be looking for the vehicle factory for inspection, adjustment.
2. Jagged wear
Refers to the tire shoulder parts, tread wavy wear. The reason for the formation of the vehicle is driving, the tire forward and the direction and the direction of the vehicle driving a certain angle, the tire to maintain the same direction of travel with the vehicle, you need to constantly more positive direction. If the front axle of the trailer, this problem, indicating that the ends of the axle and the midpoint of the traction pin is not formed by the isosceles triangle, that is, the axis of the trailer and the axis of the axle is not perpendicular to the axle; if the front axle is no abnormality, and the back of the axle abnormality, the rear axle and the front axle is not equal to the axle spacing, need to be readjusted to within 2mm (pay attention to the inspection, the vehicle should be parked in the smoother site, and the vehicle should be in the straight line direction of back and forth a few times! ), at the same time to check whether the U-shaped bolt is loose, whether the tension rod rubber sleeve is damaged. If there is a phenomenon of dumping when the vehicle is traveling, the position of the traction pin installation may not be on the axis of the trailer, and it is necessary to check and adjust it at the vehicle factory.
In addition, if both sides of the tire appear more serious, it means that the axle is not well fixed, i.e., the tension rod rubber sleeve is worn or the U-bolt is loose, and after the vehicle is turned left or right, it will grind both sides of the tire, respectively. In addition, bearing clearance is large, will also appear such wear.
3. Crown/shoulder wear
Serious wear in the middle of the tread (crown wear) is caused by long term high tire pressure, too wide tire tread, too narrow rims, and serious wear on both sides of the tread (shoulder wear) is caused by long term low tire pressure, too narrow tire tread, too wide rims, so you should check the tire pressure and choose the right rims for this kind of problem.
The matching problem of steel rims is the most easily ignored, including some professional manufacturers make this mistake.