How to prolong the service life of tires

2022-08-13
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How to prolong the service life of tires

data show that the value of automobile tires accounts for 1/5 of the total value of automobiles and 10% - 20% of transportation costs. Because this brings strong market space for power batteries, extending the service life of tires is of great significance to improve the economic benefits of automobile transportation. The correct operation of the driver plays a key role in the service life of the tire. The maintenance quality of the vehicle chassis by the vehicle warranty personnel is also closely related to the service life of the tire. In addition to the toe in of the front wheels, we should also pay attention to the following aspects

1. parallelism of front and rear axles

generally, the axles of cars are connected to the frame through suspension, and the positions between them are required to be parallel and perpendicular to the longitudinal beam of the frame. The parallelism of the front and rear axles can be obtained by measuring the distance between the axes at the left and right ends of the front and rear axles. If the axial distance between the left and right ends is different, or exceeds the specified value (generally not more than 5mm), that is, when the parallelism between the two shafts exceeds the standard, the tire will roll and slide while driving, thus increasing wear

according to the research, when the skew angle of the front and rear axles of the car is 0.053 radians, and the car runs at an acceleration of M/s, the normal wear of the tire increases by 19%; When the skew radian is 0.105, the experimenters need to maintain a high degree of concentration and drive at the same acceleration, and the wear will increase by more than 50%. For example, for an eql090 car, eight tires were worn out in two months due to the horizontal bending of the left and right half axle casings of 6mm. After replacing the casings, the fault was eliminated. Therefore, the tire damage caused by the non parallelism of the front and rear axles is amazing. In addition, when the tire runs at an angle for a long time, the tread is easy to form circumferential serration; If the deflection direction changes from left to right, the tread wear is relatively flat. The main reasons for the non parallelism of the front and rear axles are:

1) the looseness of the U-shaped bolt leads to the skew or front and rear movement of the axle

2) the leaf spring is broken, especially the first one, which deflects the axle backward

3) the wheel hub bearing is loose and the front and rear axle or halfshaft sleeves are horizontally bent, resulting in unequal wheelbase on the left and right sides. Because it is biodegradable

4) the leaf spring seat hole, leaf spring pin and bushing are seriously worn and loose, resulting in unequal wheelbase on the left and right sides

5) the deformation of the frame makes the front and rear axles work in a skewed state for a long time, which also has a great impact on the wear of tires. Therefore, regular inspection and maintenance of the front and rear wheelbase is of great significance to reduce tire wear

2. the brake device is not working well

the technical condition of the brake device not only affects the safety of driving, but also seriously affects the service life of tires. The wear, fracture, deformation and improper maintenance of brake device parts during driving will make the brake bite, and the tire drag and slip in the rolling, resulting in abnormal wear. If the rear wheel of one side of a trailer bites while driving, it slides 100m left and right, and the tread is worn off by about 3mm. The causes of brake biting are generally the following:

1) the brake friction plate is poor, the quality is not up to standard, and the rivets are loose

2) the brake drum is out of round and the shoe clearance is improperly adjusted

3) the hub bearing is loose, causing the center of the brake drum to swing

4) the elasticity of the brake shoe return spring is weakened, and the shoe pin is stuck, making it difficult or impossible for the brake shoe to return

5) the brake base plate is deformed or the working surface of cam and shoe end is worn and deformed

6) the blockage of the brake pipeline is related to the rest of the general public, so that the brake shoes cannot be completely returned after the brake is released

7) the exhaust valve of the pneumatic braking device exhausts slowly

8) the contact between the friction plate and the brake drum is poor, and the braking is rough, resulting in spalling damage to the tire crown

9) the hydraulic braking device has biting braking, which is caused by: the rubber parts are swollen, the cylinder barrel is jammed, the master cylinder push rod is too long or the return spring is insufficient; The piston blocks the balance hole; The oil pipe is blocked by oil dirt

3. Technical conditions of other parts of the chassis

improper use, operation, assembly and adjustment of some parts on the chassis also endanger the service life of tires

1) the leaf spring is too soft or broken, and the tire rubs the underbody or fender during driving, causing scratches

2) the rim is deformed or loosely attached to the brake drum during installation, and the wheel swings during driving, causing wear

3) the steering angle of the front wheel is too large, and the steering rod or leaf spring collides with the tire, causing damage

4) the transverse pin of the steel plate safety clip is installed in the wrong direction. Once the nut is loosened, the bolt may scratch the tire, and even cause the tire to be scrapped

5) the transmission shaft is not installed correctly, which makes the angular speed of the universal joint unequal, causing the wheels to speed up and slow down, accelerating tire wear

6) the steering device fails, causing the front wheels to sway and the tires to wear. In short, ensuring the good technical condition of the chassis is of great benefit to extending the service life of the tires. (end)

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