Trailer leaf spring how to do maintenance and maintenance?

Leaf spring is one of the most widely used elastic components of automobile suspension, also known as leaf spring, composed of a number of pieces of equal width and unequal length alloy spring, generally presents a symmetrical section structure, the thickness of each spring can be the same or different.

Compared with other types of elastic components, the leaf spring structure is simple, low cost and maintenance costs, strong rigidity, load-bearing, not only can play the role of shock buffering, but also has the function of guidance, transmission of force and torque in all directions, but also through a certain combination of linear or nonlinear elastic characteristics. Therefore, leaf springs are widely used in trucks, trailers and other freight vehicles, as well as in some passenger vehicles, off-road vehicles, vans and pickup trucks.

In the process of daily use, some owners believe that a leaf spring is a stack, should not be too fragile, so they ignore the standardized use and maintenance of the leaf spring. Some leaf springs are broken because they have been used for too long beyond the service life, and it is normal for some leaf springs to be damaged in the early stage of use is caused by inappropriate use and maintenance.

Here, DARO axle summarizes some common reasons that are easy to cause damage to the trailer leaf spring of the trailer:

1. The vehicle is overloaded for a long time

Vehicle accessories are generally designed according to the load of the vehicle, and the trailer leaf spring is no exception. If the vehicle often carries more than the rated load of goods, or there is often partial load, the leaf spring will appear too much bending stress in use, which greatly weakens its fatigue strength.

Therefore, in the daily use of vehicles, in order to extend the service life of the leaf spring, legal transportation and uniform loading are essential. If the vehicle is often in a heavy or heavy state, it is necessary to consider the modification of the leaf spring to the original car, in order to enhance the force capacity of the leaf spring and extend the service life.

2. Driving speed is too fast

When the vehicle running speed is too high, the inertia of the body and goods will be enhanced, especially on the rugged road conditions, too fast speed will lead to leaf spring acceleration fatigue, in the long run will inevitably accelerate the spring damage.

Develop good driving habits, properly control driving speed, so that the vehicle according to different road conditions to maintain different economic speed, not only can ensure driving safety, but also can save fuel, reduce the loss of parts.

3. The bending speed is too high

When the vehicle passes through the turning section, the centrifugal force will be generated outwardly, and the load pressure of the outer leaf spring will be stronger than that on the straight section. The faster the speed, the greater the load borne by the leaf spring, the more easily it will lead to the damage of the leaf spring.

It is recommended that owners slow down when turning, which is not only safe, but also can reduce the loss and failure of vehicle parts, but also can protect goods, reduce goods damage, improve operating income.

4. Frequent emergency braking

Frequent emergency braking is also one of the reasons for premature damage of leaf spring. When the vehicle is under emergency braking, the body and goods will continue to move forward under the action of inertia, causing excessive bending stress and tensile stress to the front side leaf spring. Once it exceeds the range of its stress, the leaf spring may be broken and damaged.

It is recommended that the owner develop the habit of predictive driving, the speed should not be too fast at ordinary times, early oil collection braking, such as conditions permit can be matched with the use of auxiliary braking device.

5, the spring lubrication is poor

Leaf springs also need to be well lubricated. When the spring is bent and deformed under stress load, there will be extrusion, tension and friction between the two adjacent reeds, and the two friction surfaces will generate forces in two different directions, resulting in the rise of the temperature of the spring and surface damage. When the load increases, the friction also increases, and once the stress concentration point reaches the fatigue limit, monolithic or multilateral fracture will occur.

When the spring is installed, grease should be evenly applied on both sides of the spring, and more attention should be paid to maintenance and regular lubrication at ordinary times. In this way, it can not only prevent spring surface strain, help the spring to dissipate heat and cool down, but also reduce abnormal sound, so that the spring can cope with the change of friction coefficient more calmly, and reduce the possibility of reed fracture. In addition, it can also reduce the erosion of dust, soil and rain on the reed and prevent rust.

In addition, in the maintenance process, we should also pay more attention to the fastening of the riding bolt and the center bolt, to avoid the damage of the leaf spring caused by the loosening of the bolt, the lifting lug butter is indispensable, and the upper limit position of the auxiliary steel also needs to play more grease.

If one or several springs are replaced separately, the old reed that does not need to be replaced should also be properly adjusted in order to reduce or avoid the inconsistent strength of the new and old reed, the existence of gaps after installation, the uneven force of the reed and the aggravation of the wear of the reed.

One of the most important points is: try to choose the regular manufacturer of leaf spring, after all, it is related to driving safety, choose the product should be cautious, if the quality of the product is not qualified, follow-up no more, no more careful maintenance and maintenance can not change its congenital deficiency. The trailer leaf spring sold by DARO Group is specially designed and created for freight vehicles. It adopts silicon manganese spring steel, adding high strength heat treatment process, stable and reliable strength, elasticity and hardenability. The surface is treated with rust prevention, isolation, moisture-proof, oxidation prevention and corrosion prevention, extending the service life and improving the protection force.