Can the trailer disc axle be popularized?

With the relevant departments on the semi-trailer load more and more strict supervision, lightweight gradually become the industry's focus. Under the same load limit, the lighter the weight of the trailer itself, the more goods it can load. Therefore, many owners also prefer lightweight trailers or trailer accessories.

As we all know, the use of disc trailer axle and air bag suspension, is one of the ways of lightweight trailer. However, in the promotion process of disc axle, it has been questioned a lot. Many owners think that it is not suitable for use in semi-trailer at all, for the following reasons: the temperature rises quickly, the water is easy to break, the braking force is small, and so on.

As the country highly respected brake mode, disc axle really so unbearable? Not so. Next let's focus on a few owners of the problem, a detailed analysis.

1. Is the disc axle heating up too fast?

Why do disc axles heat up faster than drum axles? It starts with the structure of the disc axle.

Compared with the traditional drum axle, the disc axle is smaller in volume, especially the friction area during braking, compared with the drum axle is much smaller. Because of the small friction area, the disc axle does rise faster than the drum axle when braking under the same brake load.

However, we do not forget that the disc axle brake disc, friction plate is directly exposed in the air, its heat dissipation rate is much faster than the drum, so although the temperature is fast, cooling is also very fast, generally will not appear overheating.

The heat attenuation performance of disc axle is higher than that of drum axle even if temperature rise occurs. According to the experimental data comparison, the friction plate temperature of the drum brake reaches more than 300 degrees, the friction coefficient will decrease by 40%-50%; When the temperature of disc brake friction plate rises from 100 degrees to 400 degrees, the friction coefficient hardly changes.

What if some vehicles do need to run mountain roads frequently? It can also be equipped with hydraulic retarder and other auxiliary braking devices. The hydraulic retarder is not only light in weight, but also stronger in reliability. With the help of it, the friction strength of the brake disc can be greatly reduced. It can not only ensure the braking strength, but also effectively avoid the overheating of the brake disc, and also prolong the service life of the disc brake.

2. Small disc trailer axle braking force?

It is also because disc axle and drum axle compared with the braking friction area is smaller, its braking force, especially for heavy semi-trailer full load, is smaller than drum axle to a certain extent, which is also one of the reasons why disc axle is widely used in passenger cars and less used in semi-trailer.

But this problem is not irreconcilable, as we mentioned above, for those trailers that often carry heavy goods, or trailers that often need to run mountain roads, they can be used with hydraulic retarder and other tractor braking devices, which can make up for the shortcomings of small disc axle braking.

In addition, owners need to understand that although the disc axle is used alone when the braking force is less than the drum axle, but it is better than the drum axle in the braking response speed. Drum axle braking system has a set of complex structure, such as the brake drum, pump, arm adjustment, and so on. When the owner steps on the brake, these components need to react one by one, and finally realize the braking, which is to a certain extent full of response speed. Disc axle is different, it does not have so many switching devices in the middle, the pump can push the caliper directly for braking, so the response speed is faster, more timely braking.

It can be seen that once the disc axle is matched with the hydraulic retarder, the super combination of fast braking response speed, strong braking force and more stable and reliable braking will be realized. If ABS and EBS systems are installed on the vehicle, it can prevent the wheel from locking in case of emergency braking, and enable the trailer to stop smoothly in the shortest distance, far better than the traditional drum axle.

3. Disk axle is easy to be damaged by water

In the past, many owners in the drum axle, like to use water to cool the axle. But after the change of disc axle, this practice is very undesirable, why?

Drum axle because the braking system is wrapped in the brake drum inside, is a closed structure, in the process of vehicle driving natural cooling speed is very slow, so the need for water cooling. However, the disc axle is not closed structure, the cooling speed of the vehicle in the process of driving is very fast, there is no need for additional water cooling.

In addition, disc axle in the absence of an auxiliary device, if you encounter a long downhill need a long time continuous braking situation, especially when the vehicle load is relatively large, the brake disc and friction plate temperature is very obvious, even can reach 700° in individual cases, if the brake disc is red with cold water directly on, the temperature drops several hundred degrees instantly, It is easy to destroy the brake disc. Therefore, the shower cooling device is not suitable for disc axle.

That the owner asked: in rainy days, the disc axle is not very easy to break?

No, when the water is cooling, the disc axle is easy to break because a large amount of cold water is poured on the red brake disc at the moment. In contrast, the rain axle by the water is continuous, uniform and non-concentrated, so it will not lead to the destruction of the brake disc, and the vehicle equipped with a hydraulic retarding device is even more so.

In addition, the owner needs to understand that after the trailer wading, the disc brake through one or two braking, the performance can be immediately restored, but the drum brake after a dozen consecutive braking, the performance of the friction sheet can be restored. From this point of view, the water attenuation performance of disc axle is better than drum axle.

Thus, for disc axle, as long as it is used properly, its safety and reliability can be guaranteed, but bear in mind that heavy vehicles or owners of bad road conditions, in order to drive safety, if the use of disc trailer axle, or with hydraulic retarders, ABS, EBS and other use.

In addition, when the owner chooses the disc axle, he should not blindly believe the words on the advertisement, but also shop around and do more investigation. Only the products that can withstand the test of the market and users can guarantee the safety of travel. For example, DARO disc axle, the selection of 20Mn2 high-strength alloy seamless steel pipe, from the raw material to ensure strength, toughness and lightweight, at the same time with one-piece heat treatment molding technology, three-hole boring finishing, medium frequency induction treatment and other more than ten processes, the finished products are tested before delivery, to ensure quality standards, stable and reliable.