Can the rear axle of a semi-trailer choose a disc brake axle?

With the prevalence of lightweight trends in the freight industry, disc brake axles are becoming more and more popular among car owners. The disc brake bridge does not have a 360-degree wrapped brake drum, and the brake transmission components have also been optimized, so its own weight has obvious advantages.

After the introduction of GB7258-2017, it is required that three-axle fences and three-axle grille semi-trailers must be installed with disc brake bridges and air suspension, otherwise it will affect the registration of vehicles. But everyone knows that the braking force of the disc brake axle is not as good as that of the drum brake axle. Will it affect the braking effect when used on a semi-trailer? Is the disc brake axle reliable for the rear axle of a semi-trailer?

It is true that compared with the brake drum and brake pads of the drum brake axle, the brake friction area of the disc brake axle is indeed smaller, which leads to the braking force output by the disc brake axle is smaller than that of the drum brake axle under the same load. But this "less than" is relative. Although the braking force of the disc brake axle is small, it is more than enough to meet the braking needs of standard vehicles.

In addition, because the disc brake bridge cancels the cumbersome and complicated brake transmission mechanism of the drum trailer axle, when the owner steps on the brake pedal, the brake disc can be directly pushed by the sub-cylinder to push the caliper, that is to say Disc brakes react faster than drum trailer axles. This speed of response is used in conjunction with ABS or EBS systems to maximize the advantages of these auxiliary devices.

Let’s talk about the braking force of the disc brake axle. If the owner is really worried, it can be used with a hydraulic retarder. This is also the best solution for installing a disc brake axle on a semi-trailer. The hydraulic retarder is light in weight, large in braking torque, soft and stable in braking output, and can avoid thermal fading under long-term high-power braking. Reduce the wear of brake components and reduce the overall cost of vehicles. If it is combined with ABS or EBS system on this basis, it can overtake the drum brake bridge, allowing the trailer to stop smoothly in the shortest braking distance.

In addition, disc brake axles are more resistant to thermal fading than drum trailer axles. According to the comparison of experimental data, the temperature of drum brakes reaches above 300 degrees, and the friction coefficient drops by 40%-50%. In contrast, when the temperature of disc brake bridges rises from 100 degrees to 400 degrees, the friction coefficient hardly changes.

When the vehicle is wading, the disc brake bridge only needs 1-2 times of braking, and the performance can be restored, but the drum brake bridge needs more than a dozen consecutive braking performances to recover. Not to mention the dynamic effect, it is also easy to cause problems such as wheel lock and brake rust.

To sum up, it is no problem for the disc brake axle to be used on the rear axle of the semi-trailer. However, the actual application situation is much more complicated than the theory, and there are more factors to be considered. Therefore, whether the disc brake axle can provide reliable performance guarantee for the semi-trailer still needs to be determined by the actual situation.

The first is the quality of the disc brake bridge. If the quality of the product itself is not up to standard or even shoddy, it will not only fail to provide protection for the vehicle, but will even endanger driving safety in turn. It is recommended that car owners should not blindly choose cheap cars, but try to choose products that have been in the market for a long time and have been fully tested by the market;

The second is to use the right working conditions, "A's honey and second's arsenic", the best product is the one that suits your working conditions. Generally speaking, in addition to the three-axis fence and warehouse grid clearly stipulated in the regulations, precision instrument transportation, fragile goods transportation, hazardous chemicals transportation, green transportation, valuables transportation, etc. In other cases, you can choose disc brake axles. As for those who often run heavy loads and do not have such high requirements for cargo damage, it is recommended to use drum brake bridges;

The last thing is to use it in accordance with the regulations. "People are not enough to swallow elephants." The choice of trailer axles needs to match the tonnage. If the owner often transports illegally, overloads, or exceeds the limit, then don't talk about disc brake bridges, even if they are famous for their high load-bearing capacity. The American-style drum brake bridge, under long-term overload use, I am afraid that the performance is difficult to guarantee. Therefore, it is necessary to divide the transportation, and only by being careful can the ship of ten thousand years be sailed.