Semi trailer axle refers to the axle installed on the semi-trailer bucket. Generally, it belongs to the support axle, which has neither steering function nor driving function, and is specially used to bear the weight of the vehicle body. For semi-trailer, the axle is one of the key conditions to determine its load-bearing performance. At the same time, it also undertakes the functions of ensuring braking, buffering bumps, maintaining driving and so on.

In terms of appearance, the middle of the semi-trailer axle is an integral axle beam, the upper part is connected with the vehicle body through the suspension system, and the wheel end systems on both sides are used to install the wheels. However, as a precision mechanical component on the semi-trailer, the components of the axle are still very complex. Each unit is linked and complementary to ensure the comprehensive performance of the axle.

In order to ensure the attendance, safety and economic benefits of semi-trailer, it is very important to choose a high-quality axle, especially under the severe driving conditions such as many mountain roads, rugged terrain and many curves, it puts forward strict requirements for the performance of the axle.

In general, regardless of the tonnage and model, the common axles on the semi-trailer are mainly divided into the following types:

1. Drum axle.

Drum axle is the most widely used type of axle on semi-trailer, and it also accounts for the highest proportion in the market.

Compared with other axles, the most obvious advantage of drum axle is that the price is relatively low, the accessories are basically common in the industry, the design is simple, and the subsequent maintenance and replacement are more convenient.

In terms of braking performance, the drum axle is equipped with a sealed brake drum with large braking friction area, which can provide more sufficient braking force for semi-trailer, especially heavy semi-trailer.

Therefore, drum axle can be widely used in all kinds of general cargo transportation, such as sand and stone, steel coil, wood, coal and other heavy cargo transportation.

2. Disc axle.

In recent years, the application of disc axle in semi-trailer is more and more. On the one hand, it benefits from the promotion of relevant policies, on the other hand, it is also closely related to its own advantages.

The disc axle uses the exposed brake disc instead of the sealed brake drum, and the heat dissipation, heat attenuation resistance and water attenuation resistance have been greatly improved.

In addition, the disc axle optimizes the brake transmission components. After stepping on the brake, the brake pads can be driven immediately. The braking reaction speed is fast, the linear stability is strong, and the braking is more stable.

Especially when it is used with ABS, EBS, hydraulic retarder, air suspension and other devices, the advantages of disc brake have been brought into play to a greater extent.

In the field of application, in addition to the three-axis fence semi-trailer mandated by the state, those transportation conditions with high requirements for cargo damage, such as dangerous goods transportation, precision instrument transportation, valuables transportation, flowers, fruits and vegetables transportation, are more suitable for disc axles.

It is worth noting that in those mountain road transportation with poor road conditions, if the disc brake is combined with auxiliary braking devices such as hydraulic buffer, the braking effect is often better than that of drum axle.

3. Low flat axle.

Low flat axle is a special axle for low flat semi-trailer, such as 13.5 large flat car. According to the requirements of laws and regulations, large trucks can only be used to transport large goods that cannot be disassembled. Ordinary goods are not allowed to be transported. One is unsafe and the other is not conducive to the good development of the freight market.

Compared with other vehicle bridges, the low flat car bridge has lower height and higher wall thickness, which can not only facilitate the loading and unloading of goods, facilitate the passage of height limited sections, improve the stability of transportation, but also carry higher weight. Transportation machinery and equipment, large tanks, construction equipment, power station equipment, etc. are not included. In addition, some sedan semi trailers are also suitable for low flat axle.

4. Three wire six axle axle.

The three line six axle axle axle is mainly used for the transportation of large or extra large goods. This kind of goods has a large volume and weight and is generally non detachable, requiring large or special vehicles for transportation. The three wire six axle axle axle is specially customized for large transport vehicles, with a load of up to 80t and a large number of tires, so as to reduce the average pressure on the contact surface and reduce the damage to tires and roads.

Of course, in addition to the above types, there are many kinds of semi-trailer bridges, such as single tire axle, double tire axle, built-in axle, external axle, special axle, concave axle, etc. the design structures are different, the characteristics are not used, and the applicable fields or working conditions are more or less different. The owners should fully consider the use needs when choosing.