Why does a semi trailer break its shaft?

The event of broken axle of the car has been noisy for a period of time. Many owners are terrified of this extreme quality problem, lest they also encounter it. Semi trailer as a heavy duty model in the logistics transportation industry, will there also be a broken shaft this serious problem? The answer is yes, semi-trailers can also break shafts.

So what is a "broken axis"? Under normal circumstances, the probability of the axle breaking directly from the middle is very small. The so-called "broken axle" widely refers to the shaft head breaking or the parts connecting the wheel, the wheel rim assembly or the suspension loosening, breaking, deformation and so on.

Broken axle is a very dangerous situation, especially when the vehicle is flying at high speed. Once broken axle occurs, it is easy to cause the wheel to fly out, the vehicle to lose control or the chassis to lose support. Car crash and death are not exaggerated at all.

A good vehicle, why will there be a broken shaft? The reasons can be divided into two aspects:

1. External factors:

(1) Side collision: After a general vehicle collision, there is a high probability of broken axle. The reason is that the collision force has exceeded the range of bearing capacity of the axle or suspension. For example, the impact or extrusion of the side or rear side hardly requires too much strength to lead to broken axle.

(2) Turning: if the vehicle turns too fast, the outside tire may hit the curb or the guardrail, causing the broken shaft.

(3) Encounter potholes or low obstacles: for example, encounter a big pit on the road, or meet the upper limit wide pier, if the speed is fast, the impact force to the chassis system is very large, easy to lead to broken shaft.

(4) Overload: for transport vehicles, overload is a very common factor leading to shaft breakage. Beyond the limit of vehicle load, chassis parts bear too much pressure, which is also prone to shaft breakage.

2. Internal factors:

(1) The material is not up to standard: the material of the axle is generally selected alloy steel with qualified strength. If the manufacturer covets cheap raw materials and uses poor materials, it is easy to break the axle.

(2) Unqualified process: in the case of selecting the right raw materials, if the treatment process is unreasonable or substandard, the performance of steel can not be fully played, but also easy to affect the use of.

(3) There are problems in the structural design: for the trailer axle, trailer suspension, which has higher requirements on the bearing capacity of the parts, generally need to go through a strict and professional design, if the structure is unreasonable, it is easy to fracture in the case of stress concentration.

(4) Old scars: that is, we often say fatigue fracture, that is, the axle may have no problem in quality, but in the long time of use, there are some old scars, if not timely maintenance or update, it may eventually lead to broken shaft.

(5) Manufacturing defects: there are many parts of the vehicle chassis. If there are shrinkage holes and sand holes on the parts, it is likely that the thick line will break without external force.

It can be seen that there is more than one reason for the phenomenon of broken shaft. The quality problem of the parts themselves is on the one hand, and the daily use habits of the owners is on the other.

Some owners ask: After the trailer shaft is broken, can it be repaired and continued to use?

If you go to a repair shop and ask, the answer is yes, it's broken, it's soldered, it's still working. However, to be honest, it is not recommended that the owners of the broken shaft repair after reuse. Why? The damaged axle is repaired with ordinary technology, only for the restoration of the surface. The damaged internal structure cannot be repaired, and the load capacity is certainly not as good as that of the intact axle. How can we ensure that there will be no more problems in the subsequent use? Rather than waste time and money on a piece of junk and take the risk of using it, it is better to pay for a new piece and install it.

Now there are not only finished trailer axles on the market, such as optical shaft, bearings, hubs and other semi-finished axles or parts are sold, the price is affordable, the quality is much better than the repaired shaft body, such as DARO Heavy Industry Group production of American and German optical shaft, the average price is about 900-1000 yuan, directly buy a replacement, and reliable, and worry.

In addition, the owner at the beginning of the choice of axle or suspension, to do a good job of identification, although for raw materials and other issues, non-professionals can not use the naked eye to identify, but can start from the production process, production scale and other aspects, if there are conditions, it is best to carry out field inspection of the manufacturer.

DARO Heavy Industry Group is a commercial vehicle axle and parts research and development manufacturer, founded in 2001, has more than 20 years of history, headquartered in Liangshan, Shandong Province, has a high standard production workshop, from the start of cutting, to the completion of assembly, to quality inspection and performance testing, unified implementation of IATF16949 quality system standards. The DARO trailer axle uses a "one-piece" axle instead of the traditional "three-piece" welded axle body. The shaft body and shaft head are created from a steel pipe, which eliminates the welding and connection process, avoids thermal deformation and improves the robustness and durability of the shaft head. For the connecting part of the bearing, intermediate frequency induction strengthening treatment is added to enhance the strength of the shaft head and ensure the heavy load and stability of the shaft head under high-speed operation. Fifteen production processes, covering 1300℃ hot rolling, 865℃ intermediate frequency quenching, 480℃ thermal insulation treatment, fully stimulate the comprehensive mechanical properties of raw materials, improve strength, toughness, elongation and durability, ensure the bending, torsional and fatigue resistance of finished products, over the years with stable and reliable quality and affordable price, With many trailer enterprises, logistics companies, transport fleet and retail to establish a good relationship of cooperation.